Author(s) Dutta, S.; Indra, A.; Feng, Y.; Song, T.; Paik, U.
Journal ACS Appl Mater Interfaces
Date Published 2017 Sep 01

Designing of efficient, low-cost, and stable electrocatalyst systems towards energy conversion is highly demanding for their practical use. Large scale electrolytic water splitting is considered as the promising strategy for the clean and sustainable energy production. Herein, we report a self-supported NiFe layered double hydroxide (LDH)-NiSe electrocatalyst by stepwise surface-redox-etching of Ni foam (NF) through hydrothermal process. The as-prepared NiFe LDH-NiSe/NF catalyst exhibits far better performance in alkaline water oxidation, proton reduction, and overall water splitting compared to NiSex/NF or NiFe LDH/NF. Only 240 mV overpotential is required to obtain the water oxidation current density of 100 mA cm-2 whereas the same for the hydrogen evolution reaction is 276 mV in 1.0 M KOH. The synergistic effect from NiSe and NiFe LDH leads to the evolution of a highly efficient catalyst system for water splitting by achieving 10 mA cm-2 current density at only 1.53 V in two-electrode alkaline electrolyzer. In addition, the designed electrode produces stable performance for long time even at higher current density to demonstrate its robustness and prospective as real-life energy conversion system.

DOI 10.1021/acsami.7b07984
ISSN 1944-8252
Citation ACS Appl Mater Interfaces. 2017.

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