人类生产力的持续发展致使 CO2 排放日益增长,对环境安全造成巨大的威胁.高温熔盐电解法捕获空气中 CO2 并转化为高附加值碳材料是一种有效减少 CO2 的方法.以碳酸锂-碳酸钙二元碳酸盐(Li-Ca)为熔盐主体系,通过梯度电流电解还原得到碳产物,并对生碳机理进行阐述.考察KOH添加剂对阴极碳产物进行形貌控制.SEM表明KOH添加剂促进球体向多孔碳材料的形成.通过调控温度、添加剂(KOH)的含量对阴极碳产物进行材料结构优化.通XRD、Raman表征可知,1 000 K、KOH添加量5%为最佳实验条件.
Effect of KOH on Morphology of Carbon Materials Prepared by Molten Salt Electrochemical Reduction of CO2
With the continuous development of mankind productivity,the emission of CO2 increases simultaneously,which causes large harm for ecosystem.High temperature molten salt electrolysis that captures CO2 and transforms to high value carbon materials can decrease effectively CO2.In this paper,binary carbonate(lithium carbonate-calcium carbonate(Li-Ca))was used as the main molten salt system,the carbon product was obtained by gradient current electrolysis in molten salt system,and the mechanism of generation of carbon product was analyzed.The morphology control of cathode carbon products by KOH additives was investigated.Carbon sphere transforming to porous carbon after adding KOH was demonstrated by SEM.Adjusting temperature or proportion,respectively,optimal structure of carbon product was obtained.1 000 K,5%proportion of KOH was optimal condition according to the XRD,Raman analysis.
High temperature molten saltsCarbon dioxideElectrochemical conversionCarbon nanomaterials
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