Self-Supported Defect-Rich Au-Based Nanostructures as Robust Bifunctional Catalysts for the Methanol Oxidation Reaction and Oxygen Reduction Reaction in an Alkaline Medium
| Autor: | Xiu Liang, Guanchen Xu, Dongwei Li, Yuanyuan Tao, Yingzhou Chen, Hongyu Gong, Yong Li, Xifeng Jiang, Na Zhang |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
oxygen reduction reaction
Materials science Nanostructure General Chemical Engineering electrochemical Cu removal Electrochemistry Electrocatalyst Redox Article AuCu alloy surface defects Catalysis Chemistry chemistry.chemical_compound Chemical engineering chemistry methanol oxidation reaction General Materials Science Methanol Bifunctional QD1-999 Methanol fuel |
| Zdroj: | Nanomaterials Volume 11 Issue 9 Nanomaterials, Vol 11, Iss 2193, p 2193 (2021) |
| ISSN: | 2079-4991 |
| DOI: | 10.3390/nano11092193 |
| Popis: | Recently, alkaline direct methanol fuel cells have made great progress with the development of alkaline electrocatalysis, and a wide variety of catalysts have been explored for methanol oxidation reaction (MOR)and oxygen reduction reaction (ORR). However, the slow kinetics of the MOR and ORR remain a great challenge. In this paper, self-supported defect-rich AuCu was obtained by a convenient one-pot strategy. Self-supported AuCu presented a branched, porous nanostructure. The nanobranch consisted of several 13 nm skeletons, which connected in the kink of the structure. Different growth directions co-existed at the kink, and the twin boundaries and dislocations as defects were observed. When the Au-based nanostructure functioned as an electrocatalyst, it showed robust MOR and ORR performance. For the MOR, the forward peak current was 2.68 times greater than that of Au/C for the ORR, the activity was close to that of Pt/C and significantly better than that of Au/C. In addition, it possessed superior electrochemical stability for MOR and ORR. Finally, an in-depth exploration of the impact of surface defects and electrochemical Cu removal on MOR and ORR activity was carried out to explain the MOR and ORR’s catalytic performance. |
| Databáze: | OpenAIRE |
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