NiFe (Oxy) Hydroxides Derived from NiFe Disulfides as an Efficient Oxygen Evolution Catalyst for Rechargeable Zn-Air Batteries: The Effect of Surface S Residues

Advanced Materials
Tanyuan WangJaephil Cho

Abstract

A facile H2 O2 oxidation treatment to tune the properties of metal disulfides for oxygen evolution reaction (OER) activity enhancement is introduced. With this method, the degree of oxidation can be readily controlled and the effect of surface S residues in the resulted metal (oxy)hydroxides for the OER is revealed for the first time. The developed NiFe (oxy)hydroxide catalyst with residual S demonstrates an extraordinarily low OER overpotential of 190 mV at the current density of 10 mA cm-2 after coupling with carbon nanotubes, and outstanding performance in Zn-air battery tests. Theoretical calculation suggests that the surface S residues can significantly reduce the adsorption free energy difference between O* and OH* intermediates on the Fe sites, which should account for the high OER activity of NiFe (oxy)hydroxide catalysts. This work provides significant insight regarding the effect of surface heteroatom residues in OER electrocatalysis and offers a new strategy to design high-performance and cost-efficient OER catalysts.

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Citations

Nov 6, 2018·Advanced Materials·Jaechan RyuJaephil Cho
Mar 14, 2019·Chemical Communications : Chem Comm·Weili XinJin-Song Hu
Jan 16, 2020·Nature Communications·Wu-Jun LiuHan-Qing Yu
Feb 18, 2021·ACS Applied Materials & Interfaces·Zehao ZangZunming Lu
Mar 30, 2021·Journal of Colloid and Interface Science·Ya TanYuwei Long
Jul 16, 2021·ACS Applied Materials & Interfaces·Ya-Nan ZhouYong-Ming Chai
Sep 17, 2021·Dalton Transactions : an International Journal of Inorganic Chemistry·Lei YeYaqiong Gong

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