NiFe2 O4 Nanoparticles/NiFe Layered Double-Hydroxide Nanosheet Heterostructure Array for Efficient Overall Water Splitting at Large Current Densities

ACS Applied Materials & Interfaces
Zhengcui WuFeng Gao

Abstract

Constructing catalysts with new and optimizational chemical components and structures, which can operate well for both the anodic oxygen evolution reaction (OER) and the cathodic hydrogen evolution reaction (HER) at large current densities, is of primary importance in practical water splitting technology. Herein, the NiFe2O4 nanoparticles/NiFe layered double hydroxide (LDH) nanosheet heterostructure array on Ni foam was prepared via a simple one-step solvothermal approach. The as-prepared heterostructure array displays high catalytic activity toward the OER with a small overpotential of 213 mV at 100 mA cm-2 and can afford a current density of 500 mA cm-2 at an overpotential of 242 mV and 1000 mA cm-2 at 265 mV. Moreover, it also presents outstanding HER activity, only needing a small overpotential of 101 mV at 10 mA cm-2, and can drive large current densities of 500 and 750 mA cm-2 at individual overpotentials of 297 and 314 mV. A two-electrode electrolyzer using NiFe2O4 nanoparticles/NiFe LDH nanosheets as both the anode and the cathode implements active overall water splitting, demanding a low voltage of 1.535 V to drive 10 mA cm-2, and can deliver 500 mA cm-2 at 1.932 V. The NiFe2O4 nanoparticles/NiFe LDH nanosheet array el...Continue Reading

References

May 25, 2013·Journal of the American Chemical Society·Ming GongHongjie Dai
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Citations

Dec 19, 2018·Dalton Transactions : an International Journal of Inorganic Chemistry·Shunichi FukuzumiWonwoo Nam
Mar 12, 2020·Research : a Science Partner Journal·Libo WuZhifeng Ren
Oct 29, 2019·Chemical Reviews·Jing ZhuKwok-Yin Wong
Nov 13, 2021·ACS Applied Materials & Interfaces·Li ZhongShaoming Huang

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