Highly porous Ni-P electrode synthesized by an ultrafast electrodeposition process for efficient overall water electrolysis

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The development of high-efficiency catalysts for hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) is essential to lower the energy losses during water electrolysis. Herein, a highly porous Ni-P (HP Ni-P) electrode, prepared by an ultrafast electrodeposition within only ten seconds, is presented with superior electrocatalytic activity towards both HER and OER in alkaline media: overpotentials of 96 and 323 mV are required to reach a current density level of 100 mA cm(-2)for HER and OER, respectively, with corresponding Tafel slopes of 32.9 and 44.0 mV dec(-1). Experimental analyses and theoretical calculations show that charge transfer occurs from Ni to P and the HER kinetics is accelerated by the increased hydrogen coverage, enhanced water dissociation ability, and optimized hydrogen adsorption energy on the HP Ni-P. Under OER conditions, surface P is oxidized into PO43-, promoting oxidation of Ni to OER-active NiOOH and exposing abundant OER-active sites on the HP Ni-P surface. An alkaline electrolysis cell was constructed with HP Ni-P as the cathode and anode (Ni-P||Ni-P) and outperformed the Pt/C||IrO(2)cell at cell voltages exceeding 1.68 V. This work provides a practically applicable method to prepare HER and OER electrodes for use in industrial water electrolyzers, with insight into the activities of the catalysts.
Publisher
ROYAL SOC CHEMISTRY
Issue Date
2020-06
Language
English
Article Type
Article
Citation

JOURNAL OF MATERIALS CHEMISTRY A, v.8, no.24, pp.12069 - 12079

ISSN
2050-7488
DOI
10.1039/d0ta03739g
URI
http://hdl.handle.net/10203/275586
Appears in Collection
MS-Journal Papers(저널논문)
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