Liu Shan, Sun Ya-Ya, Wu Ya-Pan, Wang Yan-Jiang, Pi Qiu, Li Shuang, Li Yong-Shuang, Li Dong-Sheng
College of Material and Chemical Engineering, Key Laboratory of Inorganic Nonmetallic Crystalline and Energy Conversion Materials, China Three Gorges University, Yichang 443002, China.
ACS Appl Mater Interfaces. 2021 Jun 9;13(22):26472-26481. doi: 10.1021/acsami.1c04282. Epub 2021 May 24.
Developing efficient metal-organic framework (MOF)-based electrocatalysts with improvable activity and persistence toward the methanol oxidation reaction (MOR) is attracting great research attention but still remains an enormous challenge. Herein, a facile strategy, hydrangea-shaped nickel hydroxide template-directed synthesis of the hierarchically structured Ni-MOF on the Ni(OH) heterocomposite (denoted as Ni-Ni) for efficient MOR, is developed. The unique hierarchical structure and synergistic effect of the heterocomposite afford more exposed active sites, a facile ion diffusion path, and improved conductivity, favorable for improving MOR catalytic performance. Remarkably, the optimized Ni-Ni-2 material delivers an excellent activity with a high peak current density (24.6 mA cm). Furthermore, to prove the universality of this strategy, NiCu(OH) isometallic hydroxide was used as the precursor, and a series of MOF-74/CuNi(OH) (denoted as Ni-NiCu) heterogeneous materials have been prepared and could be used as an effective electrocatalyst to catalyze MOR. The results indicate that this strategy can be used in the synthesis of other new composite materials with specific hierarchical structures for a more efficient electrocatalytic system.
开发具有可提高的活性和对甲醇氧化反应（MOR）的持久性的高效金属有机框架（MOF）基电催化剂正吸引着大量研究关注，但仍然是一个巨大的挑战。在此，开发了一种简便的策略，即通过绣球花状氢氧化镍模板导向合成Ni(OH)异质复合材料上的分层结构Ni-MOF（表示为Ni-Ni）用于高效MOR。异质复合材料独特的分层结构和协同效应提供了更多暴露的活性位点、便捷的离子扩散路径以及改善的导电性，有利于提高MOR催化性能。值得注意的是，优化后的Ni-Ni-2材料具有优异的活性，具有高的峰值电流密度（24.6 mA cm）。此外，为了证明该策略的通用性，使用NiCu(OH)等金属氢氧化物作为前驱体，制备了一系列MOF-74/CuNi(OH)（表示为Ni-NiCu）异质材料，并且可以用作催化MOR的有效电催化剂。结果表明，该策略可用于合成具有特定分层结构的其他新型复合材料，以构建更高效的电催化体系。
