Understanding mass and charge transports to create anion-ionomer-free high-performance alkaline direct formate fuel cells |
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| Affiliation: | 1. Key Laboratory of Thermo-Fluid Science and Engineering of MOE, School of Energy and Power Engineering, Xi''an Jiaotong University, Xi''an, Shaanxi, 710049, China;2. Xi''an Jiaotong University Shenzhen Research School, Shenzhen, Guangdong, 518057, China;1. Institute of Fuel Cells, School of Mechanical Engineering, Shanghai Jiao Tong University, Dongchuan Rd. 800, Shanghai, China;2. MOE Key Laboratory of Power Machinery and Engineering, Shanghai Jiao Tong University, Dongchuan Rd. 800, Shanghai, China;1. Graduate School of Engineering, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai, Miyagi, 980-8577, Japan;2. Frontier Research Institute for Interdisciplinary Sciences, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai, Miyagi, 980-8577, Japan;3. Institute of Fluid Science, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai, Miyagi, 980-8577, Japan;1. Institute of Fuel Cell, School of Mechanical Engineering, Shanghai Jiao Tong University, Dongchuan Rd. 800, Shanghai, China;2. Institute of Thermal Engineering, School of Mechanical Engineering, Shanghai Jiao Tong University, Dongchuan Rd. 800, Shanghai, China;1. Department of Mechanical Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong SAR, China;2. Key Laboratory of Low-grade Energy Utilization Technologies and Systems (Chongqing University), Ministry of Education, Chongqing, 400030, China;3. Institute of Engineering Thermophysics, Chongqing University, Chongqing, 400030, China;1. Electrochemical Reaction and Technology Laboratory, School of Earth Sciences and Environmental Engineering;2. Ertl Center for Electrochemistry and Catalysis;3. Chemical Energy Storage and Transition Center/RISE, Gwangju Institute of Science and Technology (GIST), Gwangju 500-712, South Korea |
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| Abstract: | 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 °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. |
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| Keywords: | Fuel cell Direct formate fuel cell Formate oxidation reaction Anion exchange membrane Anion ionomer |
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