ZIF67-derived ultrafine Co9S8 nanoparticles embedded in nitrogen-doped hollow carbon nanocages for enhanced performances of trifunctional ORR/OER/HER and overall water splitting

IF 5.5 3区材料科学 Q2 CHEMISTRY, MULTIDISCIPLINARY

Carbon Letters Pub Date : 2024-04-16 DOI:10.1007/s42823-024-00733-1

Quoc Hao Nguyen, Kyungmin Im, Thach N. Tu, Jongwook Park, Jinsoo Kim

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Abstract

Electrochemical oxidation and reduction reactions are fundamental in various conversion and energy storage devices. Functional materials derived from MOFs have been considered promising as electrical catalysts for ORR, HER, and OER, which can be used in Zinc-air batteries and water electrolysis. Herein, we designed a novel approach to fabricating the ultrafine Co₉S₈ embedded nitrogen-doped hollow carbon nanocages (Co₉S₈@N-HC). The method involved a process of sulfidation of cobalt-based metal–organic frameworks (ZIF67) and then coating them with polypyrrole (PPy). PPy has notable properties such as high electrical conductivity and abundant nitrogen content, rendering it highly promising for catalytic applications. The Co₉S₈@N-HC catalyst was successfully synthesized via the carbonization of CoS_x@PPy. Remarkably, the Co₉S₈@N-HC catalyst demonstrated exceptional electrocatalytic activity, requiring only low overpotentials of 285 mV and 201 mV at 10 mA cm^‒2 for OER and HER, respectively, and exhibited high activity for ORR, with an onset potential (E_onset) of 0.923 V and half-wave potential (E_1/2) of 0.879 V in alkaline media. The electrocatalytic efficiency displayed by Co₉S₈@N-HC opens a new line of research on the synergistic effect of MOF-PPy materials on energy storage and conversion.

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氮掺杂空心碳纳米笼中嵌入的 ZIF67 衍生超细 Co9S8 纳米粒子可提高 ORR/OER/HER 和整体水分离三重功能的性能

电化学氧化和还原反应是各种转换和储能设备的基础。由 MOFs 衍生的功能材料被认为是很有前途的 ORR、HER 和 OER 电催化剂，可用于锌-空气电池和水电解。在此，我们设计了一种新方法来制造嵌入氮掺杂空心碳纳米笼（Co9S8@N-HC）的超细 Co9S8。该方法涉及钴基金属有机框架（ZIF67）的硫化过程，然后在其表面涂覆聚吡咯（PPy）。聚吡咯具有高导电性和丰富的氮含量等显著特性，因此在催化应用方面大有可为。通过对 CoSx@PPy 进行碳化，成功合成了 Co9S8@N-HC 催化剂。值得注意的是，Co9S8@N-HC 催化剂表现出了卓越的电催化活性，在 10 mA cm-2 的条件下，OER 和 HER 的过电位分别仅为 285 mV 和 201 mV，ORR 的活性也很高，在碱性介质中，起始电位（Eonset）为 0.923 V，半波电位（E1/2）为 0.879 V。Co9S8@N-HC 所表现出的电催化效率为研究 MOF-PPy 材料在能量存储和转换方面的协同效应开辟了一条新的思路。

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来源期刊

Carbon Letters CHEMISTRY, MULTIDISCIPLINARY-MATERIALS SCIENCE, MULTIDISCIPLINARY

CiteScore

7.30

自引率

20.00%

发文量

118

期刊介绍： Carbon Letters aims to be a comprehensive journal with complete coverage of carbon materials and carbon-rich molecules. These materials range from, but are not limited to, diamond and graphite through chars, semicokes, mesophase substances, carbon fibers, carbon nanotubes, graphenes, carbon blacks, activated carbons, pyrolytic carbons, glass-like carbons, etc. Papers on the secondary production of new carbon and composite materials from the above mentioned various carbons are within the scope of the journal. Papers on organic substances, including coals, will be considered only if the research has close relation to the resulting carbon materials. Carbon Letters also seeks to keep abreast of new developments in their specialist fields and to unite in finding alternative energy solutions to current issues such as the greenhouse effect and the depletion of the ozone layer. The renewable energy basics, energy storage and conversion, solar energy, wind energy, water energy, nuclear energy, biomass energy, hydrogen production technology, and other clean energy technologies are also within the scope of the journal. Carbon Letters invites original reports of fundamental research in all branches of the theory and practice of carbon science and technology.