聚苯胺基ZnFe-N-C的制备及其电还原CO2催化性能研究
Study on preparation of polyaniline-based ZnFe-N-C and its catalytic performance for electrocatalytic reduction of CO2
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摘要: 以苯胺为单体、过硫酸铵为引发剂、ZnCl2和FeCl3为金属源,采用一步原位化学聚合法制备ZnFe-PANI催化剂前驱体,再经高温热解-酸化-二次热解合成ZnFe-N-C催化剂,利用XRD,SEM,Raman等方法对催化剂的形貌、结构进行表征,并采用电还原CO2反应考察其催化性能.结果表明:金属掺杂对N-C材料的形貌和结构影响不大,但可使其结构稳定性增强、缺陷位数目和活性位数目增多、电化学活性面积增大,有利于反应性能的提高;当前驱体中n(Zn):n(Fe)=3:1时,所得样品ZnFe-N-C-3-1的催化性能最好,在0.5 V的过电压下,电还原CO2产物CO法拉第效率高达55%.Abstract: Using aniline as monomer, ammonium persulfate as initiator, ZnCl2 and FeCl3 as metal sources, ZnFe-PANI catalyst precursor was prepared by one-step in-situ chemical polymerization method, and then ZnFe-N-C catalyst was synthesized by high temperature pyrolysis-acidification-secondary pyrolysis. The morphology and structure of the catalyst were characterized by XRD, SEM, Raman and other methods, and its catalytic performance was investigated by the electroreduction reaction of CO2. The results showed that metal doping had little effect on the morphology and structure of N-C materials, but enhanced its structural stability, increased the number of defect sites and active sites, and the area of electrochemical activity, which was conducive to the improvement of reaction performance; When the molar ratio of Zn and Fe was 3:1 in the precursor, the obtained sample ZnFe-N-C-3-1 had the best catalytic performance. At an overvoltage of 0.5 V, the Faraday efficiency of the CO2 product by electroreduction was as high as 55%.
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Key words:
- in-situ polymerization /
- polyaniline /
- electrocatalyst /
- CO2 reduction
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