ZIF-Derived Cobalt Sulfides Embedded on Nitrogen-Doped Carbon Frameworks for Efficient Hydrogen Evolution Reaction

IF 2.1 4区材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Electronic Materials Letters Pub Date : 2024-05-24 DOI:10.1007/s13391-024-00502-2

Joon Soo Rhie, Ha Huu Do, Soo Young Kim

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Abstract

The development of efficient and durable catalysts for the hydrogen evolution reaction (HER) is essential for sustainable energy research. Cobalt sulfides (CoS_x) have attracted significant interest as prospective catalysts for the HER owing to their promising catalytic activity and high stability. In this study, CoS_x nanocrystals embedded in nitrogen-doped carbon frameworks (NC) are fabricated using a zeolite imidazole framework precursor via a two-step pyrolysis-sulfurization process, followed by combination with carbon black (CB) to create CoS_x-NC/CB as an efficient electrocatalyst for the HER. Interestingly, this catalyst displays a higher HER activity than that of the investigated materials, with an overpotential of 282 mV at a current density of 10 mA cm^− 2, along with a Tafel slope of 57.6 mV dec^− 1 in an acidic solution. This performance is attributed to the synergistic effect of CoS_x nanoparticles, nitrogen-doped carbon, and highly conductive CB, which improves the number of active sites, electron transfer, and electrochemical surface area. This outcome has significant potential for the development of economically viable catalysts for water splitting.

Graphical Abstract

Abstract Image

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嵌入掺氮碳框架的 ZIF 衍生硫化钴，用于高效氢气进化反应

开发高效耐用的氢进化反应（HER）催化剂对于可持续能源研究至关重要。硫化钴（CoSx）具有良好的催化活性和高稳定性，作为氢进化反应的前瞻性催化剂引起了人们的极大兴趣。本研究使用沸石咪唑框架前驱体，通过热解-硫化两步法制备了嵌入氮掺杂碳框架（NC）的 CoSx 纳米晶体，然后将其与炭黑（CB）结合，制备出 CoSx-NC/CB 作为高效的热释电催化剂。有趣的是，这种催化剂显示出比其他研究材料更高的 HER 活性，在酸性溶液中，电流密度为 10 mA cm- 2 时的过电位为 282 mV，塔菲尔斜率为 57.6 mV dec-1。这一性能归功于 CoSx 纳米粒子、掺氮碳和高导电性 CB 的协同效应，它们改善了活性位点的数量、电子传递和电化学表面积。这一成果对于开发经济上可行的水分离催化剂具有重大潜力。

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来源期刊

Electronic Materials Letters 工程技术-材料科学：综合

CiteScore

4.70

自引率

20.80%

发文量

审稿时长

2.3 months

期刊介绍： Electronic Materials Letters is an official journal of the Korean Institute of Metals and Materials. It is a peer-reviewed international journal publishing print and online version. It covers all disciplines of research and technology in electronic materials. Emphasis is placed on science, engineering and applications of advanced materials, including electronic, magnetic, optical, organic, electrochemical, mechanical, and nanoscale materials. The aspects of synthesis and processing include thin films, nanostructures, self assembly, and bulk, all related to thermodynamics, kinetics and/or modeling.