Wang Zhu-Jun, Liang Zhihua, Kong Xiao, Zhang Xiaowen, Qiao Ruixi, Wang Jinhuan, Zhang Shuai, Zhang Zhiqun, Xue Chaowu, Cui Guoliang, Zhang Zhihong, Zou Dingxin, Liu Zhi, Li Qunyang, Wei Wenya, Zhou Xu, Tang Zhilie, Yu Dapeng, Wang Enge, Liu Kaihui, Ding Feng, Xu Xiaozhi
Guangdong Provincial Key Laboratory of Quantum Engineering and Quantum Materials, School of Physics and Telecommunication Engineering, South China Normal University, Guangzhou 510631, People's Republic of China.
Guangdong-Hong Kong Joint Laboratory of Quantum Matter, South China Normal University, Guangzhou 510631, People's Republic of China.
Nano Lett. 2022 Jun 22;22(12):4661-4668. doi: 10.1021/acs.nanolett.2c00549. Epub 2022 May 31.
Confined nanospaces provide a new platform to promote catalytic reactions. However, the mechanism of catalytic enhancement in the nanospace still requires insightful exploration due to the lack of direct visualization. Here, we report investigations on the etching and growth of graphene in a two-dimensional (2D) confined space between graphene and a Cu substrate. We observed that the graphene layer between the Cu and top graphene layer was surprisingly very active in etching (more than 10 times faster than the etching of the top graphene layer). More strikingly, at a relatively low temperature (∼530 °C), the etched carbon radicals dissociated from the bottom layer, in turn feeding the growth of the top graphene layer with a very high efficiency. Our findings reveal the dynamics of the anomalous confined catalytic processes in 2D confined spaces and thus pave the way for the design of high-efficiency catalysts.
受限纳米空间为促进催化反应提供了一个新平台。然而，由于缺乏直接可视化手段，纳米空间中催化增强的机制仍需要深入探索。在此，我们报告了对石墨烯在石墨烯与铜衬底之间的二维（2D）受限空间中的蚀刻和生长的研究。我们观察到，铜与顶部石墨烯层之间的石墨烯层在蚀刻方面出奇地活跃（比顶部石墨烯层的蚀刻速度快10倍以上）。更引人注目的是，在相对较低的温度（约530°C）下，从底层解离的蚀刻碳自由基反过来以非常高的效率促进顶部石墨烯层的生长。我们的发现揭示了二维受限空间中异常受限催化过程的动力学，从而为高效催化剂的设计铺平了道路。
