Continuous Network of Phase-Tuned Nickel Sulfide Nanostructures for Electrocatalytic Water Splitting

硫化镍 分解水 过电位 材料科学 硫化物 电解质 贵金属 电化学 化学工程 无机化学 析氧 电催化剂 纳米结构 催化作用 纳米技术 金属 化学 电极 冶金 物理化学 光催化 有机化学 工程类
作者
Anand P. Tiwari,Yeoheung Yoon,Travis G. Novak,Ki‐Seok An,Seungwon Jeon
出处
期刊:ACS applied nano materials [American Chemical Society]
卷期号:2 (8): 5061-5070 被引量:50
标识
DOI:10.1021/acsanm.9b00985
摘要

To date, nanostructures of 3d-group transition metal (i.e., Fe, Co, Ni, etc.) derivatives show the highest electrocatalytic performance among non-noble-metal electrocatalysts for water splitting in acidic electrolyte. However, the poor electrochemical conductivity (∼10–4 S/cm) of nanostructures restricts practical application for overall electrocatalytic activity. Herein, continuously networked nanostructures of phase-tuned nickel sulfide foams for efficient water splitting electrocatalysts in both acidic and alkaline electrolytes are reported. Because continuously networked nanostructures of nickel sulfide foams possess an integral structure, they exhibit high electrochemical conductivity (∼1 S/cm), which eases adsorption/desorption of H+ and OH– ions for efficient overall water splitting. By tuning the stoichiometry of sulfur, four different phases of continuously networked nanostructures of nickel sulfides (αNiS, βNiS, Ni3S2, and Ni7S6) foams are formed by facile phase transformation of nickel. Among them, the Ni7S6 foam (Ni7S6-F) possesses superior electrocatalytic activity with extremely low overpotential of 70 mV (for hydrogen evolution reaction) and 1.37 V (for oxygen evolution reaction) at 10 mA/cm2 in acidic and alkaline medium, respectively, which is close to noble-metal-based electrocatalysts. As a result, this work demonstrates a facile synthesis route to optimize nickel sulfide electrocatalysts through phase-tuning and continuous networking for overall water splitting and would be applicable on other nanostructured electrocatalysts to improve their electrocatalytic activity for practical applications in future energy devices.
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