Suppression of current-induced membrane discharge of bipolar membranes by regulating ion crossover transport

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外文摘要：Bipolar membranes(BPMs)exhibit the unique capability to regulate the operating environment of elec-trochemical system through the water dissociation-combination processes.However,the industrial uti-lization of BPMs is limited by instability and serious energy consumption.The current-induced membrane discharge(CIMD)at high-current conditions has a negative influence on the performance of anion-exchange membranes,but the underlying ion transport mechanisms in the BPMs remain unclear.Here,the CIMD-coupled Poisson-Nernst-Planck(PNP)equations are used to explore the ion transport mechanisms in the BPMs for both reverse bias and forward bias at neutral and acid-base con-ditions.It is demonstrated that the CIMD effect in the reverse-bias mode can be suppressed by enhancing the diffusive transport of salt counter-ions(Na+and Cl-)into the BPMs,and that in the forward-bias mode with acid-base electrolytes can be suppressed by matching the transport rate of water counter-ions(H3O+and OH-).Suppressing the CIMD can promote the water dissociation in the reverse-bias mode,as well as overcome the plateau of limiting current density and reduce the interfacial blockage of salt co-ions(CI-)in the anion-exchange layer in the forward-bias mode with acid-base electrolytes.Our work highlights the importance of regulating ion crossover transport on improving the performance of BPMs.

外文关键词：

Bipolar membranesCurrent-induced membrane dischargeSalt ion crossoverDiffusion-migration-reaction process

作者：

Tingting Yu、Haolan Tao、Jingkun Li、Cheng Lian、Honglai Liu

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作者单位：

State Key Laboratory of Chemical Engineering,Shanghai Engineering Research Center of Hierarchical Nanomaterials,School of Chemical Engineering,East China University of Science and Technology,Shanghai 200237,China

School of Chemistry and Molecular Engineering,East China University of Science and Technology,Shanghai 200237,China

基金：

National Key R&D Program of ChinaFundamental Research Funds for the Central UniversitiesFundamental Research Funds for the Central UniversitiesNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaShanghai Pilot Program for Basic ResearchPostdoctoral Fellowship Program of CPSF

项目编号：

2022YFB46021012022ZFJH0042024SMECP05222781272237811222T01400100-18GZC20230801

出版年：

2024

DOI：

10.1016/j.jechem.2024.05.011

能源化学

中国科学院大连化学物理研究所中国科学院成都有机化学研究所

能源化学

CSTPCDEI

影响因子：0.654

ISSN：2095-4956

年,卷(期)：2024.96(9)