| Autor: |
Kong, Lingtao, Li, Zhouxun, Zhang, Hui, Zhang, Mengmeng, Zhu, Jiaxing, Deng, Mingli, Chen, Zhenxia, Ling, Yun, Zhou, Yaming |
| Zdroj: |
Frontiers of Chemical Science & Engineering; Jul2022, Vol. 16 Issue 7, p1114-1124, 11p |
| Abstrakt: |
Improvement of the low-cost transition metal electrocatalyst used in sluggish oxygen evolution reaction is a significant but challenging problem. In this study, ultrafine Fe-modulated Ni nanoparticles embedded in a porous Ni-doped carbon matrix were produced by the pyrolysis of zirconium metal-organic-frameworks, in which 2,2′-bipyridine-5,5′-dicarboxylate operating as a ligand can coordinate with Ni2+ and Fe3+. This strategy allows formation of Fe-modulated Ni nanoparticles with a uniform dimension of about 2 nm which can be ascribed to the spatial blocking effect of ZrO2. This unique catalyst displays an efficient oxygen evolution reaction electro-catalytic activity with a low overpotential of 372 mV at 10 mA·cm−2 and a small Tafel slope of 84.4 mV·dec−1 in alkaline media. More importantly, it shows superior durability and structural stability after 43 h in a chronoamperometry test. Meanwhile, it shows excellent cycling stability during 4000 cyclic voltammetry cycles. This research offers a new insight into the construction of uniform nanoscale transition metals and their alloys as highly efficient and durable electrocatalysts. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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