DCMFC两腔液量变化与产电性能的关系

尹越1 袁林江1 牛雨薇1

(1.陕西省环境重点实验室西北水资源环境与生态重点实验室西安建筑科技大学环境与市政工程学院, 陕西西安 710055)

【摘要】随着DCMFC产电周期的增加, 阴阳极间的液位差明显增加。为解析此现象, 从蒸发、渗透压、生物代谢及电场角度考察了质子和水的传递行为, 研究了产水与电池性能的关系。结果表明:360 h内蒸发、渗透压引起的液量变化少于0.50 ml (液面降低0.5 mm) ;断路312 h, 阳极代谢气体使PEM形变凸向阴极, 阳极液减少6.20 ml (下降6.5 mm) , 阴极液增加10.75 ml (上升11.2 mm) , 两腔液位差达17.7 mm;通路下, 除膜的形变, 水合质子被电渗透到阴极并还原成水, 312 h内阳极液减少10.70 ml (下降11.1 mm) , 阴极液增加17.00 ml (上升17.7mm) , 两腔液位差达28.8 mm, 且产水量随电压的增大而增加。研究表明, 生物代谢及电渗透对两腔液量影响较大, 产水量可表征质子传递率。经计算该系统质子传递率大于54%, 为评判产电效率提供了简便依据。

【关键词】 燃料电池; 液量变化; 电渗透; 质子传递; 生物催化; 厌氧;

【DOI】

【基金资助】 重大水专项 (2009ZX07212-002) 重大水专项 (2009ZX07212-002)

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This Article

ISSN:0438-1157

CN: 11-1946/TQ

Vol 69, No. 08, Pages 3605-3610

August 2018

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Article Outline

摘要

  • 引言
  • 1 实验材料和方法
  • 2 实验结果与讨论
  • 3 结论
  • 符号说明
  • 参考文献