| Autor: |
Bai, Yuke, Wu, Yu, Zhou, Xichen, Ye, Yifan, Nie, Kaiqi, Wang, Jiaou, Xie, Miao, Zhang, Zhixue, Liu, Zhaojun, Cheng, Tao, Gao, Chuanbo |
| Předmět: |
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| Zdroj: |
Nature Communications; 10/15/2022, Vol. 13 Issue 1, p1-10, 10p |
| Abstrakt: |
Promoting the formation of high-oxidation-state transition metal species in a hydroxide catalyst may improve its catalytic activity in the oxygen evolution reaction, which remains difficult to achieve with current synthetic strategies. Herein, we present a synthesis of single-layer NiFeB hydroxide nanosheets and demonstrate the efficacy of electron-deficient boron in promoting the formation of high-oxidation-state Ni for improved oxygen evolution activity. Raman spectroscopy, X-ray absorption spectroscopy, and electrochemical analyses show that incorporation of B into a NiFe hydroxide causes a cathodic shift of the Ni2+(OH)2 → Ni3+δOOH transition potential. Density functional theory calculations suggest an elevated oxidation state for Ni and decreased energy barriers for the reaction with the NiFeB hydroxide catalyst. Consequently, a current density of 100 mA cm–2 was achieved in 1 M KOH at an overpotential of 252 mV, placing it among the best Ni-based catalysts for this reaction. This work opens new opportunities in electronic engineering of metal hydroxides (or oxides) for efficient oxygen evolution in water-splitting applications. While water-splitting electrolysis offers a potential renewable means to store energy, the oxygen evolution half-reaction's sluggish kinetics limits performances. Here, authors incorporation boron into nickel-iron hydroxide catalysts to promote electrocatalytic water oxidation activities [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
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