title: Targeted Synthesis of Unique Nickel Sulfide (NiS, NiS2) Microarchitectures and the Applications for the Enhanced Water Splitting System.
abstract: Water splitting is one of the ideal technologies to meet the ever increasing demands of energy. Many materials have aroused great attention in this field. The family of nickel-based sulfides is one of the examples that possesses interesting properties in water-splitting fields. In this paper, a controllable and simple strategy to synthesize nickel sulfides was proposed. First, we fabricated NiS2hollow microspheres via a hydrothermal process. After a precise heat control in a specific atmosphere, NiS porous hollow microspheres were prepared. NiS2was applied in hydrogen evolution reaction (HER) and shows a marvelous performance both in acid medium (an overpotential of 174 mV to achieve a current density of 10 mA/cm2and the Tafel slope is only 63 mV/dec) and in alkaline medium (an overpotential of 148 mV to afford a current density of 10 mA/cm2and the Tafel slope is 79 mV/dec). NiS was used in oxygen evolution reaction (OER) showing a low overpotential of 320 mV to deliver a current density of 10 mA/cm2, which is meritorious. These results enlighten us to make an efficient water-splitting system, including NiS2as HER catalyst in a cathode and NiS as OER catalyst in an anode. The system shows high activity and good stabilization. Specifically, it displays a stable current density of 10 mA/cm2with the applying voltage of 1.58 V, which is a considerable electrolyzer for water splitting.
authors.affiliation: The State Key Laboratory of Mechanical Transmissions and School of Chemistry and Chemical Engineering and ‡College of Aerospace Engineering, Chongqing University , Chongqing 400044, China.
authors.forename: Pan
authors.initials: P
authors.lastname: Luo
authors.affiliation: The State Key Laboratory of Mechanical Transmissions and School of Chemistry and Chemical Engineering and ‡College of Aerospace Engineering, Chongqing University , Chongqing 400044, China.
authors.forename: Huijuan
authors.initials: H
authors.lastname: Zhang
authors.affiliation: The State Key Laboratory of Mechanical Transmissions and School of Chemistry and Chemical Engineering and ‡College of Aerospace Engineering, Chongqing University , Chongqing 400044, China.
authors.forename: Li
authors.initials: L
authors.lastname: Liu
authors.affiliation: The State Key Laboratory of Mechanical Transmissions and School of Chemistry and Chemical Engineering and ‡College of Aerospace Engineering, Chongqing University , Chongqing 400044, China.
authors.forename: Yan
authors.initials: Y
authors.lastname: Zhang
authors.affiliation: The State Key Laboratory of Mechanical Transmissions and School of Chemistry and Chemical Engineering and ‡College of Aerospace Engineering, Chongqing University , Chongqing 400044, China.
authors.forename: Ju
authors.initials: J
authors.lastname: Deng
authors.affiliation: The State Key Laboratory of Mechanical Transmissions and School of Chemistry and Chemical Engineering and ‡College of Aerospace Engineering, Chongqing University , Chongqing 400044, China.
authors.forename: Chaohe
authors.initials: C
authors.lastname: Xu
authors.affiliation: The State Key Laboratory of Mechanical Transmissions and School of Chemistry and Chemical Engineering and ‡College of Aerospace Engineering, Chongqing University , Chongqing 400044, China.
authors.forename: Ning
authors.initials: N
authors.lastname: Hu
authors.affiliation: The State Key Laboratory of Mechanical Transmissions and School of Chemistry and Chemical Engineering and ‡College of Aerospace Engineering, Chongqing University , Chongqing 400044, China.
authors.forename: Yu
authors.identifier: http://orcid.org/0000-0003-2883-1087
authors.initials: Y
authors.lastname: Wang
keywords: hollow microspheres; hydrogen evolution reaction; nickel sulfides; overall synthesized strategy; oxygen evolution reaction; water splitting system