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- Title
Structure and Electrocatalytical Properties of Electrodeposited M-Ir (M = Co, Ni) Bimetallic Alloy Catalysts with Low Ir Loading Obtained on Copper Foams for Hydrogen Evolution Reaction.
- Authors
Zhou, Yicheng; Ju, Liu; Yang, Yang; Wu, Wangping
- Abstract
M-iridium (M = cobalt (Co), nickel (Ni)) bimetallic alloy catalysts with low iridium (Ir) loading of 0.3–2.0 mg·cm−2 were prepared on copper foam (CF) supports by electrodeposition. The top surface of as-deposited M-Ir catalysts was mainly composed of metallic state and oxides states, such as metallic Ir, Ni(OH)2 or Co(OH)2, Co(Ir) and Ni(Ir) solid solution, Ir oxides. M-Ir catalysts with low Ir loading exhibited excellent catalytic performance. Ni63.4Ir36.6/CF catalyst with low Ir loading of 1.8 mg·cm−2 achieved a current density of 10 mA·cm2 at an overpotential of 52 mV and a Tafel slope of 36 mV·dec−1. Co64.2Ir35.8/CF catalyst with low Ir loading of 0.7 mg·cm−2 was uniformly scattered with small ellipsoidal particles, looking like fine fluff, requiring an overpotential of 51 mV for hydrogen evolution reaction to reach a current density of 10 mA·cm−2, having a Tafel slope of 38 mV·dec−1. After long-term hydrogen evolution testing, M-Ir/CF catalysts exhibited excellent electrocatalytic stability for water splitting in alkaline solution.
- Subjects
BIMETALLIC catalysts; OXYGEN evolution reactions; HYDROGEN evolution reactions; COPPER; IRIDIUM catalysts; ALKALINE solutions; FOAM; LONG-Term Evolution (Telecommunications)
- Publication
Catalysis Letters, 2024, Vol 154, Issue 7, p3759
- ISSN
1011-372X
- Publication type
Article
- DOI
10.1007/s10562-024-04598-x