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Co(OH)2 hollow nanoflowers as highly efficient electrocatalysts for oxygen evolution reaction

  • Hongfei Liu (a1), Dingyi Guo (a1), Wei Zhang (a1) and Rui Cao (a2)

Abstract

Electrocatalytic water splitting for the production of H2 is increasingly becoming a significant method to mitigate the current energy crisis and environmental pollution. However, oxygen evolution reaction (OER), a slow four-electron progress, is the bottle neck of water splitting. Thus, developing new, low cost, and effective catalysts for OER is a research hotspot in material and energy resource fields. Therefore, the research of nonprecious, metal-based OER catalysts has been popular. In this work, it is validated that 3D hollow Co(OH)2 nanoflowers synthesized by a facile template-based strategy at room temperature are effective electrocatalysts for OER. The catalysts display high activity with a current density of 10 mA/cm2 at an overpotential of 310 mV and a small Tafel slope of 68.9 mV/dec in alkaline condition. It’s noteworthy that this material is stable for over 20 h of chronopotentiometry. This work offers a simple and promising way to prepare efficient and durable electrocatalysts.

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Copyright

Corresponding author

a) Address all correspondence to these authors. e-mail: zw@snnu.edu.cn
b) e-mail: ruicao@ruc.edu.cn

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c)

These authors contributed equally to this work.

Contributing Editor: Yao Zheng

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References

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