Effects of Carbon Materials on Formation of CoN4Cx Active Site of Co-P4VPy/Carbon Catalysts for Selective CO2 Electroreduction to CO

IF 2.8 4区化学 Q3 CHEMISTRY, PHYSICAL

Electrocatalysis Pub Date : 2025-03-28 DOI:10.1007/s12678-025-00945-7

Siyuan Jia, Shoji Iguchi, Ichiro Yamanaka

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Abstract

Development of active electrocatalyst for CO₂ reduction to useful chemicals would be essential factor to achieve the carbon neutral society. The Co poly-4-vinyl-pyridine (P4VPy)/Ketjenblack (KB) activated thermally was found for an active electrocatalyst in the electroreduction of CO₂ with water by the solid-polymer-electrolyte, SPE, electrolysis cell. Various carbon supports were applied instead of KB. Contents of CoN₄C_x, CoO and Co⁰ compounds on activated electrocatalysts were determined by linear combination fitting, LCF, of X-ray absorption near edge structure, XANES. Pyrolysis of the catalyst precursor for activation was essential and kinds of carbon supports strongly influenced formation of the Co compounds. It was revealed that the content of CoN₄C_x related to the current efficiency of the CO formation and that of CoO and Co⁰ related the H₂ formation.

Graphical Abstract

Relation between Faraday efficiency to CO and content of CoN₄C_x

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碳材料对CO - p4vpy /碳选择性电还原CO催化剂CoN4Cx活性位点形成的影响

开发将二氧化碳还原为有用化学物质的活性电催化剂是实现碳中和社会的关键因素。在固相聚合物-电解质（SPE）电解池中，发现Co -聚4-乙烯基吡啶(P4VPy)/Ketjenblack （KB）是一种热活化的电催化剂，可用于CO2与水的电还原。采用各种碳载体代替KB。采用x射线吸收近边结构XANES线性组合拟合（LCF）法测定了活化电催化剂上CoN4Cx、CoO和Co0化合物的含量。催化剂前驱体的热解活化是必不可少的，碳载体的种类对Co化合物的形成有很大的影响。结果表明，CoN4Cx的含量与CO的电流生成效率有关，CoO和Co0的含量与H2的生成效率有关。图示：CO的法拉第效率与CoN4Cx含量的关系

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来源期刊

Electrocatalysis CHEMISTRY, PHYSICAL-ELECTROCHEMISTRY

CiteScore

4.80

自引率

6.50%

发文量

审稿时长

>12 weeks

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