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Rational Lattice Engineering of Spinel CoxRh3-xO4 Solid Solution Expediting Oxygen Evolution Reaction
- Title
- Rational Lattice Engineering of Spinel CoxRh3-xO4 Solid Solution Expediting Oxygen Evolution Reaction
- Authors
- Woo; Hyerim; Kwon; Taehui; Prabhakaran; Sampath; Lee; Youngmi; Kim; Do Hwan; Myung Hwa
- Ewha Authors
- 이영미; 김명화
- SCOPUS Author ID
- 이영미; 김명화
- Issue Date
- 2023
- Journal Title
- ACS Sustainable Chemistry and Engineering
- ISSN
- 2168-0485
- Citation
- ACS Sustainable Chemistry and Engineering vol. 11, no. 45, pp. 16205 - 16216
- Keywords
- Acid−base reaction; Density functional theory (DFT) simulation; Oxygen evolution reaction (OER); Spinel Co<sub>x</sub>Rh<sub>3−x</sub>O<sub>4</sub>
- Publisher
- American Chemical Society
- Indexed
- SCIE; SCOPUS
- Document Type
- Article
- Abstract
- Electrochemical water splitting holds great promise as a viable method to produce a sustainable hydrogen fuel. Spinel crystal structure (AB2O4) is regarded as a promising electrocatalyst for the anodic oxygen evolution reaction (OER) of water electrolysis. Fine-tuning of metal cations’ composition at the tetrahedral (A) and octahedral (B) sites within the well-defined spinel structure plays a critical role in determining the electroactivities for electrochemical reactions, including the OER. Herein, we report the rational incorporation of rhodium ions into the B sites of the spinel lattice of Co3O4 to form the CoxRh3-xO4 solid solution via an ecofriendly acid-base reaction between metal (Co, Rh) chlorides and NaOH in an aqueous solution, followed by the thermal annealing process. Among the CoxRh3-xO4 series, Co1.47Rh1.53O4 nanoparticles represented superior OER catalytic performances in alkaline conditions, verified by the lowest onset potential, small Tafel slope, and excellent long-term stability. The combination of experimental data with theoretical simulations suggests that the moderate d-band center (ϵd) energy levels are responsible for the enhanced activity by tuning the adsorption and desorption strengths of oxygen-containing intermediates, such as *OH, *O, and *OOH species. Our findings introduce a straightforward and environmentally friendly synthetic methodology for a single phase of spinel Co1.47Rh1.53O4 nanoparticles, resulting in a rational lattice structure that can be applied as an effective OER catalyst electrode. © 2023 American Chemical Society
- DOI
- 10.1021/acssuschemeng.3c04304
- Appears in Collections:
- 자연과학대학 > 화학·나노과학전공 > Journal papers
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