Exploring the role of solvents in structural regulation during ultrasonic synthesis of Co/Ni-layered double hydroxide for oxygen evolution reaction

材料导报:能源(英文) Pub Date : 2024-11-01 DOI:10.1016/j.matre.2024.100296

Zhaojin Li, Qian Ma, Zezhao Li, Di Zhang, Qujiang Sun, Qiujun Wang, Huilan Sun, Bo Wang

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Abstract

Cobalt-based layered double hydroxides (LDHs) are highly sought after by researchers due to their low-cost, high efficiency and stability for oxygen evolution reaction (OER) in water electrolysis. The OER performance of these LDHs is closely related to their morphology and electronic structure. However, there is a lack of theory on how to control reaction conditions to regulate the morphologies. In this paper, the growth mechanism of LDH prepared in different solvents is thoroughly studied. Consequently, the Co/Ni-LDHs exhibiting a 3D hierarchical flower-like structure were synthesized with normal alcohol as a solvent, meanwhile, the thickness of the LDHs can be controlled by the molecular weight of the normal alcohol. By adjusting the suitable Co/Ni ratio and solvent, the Co/Ni0.050-LDH-Me was synthesized and exhibited excellent OER performance. At 10 mA cm⁻², the overpotential of Co/Ni0.050-LDH-Me is 307 mV, and the Tafel slope is 76.5 mV dec⁻¹.

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探讨溶剂在超声合成Co/ ni层双氢氧化物析氧反应中的结构调节作用

钴基层状双氢氧化物（LDHs）因其低成本、高效和稳定的析氧反应（OER）而受到研究人员的广泛关注。这些低密度聚合物的OER性能与其形貌和电子结构密切相关。然而，如何通过控制反应条件来调控其形貌，目前还缺乏理论依据。本文对LDH在不同溶剂中的生长机理进行了深入的研究。因此，以正醇为溶剂合成了具有三维分层花状结构的Co/Ni-LDHs，其厚度可由正醇的分子量控制。通过调整合适的Co/Ni比和溶剂，合成了Co/Ni0.050-LDH-Me，并取得了优异的OER性能。在10 mA cm−2时，Co/Ni0.050-LDH-Me过电位为307 mV， Tafel斜率为76.5 mV / dec−1。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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