美国佐治亚理工学院夏幼南团队介绍了铂族金属Janus纳米笼的制备及其作为高效双电催化剂的应用。相关研究成果发表在2021年2月18日出版的《德国应用化学》。

Janus纳米笼的外表面和内表面具有独特的铂族金属，可以自然地催化至少两种不同的反应。

该文中，研究人员开发了一种基于连续沉积然后选择性刻蚀纳米笼子的简便合成方法。研究团队已经制备了11种具有多孔、超薄、不对称壁特征的Janus纳米笼，其具有尺寸均匀、边界分明的{100}面，厚度可达1.6nm。当作为氧还原和析氧反应的双电催化剂进行测试时，基于Pt和Ir的Janus纳米笼表现出优异的活性，这取决于金属层的厚度和相对位置。

密度泛函理论研究表明，纳米笼的合金组分和表面结构通过调节关键反应中间体的稳定性，对提高电催化活性起着重要作用。

附：英文原文

Title: Janus Nanocages of Platinum‐Group Metals and Their Use as Effective Dual‐Electrocatalysts

Author: Jiawei Zhu, Xu Lang, Zhiheng Lyu, Minghao Xie, Ruhui Chen, Wanqin Jin, Manos Mavrikakis, Younan Xia

Issue&Volume: 2021-02-18

Abstract: Janus nanocages with distinctive platinum‐group metals on the outer and inner surfaces can naturally catalyze at least two different reactions. Here we report a general method based on successive deposition and then selective etching for the facile synthesis of such nanocages. We have fabricated 11 different types of Janus nanocages characterized by a uniform size and well‐defined {100} facets, together with porous, ultrathin, asymmetric walls up to 1.6 nm thick. When tested as dual‐electrocatalysts toward oxygen reduction and evolution reactions, the Janus nanocages based on Pt and Ir exhibited superior activities depending on the thickness and relative position of the metal layer. Density functional theory studies suggest that the alloy composition and surface structure of the nanocages both play important roles in enhancing the electrocatalytic activities by modulating the stability of key reaction intermediates.

DOI: 10.1002/anie.202102275

Source: https://onlinelibrary.wiley.com/doi/10.1002/anie.202102275