纳米碳片负载Mott-Schottky型Co/Co<sub>9</sub>S<sub>8</sub>异质结的原位合成及电催化性能研究

doi:10.11896/cldb.23040234

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Abstract Using K₃[Co(CN)₆] as Co source, thiurea as S source and natural hydrophilic polymer chitosan rich in -OH and -NH₂ as carbon source, the Co precursor and S source were uniformly distributed in the C precursor by forming CS-K₃[Co(CN)₆] hydrogel. The main driving force of hydrogel formation is the coordination crosslinking of metal Co ions with -NH₂ in chitosan and the bridging between Co ions via -CN. Thanks to the uniformly dispersed precursor and the catalysis of the Co formed at the initial stage of subsequent pyrolysis, N, S co-doped carbon nanosheets with encaged Co/Co₉S₈ heterojunction (Co/Co₉S₈@N, S-CNSs) were constructed in situ by simply regulating the atomic ratio of Co to S. The morphology, composition and structure of the prepared electrocatalysts and the oxygen evolution reaction performance were analyzed with SEM, TEM, BET, XRD, Raman, XPS and electrochemical workstations. The results show that the Mott-Schottky type Co/Co₉S₈ interface effectively regulates the electronic structure and charge-transport characteristics of the active center. The loading of two-dimensional doped porous carbon nanosheets makes the active sites more evenly dispersed, while providing high-speed electron and mass transfer channels, as well as avoiding the migration and aggregation of active sites during the catalytic process. The synergistic action of these two allows the proposed Co/Co₉S₈@N, S-CNSs catalyst have better electrocatalytic performances. At a current density of 10 mA·cm^-2, the overpotential of the proposed catalyst for basic oxygen evolution reaction/OER is only 304 mV, which is better than that of the commercial RuO₂. This study is helpful for the development of cheap transition metal catalysts with excellent electrocatalytic properties.

Key words： Co/Co₉S₈ Mott-Schottky N,S co-doped carbon nanosheet transition metal electrocatalyst

Published: 25 April 2024 Online: 2024-04-28

CLC number:

TK91

Fund:National Natural Science Foundation of China (22072067, 21972068, 22279062) and the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD) (1107047002).

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	Articles by authors
	FANG Yu
	LI Jing
	KONG Weichao
	ZHOU Xue
	XU Lin
	SUN Dongmei
	TANG Yawen

Cite this article:

FANG Yu,LI Jing,KONG Weichao, et al. In-situ Synthesis of Mott-Schottky Co/Co₉S₈ Heterojunction Anchored on Carbon Nanosheets for Efficient Electrochemical Performance[J]. Materials Reports, 2024, 38(8): 23040234-7.

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http://www.mater-rep.com/EN/10.11896/cldb.23040234 OR http://www.mater-rep.com/EN/Y2024/V38/I8/23040234

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