| Autor: |
Teng Chen, Yida Xu, Siqi Guo, Dali Wei, Luming Peng, Xuefeng Guo, Nianhua Xue, Yan Zhu, Zhaoxu Chen, Bin Zhao, Weiping Ding |
| Jazyk: |
angličtina |
| Rok vydání: |
2019 |
| Předmět: |
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| Zdroj: |
iScience, Vol 11, Iss , Pp 388-397 (2019) |
| Druh dokumentu: |
article |
| ISSN: |
2589-0042 |
| DOI: |
10.1016/j.isci.2018.12.029 |
| Popis: |
Summary: We report here a supercatalyst for oxygen reduction of Pt/CNx/Ni in a unique ternary heterostructure, in which the Pt and the underlying Ni nanoparticles are separated by two to three layers of nitrogen-doped carbon (CNx), which mediates the transfer of electrons from the inner Ni to the outer Pt and protects the Ni against corrosion at the same time. The well-engineered low-Pt catalyst shows ∼780% enhanced specific mass activity or 490% enhanced specific surface activity compared with a commercial Pt/C catalyst toward oxygen reduction. More importantly, the exceptionally strong tune on the Pt by the unique structure makes the catalyst superbly stable, and its mass activity of 0.72 A/mgPt at 0.90 V (well above the US Department of Energy's 2020 target of 0.44 A/mgPt at 0.90 V) after 50,000 cyclic voltammetry cycles under acidic conditions is still better than that of the fresh commercial catalyst. : Catalysis; Electrochemical Energy Conversion; Energy Materials Subject Areas: Catalysis, Electrochemical Energy Conversion, Energy Materials |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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