Activity and Stability of Electrochemically and Thermally Treated Iridium for the Oxygen Evolution Reaction
Activity and Stability of Electrochemically and Thermally Treated Iridium for the Oxygen Evolution Reaction
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DOI：
10.1149/2.0181611jes
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发表时间：
2016-01-01
影响因子：
3.9
通讯作者：
Cherevko, Serhiy
中科院分区：
文献类型：
--
作者：
Geiger, Simon;Kasian, Olga;Cherevko, Serhiy
铱是现代质子交换膜水电解槽（PEMWE）析氧反应（OER）催化剂中的主要元素，这主要是由于其在恶劣的PEMWE条件下具有较好的活性和可耐受的稳定性。然而，铱含量有限，限制了这些装置的广泛应用，特别是在可再生能源的大规模转换和储存方面。在这项工作中，我们研究了是否可以通过在不同温度下对催化剂进行热处理来微调铱的电催化性能。研究了两种不同铱电极（电子束物理气相沉积法制备的金属铱平面表面和电化学法制备的多孔氧化铱水合膜）的OER活性和溶解性。应用退火温度范围为100℃-600℃，温度越高，活性越低，稳定性越高。然而，在这一趋势中可以观察到许多奇特之处。考虑到氧化物结构、形态和电导率的变化，对这些问题进行了讨论。(C)作者2016。由ECS出版。版权所有。
Iridium is the main element in modern catalysts for the oxygen evolution reaction (OER) in proton exchange membrane water electrolyzers (PEMWE), which is predominantly due to its relatively good activity and tolerable stability in harsh PEMWE conditions. Limited abundance of iridium, however, poses limitations on widespread applications of these devices, in particular in the large scale conversion and storage of renewable energy. In this work we investigate if the electrocatalytic performance of iridium can be fine-tuned by thermal treatment of catalysts at different temperatures. The OER activity and the dissolution of two different iridium electrodes, viz. (a) flat metallic iridium surfaces prepared by electron beam physical vapor deposition (EBPVD) and (b) electrochemically prepared porous hydrous iridium oxide films (HIROF) are studied. The range of applied annealing temperatures is 100 degrees C-600 degrees C, with a general trend of decreasing activity and increasing stability the higher the temperature. Numerous peculiarities in the trend are however observed. These are discussed considering variations of oxide structure, morphology and electronic conductivity. (C) The Author(s) 2016. Published by ECS. All rights reserved.