INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2014
·Vol. 39
·期 28
·16179-16186
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IF 2.93
Hao Wang,Fengxiang Yin,Guoru Li,Biaohua Chen,Zhiqing Wang
A mixed metal–ion metal–organic framework (MOF(Fe/Co)) was synthesized by a hydrothermal process using ferric and cobalt salts as the metal–ion precursors and trimesic acid as the organic ligand. The structure of the as-prepared MOF(Fe/Co) was characterized by X-ray diffraction (XRD), N 2 adsorption–desorption, transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS) and thermogravimetry/differential thermogravimetry (TG/DTG). The bifunctional catalytic activities of MOF(Fe/Co) toward the oxygen evolution reaction (OER) and the oxygen reduction reaction (ORR) in alkaline electrolyte were investigated by cyclic voltammetry (CV) and linear sweep voltammetry (LSV). The results demonstrate that the as-prepared MOF(Fe/Co) has a good crystalline structure with abundant micropores , a high specific surface area and a high thermal stability. The MOF(Fe/Co) exhibits excellent bifunctional catalytic activities for OER and ORR. The high specific surface area and abundant micropores are beneficial for oxygen diffusion and catalytic sites utilization in the catalyst, which is favorable for the OER and ORR. The RDE results for MOF(Fe/Co)-catalyzed ORR indicate that the two-electron pathway was preferred at relatively positive potentials, whereas the four-electron pathway gradually dominated at more negative potentials.
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Journal of Energy Chemistry
·
2020
·
IF 7.216
Xiaojing Jiang,Jianian Chen,Fenglei Lyu,Chen Cheng,Qixuan Zhong,Xuchun Wang,Ayaz Mahsud,Liang Zhang,Qiao Zhang
Controllable fabrication of Fe-N-C based single-atom catalysts (SACs) for enhanced electrocatalytic performance is highly desirable but still challenging. Here, an in situ surface-confined strategy was demonstrated for the synthesis of single atomic Fe-N 4 on N-doped carbon nanoleaves (L-FeNC). The in situ generated Zn 3 [Fe(CN) 6 ] 2 could not only serve as a protection layer against collapse of nanoleaves but also provide abundant Fe source for the formation of Fe-N moieties during pyrolysis, leading to high surface area and high graphitization degree of L-FeNC simultaneously. Benefiting from abundant Fe-N 4 active sites, enhanced mass and charge transfer, the as-prepared L-FeNC manifested a half-wave potential of 0.89 V for oxygen reduction reaction (ORR) in 0.1 M KOH. A maximum power density of 140 mW cm −2 and stable discharge voltage even after operation for 50,000 s have been demonstrated when the L-FeNC was used as air cathode for Zn-air battery. This work not only provided a unique surface-confined strategy for the synthesis of two-dimensional nanocarbons, but also demonstrated the significant benefit from rational design and engineering of Fe-N-C SACs, thus offering great opportunities for fabrication of efficient energy conversion and storage devices.
研究领域:
材料科学
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电化学
·
能源存储与转换
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纳米科技
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催化化学
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2022
·
IF 5.518
Ying Ji,Honglei Liu,Yujiao Guo,Junming Guo,Mingwu Xiang,Wei Bai,Xiaofang Liu,Hongli Bai
At high current density, low capacity and rapid capacity decay of spinel LiMn 2 O 4 cathode material during the cycle limit its application. Herein, element doping approach to restrain Jahn-teller effect combined with crystal plane regulation to mitigate Mn dissolution is employed to synthesize a series of truncated octahedron LiNi 0.02 Fe x Mn 1.98−x O 4 (x ≤ 0.12) which provide high exposure {111} surfaces as well as a small portion of {110} and {100} facets for offering Li + ion rapid diffusion channel. Many characterizations such as XRD , SEM and TEM show that Ni-Fe co-doped can effectively promote the development of crystal and the preferential growth of crystals planes. Electrochemical test results imply that at 1 C the difference between capacity and capacity retention ratio in terms of LiNi 0.02 Mn 1.98 O 4 (LNMO) and Ni-Fe co-doping samples are not obvious. With the increasing of current densities, Ni-Fe co-doping samples exceptional rate capability and cycle stability become apparent. The optimal LiNi 0.02 Fe 0.05 Mn 1.93 O 4 (LNFMO-5) and LNMO can keep 76.9% and 74.6% of their original capacity of 113.4 mAh·g ‐1 as well as 116.2 mAh·g ‐1 after 500 cycles at 1 C, respectively. At 10 C, the LNFMO-5 sample delivers the capacity of 89.3 mAh·g ‐1 and a higher capacity retention ratio of 72.9% after 2000 cycles, while the LNMO sample is only 63 mAh·g ‐1 and 67.2%. Even at 20 C, The LNFMO-5 sample still reaches a high specific capacity of 84.9 mAh·g ‐1 and a higher capacity retention ratio of 76.1% after 2000 cycles, which are much higher than the LNMO sample (63.0 mAh·g ‐1 ) and 57.4% capacity retention rate. CV and EIS analysis manifest that the LNFMO-5 has a higher D Li + and a lower E a than that of the LNMO. A unique Ni-Fe co-doped truncated octahedral LiMn 2 O 4 material with exceptional electrochemical property will be an attractive candidate for the preparation high-performance and long-cycle spinel LiMn 2 O 4 cathode materials.
研究领域:
材料科学
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电化学
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储能技术
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锂离子电池
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正极材料
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2018
·Vol. 43
·期 32
·15358-15364
·
IF 4.229
Qiang Wu,Cheng Ji,Xiaohui Zhang,Qichang Pan,Jiujun Zhang,Qingyu Li,Hongqiang Wang
Core-shell Fe 3 O 4 @Fe nanoparticles embedded into porous N-doped carbon nanosheets was prepared by a facile method with NaCl as hard-template. The three-dimensional carbon architecture built by carbon nanosheets enhance the conductivity of the encapsulated Fe 3 O 4 @Fe nanoparticles and strengthen the structure stability suffering from volume expansion during extraction and insertion of lithium ions . Rich Pores enhance the surface between electrode and electrolyte, which short the transmission path of ions and electrons. The core-shell structure with Fe as core further improves charge transferring inside particles thus lead to high capacity. The as-prepared Fe 3 O 4 @Fe/NC composite displays an irreversible discharge capacity of 839 mAh g −1 at 1 A g −1 , long cycling life (722.2 mAh g −1 after 500th cycle at 2 A g −1 ) and excellent rate performance (1164.2 and 649.2 mAh g −1 at 1 and 20 A g −1 , respectively). The outstanding electrochemical performance of the Fe 3 O 4 @Fe/NC composite indicates its application potential as anode material for LIBs .
研究领域:
材料科学
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电化学
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储能
·
纳米材料
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Carbon Energy
·
2026
·
IF 24.2
Kaiming Li,Ben Huang,Aihao Xu,Kai Nie,Xianhai Bai,Qian Ning,Guodong Wang,Shiming Qiu,Huibing He,Yang Ren,Jing Xu,Xucai Yin
The inherent hydroxide-rich (OH⁻) environment in alkaline media facilitates the two-electron oxygen reduction reaction (2e − ORR). However, the strong interaction between alkali metal cations and solvated water molecules significantly reduces the connectivity of the hydrogen bond network within the alkaline electric double layer, thereby severely impeding rapid proton transport at the electrode surface. Herein, we rationally designed ZnO with oxygen vacancies-driven [Fe(CN) 6 ] 3− coordination (denoted as Fe(CN) 6 -ZnO-V O ) as an efficient 2e − ORR catalyst for H 2 O 2 electrosynthesis. We demonstrate that the locally coordinated [Fe(CN) 6 ] 3− establishes pathways for rapid proton transfer at the electrode surface by forming a hydrogen bond network with interfacial water molecules. Concurrently, this configuration significantly reduces the energy barrier of the *OOH intermediate. These synergistic effects collectively optimize the electrocatalytic performance for H 2 O 2 production under alkaline conditions. As expected, the Fe(CN) 6 -ZnO-V O delivers a significantly increased current density of 130 mA cm −2 that is much higher than ZnO (32 mA cm −2 ), as well as a superior H 2 O 2 production rate of 9.41 mol g cat −1 h −1 and a high faradaic efficiency of exceeds 90%. Our study highlights the crucial role of interfacial hydrogen-bonding connectivity and provides theoretical and technical guidance for developing reliable strategies to enhance the electrocatalytic properties of 2e − ORR.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2026
·
IF 21.1
Yuqing Feng,Hongxia Liu,Yongxing Shang,Yingsen Fang,Shumei Gao,Ping Sun,Bitao Xiong,Hui Wang,Hui Liu,Mingbao Feng
Single-atom catalysts (SACs) are an effective strategy for maximizing the efficiency and reducing the costs of advanced oxidation processes (AOPs). Herein, a novel SAC with Fe−N 3 C sites was synthesized for emerging periodate (PI)-based AOPs. The optimized catalyst demonstrates superior performance, achieving 100 % removal of diclofenac (DCF) within 20 min via predominant singlet oxygen ( 1 O 2 ). Compared to the Fe−N 4 configuration, the Fe−N 3 C site enables an unprecedented 152.9-fold increase in the pollutant degradation rate, surpassing most reported catalysts. Density functional theory (DFT) calculations reveal that the Fe−N 3 C sites reduce the oxophilicity of the Fe centers, thereby lowering the energy barrier for 1 O 2 desorption and promoting its preferential generation. The DCF degradation pathway was further elucidated by Fukui constants. Furthermore, the Fe−N 3 C/PI system exhibits excellent stability with negligible leaching of Fe ions and strong resistance to common wastewater components. This work provides new insights into the design of efficient SACs and the construction of PI-based AOPs for water decontamination.
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Environmental Science-Nano
·
2026
·
IF 5.1
Shiyi Tu,Wenpeng Li,Yangyang Xu,Li Gan,Xiulan Weng,Zuliang Chen
The increasing release of antimony (Sb) into water environments due to anthropogenic activities poses significant ecological risks. This study developed a novel hybrid material, zeolitic imidazolate framework-8-iron nanoparticles (ZIF-8-Fe NPs), which demonstrates a synergistic adsorption-oxidation mechanism for efficient removal of Sb(III) from aqueous solutions. Major findings reveal that at an initial Sb(III) concentration of 1 mg L-1, ZIF-8-Fe NPs achieved a 73.3% removal efficiency within three hours through the dual processes of direct adsorption and oxidation of Sb(III) to Sb(V). Scanning electron microscopy-energy dispersive spectrometry (SEM-EDS), Fourier transform infrared spectroscopy (FTIR), and X-ray photoelectron spectroscopy (XPS) revealed that the removal mechanism involved both direct adsorption of Sb(III) by ZIF-8-Fe NPs and oxidation of Sb(III) to Sb(V), with two distinct morphologies of Sb adsorbed on the surface. The formation of covalent bonds (Zn-OH-Sb and Fe-O-Sb) was identified as the key factor in removing both Sb(III) and Sb(V) from aqueous solutions. The adsorption process conformed to the Langmuir adsorption isotherm and pseudo-second-order kinetics, with correlation coefficients (R²) of 0.959 and 0.999, respectively. The proposed mechanism suggests that the formation of Zn-OH-Sb and Fe-O-Sb covalent bonds plays a crucial role in Sb(III) removal. Significantly, ZIF-8-Fe NPs achieved removal efficiencies of 91.5% and 94.8% for Sb(III) at environmentally relevant concentrations of 100 µg L-1 and 20 µg L-1, in actual mining wastewater, demonstrating its practical applicability. This study establishes that ZIF-8-Fe NPs constitute an effective nanomaterial with significant potential for Sb(III) remediation in wastewater.
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Journal of Cleaner Production
·
2026
·
IF 10.7
Lei Liu,Shanshan Shao,Xiaohua Li,Shiliang Wu
This study developed a green and integrated hydrothermal liquefaction process for efficiently converting cellulosic materials into ketone-based aviation fuel precursors. To address issues such as low hydrolysis efficiency and weak catalytic activity during biomass hydrothermal conversion, dielectric barrier discharge non-thermal plasma pretreatment was employed, combined with an Fe/NaHCO 3 synergistic catalytic system to regulate the reaction microenvironment and enhance product selectivity. First, plasma pretreatment utilizes high-energy electrons and active particles to disrupt the crystalline regions and hydrogen bonding network of cellulose, significantly reducing its crystallinity and exposing more reactive hydroxyl sites, thereby improving the hydrolysis and conversion efficiency of cellulose under hydrothermal conditions. Experimental results showed that after DNTP pretreatment at 12 kV for 15 min, the relative peak area of ketone products from cellulose increased by 28.2% compared to the untreated sample under hydrothermal conditions of 260 °C for 30 min. Furthermore, the introduction of NaHCO 3 together with Fe formed a synergistic catalytic system. The alkalinity of NaHCO 3 effectively neutralizes organic acids generated during liquefaction, eliminating H + poisoning of Fe active sites, while promoting the conversion of Fe into highly active Fe 3 O 4 and enhancing the Fe 3+ /Fe 2+ redox cycle. This suppresses intermediate condensation and coking, thereby improving the selectivity and carbon efficiency of ketone synthesis. Using holocellulose derived from rapeseed straw as feedstock, a ketone selectivity of 60.7% was achieved at an Fe-NaHCO 3 mixing ratio of 1:1. This process is characterized by its green nature, high efficiency, and ease of catalyst recovery, offering a promising technological pathway for the production of sustainable aviation fuels from biomass.
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CHEMICAL ENGINEERING JOURNAL
·
2026
·
IF 12.5
Xiaoqiang Li,Xiaorui Zhang,Xin Zhang,Shengjun Wen,Xiaoxiao Duan,Yongsheng Ren
2-Mercaptobenzothiazole (MBT), a highly toxic industrial corrosion inhibitor containing a thiol group, poses severe threats to ecological and human health. In this study, a trimetallic cathode (FeCoMn@LNC-500) was fabricated by in situ growing oxygen-vacancy-rich FeCoMn-LDHs on carbon paper followed by carbonization at 500 °C. FeCoMn@LNC-500 exhibited a cylindrical fiber-rod structure decorated with numerous densely aggregated spherical particles, which increased the electrochemical active surface area and reduced the charge-transfer resistance. Under optimal conditions, FeCoMn@LNC-500/EF achieves a degradation rate of 100% within 70 min through singlet oxygen ( 1 O₂) mediated non-radical oxidation (k = 0.0557 min −1 ). The removal efficiency achieved with this cathode was approximately 11.8, 5.0, 2.0, and 3.2 times higher than those of the PC-500, FeMn@LNC-500, CoMn@LNC-500, and CoFe@LNC-500 cathode systems, respectively. The outstanding degradation performance is primarily attributed to the carbon paper's excellent conductivity, which enhances the in-situ synergistic cycling of Co, Fe, and Mn to accelerate the Fenton reaction while also improving system stability, as demonstrated by a 7-cycle operational test and the detection of extremely low metal-ion leaching. Quenching experiments and electron paramagnetic resonance (EPR) spectroscopy confirmed that the non-radical 1 O₂ played a dominant role in the oxidation process. HPLC-MS analysis revealed the degradation mechanism and pathway of MBT: non-radical-dominated selective cleavage of the S N bond followed by stepwise mineralization. The carbon-paper-based cathode developed in this work provides insights into the electro-Fenton degradation of thiol-containing wastewater and is expected to offer a new strategy for the efficient treatment of coal-chemical pipeline wastewater.
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JOURNAL OF NANOPARTICLE RESEARCH
·
2026
·Vol. 28
·期 3
·82
·
IF 3.5
Zhao Xu,Guo Hongyan,Zhang Nannan,Yue Zhi,Gu Xungang
A novel dual Z-scheme BiOBr/NH 2 -MIL-101(Fe)/g-C 3 N 4 (BNG) heterojunction was constructed via a simple two-step solvothermal process. NH 2 -MIL-101(Fe) nanoparticles and BiOBr microspheres were uniformly deposited on the surface of g-C 3 N 4 . The prepared BNG exhibited significantly enhanced photocatalytic performance for tetracycline (TC) degradation compared to single catalyst. The optimized BNG-19 composite (with 19% NH 2 -MIL-101(Fe)/g-C 3 N 4 ) achieved 92.38% degradation of TC within 75 min under visible light, which was 2.47, 1.78, and 1.84 times higher than that of pure g-C 3 N 4 , NH 2 -MIL-101(Fe), and BiOBr, respectively. Moreover, the composite exhibited excellent stability with 82.4% removal efficiency after five cycles. The enhanced photocatalytic performance was attributed to the synergistic dual Z-scheme charge transfer mechanism, which was directly evidenced by in-situ irradiated XPS showing opposite directional shifts of Bi 4f (positive) and Fe 2p/N 1s (negative). This unique charge transfer pathway effectively promoted the separation of photogenerated carriers, with •OH and •O 2 ⁻ identified as the dominant reactive species. This work provides a new strategy for constructing g-C 3 N 4 -based dual Z-scheme heterostructures with direct mechanistic evidence for efficient environmental remediation.
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ChemCatChem
·
2026
·Vol. 18
·期 12
·e70865
·
IF 4.1
Yacong Yang,YaKun Qu,Zhixiong Yang,Yu Wu,Xiaoguang Zhao,Haibo Yin,Yuning Huo,Zongli Xie
Photocatalytic reduction of nitrate (NO 3 − ) to ammonia (NH 3 ) has garnered growing attention as a sustainable route for simultaneous nitrate pollution remediation and value-added ammonia synthesis under ambient conditions. However, its efficiency remains severely limited by the intrinsically high structural stability of nitrate anions and inefficient charge-carrier utilization. In this study, a Fe-doped Bi/Bi 2 WO 6 photocatalyst (H-Fe-B/BWO) is constructed via a facile hydrothermal method followed by calcination in a reducing atmosphere. The experimental results reveal that the optimized H-Fe-B/BWO exhibits significantly enhanced photocatalytic nitrate reduction performance, achieving an NH 3 production rate of 2.419 mmol g cat −1 h −1 with a high selectivity of 99.3% in the presence of ethylene glycol (EG), representing an approximately 4.5-fold improvement compared with pristine Bi 2 WO 6 . The remarkable enhancement originates from the synergistic effect between Lewis acidic sites generated by Fe dopants with unsaturated coordination environments and the surface plasmon resonance of metallic Bi, which collectively facilitates nitrate activation and improves charge-carrier separation and utilization. This work provides a rational strategy for designing efficient photocatalysts for selective NO 3 − -to-NH 3 conversion under environmentally benign conditions, contributing to sustainable nitrogen management and circular economy-driven resource recovery. Graphical The enhanced photocatalytic nitrate-to-ammonia conversion over H-Fe-B/BWO can be summarized as a cooperative process involving surface reaction chemistry and charge-carrier dynamics. Fe dopants introduced into the Bi 2 WO 6 lattice generate coordinatively unsaturated metal centers, which function as Lewis acidic sites capable of strongly interacting with nitrate anions through O-metal coordination. This interaction promotes nitrate adsorption and induces structural distortion of the NO 3 − species, thereby lowering the activation barrier for the initial N─O bond cleavage. Simultaneously, reductive calcination leads to the in situ formation of metallic Bi on the catalyst surface, which serves as a plasmonic component under visible light irradiation. The surface plasmon resonance of metallic Bi not only broadens the light-harvesting capability but also enhances local electromagnetic fields, facilitating the separation and migration of photogenerated charge carriers. As a result, photogenerated electrons are more efficiently delivered to nitrate species adsorbed at Lewis acidic sites, enabling a sustained multi-electron reduction pathway toward ammonia while suppressing competing reactions. The intimate coupling between nitrate activation at Fe-derived Lewis acidic sites and plasmon-induced charge utilization accounts for the high activity and selectivity observed over the H-Fe-B/BWO photocatalyst.
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Catalysts
·
2026
·Vol. 16
·期 5
·479
·
IF 4.5
Shaomeng Huang,Feijian Jing,Liping Wang,Yiqing Xu,Jiawen Sheng,Qiongqiong He
The lithium battery recycling industry is developing rapidly, and the rapid oxidation and degradation of dimethyl carbonate (DMC) in the wastewater generated by this industry is of crucial importance. In this study, Fe and Cu dopants were controlled and the C-SiO2framework with porous structures was constructed to synthesize FeCuC-SiO2and C-SiO2catalysts. The former could achieve 91.65% of DMC degradation within 60 min through peroxymonosulfate (PMS) activation, and the degradation rate was increased to 4.44 times compared to C-SiO2without Fe and Cu doping. And under optimized conditions, a DMC degradation rate of 90.57% can be achieved within 10 min by FeCuC-SiO2. The catalyst has good stability and the catalytic activity can be maintained during reuse process for five times with over 70% of DMC degradation rate, 58.9% of mineralization rate, and a relatively low amount of metal leaching. Moreover, the degradation rate can still remain above 70% with the existence of impurity anions, demonstrating a strong salt resistance. Hydroxyl radicals (OH•), sulfate radicals (SO4•−), and1O2were found to dominant the reaction in the FeCuC-SiO2-PMS system, which were involved in both free radical and non-free radical pathways and led to excellent catalytic oxidation performance and environmental adaptability. In general, a novel design for a Fenton-like catalyst was presented, providing a theoretical basis for the improvement of oxidation efficiency and the regulation of reaction pathways in Fenton-like reactions.
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