JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
·
2023
·
IF 4
Chongjun Zhao,Wenlei Cai,Nan Sun,Shi Chen,Wenbin Jing,Chunhua Zhao
A high-entropy metal-organic framework (MOF) is synthesized as a precursor by using a one-step solvothermal method, which is converted into a face-centered cubic high-entropy alloy (FeCoNiCuMnZn) after the thermal reduction in an Ar/H 2 atmosphere. Due to its low boiling point, metallic Zn, as a sacrificial template, is evaporated from the alloy during the thermal reduction process and leaves room or pore, and thus porous high-entropy alloy nanoparticles (FeCoNiCuMn-NPs) form. The porous high-entropy alloy nanoparticles have the largest electrochemically active surface area (3810 cm 2 ), and exhibit excellent OER performance: At a current density of 10 mA cm −2 , the overpotential is 196 mV, and the Tafel slope 55 mV dec −1 . In addition, the porous high-entropy alloys nanoparticles-based electrode remain stable even after 75 h of continuous operation.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
Applied Materials Today
·
2025
·
IF 6.9
Yunpeng Ju,Wenhao Huang,Zhen Gao,Mingquan Liu,Naibao Huang
Effective bifunctional electrocatalysts for Oxygen reduction reaction and Oxygen evolution reaction (ORR and OER) are key for fuel cells and water electrolysis. Co-based dodecahedral bifunctional catalysts, rich in Co-N, pyridinic nitrogen, and metallic cobalt nanoparticles, were synthesized by pyrolysis of ZIF-67. The obtained ZIF-67–6 catalyst showed an onset potential of 0.90 V, a half-wave potential of 0.83 V (vs. RHE), a limiting diffusion current density of 5.24 mA cm⁻² for ORR, and an overpotential of 1.50 V (vs. RHE) at 10 mA cm⁻² for OER. These values are comparable to those of commercial 20 % Pt/C (0.89 V onset potential, 0.83 V half-wave potential, and 4.27 mA cm⁻² limiting diffusion current density) and IrO₂ (1.53 V overpotential at 10 mA cm⁻²). The catalyst maintained 92.11 % of its current density after polarizing at 0.80 V for 10,000 s. ZIF-67–6′s high performance and stability are attributed to the porous structure from MOF pyrolysis, the deposited cobalt nanoparticle, and the higher Co-N and the pyridinic nitrogen content. This work offers a practical method to produce nitrogen- and cobalt-rich bifunctional electrocatalysts with dodecahedral structures.
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2024
·
IF 8.1
Jing Wang,Min Wang,Zhenjiang Lu,Jing Xie,Jianguo Huang,Jindou Hu,Yali Cao
The inefficient Ni/Fe ion utilization and poor electrical conductivity of nickel-iron layered double hydroxide (NiFe-LDH) restricts to its development in electrocatalytic oxygen evolution reaction/urea oxidation reaction (OER/UOR). Herein, self-supported Hf-doped NiFe-LDH nanosheet arrays were successfully prepared on nickel foam (Hf-NiFe-LDH/NF) via a one-step solvothermal approach for the first time, in which the introduced high-valent Hf 4+ altered the structure of electrons and chemical environment of the atoms and promoted the production of more active sites, thus realizing the fast kinetics of electron transfer on the layer. Meanwhile, the doped metal Hf ions increased the electric conduction and recycling stability of the catalyst. Astoundingly, the overpotential of Hf-NiFe-LDH/NF is barely 258 mV at a current density of 100 mA cm −2 , which is 61 mV lower than that of NiFe-LDH/NF, as well as outstanding stability for over 90 h during the OER. Similarly, the potential is only 1.37 V at 100 mA cm −2 during the UOR, 118 mV less was than at OER. Notably, Hf-NiFe-LDH/NF electrocatalyst exceeds the most previously reported electrocatalysts in terms of performance. This study highlights the benefits of Hf doping strategy in electrocatalytic OER/UOR and presents a promising new type of catalyst for future research.
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 SOLID STATE CHEMISTRY
·
2024
·
IF 3.2
Yan Lu,Weilin Weng,Yuanhang Lu,Xinxin Pang,Naixuan Hu,Banghua Peng
Hydrogen is increasingly recognized as a critical energy source for the future. Transition metal nitrides hydrogen catalysts have found to narrow the d-band contraction effectively and alter the filling state of the metal, thereby modulating the metal-hydrogen bonding energy and enhancing both electrical conductivity and catalytic activity. In this study, V-doped cobalt nitrides (V–Co 2 N/CoN) with two distinct crystalline structures were successfully synthesized through the nitriding of V-doped cobalt bicarbonate (V–CoCH) as a precursor. The morphology and structure of the resulting materials were carefully optimized by adjusting the V doping amount and nitriding temperature. For hydrogen evolution reaction (HER) and oxygen evolution reaction (OER), the final product V–Co 2 N/CoN-1-400 only needs 47 mV and 230 mV overpotential to reach 10 mA cm −2 , and works at 1.69 V to drive the overall water splitting for 10 mA cm −2 , showing good stability performance without fluctuation for about 10 h. This work implies that V-doped cobalt nitrides can lead to enhanced water splitting catalytic activity. Our findings may illustrate the significance of V doping for improving electrocatalytic performance, and demonstrate the potential of CoV bimetallic nitrides as effective electrocatalysts , offering valuable insights for the further development of non-precious metal nitride-based catalysts.
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
高影响因子
Catalysts
·
2026
·Vol. 16
·期 3
·260
·
IF 4.5
Lei Zhang,Xiaoli Ran,Jiyi Ma,Xiaohong Yang
Perovskite oxide photoanodes are attractive for alkaline water oxidation but are commonly limited by interfacial recombination and sluggish charge transfer. Here we enhance anisotropic SrTiO3(STO) photoelectrodes via Al doping by simple yet effective one-step hydrothermal method and identify an optimal composition at 4% Al. In 0.1 M NaOH (pH 13) under simulated AM 1.5G illumination, 4% Al:STO exhibits 2 times enhancement in photocurrent density and 80% increase in electrochemically active surface area compared with the pristine SrTiO3, as evidenced by the reduced charge-transfer resistance and enlarged light–dark photocurrent gap. together with a markedly reduced interfacial impedance, indicating accelerated charge extraction and transfer. Band-structure analysis shows a positive shift in flat-band potential and slight band-gap narrowing after Al doping, providing more favorable carrier energetics. Steady-state and time-resolved photoluminescence further demonstrate strong PL quenching and a prolonged carrier lifetime for 4% Al:STO. ECSA analysis suggests increased electrochemically accessible surface sites at the optimal doping level. Overall, moderate Al doping synergistically tunes defects, band energetics, and interfacial kinetics to improve STO photoanodes for solar water splitting.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ENVIRONMENTAL MANAGEMENT
·
2026
·
IF 9.2
Wenting Jia,Lin Guo,Zhao Yu,Zhiqiang Li,Pengge Ning,Hongbin Cao
The growing stream of end-of-life lithium-ion batteries from electronic and mobility products has created a pressing need to manage solid residues generated during battery-recycling operations. In ammonia-based leaching flowsheets used for selective critical metal recovery, manganese-rich solid residues (e.g., MnCO 3 or ammonium manganese sulfite/sulfate) are intentionally formed to avoid complex purification. Yet they are often retained as low-value waste due to impurities from unreacted cores. Here, we demonstrate a waste-to-resource pathway that bypasses solution phase recovery by upcycling manganese-rich residues directly into a γ-MnOOH alkaline oxygen evolution catalyst. The residue with MnCO 3 as the main precursor delivers the best performance, with an overpotential of 457.65 mV at 100 mA cm −2 and a Tafel slope of 60.37 mV dec −1 , demonstrating a favorable comparison with commercial noble metal and other benchmarks using commercial transition metal salts as raw materials. Structure-activity analysis attributes the performance to the preferential expression of the high-index facet. This direct solid-state route avoids reagent-grade manganese precursors, eliminates gypsum-forming steps, and cuts life cycle economic and energy demand. The work illustrates a practical waste-to-resource strategy that strengthens manganese security and advances circular economy goals in clean energy technologies.
✓ 已验证
DOI
PubMed
高影响因子
FUEL
·
2025
·
IF 7.5
Wenxuan Fan,Xiangmei Tang,Qingfeng Yi,Guang Li
Non precious metal catalysts (NMCs) are considered to have great potential for applications in oxygen reduction reaction (ORR) and water splitting reaction (OER and HER). Compared with traditional precious metal catalysts, NMCs have the characteristics of low cost, better catalytic performance, wider applicability, and better durability. This article reports a facile method for preparing layered Co-N-C catalysts by simple ball milling and pyrolysis of a mixture of graphite, ammonium carbonate, melamine and cobalt phthalocyanine. The synthesized nanoCo@bmGr and nanoCo@bmGr-EG samples exhibit excellent performance in ORR, OER and HER. For ORR in alkaline electrolyte, the nanoCo@bmGr and nanoCo@bmGr-EG present very close Tafel slopes to Pt/C catalyst. For OER under alkaline condition, the nanoCo@bmGr and nanoCo@bmGr-EG exhibit smaller Tafel slopes than IrO 2 catalyst, and at a current density of 10 mA∙cm −2 , their potential difference with IrO 2 is only 50 and 70 mV respectively. For the chronopotentiometric tests of OER at current densities of 20 and 30 mA∙cm −2 , the two samples show lower potentials than IrO 2 . In HER testing, nanoCo@bmGr and nanoCo@bmGr-EG display very similar onset potentials and Tafel slopes to Pt/C. This work provides a simple approach for preparing catalysts with good catalytic activity for ORR/OER/HER.
研究领域:
材料科学
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电化学
·
催化科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Jia Li,Yuantong Liu,Mengqin Yao,Shuo Geng,Fei Liu
Ruthenium dioxide (RuO 2 ) faces the problem of poor stability due to the involvement of lattice oxygen (O L ) and over-oxidation of ruthenium when involved in the oxygen evolution reaction (OER) under acidic conditions. To address this problem, a Mn-RuO 2 /CeO 2 heterojunction catalyst was developed in this study for the enhancement of acidic OER. The Mn-RuO 2 /CeO 2 catalyst exhibited an overpotential of 227 mV at 10 mA·cm −2 , and the degradation of the OER performance was negligible after 300 h of continuous operation in 0.1 M HClO 4 . Experimental and theoretical calculations showed that Mn doping enhanced the interfacial interactions between the heterojunctions, resulting in a catalyst containing more high-valent Ru favorable for catalytic activity. This electronic state modulation optimized the d-band centre of Ru in the catalyst and lowered the reaction barriers, which led to an increase in the catalytic activity. In addition, the involvement of lattice oxygen and the dissolution of Ru during the OER process were suppressed to a certain extent due to the preferential oxidation of Mn and the transfer of electrons to RuO 2 via CeO 2 , thus enhancing the stability. This study provides a new perspective for balancing the activity and durability of RuO 2 -based catalysts.
研究领域:
电化学
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催化
·
材料科学
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纳米技术
·
表面科学
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED MATERIALS
·
2020
·Vol. 33
·期 5
·2007525
·
IF 27.398
Jianhua Yan,Ying Wang,Yuanyuan Zhang,Shuhui Xia,Jianyong Yu,Bin Ding
Designing stable and efficient electrocatalysts for both oxygen reduction and evolution reactions (ORR/OER) at low-cost is challenging. Here, a carbon-based bifunctional catalyst of magnetic catalytic nanocages that can direct enhance the oxygen catalytic activity by simply applying a moderate (350 mT) magnetic field is reported. The catalysts, with high porosity of 90% and conductivity of 905 S m −1 , are created by in situ doping metallic cobalt nanodots (≈10 nm) into macroporous carbon nanofibers with a facile electrospinning method. An external magnetic field makes the cobalt magnetized into nanomagnets with high spin polarization, which promote the adsorption of oxygen-intermediates and electron transfer, significantly improving the catalytic efficiency. Impressively, the half wave-potential is increased by 20 mV for ORR, and the overpotential at 10 mA cm −2 is decreased by 15 mV for OER. Compared with the commercial Pt/C+IrO 2 catalysts, the magnetic catalyzed Zn–air batteries deliver 2.5-fold of capacities and exhibit much longer durability over 155 h. The findings point out a very promising strategy of using electromagnetic induction to boost oxygen catalytic activity.
研究领域:
电化学
·
材料科学
·
纳米催化
·
能源化学
·
物理化学
·
电分析化学
·
功能材料
✓ 已验证
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2026
·
IF 19.7
Bao Liu,Yi Li,Pengcheng Ding,Dan Li,Jiwei Li,Xuanwei Zhao,Jia Zu,Maoyu Wang,Ye Sun,Miao Yu
Developing efficient bifunctional electrocatalysts for water splitting remains challenging due to the antagonistic demands of oxygen and hydrogen evolution reactions (OER/HER). Herein, we present a ternary heterointerface non-precious catalyst, Ni/WC-Mo 2 C, for bidirectional HER and OER optimization. Combining in situ characterization and theoretical calculations, we demonstrate how this design overcomes conventional Schottky junction limitations: (i) The band gradient of the WC-Mo 2 C semiconductor heterojunction synergizes with metallic Ni's electron-donating properties to construct an "electron staircase" channel to enhance charge transfer while increasing active electron density and lowering the d -band center; and (ii) ternary interface-induced lattice strain buffering and localized electron redistribution stabilize high-valent Ni species and optimize intermediate adsorption/desorption energetics. This synergy resolves the OER-HER electronic conflict, endowing the catalyst with ultralow overpotentials of merely 26 mV for HER and 153 mV for OER at a current density of 10 mA cm −2 in 1.0 M KOH electrolyte. The assembled electrolyzer delivers a high current density of 1000 mA cm −2 at a low cell voltage of 1.73 V and sustains stable overall water splitting operation for an extended duration of 1200 h, outperforming noble-metal benchmarks (Pt/C||RuO 2 ). This work establishes a new paradigm for non-precious bifunctional electrocatalyst design through multicomponent heterointerface engineering.
✓ 已验证
产品关联
DOI
高影响因子
CATALYSIS COMMUNICATIONS
·
2022
·
IF 3.51
Chaocheng Liu,Yinghui Li,Jiedong Cui,Zhiyun Qian,Detao Liu
Here we report a simple efficient one-step strategy to fabricate Oxidation Reduction Reaction (ORR) or/and Oxygen Evolution Reaction (OER) electrocatalysts directly from agricultural cornstalks waste with hierarchical porous structures and massive active hydroxyl groups. CaCl 2 and NH 4 Cl activators were utilized to corrode the cornstalks in order to create a mesopore N-doped hybrid structure that was sufficiently stable under the high-temperature pyrolysis process, which prevented neighboring aggregates of transition metals. The synergistic effect of N, B and Fe, Co within the hierarchical biochar structures guaranteed a favorable ORR activity of 0.848 V and OER activity of 393 mV for the CaCl 2 sample, showed better stability than commercial Pt/C and IrO 2 catalysts.
研究领域:
材料科学
·
电化学
·
可再生能源
·
环境科学
·
催化
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Huan Gao,Fengqi Han,Shasha Yi,Lu Chen,Deliang Chen
Perovskite oxide (ABO 3 ) is a potential oxygen evolution reaction (OER) electrocatalyst , and its B-site is generally regarded as the active center. However, perovskite oxides suffer from poor conductivity and insufficient active sites due to severe calcination during high-temperature synthesis. To address these issues, we started from a well-demonstrated OER catalyst Ba 0.5 Sr 0.5 Co 0.8 Fe 0.2 O 3-δ (BSCF) and developed an approach to load abundant active sites with the exsolution of CoFe nanoparticles from parent phase BSCF. During this process, ZIF-67 has been used as the carbon source to generate highly conductive network of cobalt-doped carbon and further fabricated as BSCF/ZIF (67) -650 composite. Such hybrid catalyst exhibits an overpotential of 285 mV at current density of 10 mA cm −2 and a minor Tafel slope of 40 mV dec −1 in 1 M KOH alkaline solution. The remarkably enhanced activity is attributed to the increment of active sites, oxygen vacancies and excellent conductivity. Importantly, such OER performance shows excellent stability for 200 h operation.
研究领域:
材料科学
·
电化学
·
能量存储与转换
·
纳米材料
·
催化
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）