Oxygen evolution catalysts on supports with a 3-D ordered array structure and intrinsic proton conductivity for proton exchange membrane steam electrolysis
Oxygen evolution catalysts on supports with a 3-D ordered array structure and intrinsic proton conductivity for proton exchange membrane steam electrolysis
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DOI：
10.1039/c3ee41438h
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发表时间：
2014-01
影响因子：
32.5
通讯作者：
Junyuan Xu;Junyuan Xu;D. Aili;Qingfeng Li;E. Christensen;J. Jensen;Wei Zhang;Martin Kalmar Hansen-Martin-Kalmar-Ha
中科院分区：
文献类型：
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作者：
Junyuan Xu;Junyuan Xu;D. Aili;Qingfeng Li;E. Christensen;J. Jensen;Wei Zhang;Martin Kalmar Hansen-Martin-Kalmar-Ha
质子交换膜蒸汽电解槽由于析氧反应（OER）反应动力学慢，在恶劣的工作环境下耐久性差，导致催化剂活性和耐久性不足。为了提高氧电极动力学和耐久性，在锡掺杂的氧化铟上通过原位磷酸化反应合成了具有高电子和本征质子电导率的氧化铱复合支撑材料。在130°C的水蒸气气氛下，总电导率为0.72 S cm−1，质子电导率约为10−2 S cm−1。三维有序六边形阵列的支撑结构具有180 m2 g−1的高比表面积。得益于复合载体材料的混合电导率和多孔结构，负载型IrO2催化剂在酸性电解质中的OER活性提高了约5倍。在130°C的PEM电解槽试验中进一步证实了OER的催化性能。在350 mA cm−2下对这种蒸汽电解槽进行的测试表明，在长达1150小时的时间内，它具有良好的耐久性。
Proton exchange membrane steam electrolyzers suffer from insufficient catalyst activity and durability due to the slow reaction kinetics for oxygen evolution reaction (OER) and poor durability under harsh operating environments. Aiming at enhancement of oxygen electrode kinetics and durability, composite support materials for iridium oxide are synthesized via in situ phosphorization reaction on tin doped indium oxide and possess functionalities of high electronic and intrinsic proton conductivity. At 130 °C under a water vapor atmosphere an overall conductivity of 0.72 S cm−1 is achieved with a contribution of around 10−2 S cm−1 proton conductivity. The support structure of three-dimensionally ordered hexagonal arrays displays a high specific surface area of 180 m2 g−1. Benefiting from the mixed conductivities and porous structure in the composite support materials, the supported IrO2 catalysts exhibit about five times enhancement of the OER activity in acidic electrolytes. The improved catalytic performance for the OER was further confirmed by PEM electrolyzer tests at 130 °C. A test of such a steam electrolyzer cell at 350 mA cm−2 shows good durability within a period of up to 1150 hours.