中国科学院沈阳金属研究所的任文才研究团队发现了一种CdPS₃纳米片基薄膜，该薄膜通过镉（Cd）空位实现了高质子电导率。这一研究成果发表于2020年10月30日出版的《科学》上。

该课题组报道了一种由二维过渡金属三硫化磷纳米片组成的薄膜，其中过渡金属的空位使材料具有异常高的离子电导率。Cd_0.85PS₃Li_0.15H_0.15膜在90 °C、98%的相对湿度下表现出约0.95 S/cm、以质子传导为主的导电性。这种性能主要源自丰富的质子给体中心、容易的质子解吸和镉空位诱导的良好的水合作用。该课题组还在Cd_0.85PS₃Li_0.3和Mn_0.77PS₃Li_0.46膜中观察到超高的锂离子电导率。

据悉，湿润条件下纳米孔道中的质子传输对于能量存储和转换方面的应用至关重要，但包括Nafion膜在内的现有材料电导率最高仅0.2 S/cm。

附：英文原文

Title: CdPS3 nanosheets-based membrane with high proton conductivity enabled by Cd vacancies

Author: Xitang Qian, Long Chen, Lichang Yin, Zhibo Liu, Songfeng Pei, Fan Li, Guangjin Hou, Shuangming Chen, Li Song, Khalid Hussain Thebo, Hui-Ming Cheng, Wencai Ren

Issue&Volume: 2020/10/30

Abstract: Proton transport in nanochannels under humid conditions is crucial for the application in energy storage and conversion. However, existing materials, including Nafion, suffer from limited conductivity of up to 0.2 siemens per centimeter. We report a class of membranes assembled with two-dimensional transition-metal phosphorus trichalcogenide nanosheets, in which the transition-metal vacancies enable exceptionally high ion conductivity. A Cd0.85PS3Li0.15H0.15 membrane exhibits a proton conduction dominant conductivity of ~0.95 siemens per centimeter at 90° Celsius and 98% relative humidity. This performance mainly originates from the abundant proton donor centers, easy proton desorption, and excellent hydration of the membranes induced by cadmium vacancies. We also observed superhigh lithium ion conductivity in Cd0.85PS3Li0.3 and Mn0.77PS3Li0.46 membranes.

DOI: 10.1126/science.abb9704

Source: https://science.sciencemag.org/content/370/6516/596