Co@Co Cages Engineered from Hollowing MOFs for Enhanced Hydrogen Evolution Reaction Performance.
Co@Co Cages Engineered from Hollowing MOFs for Enhanced Hydrogen Evolution Reaction Performance.
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DOI：
10.1021/acs.jpclett.3c01287
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发表时间：
2023-06
期刊：
影响因子：
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通讯作者：
Chuangwei Jiao;Zetan Cao;Jia He;Zhiwen Liu;Cheng Zheng;Simin Peng;Bin Chen
中科院分区：
文献类型：
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作者：
Chuangwei Jiao;Zetan Cao;Jia He;Zhiwen Liu;Cheng Zheng;Simin Peng;Bin Chen
金属有机框架（MOFs）的中空工程的进展已经在催化剂、传感器和电池中实现了各种应用，但是中空衍生物通常限于氢氧化物、氧化物、硒化物和硫化物，并且存在来自环境的额外元素。在这里，我们已经成功地合成了空心金属Co@Co笼通过一个简单的两步策略。有趣的是，具有少量残余碳的Co@Co（C）笼由于丰富的暴露的活性中心和快速的电荷转移而显示出优异的催化性能。在10 mA cm-2的电流密度下，Co@Co（C）电极的析氢过电位最低可达54 mV，接近Pt/C电极的38 mV。两步合成策略为增加催化活性位点的数量和电荷/质量转移速率提供了机会，同时将材料利用率的限制推到现有基于MOF的纳米结构中所实现的范围之外。
Advances in hollow engineering of metal-organic frameworks (MOFs) have enabled a variety of applications in catalysts, sensors, and batteries, but the hollow derivatives are often limited to hydroxides, oxides, selenides, and sulfides with the presence of additional elements from the environment. Here we have successfully synthesized hollow metallic Co@Co cages through a facile two-step strategy. Interestingly, the Co@Co(C) cages with a small amount of residual carbon show excellent catalytic performance due to the abundant exposed active sites and fast charge transfer. During the hydrogen evolution reaction, the overpotential of Co@Co(C) is as low as ∼54 mV at the current density of 10 mA cm-2, which is close to that of ∼38 mV for the Pt/C electrodes. The two-step synthesis strategy opens up opportunities for increasing the number of catalytic active sites and rates of charge/mass transfer while pushing the limits of materials utilization beyond that achieved in existing MOF-based nanostructures.