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Bilayer Anion-Exchange Membrane with Low Borohydride Crossover and Improved Fuel Efficiency for Direct Borohdyride Fuel Cell

Journal Article · · ACS Applied Materials and Interfaces
 [1];  [1];  [2];  [1];  [1];  [1];  [1];  [3];  [4];  [5];  [2]
  1. Hangzhou Dianzi Univ. (China)
  2. Zhejiang Univ., Hangzhou (China)
  3. Chinese Academy of Sciences (CAS), Shanghai (China)
  4. Brookhaven National Lab. (BNL), Upton, NY (United States). National Synchrotron Light Source II (NSLS-II)
  5. Nanjing Forestry Univ. (China)

The development of membranes with low fuel crossover and high fuel efficiency is a key issue in direct borohydride fuel cells (DBFCs). In previous work, we produced a poly(vinyl alcohol) (PVA)-anion-exchange resin (AER) membrane with a low fuel crossover and a low fuel efficiency by introducing Co ions. In this work, a bilayer membrane was designed to improve the fuel efficiency and cell performance. The bilayer membrane was prepared by casting a PVA-AER wet gel onto the partially desiccated Co-PVA-AER gel. The bilayer membrane showed a borohydride permeability of 1.34 × 10–6 cm2·s–1, which was even lower than that of the Co-PVA-AER membrane (1.98 ×10–6 cm2·s–1) and the PVA-AER membrane (2.80 × 10–6 cm2·s–1). The DBFC using the bilayer membrane exhibited a higher fuel efficiency (37.4%) and output power (1.73 Wh) than the DBFCs using the Co-PVA-AER membrane (33.3%, 1.27 Wh) and the PVA-AER membrane (34.3%, 1.2 Wh). Furthermore, the DBFC using the bilayer membrane achieved a peak power density of 327 mW·cm–2, which was 2.14 times of that of the DBFC using the PVA-AER membrane (153 mW·cm–2). Finally, the drastic improvement benefited from the bilayer design, which introduced an interphase to suppress fuel crossover and avoided unnecessary borohydride hydrolysis.

Research Organization:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); Zhejiang Provincial Natural Science Foundation of China; Natural Science Foundation of Shanghai
Grant/Contract Number:
SC0012704
OSTI ID:
1661645
Report Number(s):
BNL--219835-2020-JAAM
Journal Information:
ACS Applied Materials and Interfaces, Journal Name: ACS Applied Materials and Interfaces Journal Issue: 24 Vol. 12; ISSN 1944-8244
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English

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