Self-repairing hybrid nanosheet anode catalysts for alkaline water electrolysis connected with fluctuating renewable energy
Self-repairing hybrid nanosheet anode catalysts for alkaline water electrolysis connected with fluctuating renewable energy
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DOI：
10.1016/j.electacta.2019.134812
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发表时间：
2019-11-10
影响因子：
6.6
通讯作者：
Mitsushima, Shigenori
中科院分区：
文献类型：
--
作者：
Kuroda, Yoshiyuki;Nishimoto, Takeshi;Mitsushima, Shigenori
水电解是可再生能源制氢的核心技术，可用于能源的储存和运输。碱性水电解（AWE）是最合适的技术之一，因为它的成本低，适用于大规模生产氢;然而，AWE系统表现出电极降解波动的电力从可再生能源，如太阳能和风能。在这项研究中，我们证明了使用的混合钴纳米片（Co-NS），包括水镁石型氢氧化钴改性的三脚架配体三（羟甲基）氨基甲烷，形成一个高度稳定的自修复催化剂层的镍阳极循环电位下。Co-ns通过有机改性功能化，作为自修复催化剂，具有高催化活性，在碱性电解质中的高稳定性，并保护镍阳极免受腐蚀。由碱性电解质提供的Co-ns通过阳极反应在镍阳极的表面上形成催化剂层。该催化剂层在模拟可再生能源的波动电力的循环电位下分离;然而，它通过模拟AWE的稳态操作的恒定电流电解来修复。Co-ns与镍阳极之间的反应加强了催化剂层与基底之间的连接。此外，Co-ns对商业阴极的活性影响较小，表明在不改变歧管结构的情况下适用于常规AWE系统。因此，特别设计的Co-ns催化剂显示出巨大的潜力，作为一种新的自修复功能，在AWE系统，这将使稳定的操作下波动的电力从可再生能源。(C)2019爱思唯尔有限公司版权所有。
Water electrolysis is a core technology in the conversion of renewable energy to hydrogen, which is useful for energy storage and transportation. Alkaline water electrolysis (AWE) is one of the most suitable technologies because of its low cost and applicability to large-scale production of hydrogen; however, the AWE system exhibits electrode degradation under fluctuating electricity from renewable energy such as solar and wind energies. In this study, we demonstrate the use of a hybrid cobalt nanosheet (Co-ns), comprising brucite-type cobalt hydroxide modified with the tripodal ligand tris(hydroxymethyl)aminomethane, to form a highly stable self-repairing catalyst layer on a nickel anode under cycled potential. The Co-ns is functionalized by organic modification as a self-repairing catalyst with high catalytic activity, high dispersibility in an alkaline electrolyte, and protection of the nickel anode from corrosion. The Co-ns supplied from the alkaline electrolyte forms a catalyst layer via the anodic reaction on the surface of the nickel anode. This catalyst layer is detached under cycled potential simulating the fluctuating electricity of renewable energy; however, it is repaired by the constant current electrolysis simulating the steady state operation of AWE. The reaction between the Co-ns and nickel anode strengthens the connection between the catalyst layer and substrate. Furthermore, the Co-ns is less influential to the activity of a commercial cathode, indicating applicability to the conventional AWE system without changing the manifold structure. Consequently, the specially designed Co-ns catalyst shows great potential as a novel self-repairing function in an AWE system, which will enable stable operation under fluctuating electricity from renewable energy. (C) 2019 Elsevier Ltd. All rights reserved.