Journal
JOURNAL OF COLLOID AND INTERFACE SCIENCE
Volume 606, Issue -, Pages 518-525Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2021.08.037
Keywords
Oxygen evolution reaction; Electrodeposition; Nickel iron hydroxide; Iron hydroxide colloidal particle; Electron-transfer
Categories
Funding
- National Natural Science Foundation of China [21773311, 21972169, 21473257]
- Fundamental Research Funds for the Central Universities of Central South University [2019zzts125]
- Hunan Provincial Science and Technology Plan Project, China [2019TP1001]
- National Science Foundation [CHE-1900235]
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Negatively charged iron (III) hydroxide colloidal particles significantly enhance the OER activity of NiFeOH in alkaline media. NiFeOH@C-1000 exhibits a 40-fold enhancement of the OER activity, likely due to enhanced charge transfer and facilitated adsorption of key reaction intermediates.
Nickel iron hydroxides (NiFeOH) have been drawing enormous attention as effective catalysts for oxygen evolution reaction (OER), a key process in water splitting. Herein, we report that negatively charged iron (III) hydroxide colloidal particles, can significantly enhance the OER activity of NiFeOH in alkaline media. NiFeOH is grown on nickel foam in a supersaturated iron(III) salt solution, which also contains a high content of Fe(OH)(3) colloidal nanoparticles, forming free-standing NiFeOH@C-x electrodes (with x being the Fe (OH)(3) concentration). The interface between NiFeOH and Fe(OH)(3) colloidal particles, as manifested by the unique volcano-like holes on the NiFeOH@C-x surface, is likely the OER active sites. In comparison to Fe (OH)(3)-free NiFeOH, NiFeOH@C-1000 exhibits a 40-fold enhancement of the OER activity, confirming the significant effect of Fe(OH)(3) colloidal nanoparticles in boosting the OER activity, likely as a result of enhanced charge transfer from Ni2+ to Fe3+ that facilitates the adsorption of key reaction intermediates. Furthermore, by coupling the free-standing NiFeOH@C-1000 electrode with commercial Pt/C, full water splitting can occur and reach a current density of 10 mA cm(-2) under a cell voltage of 1.51 V, which is lower than that (1.59 V) based on noble metal catalysts of RuO2 + Pt/C. (C) 2021 Elsevier Inc. All rights reserved.
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