Journal
APPLIED CATALYSIS B-ENVIRONMENTAL
Volume 265, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.apcatb.2019.118584
Keywords
Ni-Co-20-P arrays; Synergistic effect; NaBH(4)hydrolysis; Hydrogen evolution reaction
Funding
- National Natural Science Foundation of China [21965005]
- Natural Science Foundation of Guangxi Province [2018GXNSFAA294077]
- Project of High-Level Talents of Guangxi [F-KA18015, 2018ZD004]
- Innovation Project of Guangxi Graduate Education [XYCSZ2019056, YCBZ2019031]
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Designing a bifunctional catalyst that performs hydrolysis of metal hydrides and water reduction spontaneously is an essential step towards developing an integrated H-2 storage system. Herein, a series of rugae-like CoP-Ni2P arrays decorated Ni foam (Ni-Co-x-P@NF) are fabricated by two-step electrodeposition followed by phosphating treatment. The optimized Ni-Co-20-P@NF catalyst shows a superior catalytic H-2 generation by NaBH4 hydrolysis, giving a specific H-2 generation rate of 4323.0 mL min(-1) g(-1) catalyst and good reusability, far better than most previously reported catalysts. Besides, the catalyst also exhibits an excellent electrocatalytic hydrogen evolution reaction with a low overpotential of 67.0 mV to reach -10 mA cm(-2), small Tafel slope and long-term stability in 1.0 M KOH. The outstanding catalytic H-2 generation capacity is attributed to the synergistically catalytic effect between the Ni2P and CoP species, as well as the unique composite structure with the benefit of solute transport and gas emission.
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