Journal
APPLIED CATALYSIS B-ENVIRONMENTAL
Volume 263, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.apcatb.2019.118324
Keywords
Ru-NiFe-P nanosheets; Water splitting; Bifunctional material; DFT calculation
Funding
- Natural Science Foundation of China [91741105]
- Chongqing Municipal Natural Science Foundation [cstc2018jcyjAX0625]
- Fundamental Research Funds for the central Universities [SWU116043]
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Highly active and stable catalysts toward hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) is extremely important but challenging for overall water splitting. Herein, a strategy by modulating surface electron densities is adopted to design new catalyst: the Ru-NiFe-P nanosheets on 3D self-supported nickel foam was developed by doping a small quantity of Ru into transition metals phosphates. The designed catalyst displays excellent electrocatalytic performance in 1.0 M KOH, with low overpotentials of 44 mV at 10 mA cm(-2) for HER and 242 mV at 100 mA cm(-2) for OER. Particularly, it only needs 1.47 V to yield 10 mA cm(-2) for overall water splitting. Density functional theory calculations reveal that Ru-incorporated NiFe-P can generate new active sites on Ru atoms and increase the catalytic activity of original P sites leading to an optimal Gibbs free-energy on catalysts surface. This work offers a new perspective for designing admirable electrocatalysts.
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