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Pyrolysis of a self-supported dodecyl sulfate anion-intercalated Co(OH)2 nanosheet with enlarged amorphous phase content toward enhanced activity for alkaline water oxidation

Abstract

Highly-active electrocatalysts made of earth-abundant elements are vital for efficient and cost-effective energy storage and conversion systems. In this communication, we report the further amorphization of a solvothermally synthesized dodecyl sulfate anions-intercalated cobalt hydroxide nanosheet array on nickel foam (DS-Co(OH)2/NF) via pyrolysis. Owing to the greatly enlarged interlayer distance of DS-Co(OH)2/NF precursor (2.4 nm), and more exposed active sites by enlarged amorphous phase content, the resulting P-DS-Co(OH)2/NF exhibits boosted activity as a 3D catalyst electrode for alkaline water oxidation. In 1.0 M KOH, it needs an overpotential of only 266 mV to drive a geometrical catalytic current density of 70 mA cm−2, 74 and 121 mV lower than those for DS-Co(OH)2/NF precursor and Co(OH)2 without DS anion intercalating (Co(OH)2/NF), respectively. Impressively, this catalyst also displays superior long-term stability with a high turnover frequency value of 0.055 O2 s-1 at an overpotential of 340 mV.

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Publication details

The article was accepted on 14 Aug 2019 and first published on 14 Aug 2019


Article type: Communication
DOI: 10.1039/C9CC06065K
Chem. Commun., 2019, Accepted Manuscript

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    Pyrolysis of a self-supported dodecyl sulfate anion-intercalated Co(OH)2 nanosheet with enlarged amorphous phase content toward enhanced activity for alkaline water oxidation

    X. Sun, G. Zhu, L. Yang, D. Zheng, J. Zhang, H. Wen, H. Feng, X. Guan, H. Wang and Y. yao, Chem. Commun., 2019, Accepted Manuscript , DOI: 10.1039/C9CC06065K

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