Evaluation of a V8C7 Anode for Oxygen Evolution in Alkaline Media: Unusual Morphological BehaviorClick to copy article linkArticle link copied!
- Kenta KawashimaKenta KawashimaDepartment of Chemistry, The University of Texas at Austin, Austin, Texas 78712, United StatesMore by Kenta Kawashima
- Chi L. CaoChi L. CaoJohn J. McKetta Department of Chemical Engineering, The University of Texas at Austin, Austin, Texas 78712, United StatesMore by Chi L. Cao
- Hao LiHao LiDepartment of Chemistry, The University of Texas at Austin, Austin, Texas 78712, United StatesOden Institute for Computational Engineering and Sciences, The University of Texas at Austin, Austin, Texas 78712, United StatesMore by Hao Li
- Raúl A. Márquez-MontesRaúl A. Márquez-MontesDepartment of Chemistry, The University of Texas at Austin, Austin, Texas 78712, United StatesMore by Raúl A. Márquez-Montes
- Bryan R. WygantBryan R. WygantDepartment of Chemistry, The University of Texas at Austin, Austin, Texas 78712, United StatesMore by Bryan R. Wygant
- Yoon Jun SonYoon Jun SonJohn J. McKetta Department of Chemical Engineering, The University of Texas at Austin, Austin, Texas 78712, United StatesMore by Yoon Jun Son
- Joseph V. GuerreraJoseph V. GuerreraDepartment of Chemistry, The University of Texas at Austin, Austin, Texas 78712, United StatesMore by Joseph V. Guerrera
- Graeme HenkelmanGraeme HenkelmanDepartment of Chemistry, The University of Texas at Austin, Austin, Texas 78712, United StatesOden Institute for Computational Engineering and Sciences, The University of Texas at Austin, Austin, Texas 78712, United StatesMore by Graeme Henkelman
- C. Buddie Mullins*C. Buddie Mullins*Email: [email protected]Department of Chemistry, The University of Texas at Austin, Austin, Texas 78712, United StatesJohn J. McKetta Department of Chemical Engineering, The University of Texas at Austin, Austin, Texas 78712, United StatesCenter for Electrochemistry, The University of Texas at Austin, Austin, Texas 78712, United StatesMore by C. Buddie Mullins
Abstract
Metallic vanadium carbide (V8C7) with cubic symmetry is examined as an oxygen evolution reaction (OER) precatalyst in alkaline media. Herein, we used quasi in situ scanning electron microscopy and energy-dispersive X-ray spectrometry to investigate the structural transformation of the precatalyst V8C7 microparticles during extended cyclic voltammetric (CV) OER testing. Interestingly, an anisotropic morphological transformation (from a distorted sphere to a cuboid) of V8C7 was observed. Our theoretical and experimental results strongly suggest that this morphological change happens due to the selective self-oxidation and dissolution of the V8C7(110) and (111) surfaces and the subsequent exposure of the relatively stable (100), (010), and (001) surfaces. These results also suggest that these stable facets are preferable for the OER, and a current density of 10 mA·cm–2 was delivered at an overpotential of 503 mV after the extended CV OER testing.
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