太阳能驱动高温熔融碳酸盐电解电势的理论分析

Theoretical analysis of electrodeposition potentials of molten carbonates driven by solar energy

太阳能驱动转化二氧化碳制燃料系统是一个完美的Solar-CO2-Fuel绿色循环系统,此系统采用的工质是熔融碳酸盐,即在高温下循环电解还原碳酸盐成为碳或一氧化碳.通过分析太阳能驱动转化二氧化碳的STEP模式,以高温熔融碳酸盐的电化学反应为模型,从理论上计算各种碳酸盐在高温下的电解电势.结果表明:碳酸盐在高温下有3种主要电极反应模式,在不同温度下有不同的反应产物;电解温度越高,电解电势越低,越有利于电解反应;一价碳酸盐中碳酸锂最容易还原成为碳或一氧化碳,并且还原成为金属的电势最高.

The system is completely driven by solar energy for splitting CO2to fuel features a perfectly recycling Solar-CO2-Fuel device.The carbonates are used for the electrolyte operated in a high temperature.In this paper,the SPET theory of the system iss briefly analyzed.Based on the electrochemical reactions in the high temperature,the electrodeposition potentials of molten carbonates driven by solar were calculated by the chemical thermodynamics.The results show that three reaction ways display the different pr...