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Indexed by:期刊论文

Date of Publication:2019-06-07

Journal:INTERNATIONAL JOURNAL OF HYDROGEN ENERGY

Included Journals:SCIE、EI

Volume:44

Issue:29

Page Number:14955-14967

ISSN No.:0360-3199

Key Words:Surface selective removal; Nickel tin; Water oxidation

Abstract:The design of cost-efficient earth-abundant catalysts with superior performance for oxygen evolution reaction (OER) is extremely important for future renewable energy production. The synthesis of high-surface-area catalysts with high intrinsic activity remains challenging. In this work, in-situ surface selective removal method by electrochemical oxidation is used to synthesize nickel (oxy)hydroxide covered Ni3Sn2 supported on carbon nanotubes (Ni3Sn2@NiOxHy/CNT), which exhibits 10, 100, 200 and 300 mA cm(-2) at over-potential of 250, 317, 329 and 335 mV in OER, respectively. In-situ surface selective removal of Sn from the crystal lattices and oxidation of Ni under anodic oxidation provide highly active amorphous NiOxHy with abundant surface defects, leading to the high apparent activity (current density) and intrinsic activity (TOF) of the Ni3Sn2@NiOxHy/CNT. This work develops a general method to synthesize high-surface-area water oxidation catalysts, which can be used to prepare a series of catalysts for oxygen evolution reaction in the near future. (C) 2019 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.