Chemical Industry and Engineering Progress ›› 2024, Vol. 43 ›› Issue (5): 2568-2575.DOI: 10.16085/j.issn.1000-6613.2023-2130

• New and renewable energy • Previous Articles    

Electrochemical characteristics of the coupled system of thermally regenerative battery stack and electrochemical CO2 reduction cell

LI Si1,2(), TAO Yiyue1,2, XIAO Zhenchong1,2, ZHANG Liang1,2(), LI Jun1,2, ZHU Xun1,2, LIAO Qiang1,2   

  1. 1.Key Laboratory of Low-grade Energy Utilization Technologies and Systems, Ministry of Education, Chongqing University, Chongqing 400030, China
    2.Institute of Engineering Thermophysics, Chongqing University, Chongqing 400030, China
  • Received:2023-12-01 Revised:2024-04-16 Online:2024-06-15 Published:2024-05-15
  • Contact: ZHANG Liang

热再生电池堆-二氧化碳电化学还原池系统耦合特性

李思1,2(), 陶艺月1,2, 肖振翀1,2, 张亮1,2(), 李俊1,2, 朱恂1,2, 廖强1,2   

  1. 1.重庆大学低品位能源利用技术及系统教育部重点实验室,重庆 400030
    2.重庆大学工程热物理研究所,重庆 400030
  • 通讯作者: 张亮
  • 作者简介:李思(2000—),女,硕士研究生,研究方向为电化学能源转化。E-mail:lisi@stu.cqu.edu.cn
  • 基金资助:
    国家自然科学基金(51976018);国家自然科学基金创新研究群体项目(52021004);重庆市自然科学基金(CSTB2022NSCQ-MSX1596);重庆归国留学人员科研基金(cx2021088)

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 CO2RRperformance 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.

Key words: thermally regenerative battery, electrochemical CO2 reduction, series stack, power generation, stability, Faraday efficiency, electrochemistry, recovery

摘要:

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。

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

CLC Number: 

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