Self-Reduction Synthesis of New MXene/Ag Composites with Unexpected Electrocatalytic Activity

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• 作者：Zhiwei Zhang ; Hanning Li ; Guodong Zou ; Carlos Fernandez ; Baozhong Liu ; Qingrui Zhang ; Jie Hu ; Qiuming Peng
• 刊名：ACS Sustainable Chemistry & Engineering
• 出版年：2016
• 出版时间：December 5, 2016
• 年：2016
• 卷：4
• 期：12
• 页码：6763-6771
• 全文大小：664K
• ISSN：2168-0485

文摘

Differing from graphene, the activated groups on the surface of layered two-dimensional titanium carbide (MXene) materials bestow superiority to self-assemble some novel MXene derivatives with intriguing chemical/physical properties. Here we first report a series of new MXene-Ag composites by directly mixing AgNO₃ and alkalization-intercalated MXene (alk-MXene, Ti₃C₂(OH/ONa)₂) solution containing polyvinylpyrrolidone (PVP) at room temperature, in which an analogous urchin-shaped MXene-Ag_0.9Ti_0.1 bimetallic nanowire composite exhibits unexpected electrocatalytic activity for the oxygen reduction reaction. The addition of PVP solution induces the formation of 5-fold nanotwin Ag seeds, which then grow into Ag/Ti (Ag_0.9Ti_0.1) bimetallic nanowires. The unique bimetallic nanowires favor a four-electron transfer process, and exhibit high current density and good stability by offering numerous oxygen adsorption sites and shortening the diffusion path of adsorbed oxygen. The results represent a new step for the electrocatalytic applications of MXene materials, and also motivate enthusiasm in the quest for new MXene derivations.