一体式再生燃料电池双功能氧电极高分散工艺研究  

Study on high dispersion technology of bifunctional oxygen electrodes in proton exchange membrane unitized regenerative fuel cells

作　　者：张忠豪 邱殿凯 彭林法[1,2] 易培云[1,2] ZHANG Zhonghao;QIU Diankai;PENG Linfa;YI Peiyun(State Key Laboratory of Mechanical System and Vibration,Shanghai Jiao Tong University;Shanghai Key Laboratory of Digital Manufacture for Thin-walled Structures,Shanghai Jiao Tong University,Shanghai 200240,China)

机构地区：[1]上海交通大学机械系统与振动国家重点实验室 [2]上海交通大学薄板结构数字化上海重点实验室,上海200240

出　　处：《储能科学与技术》2024年第5期1417-1426,共10页Energy Storage Science and Technology

基　　金：国家自然科学基金面上项目(52075322);教育部集成创新平台集成攻关大平台项目(AF3230004-001)。

摘　　要：一体式再生燃料电池(PEM-URFC)将燃料电池和电解池融为一体,正向耗氢发电,反向电解产氢,是理想的储能装置。双功能氧电极(BOE)是承担氧还原反应与析氧反应的核心场所,通常由Pt和IrO_(2)两种材料混合制备而成。制备BOE的浆料难分散,导致催化剂利用率低、耐久性差。为了克服上述难题,本研究通过结合巯基-聚乙二醇-羧基稳定剂与间隔超声分散工艺的方法,提升了Pt-IrO_(2)浆料的分散效果和稳定性,并在此基础上制备了高分散的BOE。实验结果表明,本研究所制备的BOE富含纳米级孔,相较于通过持续超声分散工艺制备的BOE,催化剂利用率更高。极化性能测试结果表明,由本研究制备BOE所组装的PEM-URFC在0.5 A/cm^(2)工作条件下双向效率最高可达51.12%,比由持续超声分散工艺制备BOE所组装PEM-URFC的双向效率高9%;此外,在3000次加速实验后,由本研究制备BOE所组装的PEM-URFC双向效率仅衰减0.249%,低于由持续超声分散工艺制备BOE所组装PEM-URFC的1.675%。本工作所提出的结合稳定剂与间隔超声分散工艺提升分散效果的方法,对优化双功能电极的制备工艺具有一定的参考价值。Proton exchange membrane unitized regenerative fuel cells(PEM-URFCs)are considered to be one of the most ideal energy storage devices.In PEM-URFCs,the processes carried out in a fuel cell and water electrolysis are integrated.Bifunctional oxygen electrodes(BOEs)constitute the core structure of the oxygen reduction reaction and that of the oxygen evolution reaction;this is facilitated by preparing a slurry of Pt and IrO_(2) materials.Since dispersing this catalyst slurry is difficult,this results in low catalyst utilization and poor durability.To overcome the above problems,in this study,the dispersion effect and stability of the Pt-IrO_(2) slurry were improved by combining the HS-PEG-COOH stabilizer with the interval ultrasonic dispersion process.Subsequently,the BOE was prepared by using this slurry.The experimental results show that the BOE prepared in this study is rich in nanoscale pores,and has a higher catalyst utilization rate and better round-trip efficiency(RTE)than the BOE prepared by the continuous ultrasonic dispersion process.The polarization performance test results show that the RTE of the PEM-URFC assembled by the BOE prepared in this study can reach up to 51.12% under the working condition of 0.5 A/cm^(2),which is 9% higher than that of reached by the PEM-URFC assembled by the BOE prepared by the continuous ultrasonic dispersion process.Additionally,after 3000 accelerated experiments,it was found that the RTE of the PEM-URFC assembled by the BOE prepared by this study decreased by only 0.249%,which was lower than that of the PEM-URFC assembled by the BOE prepared by the continuous ultrasonic dispersion process by 1.675%.Hence,the proposed method of combining the HS-PEG-COOH stabilizer and interval ultrasonic dispersion technology to improve the dispersion effect of the slurry used to prepare the BOE contributes to the existing knowledge regarding optimizing the preparation process of the BOE.

关 键 词：一体式再生燃料电池 双功能氧电极 稳定剂 间隔超声分散工艺 

分 类 号：TQ116.2[化学工程—无机化工]