APPLIED SURFACE SCIENCE
·
2021
·
IF 6.707
Mengmeng Yang,Qingquan Kong,Wei Feng,Weitang Yao,Qingyuan Wang
Due to its relatively high theoretical capacity and low cost, transition metal oxides are considered as candidate anodes for potassium ion batteries (KIB). However, poor recyclability due to inherently large volume changes hinders their application. Therefore, we use Ganoderma spores as the carbon matrix to synthesize MoO 2 /N/C composites through simple complexation reactions. It was found that the synergistic effect of cage-like biomass carbon and molybdenum oxide can promote the transfer and adsorption of potassium ions, thereby improving the storage capacity of potassium ions. On the one hand, the introduction of a small amount of MoO 2 greatly enhances the potassium storage capacity of biomass carbon materials. On the other hand, the porous cage-like carbon structure effectively buffers the volume change during the MoO 2 potassium storage process and provides more diffusion paths for K + . In addition, the stable double-walled cage structure provides the possibility for the composite material to achieve good long-cycle performance. Specifically, MoO 2 /N/C composites provided a high reversible specific capacity of 422 mAh g −1 (after 200 cycles) at 200 mA g −1 , and coulombic efficiency was greater than 98%. The composites still provided a high capacity of 316 mAh g −1 after 500 cycles at 500 mA g −1 . At the same time, after 1500 cycles at 2000 mA g −1 , the capacity was maintained at 248 mAh g −1 . Verify the possibility of its practical application by assembling a full battery, meanwhile, through first-principles calculations, the reasons for the excellent potassium storage performance of MoO 2 /N/C electrodes are discussed.
研究领域:
材料科学
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电化学
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能源存储
✓ 已验证
产品关联
DOI
高影响因子
ACS Catalysis
·
2022
·
IF 13.7
Xuliang Lin,Xing Fei,Dalang Chen,Yi Qi,Quanzhou Xu,Yinchun Liu,Qian Zhang,Sha Li,Tiejun Wang,Yanlin Qin,Xueqing Qiu
The conversion of renewable bioethanol into high-energy-density higher alcohols has become essential for meeting the increasing global demand to achieve carbon neutrality. In this study, Zn- and nitrogen-codoped Ni-based lignin-derived carbon catalysts (NiZn@NC) were prepared by solvent volatile self-assembly and in situ reductive carbonization using pulp and paper waste stream alkali lignin as the carbon source. Lignin amphipathic derivatives with −COOH and −NH2 groups would coordinate with metal ions to form a stable lignin–metal framework; thus, the lignin-derived carbon layer disperses the NiZn bimetallic catalyst and prevents from corroding. At an amination reagent/lignin mass ratio of 1:2, an ethanol conversion of 75.2% and a high alcohol yield of 41.7% were achieved over the Ni20Zn1@NC catalyst. Experimental results and density functional theory calculations showed that Zn doping improved the electronic environment and defect structures of metallic Ni and carbon carrier, which effectively inhibited C–C cleavage and suppressed the byproduct formation, such as methane. Thereby, the synergetic effect between Ni and Zn facilitated the efficient conversion of aqueous ethanol into higher alcohols by the Guerbet reaction. This work provides a strategy of in situ pyrolytic doping and stabilizing of renewable biomass macromolecules as the frameworks for the construction of highly active and cost-efficient catalysts for ethanol upgrading.
研究领域:
催化化学
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可再生资源利用
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材料科学
✓ 已验证
DOI
高影响因子
RSC Advances
·
2025
·Vol. 15
·期 33
·26950-26958
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IF 4.6
Chunqiu Zhao,Qiang Chang,Fu Yin,Jing Li,Guowei Niu,Hulin Wang,Dan Liu,Bhekie B. Mamba,Chenghua Zhang,Alex T. Kuvarega
One-step CO hydrogenation to value-added chemicals represents a prominent yet challenging research objective for conventional catalysis processes in chemical industry. Herein, we report a rationally designed Ni-doped Zn-NC catalyst embedded within an N-doped carbon matrix for one-step CO hydrogenation to dimethyl ether (DME), demonstrating superior CO conversion compared to the pristine Zn-NC catalyst (25.9% vs. 20.6%) while both maintaining high DME selectivity (>93%). Structural characterization revealed that Ni atoms existed in a bimetallic coordination environment, which is crucial for the promoting effect of Ni. In contrast, Ni nanoparticles incorporated into Zn-NC (nanoNi–Zn-NC) reduced CO conversion to less than 17% despite retaining high DME selectivity (>92%). Besides, control catalysts containing either Ni-only or Ni/Zn nanoparticles supported on carbon support exhibited limited catalytic activity and mainly produced hydrocarbons. This work provides valuable insights into the active sites of the bimetallic Ni–Zn-NC catalysts and elucidate the structural effects of bimetallic systems for CO conversion to DME. Furthermore, this study offers a feasible framework for optimizing Zn-based bimetallic catalysts.
研究领域:
催化化学
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化学工程
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材料科学
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能量转换
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Molecular Catalysis
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2024
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IF 3.9
Siyi Pu,Lu Sun,Chunyan Yang,Jie Chu,Ying Wang,Chungang Min,Xiaoqin Zou,Changfu Zhuang
The low-cost Cu-based catalysts have excellent selectivity in biomass hydrogenation, but it is challenging to improve their catalytic activity at low temperature. Herein, the trimetallic Cu x CoZn@NC (where x = 0.1, 0.3, 0.5 mmol is the molar mass of Cu) were prepared by in suit pyrolysis using trimesic acid with stronger coordination ability. When it was applied to the furfural (FF) selective hydrogenation process, the catalytic yield of the optimal Cu 0.3 CoZn@NC reached >99 % under mild condition of 90 °C, which was 29 times superior to that of the CoZn@NC without Cu doping. The results demonstrate that the doping of Cu reduces the activation energy of Cu x CoZn@NC and increases the catalytic activity at low temperature relative to CoZn@NC. The characterizations and density functional theory (DFT) calculations show that the incorporation of suitable Cu content enhances the interaction between Cu and Co. The amount of surface-active Co 0 and the electron density are significantly enhanced, which effectively stimulates the dissociation of hydrogen. Moreover, the Lewis acid content is significantly increased to facilitate the adsorption and activation of FF. Meanwhile, the impact of Cu content variation on the performance of the multi-metal catalyst is discussed. This work is promising to establish a foundation for the accurate design of polymetallic catalysts through adjusting the Cu content to regulate the reaction activity and selectivity.
研究领域:
催化化学
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材料科学
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理论计算
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2021
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IF 7.46
Runmin Huang,Dan Liao,Zhenhua Liu,Jingang Yu,Xinyu Jiang
Construction of high-sensitive analytical platform to monitor organic pollutants in the environment is of significance. Nitrophenol is toxic organic pollutant, causing serious damage to biosphere. Herein, a simple self-assembled method was proposed to design a novel heterostructure (MXene/ ZIF) composed of Nb 2 CT X and Zn-Co-ZIFs derived bimetallic Zn, Co embedded N-doped carbon (Zn-Co-NC) nanocage. The Nb 2 CT X / Zn-Co-NC composite modified electrodes were applied for the electrochemical detection of 4-nitrophenols (4-NP). SEM images revealed that the insertion of Zn-Co-NC can effectively avoid Nb 2 CTx from restacking. EDS and XPS demonstrated the successful synthesis of bimetallic Zn, Co embedded N-doped carbon nanocage. Excellent conductivity and large specific surface area of Nb 2 CTx as well as superior catalytic activity of Zn-Co-NC nanocage enhance the electrochemical performance of Nb 2 CTx/ Zn-Co-NC sensor. Under optimal conditions, the achieved wide linear range was 1 μM to 500 μM. The low detection limit of 0.070 μM with high sensitivity of 4.65 μA μM −1 cm -2 was obtained. Furthermore, the Nb 2 CTx/ Zn-Co-NC sensor holds outstanding selectivity and stability. Therefore, the innovative structure and excellent properties of MXene/ ZIF make them alternative materials for various electrochemical sensors for the detection of other toxic organic pollutants.
研究领域:
环境科学
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材料科学
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分析化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2022
·Vol. 10
·期 8
·4110-4119
·
IF 14.511
Da Liu,Wenkai Fang,Jiangtao Li,Liling Zhang,Mei Yan,Hongwu Tang
In general, enrichment of a higher number of exoelectrogens implies higher power density. However, the low electrocatalytic activity of anodes limits the performance of microbial fuel cells. Here, based on this consideration, we designed and fabricated an anode by integrating the 3D hierarchical architecture and excellent electrocatalytic activity of MoO2/MoC@NC nanodendrites grown on carbon fiber cloth. The as-designed MoO2/MoC@NC-CC electrode exhibits a relatively large specific areal capacitance of 710.21 F m−2 and a charge transfer resistance of only 5.29 Ω, which are 46.9 times higher and 67.9 times lower than those of the bare carbon cloth (CC) anode respectively, providing abundant electroactive sites for the colonization of exoelectrogens and accelerating the rate of extracellular electron transfer. At the same time, there was a positive correlation between the enrichment amount of Geobacter and the power density, demonstrating the successful preparation of the desired electrode. In addition, the branched-lily-like architecture of the MoO2/MoC@NC-CC anode exhibits super hydrophilicity and open 3D structure, facilitating microbial attachment, colonization, proliferation and diffusion of the internal culture matrix, thus shortening the start-up time and improving the long-term stable current output. Consequently, the MoO2/MoC@NC-CC anode achieved the maximum power density of 2.93 W m−2, which is improved by 70.3% compared to that of the bare CC, and is also the best among the reported Mo-based nanomaterial modified electrodes. This work presents valuable insights for the design and fabrication of high performance anodes for MFCs.
研究领域:
能源材料
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环境工程
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电化学
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2020
·
IF 6.215
Yu Wang,Guoxin Zhang,Mang Ma,Yiyan Wang,Ying Zhang,Xiaoming Sun,Zifeng Yan
Solid-phase templates are commonly used for building hollow-structured carbon materials (CMs) but often demand post treatments to remove templates. Herein, we develop an efficient and general method to construct hollow carbonaceous structure via the templating of sacrificial carbon nitride (termed as f-NC) without post treatment. The f-NC template can be decomposed under high-temperature annealing, additionally, it can serve as N source to enrich the N content. Applying f-NC template, we manage the synthesis of hollow-structured highly dispersed binary FeCo-nitrogen-carbon material (termed as f-NC@FeCo-NC). Its hollow feature is confirmed by direct observation using HRTEM . Meanwhile, Fe/Co in oxidation states have been verified uniformly distributing in heavily N-doped CMs (N content ∼ 13.2 at.%). The resulted f-NC@FeCo-NC, as examined by electrochemical measurements, exhibits highly efficient performance toward oxygen reduction reaction (ORR) in alkaline medium. It respectively shows much enhanced onset and half-wave potentials of 1.01 and 0.89 V relative to the FeCo-NC that is obtained without f-NC, in contrast, 20 wt% Pt/C shows 0.95 V onset potential and 0.83 V half-wave potential. The f-NC@FeCo-NC catalyst also shows excellent Al-air battery performance when applied as cathode, which possesses a high open circuit voltage of 1.91 V and a high peak power density of 241 mW cm −2 . We believe this sacrificial f-NC can be applied as general template for the fabrication of other hollow-structured carbon-based materials for broad electrochemical applications.
研究领域:
材料科学
·
电化学
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能源科学
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2020
·
IF 6.215
Cong Geng,Yahong Xie,Peng Wei,Haichao Liu,Yue Qiang,Yi Zhang
Hole transporting material (HTM)-free carbon-based perovskite solar cells (C-PSCs) have been regarded as one of the most promising solar cell systems owing to their superior long-term stability and low cost. However, using commercial conductive carbon (CC) paste to prepare carbon electrode (CE) usually leads to a large number of defects at the perovskite/CE interface, often resulting in a low fill factor (FF) and poor photoelectric conversion efficiency (PCE). In this paper, by pyrolyzing ZIF-67 and etching with HCl, the Co-NC(HCl) composite with a large specific surface area are prepared. Combining this material with CC paste in different proportions, a series of HTM-free PSCs structured as FTO/SnO 2 /perovskite/CE are fabricated. Our experimental results demonstrate that the incorporation of Co-NC(HCl) composite efficiently improves interface performance of perovskite/CE, suppresses charge recombination and promotes hole extraction, consequently enhancing the photovoltaic performance of the C-PSC. In particular, the maximum PCE of 10.72% has been achieved in the ambient atmosphere, achieving 43% increasing over the pure CC-based device. The improved performance can be attributed to the significant effect of morphological structure of Co-NC(HCl) composite and the synergistic effect of Co-N co-doping on the performance of C-PSCs.
研究领域:
材料科学
·
能源技术
✓ 已验证
产品关联
DOI
高影响因子
Materials Today Chemistry
·
2022
·
IF 7.613
W. Li,M. Gan,L. Ma,W. Zhao,W. Zhan,S. Deng,F. Xie
A highly active and stable anode catalyst for direct methanol fuel cells is critical to commercialization. Therefore, we have synthesized a unique Fe-doped catalyst Fe–PtBi 2 /Bi 2 O 2 CO 3 -NC through the classical hydrothermal method and sodium borohydride reduction. Physical characterizations confirm the existence of Bi 2 O 2 CO 3 nanosheets and successful loading of PtBi nanocages. It is the alternating layer arrangement of Bi 2 O 2 CO 3 , the bifunctional mechanism of PtBi alloy and the synergistic effect of each component that make the synthesized Fe–PtBi 2 /Bi 2 O 2 CO 3 -NC possess such remarkable methanol oxidation reaction activity (a mass activity of 9345 mA/mg Pt in alkaline electrolyte). Moreover, electrochemical measurements also indicate that 51.7% of the mass activity was retained after 1 h durable operation, which is approximately 4.1 times than that of commercial Pt black. Fe–PtBi 2 /Bi 2 O 2 CO 3 -NC may be applied as a promising alkaline anode catalyst for direct methanol fuel cells due to its outstanding structure and performance. The specific work provides a reference for designing reliable structures and selection of doping elements to enhance the sluggish kinetics of methanol electrooxidation.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
Ailing Pan,Xiaohui Sun,Yuanyuan Che,Yu Wang,Hong Du
COFs (covalent-organic frameworks) are regarded as ideal photocatalyst for hydrogen-evolution, due to their structural controllability, but they possess poor electrical conductivity and high exciton binding energy, which limits their photocatalytic activity. Here, the NiCo-ZIF-67 derived NiCo-nitrogen-doped carbon (NiCo-NC) with superior conductivity and high light-absorption capacity was spatially confined in the channels of TP-BD COF (TP: 2, 4, 6-triformylphloroglucino; BD: 4, 4′-biphenylenediamin) by constructing hydrogen bonds to form NiCo-NC@TP-BD COF core@shell heterojunctions and NiCo-NC acts as internal highly active nanoreactor, which could accelerate the photocatalytic efficiency. Specifically, the optimal catalyst [email protected] (NT-0.6) exhibits the maximum H 2 evolution rate of 78.97mmol g −1 h −1 without Pt cocatalyst, which is approximately 395 times higher than that of bare TP-BD COF. Systematic investigations imply that the NiCo-NC as a high active nanoreactor was stably encapsulated in the pore of TP-BD by hydrogen bonds and formed a close interfacial contact, which is revealed by Fourier-transform infrared spectroscopy (FT-IR) and proton nuclear magnetic resonance ( 1 H NMR). Meanwhile, the charge transfer and Hydrogen Evolution Reaction (HER) are revealed by the density functional theory (DFT) calculation. This work offers a promising strategy to reduce the high excitation binding energy of COFs-based catalysts in photocatalytic H 2 evolution.
研究领域:
材料科学
·
化学工程
·
能源科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Huihua Wang,Jinhong Wu,Siwei Guo,Haosen Chen,Ruiqi Guo,Ding Huan,Deyong Wang,Wenchang Li,Xianglong Li,Dong Hou
Engineering interface, regulating morphology, and doping heteroatoms are regarded as effective strategies for boosting the electrocatalytic performances of transition-metal phosphides (TMPs), while still encounter some challenges to obtain desirable stability and sustaining catalytic activity. Herein, the Fe-CoP/Ni 2 P@NC/CC-350 self-supported electrode was successfully synthesized via pyrolysis of FeNi/ZIF-67/CC precursors followed by phosphating. In this structure, Fe-doped CoP and Ni 2 P composite nanoparticles are uniformly confined in the porous carbon matrix and anchored firmly on the surface of carbon cloth (CC). Moreover, the flocculent-like Fe-CoP/Ni 2 P@NC/CC-350 demonstrates superhydrophilicity to significantly facilitate mass transfer, while the unique morphology originates from a facile strategy of soaking ZIF-67/CC in the mixed solution composed of FeSO 4 and NiSO 4 . The synthesized Fe-CoP/Ni 2 P@NC/CC-350 integrates the advantages of abundant active sites, confinement effect, interface regulation and superhydrophilicity, thereby demonstrating superior HER and OER activities and stabilities in an alkaline medium (1.0 M KOH). Remarkably, Fe-CoP/Ni 2 P@NC/CC-350 electrodes used both as anode and cathode require a cell voltage of only 1.49 V at 10 mA cm −2 , much lower than that of the well-established 20 % Pt-C/CC and RuO 2 /CC couple (1.612 V). Besides, Fe-CoP/Ni 2 P@NC/CC-350 Fe-CoP/Ni 2 P@NC/CC-350 system exhibits an outstanding stability for monitoring water splitting up to 100 h at 10 mA cm −2 . DFT results further confirm that the heterointerface and Fe doping in Fe-CoP/Ni 2 P@NC/CC-350 lead to a upshift d-band center of active sites and decreased reaction Gibbs energy barrier for the rate-determining step during catalysis, thereby contributing to the superior HER and OER activities. The work provides a novel strategy to construct a superhydrophilic microstructure, and the synergistic effect of electrons originating from the heterointerface and doping paves the way for designing electrocatalysts with high activities toward water splitting.
研究领域:
材料科学
·
电化学
·
催化科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Shaosheng Rao,Yangyang Sun,Juan Xie,Chenglong Chen,Chuang Zhi,Rong Ma,Qinqin Liu,Juan Yang
Although photocatalytic disinfection can avoid secondary pollution and other shortcomings compared to traditional disinfection methods, its development is seriously hindered by poor charge separation and transfer efficiency. Herein, we design a Zn-NC (single Zn atoms embedded in nitrogen-doped carbon) bridged ZnO/C 3 N 4 Z-scheme heterojunction (ZnO/Zn-NC/C 3 N 4 ) with robust interface contact by a multi-interfacial engineering strategy to achieve highly efficient separation and transfer of charge. Experimental and theoretical analyses demonstrate that the tightly integrated interface and excellent electrical conductivity of Zn-NC electron bridges ensure effective transfer of photogenerated charge carriers. Compared to ZnO/C 3 N 4 , the introduction of Zn-NC electron bridges induces charge rearrangement at the interface, generating a strong built-in electric field in the ZnO/Zn-NC/C 3 N 4 Z-scheme heterojunction to facilitate the separation and transfer of photogenerated charge carriers. Furthermore, Zn-NC electron bridges effectively promote the adsorption and activation of oxygen on the surface of ZnO/Zn-NC/C 3 N 4 , enhancing the generation of reactive oxygen species for rapid bacteria elimination in water. Consequently, the ZnO/Zn-NC/C 3 N 4 Z-scheme heterojunction, at a concentration of 100 ppm, achieves 99.9 % antibacterial efficiency against methicillin-resistant Staphylococcus aureus , Staphylococcus aureus , and Escherichia coli at a bacterial concentration of ∼ 10 7 CFU/mL under AM 1.5G simulated sunlight irradiation for 60 min, which is approximately 1.05 times higher than that of ZnO/C 3 N 4 . Moreover, ZnO/Zn-NC/C 3 N 4 maintains a 99.9 % bactericidal efficiency for natural water treatment using a homemade microreactor, demonstrating its potential for water disinfection.
研究领域:
环境科学
·
材料科学
·
微生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）