Journal
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
Volume 44, Issue 14, Pages 7538-7543Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijhydene.2019.01.240
Keywords
Fuel cell; Direct formate fuel cell; Formate oxidation reaction; Anion exchange membrane; Anion ionomer
Categories
Funding
- National Natural Science Foundation of China [51776156]
- Shenzhen Science and Technology Foundation [JCYJ20170816100910119]
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The disadvantage of anion ionomer that possesses low hydroxide conductivity, and thermal and chemical instability hinders the development of the high-performance anion-exchange membrane direct liquid fuel cells. Instead of adding additional base and synthesizing high-conductivity ionomer material, by gaining insight into species transports, herein, we propose an anion-ionomer-free anion-exchange membrane direct formate fuel cell (AEM DFFC). Experimental result reveals that this conceptual anion-ionomer-free AEM DFFC can operate stably within a 6-h constant-current discharge at 10 mA cm(-2), mainly because formate hydrolysis renders a high OH- conductivity. It was also found that the anion-ionomer-free AEM DFFC yields a peak power density as high as 41 mW cm(-2) at 40 degrees C, 40% higher than that of the conventional quaternary ammonia polysulfone anion-ionomer AEM DFFC. This can be attributed to the fact that the OH -containing formate solution facilitates the mass and charge transports, thereby enlarging the triple-phase boundary for both anodic formate oxidation reaction and cathodic oxygen reduction reaction. (C) 2019 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
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