Investigation of supported IrO2 as electrocatalyst for the oxygen evolution reaction in proton exchange membrane water electrolyser
Investigation of supported IrO2 as electrocatalyst for the oxygen evolution reaction in proton exchange membrane water electrolyser
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DOI：
10.1016/j.ijhydene.2013.11.056
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发表时间：
2014-02-04
影响因子：
7.2
通讯作者：
Scott, Keith
中科院分区：
文献类型：
--
作者：
Puthiyapura, Vinod Kumar;Pasupathi, Sivakumar;Scott, Keith
氧化铟锡（ITO）用作析氧反应中 IrO2 催化剂的载体。使用 Adam 融合法，将 IrO2 纳米颗粒以不同的负载量沉积在尺寸为 17-28 nm 的市售 ITO 纳米颗粒上。使用X射线衍射(XRD)、扫描电子显微镜(SEM)和透射电子显微镜(TEM)对制备的催化剂进行了表征。载体的 BET 表面积 (35 m(2)/g) 比无载体的 IrO2 (112.7 m(2)/g) 低 3 倍。催化剂的表面积和电子电导率主要由 IrO2 贡献。负载型催化剂在用于电解槽操作的膜电极组件（MEA）中进行了测试。在使用 Nafion 115 膜的 80 摄氏度 MEA 极化测试中，90% IrO2-ITO 的性能 (1.74 V@1 A/cm(2)) 与无载体 IrO2 (1.73 V@1 A/cm(2)) 相似，这归因于活性 IrO2 在电化学惰性 ITO 载体上更好的分散，产生更小的催化剂颗粒，从而获得更高的表面积。载体上的大 IrO2 颗粒显着降低了电极性能。 TiO2和ITO作为载体材料的比较表明，60%的IrO2负载量能够覆盖载体表面并赋予催化剂足够的导电性。版权所有 (C) 2013，Hydrogen Energy Publications, LLC。由爱思唯尔有限公司出版。保留所有权利。
Indium tin oxide (ITO) was used as a support for IrO2 catalyst in the oxygen evolution reaction. IrO2 nanoparticles were deposited in various loading on commercially available ITO nanoparticle, 17-28 nm in size using the Adam's fusion method. The prepared catalysts were characterised using X-ray diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The BET surface area of the support (35 m(2)/g) was 3 times lower than the unsupported IrO2 (112.7 m(2)/g). The surface area and electronic conductivity of the catalysts were predominantly contributed by the IrO2. The supported catalysts were tested in a membrane electrode assembly (MEA) for electrolyser operation. The 90% IrO2-ITO gave similar performance (1.74 V@1 A/cm(2)) to that of the unsupported IrO2 (1.73 V@1 A/cm(2)) in the MEA polarisation test at 80 degrees C with Nafion 115 membrane which was attributed to a better dispersion of the active IrO2 on the electrochemically inactive ITO support, giving rise to smaller catalyst particle and thereby higher surface area. Large IrO2 particles on the support significantly reduced the electrode performance. A comparison of TiO2 and ITO as support material showed that, 60% IrO2 loading was able to cover the support surface and giving sufficient conductivity to the catalyst. Copyright (C) 2013, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.