期刊
ACS APPLIED MATERIALS & INTERFACES
卷 14, 期 24, 页码 27842-27853出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.2c04562
关键词
hydrogen evolution reaction; oxygen evolution reaction; Janus nanoparticles; FeOx/FeNi3; electrocatalysts; bifunctional electrocatalysts; in situ combustion method
资金
- National Natural Science Foundation of China [NSFC 21806099, 21671127]
- Guangdong Basic and Applied Basic Research Foundation [2019A1515010076, 2019A1515012156]
- 2020 Li Ka Shing Foundation Cross-Disciplinary Research Grant [2020LKSFG09A, 2020LKSFG01A]
- City University of Hong Kong Strategic Research Grant (SRG) [7005505]
In this study, a durable and bifunctional Ni-FeOx/FeNi3/NF catalyst was prepared through in situ solution combustion and subsequent calcination, showing excellent alkaline water splitting activity and stability.
Ni-/Fe-based materials are promising electrocatalysts for the oxygen evolution reaction (OER) but usually are not suitable for the hydrogen evolution reaction (HER). Herein, a durable and bifunctional catalyst consisting of Ni-FeOx and FeNi3 is prepared on nickel foam (Ni-FeOx/FeNi3/NF) by in situ solution combustion and subsequent calcination to accomplish efficient alkaline water splitting. Density functional theory (DFT) calculation shows that the high HER activity is attributed to the strong electronic coupling effects between FeOx and FeNi3 in the Janus nanoparticles by modulating Delta G(H*) and electronic states. Consequently, small overpotentials (eta) of 71 and 272 mV in HER and 269 and 405 mV in OER yield current densities (j) of 50 and 1000 mA cm(-2), respectively. The catalyst shows outstanding stability for 280 and 200 h in HER and OER at a j of similar to 50 mA cm(-2). Also, the robustness and mechanical stability of the electrode at an elevated j of similar to 500 mA cm(-2) are excellent. Moreover, Ni-FeOx/FeNi3/NF shows excellent water splitting activities as a bifunctional catalyst as exemplified by j of 50 and 500 mA cm(-2) at cell voltages of 1.58 and 1.80 V, respectively. The Ni-FeOx/FeNi3/NF structure synthesized by the novel, simple, and scalable strategy has large potential in commercial water electrolysis, and the in situ combustion method holds great promise in the fabrication of thin-film electrodes for different applications.
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