Electrochemically Identified Ultrathin Water-Oxidation Catalyst in Neutral pH Solution Containing Ni2+ and Its Combination with Photoelectrode
- Authors
- Cho, Sung Ki; Chang, Jinho
- Issue Date
- Feb-2017
- Publisher
- AMER CHEMICAL SOC
- Citation
- ACS OMEGA, v.2, no.2, pp 432 - 442
- Pages
- 11
- Journal Title
- ACS OMEGA
- Volume
- 2
- Number
- 2
- Start Page
- 432
- End Page
- 442
- URI
- https://scholarworks.bwise.kr/kumoh/handle/2020.sw.kumoh/26987
- DOI
- 10.1021/acsomega.6b00448
- ISSN
- 2470-1343
- Abstract
- Water oxidation electrocatalyzed by Ni2+ under neutral conditions was investigated using various electrochemical analyses. The addition of Ni2+ in a phosphatebuffered solution catalyzed the oxidation of water, as confirmed by the detection of oxygen generation via scanning electrochemical microscopy. A combination of cyclic voltammetry, coulometric titration, and electrochemical quartz microbalance measurements identified the catalysis as heterogeneous and the catalyst as a Ni-based ultrathin (< 4 nm) layer ("Ni-Pi"). Analysis of the potential-and pHdependency of the titrated amount of charge revealed that the catalyst was deposited only under anodic polarization conditions and was removed under unpolarized conditions; the catalyst may be Ni( III) oxide, and its formation and oxidation appeared to be chemically irreversible. The diffusion-limited nature of water oxidation catalyzed by Ni2+ was closely related to the phosphate ions involved in the catalyst formation and the accompanying catalysis. Although the catalytic performance of Ni2+ alone was not remarkable, it exhibited a synergetic effect with BiVO4 for photoelectrochemical water oxidation, which can compete with Co-Pidecorated BiVO4.
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