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Fe incorporated α-Co(OH)2 nanosheets with remarkably improved activity towards the oxygen evolution reaction

Fe incorporated α-Co(OH)2 nanosheets with remarkably improved activity towards the oxygen... Cost-effective and highly active electrocatalysts for the oxygen evolution reaction (OER) are critical to energy conversion and storage processes. Herein, a superior OER catalyst of Fe substituted α-Co(OH)2 (α-Co1−mFem(OH)2) has been synthesized by taking advantage of the large layered structure and good conductivity of α-Co(OH)2, in conjunction with the rich redox properties and abundance of Fe. The atomically layered α-Co4Fe(OH)x (Co/Fe = 4) nanoplates could effectively catalyze water oxidation at the onset potential of 0.26 V and its turnover frequency (TOF) was 11 and 5 times higher than those of α-Co(OH)2 and IrO2, respectively. The increased activity could be attributed to strong electronic interactions between Co and Fe. Density functional theory (DFT) calculations also demonstrated that the theoretical overpotential of α-Co1−mFem(OH)2 is obviously lower than that of α-Co(OH)2 and thus Fe doped α-Co(OH)2 displays a better activity. Moreover, the correlation between the Fe content and activity could be plotted as a volcano curve. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Materials Chemistry A Royal Society of Chemistry

Fe incorporated α-Co(OH)2 nanosheets with remarkably improved activity towards the oxygen evolution reaction

Jin, Haiyan; Mao, Shanjun; Zhan, Guopeng; Xu, Fan; Bao, Xiaobing; Wang, Yong
Royal Society of Chemistry — Jan 17, 2017
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Abstract

Cost-effective and highly active electrocatalysts for the oxygen evolution reaction (OER) are critical to energy conversion and storage processes. Herein, a superior OER catalyst of Fe substituted α-Co(OH)2 (α-Co1−mFem(OH)2) has been synthesized by taking advantage of the large layered structure and good conductivity of α-Co(OH)2, in conjunction with the rich redox properties and abundance of Fe. The atomically layered α-Co4Fe(OH)x (Co/Fe = 4) nanoplates could effectively catalyze water oxidation at the onset potential of 0.26 V and its turnover frequency (TOF) was 11 and 5 times higher than those of α-Co(OH)2 and IrO2, respectively. The increased activity could be attributed to strong electronic interactions between Co and Fe. Density functional theory (DFT) calculations also demonstrated that the theoretical overpotential of α-Co1−mFem(OH)2 is obviously lower than that of α-Co(OH)2 and thus Fe doped α-Co(OH)2 displays a better activity. Moreover, the correlation between the Fe content and activity could be plotted as a volcano curve.

Journal

Journal of Materials Chemistry A – Royal Society of Chemistry

Published: Jan 17, 2017

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