在金属纳米结构中引发有序空位，以实现向空位巴洛堆积转变，从而实现高效析氢。
Evoking ordered vacancies in metallic nanostructures toward a vacated Barlow packing for high-performance hydrogen evolution.
作者信息
Zhang Zhicheng, Liu Guigao, Cui Xiaoya, Gong Yue, Yi Ding, Zhang Qinghua, Zhu Chongzhi, Saleem Faisal, Chen Bo, Lai Zhuangchai, Yun Qinbai, Cheng Hongfei, Huang Zhiqi, Peng Yongwu, Fan Zhanxi, Li Bing, Dai Wenrui, Chen Wei, Du Yonghua, Ma Lu, Sun Cheng-Jun, Hwang Inhui, Chen Shuangming, Song Li, Ding Feng, Gu Lin, Zhu Yihan, Zhang Hua
机构信息
Tianjin Key Laboratory of Molecular Optoelectronic Sciences, Department of Chemistry, School of Science, Tianjin University and Collaborative Innovation Center of Chemical Science and Engineering, Tianjin 300072, China.
Center for Programmable Materials, School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore.
出版信息
Sci Adv. 2021 Mar 24;7(13). doi: 10.1126/sciadv.abd6647. Print 2021 Mar.
Metallic nanostructures are commonly densely packed into a few packing variants with slightly different atomic packing factors. The structural aspects and physicochemical properties related with the vacancies in such nanostructures are rarely explored because of lack of an effective way to control the introduction of vacancy sites. Highly voided metallic nanostructures with ordered vacancies are however energetically high lying and very difficult to synthesize. Here, we report a chemical method for synthesis of hierarchical Rh nanostructures (Rh NSs) composed of ultrathin nanosheets, composed of hexagonal close-packed structure embedded with nanodomains that adopt a vacated Barlow packing with ordered vacancies. The obtained Rh NSs exhibit remarkably enhanced electrocatalytic activity and stability toward the hydrogen evolution reaction (HER) in alkaline media. Theoretical calculations reveal that the exceptional electrocatalytic performance of Rh NSs originates from their unique vacancy structures, which facilitate the adsorption and dissociation of HO in the HER.
金属纳米结构通常紧密堆积成几种具有略有不同原子堆积因子的堆积变体。由于缺乏控制空位引入的有效方法，与这种纳米结构中的空位相关的结构方面和物理化学性质很少被探索。然而，具有有序空位的高度多孔金属纳米结构在能量上处于高位，并且非常难以合成。在这里，我们报告了一种化学方法，用于合成由超薄纳米片组成的分级Rh纳米结构（Rh NSs），这些纳米片由六方密堆积结构组成，嵌入了采用有空位的巴洛堆积且具有有序空位的纳米域。所获得的Rh NSs在碱性介质中对析氢反应（HER）表现出显著增强的电催化活性和稳定性。理论计算表明，Rh NSs优异的电催化性能源于其独特的空位结构，这有利于HER中HO的吸附和解离。
Zotero 插件