Investigation of hydrogen superoxide adsorption during ORR on Pt/C catalyst in acidic solution for PEFC by in-situ high energy resolution XAFS
Investigation of hydrogen superoxide adsorption during ORR on Pt/C catalyst in acidic solution for PEFC by in-situ high energy resolution XAFS
复制标题
通过原位高能分辨率 XAFS 研究 PEFC 酸性溶液中 Pt/C 催化剂 ORR 过程中超氧化氢的吸附
DOI：
10.1016/j.jpowsour.2022.232508
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发表时间：
2023
影响因子：
9.2
通讯作者：
Tanaka Hirohisa
中科院分区：
文献类型：
--
作者：
Yamamoto Naoki;Matsumura Daiju;Hagihara Yuto;Tanaka Kei;Hasegawa Yuta;Ishii Kenji;Tanaka Hirohisa
氧还原反应（ORR）是聚合物电解质燃料电池（PEFC）中的关键电化学反应之一。在这项工作中，在ORR的反应途径和中间物种，如分子型氧进行了讨论。用高能量分辨X射线吸收精细结构谱研究了Pt催化剂的电子结构。碳载Pt纳米颗粒作为粉末催化剂用于测量作为更现实的条件，并分析吸附在Pt纳米颗粒上的物种，同时控制在酸性电解质溶液中的电位下，N2或O2气体鼓泡。分子型氧吸附物种仅在O2鼓泡的电解质溶液中观察到。这种中间吸附物种被分配到过氧化氢。
Oxygen Reduction Reaction (ORR) is one of the key electrochemical reactions, especially in Polymer Electrolyte Fuel Cells (PEFCs). In this work, the reaction pathway and intermediate species such as molecular-type oxygen during ORR were discussed. High energy resolution X-ray absorption fine structure spectra at the Pt L3-edge were obtained to observe the electronic structure of Pt catalyst. Carbon-supported Pt nanoparticles as powder catalysts were used for measurement as more realistic conditions, and the species adsorbed on the Pt nanoparticles were analyzed while controlling under the potentials in acidic electrolyte solution with N2or O2gas bubbling. Molecular-type oxygen adsorption species is observed only in the O2-bubbled electrolyte solution. This intermediate adsorption species is assigned to a hydrogen superoxide.