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Electrocatalytic Oxidation of Glycerol to Formic Acid by CuCo2O4 Spinel Oxide Nanostructure Catalysts
Abstract
The electrochemical oxidation of abundantly available glycerol for the production of value-added chemicals, such as formic acid, could be a promising approach to utilize glycerol more effectively and to meet the future demand for formic acid as a fuel for direct or indirect formic acid fuel cells. Here we report a comparative study of a series of earth-abundant cobalt-based spinel oxide (MCo 2 O 4, M = Mn, Fe, Co, Ni, Cu, and Zn) nanostructures as robust electrocatalysts for the glycerol oxidation to selectively produce formic acid. Their intrinsic catalytic activities in alkaline solution follow the sequence of CuCo 2 O 4 > NiCo 2 O 4 > CoCo 2 O 4 > FeCo 2 O 4 > ZnCo 2 O 4 > MnCo 2 O 4 . Using the best-performing CuCo 2 O 4 catalyst directly integrated onto carbon fiber paper electrodes for the bulk electrolysis reaction of glycerol oxidation (pH = 13) at the constant potential of 1.30 V vs reversible hydrogen electrode (RHE), a high selectivity of 80.6% for formic acid production and an overall Faradaic efficiency of 89.1% toward all value-added products were achieved with a high glycerol conversion of 79.7%. Various structural characterization techniques confirm the stability of the CuCo 2 O 4 catalyst after electrochemical testing. These results open up opportunities for studying earth-abundant electrocatalysts for efficient and selective oxidation of glycerol to produce formic acid or other value-added chemicals.
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Metadata
- Authors
- Han, X., Sheng, H., Yu, C., Walker, T. W., Huber, G. W., Qiu, J., & Jin, S.
- Venue
- ACS Catalysis
- Publisher
- American Chemical Society (ACS)
- Published
- 2020-05-22
- Volume
- 10
- Issue
- 12
- Pages
- 6741-6752
- ISSN
- 2155-5435 (ISSN-L)
- OpenAlex
- W3027081978
- Cited by
- 445
- References
- 60
- FWCI
- 9.78
- Type
- journal article
- Language
- en
- Open access
- closed
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