JOURNAL OF ALLOYS AND COMPOUNDS
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2024
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IF 5.8
Hongyu Li,Ting Wang,Ming Xu,Ping Wang,Ze Gao,Wenjing Zhang,Mei Liu,Ming Feng
Electrocatalysis is a promising approach for sustainable hydrogen generation, and the exploration of effective electrocatalysts for hydrogen evolution reactions (HER) is of great significance for exploiting and utilizing renewable energy. Herein, the magnetic FeMo/Mo 2 C@C composites with multi-heterostructure interfaces and hierarchical structure are first designed and fabricated via molybdenum blue preassembly strategy by using Keplerate polyoxomolybdate {Mo 72 Fe 30 } and melamine as precursors. Benefiting from its unique characteristics, FeMo/Mo 2 C@C catalyst exhibits superior HER electrocatalytic activity than pure Mo 2 C@C. Interestingly, the optimized FeMo/Mo 2 C@C presents the HER magnetic reinforcement by simply applying an magnetic field, characteristic of 97 mV@10 mA cm –2 , 201 mV@50 mA cm –2 , and a robust durability for more than 18 h, which are 120 and 85 mV less than that of FeMo/Mo 2 C@C without magnetization, and greatly lower than comparative Mo 2 C@C catalyst (272 mV@10 mA cm –2 and 396 mV@50 mA cm –2 ). This may be attributed to that the FeMo/Mo 2 C@C can afford fast electrons transmitting from electrode to active sites during HER process when imposing an external magnetic field. This work offers a novel design direction to develop magnetic transition metal based-materials for electrochemical applications and paves a new way to utilize the magnetic enhancement to further improve the hydrogen evolution performance.
研究领域:
材料科学
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可再生能源
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电化学
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2024
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IF 5.8
Qinrui Sun,Ning Wang,Guihua Liu,Jingde Li,Xiaohang Du,Shujuan Sun
Dimensionally stable RuO 2 -based anodes have achieved excellent performance in the field of electrochemical treatment of wastewater, however, the high price of Ru hinders its industrial application. Herein, TiO 2 nanotubes-supported RuO 2 with ultralow Ru loading (0.34 wt%) and trace Fe and Mo doping (RuFeMo@TiO 2 ) was prepared as anode for efficient degradation of methylene blue. It shows that Fe and Mo doping reduce the oxidation state of Ru (Ru n+ , n < 4). In addition, the potential electroactive sites of the electrodes are effectively enhanced by Mo doping. While the Fe doping is found to improve the generation of hydroxyl radicals (·OH) and superoxide anion ( O 2 − ), which are the dominant oxidants for the degradation of methylene blue. In result, the RuFeMo@TiO 2 catalyst exhibits high performance towards methylene blue degradation of 97.5 % within 2 hours. It shows that the cooperation of trace transition metals enables efficient degradation of organic dye with ultralow-loaded Ru electrocatalyst, implying a promising application in wastewater treatment.
研究领域:
环境科学
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电化学
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废水处理
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DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
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2022
·Vol. 46
·期 35
·16743-16751
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IF 3.925
Kun Jiang,Kai Li,Shuirong Li,Yan Li,Tao Li,Yun-Quan Liu,Duo Wang,Yueyuan Ye
Transition metal nitrogenous complexes have been extensively studied for electrochemical synthesis of ammonia due to their great capabilities in adsorbing and activating nitrogen molecules; yet the improvement of their catalytic performance is still a big challenge. Herein, a series of novel bimetallic Fe, Mo–N nanosheet arrays (FeMo–N) supported on nickel foam were fabricated through a facile hydrothermal–pyrolysis method, which were used as electrocatalysts for the nitrogen reduction reaction (NRR). It was discovered that the catalyst Fe1Mo1–N exhibited a promising performance with a NH3 yield rate of 46.64 μg mg−1cat. h−1 and a faradaic efficiency (FE) of 1.12% at −0.8 V vs. RHE, which also demonstrated excellent selectivity and thermal stability. The specific two-dimensional nanosheet morphology of the catalyst was believed to be the major reason contributing to the prominent electrochemical performance. The XPS characterization and NH3 yield study at different N contents in the M–N bond further revealed that FeMo–N species are the primary active centers for the NRR, and the N content forming the M–N bond is closely related to the catalytic activity.
研究领域:
材料科学
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电化学
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产品关联
DOI
高影响因子
Journal of Environmental Sciences
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2022
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IF 6.796
Xuedong Du,Wenyang Fu,Pei Su,Qizhan Zhang,Minghua Zhou
An ultra-efficient electro-Fenton catalyst with porous carbon coated Fe-Mo metal (FeMo@PC), was prepared by calcining MIL-53(Fe)@MoO 3 . This FeMo@PC-2 exhibited impressive catalytic performance for sulfamethazine (SMT) degradation with a high turnover frequency value (7.89 L/(g·min)), much better than most of reported catalysts. The mineralization current efficiency and electric energy consumption were 83.2% and 0.03 kWh/g TOC , respectively, at low current (5 mA) and small dosage of catalyst (25.0 mg/L). The removal rate of heterogeneous electro-Fenton (Hetero-EF) process catalyzed by FeMo@PC-2 was 4.58 times that of Fe@PC/Hetero-EF process. Because the internal-micro-electrolysis occurred between PC and Fe 0 , while the co-catalysis of Mo accelerated the rate-limiting step of the Fe 3+ /Fe 2+ cycle and greatly improved the H 2 O 2 utilization efficiency. The results of radical scavenger experiments and electron paramagnetic resonance confirmed the main role of surface-bound hydroxyl radical oxidation. This process was feasible to remove diverse organic contaminants such as phenol, 2,4-dichlorophenoxyacetic acid, carbamazepine and SMT. This paper enlightened the importance of the doped Mo, which could greatly improve the activity of the iron-carbon heterogeneous catalyst derived from metal-organic frameworks in EF process for efficient removal of organic contaminants.
研究领域:
环境科学
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材料科学
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产品关联
DOI
PubMed
高影响因子
Journal of Energy Storage
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2025
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IF 9.8
Jiaqi Zhang,Liansen Bian,Ning Zhang,Bolun Wang,Shusheng Cao,Xusheng Wang,Yingyan Zhao,Longfei Shao,Rui Yang,Yanyue Wang,Hao Du,Jiaze Yan,Yan Zhang,Xi Lin,Jianxin Zou
The design and construction of efficient catalysts for Mg-based hydrogen storage materials are of great importance for promoting their industrial applications. In the present work, a composite of g-C 3 N 4 (NCN) supported FeMoO 4 was prepared and introduced into MgH 2 as a catalyst precursor through ball milling. As a result of the reaction between FeMoO 4 and MgH 2 , a nano FeMo catalyst formed in-situ and provides excellent catalytic effect on MgH 2 . For instance, the catalyzed Mg/MgH 2 system started to dehydrogenate at about 187 °C, with a total dehydrogenation of 6.1 wt% achieved in 6 min at 275 °C. It can absorb 6 wt% H 2 in 2 min under 3 MPa pressure at 150 °C. Meantime, the hydrogen desorption and absorption activation energy of the composite system dropped down to 85.3 kJ/mol H 2 and 44.72 kJ/mol H 2 , respectively. Furthermore, the presence of g-C 3 N 4 nanosheets (NCN) provides a good nano-separation effect for MgH 2 , and the composite system exhibits high cycling stability (95.3 % capacity retention after 50 cycles) and fast kinetic. Theoretical calculation shows that the interaction between FeMo and MgH 2 weakened the Mg-H bond, thus promoting the decomposition of MgH 2 at lower temperatures. This study provides a new strategy for the design of efficient catalysts with multiple promotion functions for high performance solid-state hydrogen storage materials.
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产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
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2025
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IF 7.2
Yushan Cao,Chuan Cao,Zhirong Sun,Xiang Hu
Calcination temperature affects the formation of metal species. By calcining nitrogen-doped Fe/Mo bimetallic MOF at a higher temperature (700 °C), a core-shell structure MOF-derived carbon material (FeMo@NPC-700) containing transition metal nitride (TMN) was successfully prepared and used as a cathode for the degradation of tetracycline (TC) in the electro-Fenton system. Due to the high catalytic activity of TMN and the synergistic catalytic effect of Mo, the FeMo@NPC-700 cathode achieved 98.9% removal of TC within 30 min and 51% removal of total organic carbon (TOC) within 60 min. It was verified that Fe 3 N played an important role in the degradation of TC, contributing 68% to the degradation. In addition, quantitative analysis of the reactive oxygen species (ROSs) in the system showed that ·OH was the main ROS dominating the degradation of tetracycline. Finally, four possible pathways of TC degradation were proposed based on HPLC-MS analysis, and the toxicity of the intermediates was analyzed by ecological active-structure relationship. This study provides a reference for the preparation of MOF-derived carbon materials containing TMN.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
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