Unparalleled mitigation of membrane degradation in fuel cells via a counter-intuitive approach: suppression of H2O2 production at the hydrogen anode using a Ptskin–PtCo catalyst†,Journal of Materials Chemistry A

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Unparalleled mitigation of membrane degradation in fuel cells via a counter-intuitive approach: suppression of H2O2 production at the hydrogen anode using a Ptskin–PtCo catalyst†
Journal of Materials Chemistry A ( IF 10.7 ) Pub Date : 2020-01-09 , DOI: 10.1039/c9ta12023h
Guoyu Shi _{1,

2,

3,

4} , Donald A. Tryk _{2,

3,

4,

5} , Toshio Iwataki _{2,

3,

4,

5} , Hiroshi Yano _{2,

3,

4,

5} , Makoto Uchida _{2,

3,

4,

5} , Akihiro Iiyama _{2,

3,

4,

5} , Hiroyuki Uchida _{1,

2,

3,

4,

5}

Affiliation

Hydroxyl radicals (˙OH) are responsible for much of the degradation of the proton exchange membrane (PEM) used in fuel cells. The conventional approach has been to use radical scavengers incorporated into the PEM, but performance is decreased. Here, we propose a counter-intuitive strategy in which the production of hydrogen peroxide, the precursor of ˙OH, is suppressed at the hydrogen anode, where oxygen diffusing from the cathode is reduced by adsorbed hydrogen atoms. This is accomplished via the use of a Pt skin-covered PtCo alloy anode catalyst, on which H is weakly adsorbed, as indicated by theoretical calculations. In particular, the H₂O₂ production on the hydrogen anode at a practical temperature of 80 °C was, for the first time, evaluated by the application of the channel flow double electrode (CFDE) technique. A remarkably longer lifetime of a PEM with the PtCo/C anode, in comparison with that for a commercial Pt/C anode, has been demonstrated in an accelerated stress test of a single cell (open circuit under pressurized gases).

中文翻译：

通过违反直觉的方法，无可比拟地减轻了燃料电池中膜的降解：使用Pt_蒙皮– PtCo催化剂抑制了氢阳极处H ₂ O _2的产生†

羟基自由基（˙OH）是造成燃料电池中质子交换膜（PEM）降解的主要原因。常规方法是使用结合到PEM中的自由基清除剂，但性能会下降。在此，我们提出了一种违反直觉的策略，其中在氢阳极处抑制过氧化氢（即OH的前体）的产生，而氢从阴极扩散的氧减少了氢的阳极。如理论计算所表明的，这是通过使用覆盖有Pt的PtCo合金阳极催化剂来实现的，H吸附在Ht上。特别是H ₂ O ₂首次通过应用通道流双电极（CFDE）技术评估了在80°C的实际温度下在氢阳极上的生产。与商用Pt / C阳极相比，具有PtCo / C阳极的PEM的使用寿命显着更长，已在单电池的加速应力测试（加压气体下的开路）中得到证明。

更新日期：2020-01-09

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