Single-layer graphene as a highly selective barrier for vanadium crossover with high proton selectivity  

作　　者：Saheed Bukola Zhaodong Li Jason Zack Christopher Antunes Carol Korzeniewski Glenn Teeter Jeffrey Blackburn Bryan Pivovar 

机构地区：[1]National Renewable Energy Laboratory(NREL),80401 Golden,United States [2]Department of Chemistry,Texas Tech University,79409 Lubbock,United States*Corresponding author(email:[e-mail]

出　　处：《Journal of Energy Chemistry》2021年第8期419-430,I0009,共13页能源化学（英文版）

摘　　要：We report near-zero crossover for vanadium cross-permeation through single-layer graphene immobilized at the interface of two Nafion?polymer electrolyte membranes.Vanadium ion diffusion and migration,including proton mobility through membrane composites,were studied with and without graphene under diffusion and migration conditions.Single-layer graphene was found to effectively inhibit vanadium ion diffusion and migration under specific conditions.The single-layer graphene composites also enabled remarkable ion transmission selectivity improvements over pure Nafion membranes,with proton transport being four orders of magnitude faster than vanadium ion transport.Resistivity values of 0.02±0.005Ωcm^(2) for proton and 223±4Ωcm^(2) for vanadium ion through single atomic layer graphene are reported.This high selectivity may have significant impact on flow battery applications or for other electrochemical devices where proton conductivity is required,and transport of other species is detrimental.Our results emphasize that crossover may be essentially completely eliminated in some cases,enabling for greatly improved operational viability.

关 键 词：Ion selectivity Polymer electrolyte membrane Redox flow battery Single-layer graphene Vanadium crossover 2D nanomaterial 

分 类 号：TM912[电气工程—电力电子与电力传动] TQ127.11[化学工程—无机化工]