Wan Lei, Liu Jing, Xu Ziang, Xu Qin, Pang Maobin, Wang Peican, Wang Baoguo
The State Key Laboratory of Chemical Engineering, Department of Chemical Engineering, Tsinghua University, No.30 Shuang-Qing Road, Hai-Dian District, Beijing, 100084, P.R. China.
Small. 2022 May;18(21):e2200380. doi: 10.1002/smll.202200380. Epub 2022 May 1.
The design of high-performance and durable electrodes for the oxygen evolution reaction (OER) is crucial for pure-water-fed anion exchange membrane water electrolysis (AEMWE). In this study, an integrated electrode with vertically aligned ionomer-incorporated nickel-iron layered double hydroxide nanosheet arrays, used on one side of the liquid/gas diffusion layer, is fabricated for the OER. Transport highways in the fabricated integrated electrode, significantly improve the transport of liquid/gas, hydroxide ions, and electron in the anode, resulting in a high current density of 1900 mA cm at 1.90 V in pure-water-fed AEMWE. Specifically, three-electrode and single-cell measurement results indicate that an anion-exchange ionomer can increase the local OH concentration on the integrated electrodes surface and facilitate the OER for pure-water-fed AEMWE. This study highlights a new approach to fabricating and understanding electrode architecture with enhanced performance and durability for pure-water-fed AEMWE.
设计用于析氧反应（OER）的高性能且耐用的电极对于纯水进料的阴离子交换膜水电解（AEMWE）至关重要。在本研究中，制备了一种集成电极，该电极在液体/气体扩散层的一侧使用了垂直排列的含离子聚合物的镍铁层状双氢氧化物纳米片阵列用于OER。所制备的集成电极中的传输通道显著改善了阳极中液体/气体、氢氧根离子和电子的传输，在纯水进料的AEMWE中，在1.90 V时实现了1900 mA cm的高电流密度。具体而言，三电极和单电池测量结果表明，阴离子交换离子聚合物可以增加集成电极表面的局部OH浓度，并促进纯水进料的AEMWE的OER。本研究突出了一种制造和理解具有增强性能和耐用性的电极结构的新方法，用于纯水进料的AEMWE。
