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Characterization of Bulk and Surface Composition of CoxNi1-xOy Mixed Oxides for Electrocatalysis
Abstract
Films of general composition Co x Ni 1 - x O y with x = 0, 11.1, 22.2, 33.3, 44.4, 55.6, 66.7, 77.8, 88.9, and 100 mol %, prepared by thermal decomposition of 2-propanol solutions of Ni and Co nitrates on Ni supports, have been characterized by X-ray diffraction (XRD), infrared spectroscopy (IRS), and X-ray photoelectron spectroscopy (XPS). These techniques have provided the surface chemical composition, the crystalline structure, and the oxidation state of Co and Ni in the bulk as well as on the surface. The results have revealed, in addition to previous work where NiO and Ni x Co 2 - x O 4 solid solutions were found to be the predominant crystalline phases, that Ni and Co hydroxides interact in the surface layer of nanosized crystallites of the oxide phase. The interaction in the hydroxylated surface has a redox character and results in two oxidation states (+2 and +3) for both Ni and Co ions. This work has shown that Co hydroxide fragments are localized in the periphery of Ni hydroxide domains. The redox interaction between the hydroxides prevents Ni ions from being oxidized to higher valency states in anodic electrocatalytic processes, which results in improved anodic corrosion stability of Ni + Co mixed oxides.
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Cited by
Bao, J., Zhang, X., Fan, B., Zhang, J., Zhou, M., Yang, W., Hu, X., Wang, H., Pan, B., & Xie, Y. (2015) · Angewandte Chemie International Edition · doi:10.1002/anie.201502226 · Cited by 1,428
Li, J., Xiong, S., Liu, Y., Ju, Z., & Qian, Y. (2013) · ACS Applied Materials & Interfaces · doi:10.1021/am3026294 · Cited by 759
Zhong, J.-H., Wang, A.-L., Li, G.-R., Wang, J.-W., Ou, Y.-N., & Tong, Y.-X. (2012) · Journal of Materials Chemistry · doi:10.1039/c2jm15863a · Cited by 510
Prabu, M., Ketpang, K., & Shanmugam, S. (2014) · Nanoscale · doi:10.1039/c3nr05835b · Cited by 420
Cheng, G., Kou, T., Zhang, J., Si, C., Gao, H., & Zhang, Z. (2017) · Nano Energy · doi:10.1016/j.nanoen.2017.05.043 · Cited by 349
Metadata
- Authors
- Roginskaya, Y. E., Morozova, O. V., Lubnin, E. N., Ulitina, Y. E., Lopukhova, G. V., & Trasatti, S.
- Venue
- Langmuir
- Publisher
- American Chemical Society (ACS)
- Published
- 1997-08-01
- Volume
- 13
- Issue
- 17
- Pages
- 4621-4627
- ISSN
- 0743-7463 (ISSN-L)
- 1520-5827
- OpenAlex
- W2077998316
- Cited by
- 325
- References
- 0
- FWCI
- 3.75
- Type
- journal article
- Language
- en
- Open access
- closed
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- Roginskaya, Y. E., Morozova, O. V., Lubnin, E. N., Ulitina, Y. E., Lopukhova, G. V., & Trasatti, S. (1997). Characterization of Bulk and Surface Composition of CoxNi1-xOy Mixed Oxides for Electrocatalysis. Langmuir. https://doi.org/10.1021/la9609128
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