Issue 40, 2021

Hierarchical MnCo2O4 nanowire@NiFe layered double hydroxide nanosheet heterostructures on Ni foam for overall water splitting

Abstract

It is of great importance to construct non-precious metal bifunctional electrocatalysts with low cost and high efficiency for overall water splitting. In this work, a nickel foam (NF) supported hierarchical MnCo2O4 nanowire@NiFe layered double hydroxide (LDH) heterostructure (labeled as MCO@NiFe-LDH/NF) was constructed using a hydrothermal-annealing-hydrothermal route. Electrochemical tests showed that the as-constructed MCO@NiFe-LDH/NF could be used as an integral electrode for both hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) in 1 M KOH electrolyte. To get the current density of −10 mA cm−2 for HER or 100 mA cm−2 for OER, an overpotential of 129/283 mV was separately required. In a two-electrode system with MCO@NiFe-LDH/NF as both the anode and cathode, 1.55/1.705 V of cell voltage was needed to reach current density of 10/100 mA cm−2. More importantly, the as-constructed integral electrode could continuously catalyze for 200 h, full water splitting at the current density of 50 mA cm−2, demonstrating prominent long-term stability.

Graphical abstract: Hierarchical MnCo2O4 nanowire@NiFe layered double hydroxide nanosheet heterostructures on Ni foam for overall water splitting

Supplementary files

Article information

Article type
Paper
Submitted
06 Aug. 2021
Accepted
21 Aug. 2021
First published
07 Sept. 2021

CrystEngComm, 2021,23, 7141-7150

Hierarchical MnCo2O4 nanowire@NiFe layered double hydroxide nanosheet heterostructures on Ni foam for overall water splitting

H. Shi, K. Yang, F. Wang, Y. Ni and M. Zhai, CrystEngComm, 2021, 23, 7141 DOI: 10.1039/D1CE01037A

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