期刊
JOURNAL OF CATALYSIS
卷 394, 期 -, 页码 104-112出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcat.2020.12.037
关键词
Electrodeposition; Iron; Nickel; Films; Alkaline; Hydrogen evolution reaction; Electrochemically active surface area; Intrinsic activity
资金
- U.S. Department of Energy, Office of Science, Basic Energy Sciences, Catalysis Science Program [DE-SC0016529]
- U.S. Department of Energy (DOE) [DE-SC0016529] Funding Source: U.S. Department of Energy (DOE)
The study found that films with higher Fe content exhibited higher electrocatalytic activity in alkaline media, while intrinsic HER activity also increased with higher Ni content. Different analysis methods revealed the effects of surface area and activity on overall measured HER activity, emphasizing the importance of ECSA.
The synthesis and electrocatalytic activity of FexNi100-x electrochemically deposited films were investigated. Films were evaluated for the hydrogen evolution reaction (HER) in alkaline media with respect to composition and electrochemically active surface area (ECSA). Results demonstrate that films of higher or equal Fe content had an ECSA tenfold greater than films with higher Ni. When normalized by geometric surface area, Fe50Ni50 films required the lowest overpotential of -390 mV to reach a current density of -10 mA cm(2). However, when normalized by the ECSA, intrinsic HER activity increases as Ni content increases. Tafel slope, ECSA, microscopy, and impedance spectroscopy analyses allow a decoupled analysis of surface area versus activity effects on overall measured HER activity. These analyses collectively demonstrate that the increase in electrocatalytic activity is attributed to the increase in ECSA and not to an enhancement in the intrinsic activity by Fe and Ni component interactions. (C) 2021 Elsevier Inc. All rights reserved.
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