A simple method for the preparation of a nickel selenide and cobalt selenide mixed catalyst to enhance bifunctional oxygen activity for Zn–air batteries

Abstract

The mixture Ni0.85Se/Co0.85Se-NHCS-2 displayed superior electrocatalytic performance to that of Ni0.85Se-NHCS or Co0.85Se-NHCS alone. This provided a simple approach to develop ORR/OER bifunctional electrocatalysts for zinc–air batteries.

Developing Outstanding Bifunctional Electrocatalysts for Rechargeable Zn‐Air Batteries Using High‐Purity Spinel‐Type ZnCo2Se4 Nanoparticles

“…However, studies showed that metal selenides possess low electron conductivity and stability in energy-based applications. [19][20][21] Based on the above context, carbon nanofillers including graphene oxide, [22,23,24] carbon frameworks, [25] and carbon nanofibers [26] can be used to increase the electron conductivity of metal selenides. The highest electron conductivity and largest surface area of all carbon conductive fillers were found in graphene sheets, which also prevents the accumulation of metal selenides.…”

Ce-Doped NiSe Nanosheets on Carbon Cloth for Electrochemical Water-Splitting

“…The 2D nanosheets of Ni 0.85 Se are made up of hexagonal structures, as seen in Figure S14a, which is well corroborated to FESEM analysis. The HRTEM image in Figure S14b represents the d spacing of 0.26 nm, which is well indexed with the (101) plane of the Ni 0.85 Se lattice . The crystalline nature of pristine Ni 0.85 Se is confirmed through SAED analysis in Figure S14c; the bright spots are clearly visible due to the crystallinity and lattice planes of the Ni 0.85 Se.…”

“…The HRTEM image in Figure S14b represents the d spacing of 0.26 nm, which is well indexed with the (101) plane of the Ni 0.85 Se lattice. 52 The crystalline nature of pristine Ni 0.85 Se is confirmed through SAED analysis in Figure S14c; the bright spots are clearly visible due to the crystallinity and lattice planes of the Ni 0.85 Se. Introduction of the Ce dopant reduces the thickness of 2D nanosheets of Ni 0.85 Se, as shown in Figure 4a,b, which is well corroborated with FESEM.…”

A NiCu–MoS2 electrocatalyst for pH-universal hydrogen evolution reaction and Zn–air batteries driven self-power water splitting

“…22,23 As a result, various transition metal-based catalysts viz. selenides, 24,25 suldes, 26,27 borides, 28,29 nitrides, 30,31 phosphides, 32,33 and oxides 34 have been explored in the past. Despite signicant progress, most of these catalysts showed favorable activity for one particular reaction, but when used as a bifunctional or trifunctional catalyst, they failed to achieve an equivalent activity to advanced noble-metal catalysts.…”