A highly stable Cu(OH)2-Poly(vinyl alcohol) nanocomposite membrane for dramatically enhanced direct borohydride fuel cell performance

Chu, Wen; He, Yan; Chu, Yong S.; Meng, Liang; Liu, Jiabin; Qin, Haiying; Tao, Shanwen

doi:10.1016/j.jpowsour.2020.228312

Title: A highly stable Cu(OH)₂-Poly(vinyl alcohol) nanocomposite membrane for dramatically enhanced direct borohydride fuel cell performance

Journal Article · Sat Aug 01 00:00:00 EDT 2020 · Journal of Power Sources

DOI:https://doi.org/10.1016/j.jpowsour.2020.228312· OSTI ID:1638799

Chu, Wen ^[1]; He, Yan ^[2]; Chu, Yong S. ^[3]; Meng, Liang ^[1]; Liu, Jiabin ^[1]; Qin, Haiying ^[4]; Tao, Shanwen ^[5]

Zhejiang Univ., Hangzhou (China)
Chinese Academy of Sciences (CAS), Shanghai (China)
Brookhaven National Lab. (BNL), Upton, NY (United States). National Synchrotron Light Source II (NSLS-II)
Hangzhou Dianzi Univ., Hangzhou (China)
Univ. of Warwick (United Kingdom)

Nano-additive aggregation, limited performance, and unclear modification mechanisms are the main obstacles in developing nanocomposite anion exchange membranes (AEMs). In this work, for the first time, an effective and highly stable Poly(vinyl alcohol) (PVA)-based AEMs with dispersive Cu(OH)$$_2$$ nanoclusters (Cu-AEMs) are prepared by a simple and eco-friendly three-step method: ‘CuCl$$_2$$ doping-casting-KOH immersing’. The doped Cu$$^{2+}$$ ions chemically combine with OH- ions to form anionic conductive Cu(OH)2 nanoclusters intermediated by attaching resins. The PVA skeletons wrap around Cu(OH)$$_2$$ while the hydroxyl groups expose to bulk water, forming Cu(OH)$$_2$$-PVA complex, which avoids nano-additive aggregation, increases anionic channels, and strengthens additive-matrix connection. A direct borohydride fuel cell using Cu-AEM with 0.56 wt % CuCl$$_2$$ possess the highest power density of 403.3 mW cm$$^{-2}$$ at 60 °C and a life span of over 200 h. The high-performance and durability come from the unique structure of Cu(OH)$$_2$$ nanoclusters-PVA complex. ‘Vehicle’ theory is considered to be the dominant mechanism for enhancing such nanocomposite Cu-AEMs. This work demonstrates a new concept for preparing the stable AEMs toward high-performance fuel cells. The synthetic chemistry involved can be broadly extended for fabricating versatile AEMs.

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Research Organization:: Brookhaven National Lab. (BNL), Upton, NY (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0012704

OSTI ID:: 1638799

Report Number(s):: BNL-216124-2020-JAAM

Journal Information:: Journal of Power Sources, Vol. 467; ISSN 0378-7753

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 6 works

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