Superlattice in a Ru superstructure for enhancing hydrogen evolution.
Superlattice in a Ru superstructure for enhancing hydrogen evolution.
复制标题
DOI：
10.1002/anie.202116867
复制
发表时间：
2022-01
影响因子：
--
通讯作者：
Xiaoqing Huang
中科院分区：
文献类型：
--
作者：
Xiaoqing Huang
超晶格由于其独特的物理和化学性质而引起了人们的广泛关注。然而，超晶格的观察主要局限于那些层间相互作用较弱的层状结构，并且超晶格对金属基纳米结构中催化作用的影响在很大程度上尚未被探索。在此，我们首次报道了一种简单的湿化学方法用于合成具有超晶格的二维（2D）Ru多层纳米片（Ru MNS），并证明了超晶格对增强电催化的显著影响。详细的表征表明，超晶格是由相邻Ru层以2 ° ~ 30 °的扭曲角堆叠而成的。由于相邻层之间的强烈协同作用，具有超晶格结构的Ru纳米结构可作为碱性析氢反应（HER）的高效催化剂，其过电位为2 4 mV，达到10 mA cm-2，低于Ru纳米结构（6 1 mV）和商用Pt/C（70 mV）。理论计算表明，相邻Ru层之间的超晶格可以产生应变效应，导致晶格收缩，削弱对H的吸附能力，从而提高HER性能。本工作不仅制备了金属基超晶格，而且为利用超晶格增强金属基材料的催化性能提供了新的思路。
Superlattice has attracted extensive research attentions due to their unique physical and chemical properties. Nevertheless, the observations of superlattice are mainly limited to those layered structures with weak interlayered interactions, and the effect of superlattice on catalysis in metal-based nanostructures is largely unexplored yet. Herein, for the first time we report a facile wet-chemical method for synthesizing two-dimensional (2D) Ru multilayered nanosheets (Ru MNSs) with superlattice, and demonstrate the significant impact of superlattice on enhancing electrocatalysis. Detailed characterizations reveal that the superlattice is formed by stacking the adjacent Ru layers with twisted angles from 2 o to 30 o . Owing to the strong synergy between the adjacent layers, Ru MNSs with superlattice can serve as high-efficiency catalyst for alkaline hydrogen evolution reaction (HER), where the overpotential is 24 mV for reaching 10 mA cm -2 , which is lower than those of Ru NSs (61 mV) and commercial Pt/C (70 mV). Theoretical calculations reveal that superlattice between the adjacent Ru layers can induce the strain effect, leading to the lattice contraction and the weakening *H adsorption ability, as a result of improved HER performance. This work not only fabricates the metal-based superlattice, but also sheds new light on the utilization of superlattice on enhancing catalysis in metal-based materials.