Spherical Ni/Ni₃Se₂ Heterostructure for Efficient Electrochemical Oxidation Reactions

Abstract

A Ni/Ni 3 Se 2 metal-semiconductor heterojunction catalyst with a sphere structure was prepared by a hydrothermal and hydrogen reduction method. The results showed that the heterostructure Ni/Ni 3 Se 2 exhibits better performance than Ni 3 Se 2 and Ni counterparts for electrochemical oxidation reactions. During electrocatalytic water oxidation, the overpotential is 340 mV to reach a catalytic current density of 10 mA cm À 2 in 1.0 M KOH solution. The heterogeneous interface formed between the metal Ni and Ni 3 Se 2 in the Ni/Ni 3 Se 2 catalyst can accelerate the electron transfer in the electrochemical oxidation process. Moreover, the asprepared material is also applied for sulfonamide degradation, with the aid from hydroxyl radicals generated during water oxidation. This application is meaningful since the product from water oxidation is not desired in hydrogen production from water electrolysis. The material with heterojunctions delivered degradation efficiency up to 80% of sulfonamide antibiotics within 2 h. Therefore, the Ni/Ni 3 Se 2 material might have application prospects in electrochemical sustainability research.

Heterostructured NiSe2/MoSe2 electronic modulation for efficient electrocatalysis in urea assisted water splitting reaction

“…Among them, nickel selenide has attracted great attention recently due to the varied electronic configuration, diverse components, and flexible composition for structure tunning, while efforts are still required to improve their intrinsic activity and tolerance during the catalysis reaction process to make them more competitive in the commercial market [11][12][13][14]. Some strategies were proposed to rationally enhance the catalytic performance by changing the electronic structure and rearranging the valence electrons, including doping, defecting, facet tunning, or interface engineering [15][16][17].…”

In situcoupling of a Co–Mo bimetallic sulfide derived from [CoMo12O40]6−clusters showing highly efficient electrocatalytic hydrogen evolution

“…[44][45][46][47] Therefore, coupling nano-composite materials onto carbon cloth to create a new self-supporting electrode and applying it to the electrocatalytic HER represents a significant contribution. [50][51][52][53][54][55] Herein, we report the fabrication of an isometallic sulfide MoS 2 /CoS 2 /CC catalyst via hydrothermal sulfurization of the CoMo 12 POMs in this paper. The electrocatalytic properties of the catalyst were studied.…”

“…44–47 Therefore, coupling nano-composite materials onto carbon cloth to create a new self-supporting electrode and applying it to the electrocatalytic HER represents a significant contribution. 50–55…”