Industrial-scale efficient alkaline water electrolysis achieved with sputtered NiFeV-oxide thin film electrodes for green hydrogen production

文献情報

出版日 2023-11-22

DOI 10.1039/D3TA05699F

インパクトファクター 12.732

著者

Quoc-Nam Ha, Chen-Hao Yeh, Noto Susanto Gultom

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要旨

We propose a magnetron sputtering technique to enhance HER and OER performance with a bifunctional vanadium-substituted NiFe-based catalyst electrode formed into a NiFeV-oxide thin film. The sputtering approach generates oxygen vacancies by creating nonstoichiometric oxidation phases, i.e., Fe3O4−x and VO2−y. Operando Raman spectroscopy reveals a synergistic effect between active metal sites and oxygen vacancies to promote the formation of a reconstructed active layer, i.e., NiFe(oxy)hydroxyl, during anodic oxidation. This phase transition optimizes the adsorption energy of water intermediates to accelerate the water splitting. Moreover, the leaching of vanadium also plays a vital role in the activation and surface restructuring processes of the NiFeV-oxide pre-catalyst during OER electrocatalysis. Feasibility studies for an NFV-0.7(−)‖NFV-0.7(+) stack-cell electrolyzer indicate that it delivers a high current density of 1000 mA cm−2 at low cell potentials of 2.00 V (without cell heating) and 1.84 V (at 60 °C) and exhibits excellent stability at 1000 mA cm−2 over 100 h. Our work offers a new paradigm for designing efficient bifunctional electrocatalysts, holding great promise for industrial-scale water splitting.

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

Industrial-scale efficient alkaline water electrolysis achieved with sputtered NiFeV-oxide thin film electrodes for green hydrogen production

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