Journal
APPLIED CATALYSIS B-ENVIRONMENTAL
Volume 258, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.apcatb.2019.117953
Keywords
Ni-Co-Mo-O nanosheets; NiCo nanoparticles; Synergistic effect; Electrocatalyst; Hydrogen evolution reaction
Funding
- Natural Science Foundation of Tianjin [18JCYBJC17600]
- Key Laboratory of Advanced Ceramics and Machining Technology, Ministry of Education (Tianjin University)
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The development of efficient and durable HER electrocatalysts is urgently required to enhance the efficiency of water splitting. Here we report the Ni-Co-Mo-O nanosheets decorated with NiCo nanoparticles supported on NF (NF/NiCoMoO-H-2) as efficient HER electrocatalysts in alkaline media. The introduction of oxygen vacancies and multiple metal ions (Ni-Co-Mo-O nanosheets) accelerates water dissociation, while metal atoms (NiCo nanoparticles) promote the adsorption and association of hydrogen intermediates into H-2 molecules. The efficiently synergistic effect between Ni-Co-Mo-O nanosheets and NiCo nanoparticles results in the NF/NiCoMoO-H-2 with a low overpotential of 15 mV at 10 mA cm(-2) and Tafel slope of 33.1 mV dec(-1). More importantly, the water-alkali electrolyzer using NF/NiCoMoO-H-2 as cathode and NF/NiFe-LDH as anode shows a low voltage of 1.44 V at 10 mA cm(-2) and remarkable stability. Owing to the controllable fabrication process and excellent HER performance, the NF/NiCoMoO-H-2 is a promising electrocatalyst for the practical water splitting.
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