气候变化领域集成服务门户(CCPortal): Oriented proton-conductive nano-sponge-facilitated polymer electrolyte membranes

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DOI	10.1039/c9ee03301g
	Oriented proton-conductive nano-sponge-facilitated polymer electrolyte membranes
	Liu X.; Zhang J.; Zheng C.; Xue J.; Huang T.; Yin Y.; Qin Y.; Jiao K.; Du Q.; Guiver M.D.
发表日期	2020
ISSN	1754-5692
起始页码	297
结束页码	309
卷号	13 期号:1
英文摘要	Achieving high power output from proton exchange membrane fuel cells (PEMFCs) requires efficient proton transport in proton exchange membranes (PEMs). Since proton conductivity is closely related to membrane moisture content, operation at low relative humidity (RH) and elevated temperature has become a critical bottleneck for the practical application of PEMFCs due to severe PEM dehydration. While several strategies have sought to mitigate this, including external thermal and water management, coating of nano-cracked hydrophobic layers and optimization of membrane intrinsic water retention, only partial improvements have been realized. Here, using a membrane formulation of ferrocyano-coordinated poly(4-vinylpyridine) (CP4VP), phosphotungstic acid (PWA) and polysulfone (PSf), novel highly water-retentive PEMs are fabricated via a strong magnetic field. During magnetic-assisted membrane casting, CP4VP and PWA form a microporous Prussian blue analogue (PBA) framework with the new type of Fe-CN-W bonding, which is paramagnetic and is thus simultaneously aligned in the through-plane (TP) direction of the membrane. The neutral PSf membrane component affords mechanical strength to the embedded TP-aligned conducting channels. This new type of microporous PBA framework is highly hydrophilic and proton conductive, with micropores of ∼5.4 Å diameter, which act as nano-sponges to absorb only more retentive non-freezable water, effective for proton conduction. These nano-sponges display efficient water absorption and retention at low RH and elevated temperatures, together with a much faster hydration process than the dehydration process. Furthermore, the TP-aligned PBA channels also enable faster water transport to promote PEM proton conduction beyond any previously reported water-retentive membrane. Consequently, the novel nano-sponge-like PEMs exhibit remarkable performance in both ex situ and in situ evaluations, especially at low RH and elevated temperature, largely prevailing over the commercial benchmark Nafion® 212. © 2020 The Royal Society of Chemistry.
语种	英语
scopus关键词	Benchmarking; Dehydration; Membranes; Microporosity; Polyelectrolytes; Water absorption; Low relative humidities; Optimization of membranes; Polymer electrolyte membranes; Proton exchange membrane fuel cell (PEMFCs); Proton exchange membranes; Prussian blue analogues; Strong magnetic fields; Thermal and water management; Proton exchange membrane fuel cells (PEMFC); absorption; coating; dehydration; electrical conductivity; electrolyte; electron; nanocomposite; optimization; relative humidity
来源期刊	Energy and Environmental Science
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/162653
作者单位	State Key Laboratory of Engines, Tianjin University, Tianjin, 300072, China; State Key Laboratory of Separation Membranes and Membrane Processes, Tianjin Polytechnic University, Tianjin, 300387, China; Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin, 300072, China
推荐引用方式 GB/T 7714	Liu X.,Zhang J.,Zheng C.,et al. Oriented proton-conductive nano-sponge-facilitated polymer electrolyte membranes[J],2020,13(1).
APA	Liu X..,Zhang J..,Zheng C..,Xue J..,Huang T..,...&Guiver M.D..(2020).Oriented proton-conductive nano-sponge-facilitated polymer electrolyte membranes.Energy and Environmental Science,13(1).
MLA	Liu X.,et al."Oriented proton-conductive nano-sponge-facilitated polymer electrolyte membranes".Energy and Environmental Science 13.1(2020).