Hierarchical MnCo2O4 nanowire@NiFe layered double hydroxide nanosheet heterostructures on Ni foam for overall water splitting. Issue 40 (24th September 2021)

• Record Type: Journal Article
• Authors: Shi, Huafeng; Yang, Kun; Wang, Fangfang; Ni, Yonghong; Zhai, Muheng
• Is Part Of: CrystEngComm. Volume 23:Issue 40(2021)
• Page Start: 7141
• Page End: 7150
• Publication Date: 2021-09-24
• Subjects: Crystals -- Periodicals; Crystal growth -- Periodicals; Crystallography -- Periodicals; Cristaux -- Périodiques; Cristaux -- Croissance -- Périodiques; Cristallographie -- Périodiques; 548
• DOI: 10.1039/d1ce01037a
• Languages: English
• ISSNs: 1466-8033

Abstract

Abstract : It is of great importance to construct non-precious metal bifunctional electrocatalysts with low cost and high efficiency 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 MnCo2 O4 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.