Effect of thermal decomposition products of coal on anodic reactions in direct carbon fuel cells |
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Authors: | Younghoon Rhie Seongyong Eom Seongyool Ahn Gyungmin Choi Duckjool Kim |
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Affiliation: | 1. Graduate School of Mechanical Engineering, Pusan National University, Busan, 609-735, Korea 2. CRIEPI, 2-6-1 Nagasaka, Yokosuka-shi, Kanagawa-ken, 240-0196, Japan 3. School of Mechanical Engineering, Pusan National University, Busan, 609-735, Korea
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Abstract: | The effect of inherent volatile matter in fuels on anodic electrochemical reactions was investigated in a direct carbon fuel cell (DCFC). Through thermal decomposition, raw coals, which are used as power source in the DCFC system, release gases under an operating temperature of 700°C. These exhaust gases change the gas composition around the anode and affect the system’s electrochemical reaction. To investigate the effect of produced gases, a comparative study was conducted between Indonesian sub-bituminous coal and char obtained through thermal treatment. The open circuit voltage of raw coal increased to 0.23 V compared with that of char. The maximum power density of raw coal (52 mW/cm2) was also higher than that of char (37 mW/cm2) because of the enhanced electron transport caused by the additional reaction of hydrogen, methane, and carbon monoxide. The influence of volatile matter on the anodic electrolyte-electrode interface was analyzed with the use of the equivalent circuit induced from fitting the impedance data. |
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