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富勒烯片段重组:空间接近如何塑造缺陷丰富的碳电催化剂

Ning Li¹, Kun Guo¹, Mengyang Li²

¹State Key Laboratory of Materials Processing and Die & Mould Technology, School of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China.

Journal of the American Chemical Society

|November 3, 2023

概括

富勒烯转化过程中的空间限制对碳电催化剂的缺陷形成产生了重大影响. 不受限制的富勒烯碎片形成了优质的sp2杂交纳米片,具有氧降解反应的内在缺陷.

科学领域:

材料科学
电化学
纳米技术

背景情况:

富勒烯转化是制造富含缺陷的碳电催化剂的关键方法.
了解这一过程中的碳键动态对于控制缺陷状态至关重要.

研究的目的:

研究分解富勒在空间上的近距离对结合重塑和电催化性能的影响.
为提高电催化剂性能制定一个空间调整的全重组战略.

主要方法:

使用涉及球 (SiO2) 的硬模板策略来控制烯 (C60) 化和重组.
使用铜中毒和密度功能理论 (DFT) 计算来确定活性位点和反应机制.
使用液和石英管封闭方法验证了空间调节的重组.

主要成果:

封闭的C60碎片形成了sp3键,阻碍了电子转移和活性位点暴露.
不受限制的C60碎片重组为具有高密度内在缺陷的sp2混合纳米片.
优化的催化剂通过4e-路径实现了0.82V半波潜力以减少氧.
DFT的计算证实了基底平面中的五角形减少了O2解离能量障碍.

结论:

在富勒烯转化过程中的空间限制决定了缺陷的形成和电催化活性.
内部缺陷,特别是五角形,是氧气减少的活跃地点.
这种空间调节的重组为设计先进的碳电催化剂提供了新的途径.

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