Hydrogen Peroxide Formation Rates in a PEMFC Anode and Cathode Effect of Humidity and Temperature
Hydrogen Peroxide Formation Rates in a PEMFC Anode and Cathode Effect of Humidity and Temperature
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DOI：
10.1149/1.2801980
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发表时间：
2020-02
影响因子：
3.9
通讯作者：
V. Sethuraman;J. Weidner;A. Haug;S. Motupally;L. Protsailo
中科院分区：
文献类型：
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作者：
V. Sethuraman;J. Weidner;A. Haug;S. Motupally;L. Protsailo
通过研究旋转环盘电极上的氧还原反应 (ORR)，将质子交换膜燃料电池 (PEMFC) 阳极和阴极中的过氧化氢 (H 2 O 2 ) 形成速率估计为湿度和温度的函数。通过将 Pt/Vulcan XC-72 催化剂薄膜沉积到圆盘上并通过改变温度、溶解的 O 2 浓度和盐酸 (HClO 4 ) 的酸度水平来复制燃料电池条件。 HClO 4 酸度与离聚物水活性相关，因此与燃料电池湿度相关。 H 2 O 2 形成速率显示出对氧浓度的线性依赖性和对水活度的平方依赖性。 ORR 中的 H 2 O 2 选择性与氧浓度无关，但随着水活度的降低（即湿度降低）而增加。 H 2 O 2 形成反应的电势相关活化能根据在不同温度下获得的数据来估计。
Hydrogen peroxide (H 2 O 2 ) formation rates in a proton exchange membrane fuel cell (PEMFC) anode and cathode were estimated as a function of humidity and temperature by studying the oxygen reduction reaction (ORR) on a rotating ring disk electrode. Fuel cell conditions were replicated by depositing a film of Pt/Vulcan XC-72 catalyst onto the disk and by varying the temperature, dissolved O 2 concentration, and the acidity levels in hydrochloric acid (HClO 4 ). The HClO 4 acidity was correlated to ionomer water activity and hence fuel cell humidity. The H 2 O 2 formation rates showed a linear dependence on oxygen concentration and square dependence on water activity. The H 2 O 2 selectivity in ORR was independent of oxygen concentration but increased with the decrease in water activity (i.e., decreased humidity). Potential dependent activation energy for the H 2 O 2 formation reaction was estimated from data obtained at different temperatures.