Uniquely integrated Fe-doped Ni(OH)2 nanosheets for highly efficient oxygen and hydrogen evolution reactions

Nanoscale
Jin-Tao RenZhong-Yong Yuan

Abstract

Developing high-efficiency electrocatalysts for both oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) is vital for the production of hydrogen on a large scale by electrocatalytic splitting of water. Herein, Fe-doped Ni(OH)2 nanosheets directly grown on commercial Ni foam (FeNiOH/NF) were fabricated through a facile hydrothermal method in (NH4)2S2O8 aqueous solution containing iron salts. The integrated architecture with hierarchical pores is beneficial for exposing sufficient catalytically active sites and providing evaluated structural and electrical properties. In particular, the Fe-induced partial-charge-transfer greatly modifies the electronic structure of Ni(OH)2, which evidently promotes the electrocatalytic activity of the as-fabricated FeNiOH/NF for OER and HER. Thus, as an electrocatalyst for OER, FeNiOH/NF exhibits excellent activity with overpotentials of 271 and 318 mV to deliver current densities of 20 and 100 mA cm-2, respectively, with a small Tafel slope of 72 mV dec-1 in 1.0 M KOH, demonstrating the very high level of novelty and sufficient improvement over the current state-of-the-art IrO2 electrocatalyst. Most importantly, there is an increase in overpotential by only 23 mV during continu...Continue Reading

References

May 2, 2014·Journal of the American Chemical Society·Lena TrotochaudShannon W Boettcher
Jun 11, 2014·Langmuir : the ACS Journal of Surfaces and Colloids·Yang QiuWenzhen Li
Jan 7, 2015·Journal of the American Chemical Society·Daniel FriebelAlexis T Bell
Mar 26, 2016·Science·Bo ZhangEdward H Sargent

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Citations

Sep 3, 2019·Angewandte Chemie·Guanzhi WangYang Yang
Mar 24, 2020·ChemSusChem·Xian-Wei LvZhong-Yong Yuan
Feb 3, 2019·The Journal of Chemical Physics·Jonathan Rodríguez-FernándezJeppe V Lauritsen
Dec 10, 2019·ACS Applied Materials & Interfaces·Miao GaoWen-Wei Li
Dec 10, 2019·Inorganic Chemistry·Sengeni AnantharajSubrata Kundu

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Methods Mentioned

BETA
X-ray
delamination

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