为了减少工业烟气中余热与CO2的排放,本文提出了热再生电池堆-二氧化碳电化学还原池系统(TRB-CO2RR).该系统通过串联多个非水系热再生电池(thermally regenerative battery,TRB)构建电堆,并将其用于驱动CO2电化学还原(electrochemical reduction of CO2,CO2RR).本文研究了CO2电化学还原特性、非水系TRB电堆性能及非水系TRB-CO2RR系统耦合特性.研究结果表明,碳纸负载纳米银多孔电极上催化剂分布较为均匀,在-1.8V电位下(对应的槽电压为5.1V)表现出最佳的电化学还原CO2 性能,其CO法拉第效率达到了最佳值78.7%.为此,构建了6个子电池的串联电堆,开路电压达到7.2V左右,最大功率为235mW,在34min内放电相对稳定.运行非水系TRB-CO2RR耦合系统后,电堆未出现反极现象,CO法拉第效率(73.1%)接近稳定电源所获得的最佳值.未来研究可通过优化催化剂和电堆设计,有望进一步提高耦合系统CO2RR转化效率.
Abstract
To effectively address the low-temperature heat and CO2 in industrial flue gas,a thermal regenerative battery stack coupled with an electrochemical reduction reaction of carbon dioxide system(TRB-CO2RR)was developed.A stack was constructed by connecting several non-aqueous thermally regenerative batteries in series,serving to drive an electrochemical reduction of CO2.The characteristics of CO2RR,the performance of the non-aqueous TRB stack,and the coupling characteristics of the non-aqueous TRB-CO2RR system were studied.The results demonstrated a relatively uniform distribution of catalyst on a carbon paper-supported silver nanoparticle porous electrode.The optimal CO2RR performance was observed at a potential of-1.8V(corresponding to a slot voltage of 5.1V),with a CO Faraday efficiency reaching a peak of 78.7%.Therefore,a series stack of six batteries was constructed.The open circuit voltage reached approximately 7.2V,with a maximum power of 235mW and a relatively stable discharge lasting for 34min.In the non-aqueous TRB-CO2RR coupled system,no reverse pole phenomenon was observed in the stack,and the CO Faraday efficiency(73.1%)closely approached the optimum value achieved by a stable power supply.Further research could be focused on optimizing catalysts and stack design,aiming to improve the efficiency of CO2RR in this coupled system.
关键词
热再生电池/CO2电化学还原/串联电堆/产电功率/稳定性/法拉第效率/电化学/回收
Key words
thermally regenerative battery/electrochemical CO2 reduction/series stack/power generation/stability/Faraday efficiency/electrochemistry/recovery
维普
万方数据