Free-standing multi-hierarchical MoC-based catalyst for pH-universal hydrogen evolution reaction at ultra-high current density

文献情報

出版日 2023-12-19

DOI 10.1039/D3TA06588J

インパクトファクター 12.732

著者

Nan Lu, Yue Liang, Cai-Yun Ren, Xue Liang, Yong-Chao Zhang, Xiao-Dong Zhu, Jian Gao

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要旨

An efficient and durable free-standing electrocatalyst is the key to achieving pH-universal hydrogen evolution reaction under ultra-high current density. Herein, the free-standing three-stage concentric shaft structure of MoC@C shell-supported MoC nanoparticles anchored Ni@N-doped carbon nanotube vertical nanoarrays (P-MoC/Ni@NCNTs-MoC@C) are fabricated through a simple spraying and pyrolysis process. The formation of a MoC@C shell facilitates Ni nanoparticles' anchoring, resulting in Ni@N-doped carbon nanotube vertical arrays (Ni@NCNTs). Additionally, the Ni@NCNTs effectively capture the escaped molybdenum vapor, leading to the generation of MoC nanoparticles. The unique structure provides increased catalytic active sites and larger specific surface area, improving charge transfer and the release of bubbles. As such, the free-standing P-MoC/Ni@NCNTs-MoC@C catalyst exhibits lower overpotentials compared to previously reported articles, with values of 238.1 mV in 1.0 M KOH (1800 mA cm−2), 250.2 mV in 0.5 M H2SO4 (1800 mA cm−2), and 567.9 mV in 1.0 M PBS (1000 mA cm−2). Additionally, it represents low Tafel slopes of 71.1 mV dec−1, 67.4 mV dec−1, and 130.3 mV dec−1 in alkaline, acidic, and neutral condition, respectively. The current work may provide insight into the rational design of free-standing catalysts for practical applications.

掲載誌

Journal of Materials Chemistry A

CiteScore: 19.5

自己引用率: 4.7%

年間論文数: 2211

Journal of Materials Chemistry A, B & C cover high quality studies across all fields of materials chemistry. The journals focus on those theoretical or experimental studies that report new understanding, applications, properties and synthesis of materials. The journals have a strong history of publishing quality reports of interest to interdisciplinary communities and providing an efficient and rigorous service through peer review and publication. The journals are led by an international team of Editors-in-Chief and Associate Editors who are all active researchers in their fields. Journal of Materials Chemistry A, B & C are separated by the intended application of the material studied. Broadly, applications in energy and sustainability are of interest to Journal of Materials Chemistry A, applications in biology and medicine are of interest to Journal of Materials Chemistry B, and applications in optical, magnetic and electronic devices are of interest to Journal of Materials Chemistry C. More than one Journal of Materials Chemistry journal may be suitable for certain fields and researchers are encouraged to submit their paper to the journal that they feel best fits for their particular article. Example topic areas within the scope of Journal of Materials Chemistry A are listed below. This list is neither exhaustive nor exclusive. Artificial photosynthesis Batteries Carbon dioxide conversion Catalysis Fuel cells Gas capture/separation/storage Green/sustainable materials Hydrogen generation Hydrogen storage Photocatalysis Photovoltaics Self-cleaning materials Self-healing materials Sensors Supercapacitors Thermoelectrics Water splitting Water treatment

Free-standing multi-hierarchical MoC-based catalyst for pH-universal hydrogen evolution reaction at ultra-high current density

文献情報

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