Influence of the S:Ni ratio in raw materials on the NixSy electrocatalysts
| Autor: | Qingsong Dong, Ya Wang, Zhaomin Hao, Zhiqiang Fang, Yiyue Chu, Xiaoyu Shi, Mingxing Song |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Tafel equation
Materials science Inorganic chemistry Oxygen evolution General Physics and Astronomy chemistry.chemical_element 02 engineering and technology Surfaces and Interfaces General Chemistry Overpotential Raw material 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics Electrochemistry 01 natural sciences 0104 chemical sciences Surfaces Coatings and Films Nickel chemistry X-ray photoelectron spectroscopy 0210 nano-technology Stoichiometry |
| Zdroj: | Applied Surface Science. 491:590-594 |
| ISSN: | 0169-4332 |
| Popis: | Nickel sulfides have been considered to be among the most effective oxygen evolution reaction (OER) electrocatalysts. Until now, there are many different nickel sulfides, such as Ni3S2, NiS, Ni3S4, NiS2, etc. In this paper, we set out to explore the influence of the S:Ni ratio in raw materials on the different nickel sulfides. With the characterizations of XRD, XPS, SEM, TEM and BET, the relevance between the molar ratio of S:Ni in raw materials and stoichiometric ratio, microscopic structure and OER performance are discussed. According to the results of the experiments, the Ni3S4 derived from the 3:1 M ratio of S:Ni in raw material exhibits the smallest overpotential (245 and 314 mV to achieve 10 and 20 mA/cm2) and Tafel slope (81.5 mV/dec). Meanwhile, theoretical calculation of ΔG(H2O*) indicate that the adsorption energy in Ni3S4 is much closer to the IrO2 than other nickel sulfides, which are in good agreement with the OER performance of electrochemical measurements. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect