Layered double hydroxide-based electrocatalysts for the oxygen evolution reaction: identification and tailoring of active sites, and superaerophobic nanoarray electrode assembly.
Layered double hydroxide-based electrocatalysts for the oxygen evolution reaction: identification and tailoring of active sites, and superaerophobic nanoarray electrode assembly.
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DOI：
10.1039/d1cs00186h
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发表时间：
2021-06
影响因子：
46.2
通讯作者：
Daojin Zhou;Pengsong Li;Xiao Lin;Adam McKinley;Y. Kuang;Wen Liu;Wen-Feng Lin;Xiaoming Sun
中科院分区：
文献类型：
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作者：
Daojin Zhou;Pengsong Li;Xiao Lin;Adam McKinley;Y. Kuang;Wen Liu;Wen-Feng Lin;Xiaoming Sun
电催化析氧反应(OER)是电解水制氢的关键半电池反应。然而，实际的OER存在动力学迟缓的问题，因此需要高效的电催化剂。过渡金属基层状双氢氧化物(LDHs)是OER催化剂中活性最高的一类。深入了解LDH基电催化剂的活性，有助于进一步合理设计和调节高性能电催化剂的活性中心。本文首先阐述了对LDHs结构特征的基本认识，然后对LDHs在碱性介质中作为高活性OER催化剂的最新进展进行了比较和深入的讨论，包括实验方法和计算方法。在原子尺度上对LDHs的活性中心进行鉴定和结构表征的基础上，总结了提高OER活性的策略，包括掺杂、插层和缺陷制造。此外，还探索了对析气电极性能有深远影响的超疏空气概念，以增强LDHs及其衍生物的大规模OER。此外，还提出了一些OER测量的操作标准，以避免在评估LDHs的OER活性时出现不一致的情况。最后，重点介绍了LDHs作为大规模分水负极材料所面临的几个关键挑战，如稳定性问题和采用膜电极组装电解槽等，为今后的研究方向指明了方向。
The electrocatalytic oxygen evolution reaction (OER) is a critical half-cell reaction for hydrogen production via water electrolysis. However, the practical OER suffers from sluggish kinetics and thus requires efficient electrocatalysts. Transition metal-based layered double hydroxides (LDHs) represent one of the most active classes of OER catalysts. An in-depth understanding of the activity of LDH based electrocatalysts can promote further rational design and active site regulation of high-performance electrocatalysts. In this review, the fundamental understanding of the structural characteristics of LDHs is demonstrated first, then comparisons and in-depth discussions of recent advances in LDHs as highly active OER catalysts in alkaline media are offered, which include both experimental and computational methods. On top of the active site identification and structural characterization of LDHs on an atomic scale, strategies to promote the OER activity are summarised, including doping, intercalation and defect-making. Furthermore, the concept of superaerophobicity, which has a profound impact on the performance of gas evolution electrodes, is explored to enhance LDHs and their derivatives for a large scale OER. In addition, certain operating standards for OER measurements are proposed to avoid inconsistency in evaluating the OER activity of LDHs. Finally, several key challenges in using LDHs as anode materials for large scale water splitting, such as the issue of stability and the adoption of membrane-electrode-assembly based electrolysers, are emphasized to shed light on future research directions.