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Preparation and Electrocatalytic Performances of Cobalt-nitrogen Doped Wood-derived Carbon
Received:July 01, 2024  
DOI：10.11980/j.issn.0254-508X.2024.12.001
Key Words:biomass  wood-derived carbon  oxygen reduction reaction  oxygen evolution reaction
Fund Project:国家重点研发计划（2023YFE0109600）；国家万人计划青年拔尖人才支持计划（x2qsA4210090）；国家自然科学基金（32201499）；广州市重点研发计划（2023B03J1330）。
Author NameAffiliationPostcode
ZHOU Jiawei State Key Lab of Pulp and Paper Engineering， South China University of Technology， Guangzhou， Guangdong Province， 510640 510640
CHEN Zehong State Key Lab of Pulp and Paper Engineering， South China University of Technology， Guangzhou， Guangdong Province， 510640 510640
LI Tingzhen State Key Lab of Pulp and Paper Engineering， South China University of Technology， Guangzhou， Guangdong Province， 510640 510640
PENG Xinwen* State Key Lab of Pulp and Paper Engineering， South China University of Technology， Guangzhou， Guangdong Province， 510640 510640
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Abstract:In this study， a cobalt-nitrogen doped wood-derived bifunctional catalyst （CoHNC） with Co-N active sites was prepared via a simple Lewis acid hydrothermal pretreatment and followed by a high-temperature pyrolysis. The physicochemical structures and electrochemical properties of CoHNC were investigated. The results showed that Lewis acids could partly hydrolyze the cellulose and hemicellulose in the wood， resulting in abundant nanopores， and a high specific surface area of 1 008.02 m2/g. Metal atoms coordinate with the oxygen-containing functional groups during hydrothermal pretreatment， which was then converted into Co-N active sites after pyrolysis. The hierarchical pore structure of CoHNC facilitated the efficient diffusion of electrolyte/oxygen and the exposure of high-density active sites. The Co—N structure could effectively regulate the microenvironment of the catalyst， and thus improve the catalytic performance. CoHNC presented excellent oxygen reduction reaction（ORR） and oxygen evolution reaction（OER） activities with a positive half-wave potential of 0.869 V vs. RHE in 0.1 mol/L KOH solution， a OER overpotential of 274 mV at a current density of 10 mA/cm2 and a ∆E of only 0.635 V， which outperform those of commercial Pt/C and RuO2.
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