Bi-modified Pt supported on carbon black as electro-oxidation catalyst for 300 W formic acid fuel cell stack

조회수 : 651 등록일 : 2019.07.01 00:00

Choi, M (Choi, Mihwa); Shin, W (Shin, Woonsup) 2019.09.15

Bi-modified Pt supported on carbon black as electro-oxidation catalyst for 300 W formic acid fuel cell stack

Choi, M (Choi, Mihwa)1,2 ] Ahn, CY (Ahn, Chi-Yeong)3,4 ] Lee, H (Lee, Hyunjoon)3,4 ] Kim, JK (Kim, Jong Kwan)5 ] Oh, SH (Oh, Seung-Hyeon)5 ] Hwang, W (Hwang, Wonchan)3,4 ] Yang, S (Yang, Seugran)1 ] Kim, J (Kim, Jungsuk)1,2 ] Kim, OH (Kim, Ok-Hee)6 ] Choi, I (Choi, Insoo)7 ] Sung, YE(Sung, Yung-Eun)3,4 ] Cho, YH (Cho, Yong-Hun)5 ] Rhee, CK (Rhee, Choong Kyun)8 ] Shin, W (Shin, Woonsup)2 ]

[ 1 ] Korea Elect Power Corp KEPCO Res Inst, New & Renewable Energy Lab, Daejeon 34056, South Korea
[ 2 ] Sogang Univ, Dept Chem, Seoul 04107, South Korea
[ 3 ] Inst for Basic Sci Korea, Ctr Nanoparticle Res, Seoul 08826, South Korea
[ 4 ] Seoul Natl Univ, Sch Chem & Biol Engn, Seoul 08826, South Korea
[ 5 ] Kangwon Natl Univ, Dept Chem Engn, Samcheok 25913, South Korea
[ 6 ] Republ Korea Naval Acad, Dept Sci, Chang Won 51704, South Korea
[ 7 ] Kangwon Natl Univ, Div Energy Engn, Samcheok 25913, South Korea
[ 8 ] Chungnam Natl Univ, Dept Chem, Daejeon 34134, South Korea

Formic acid is a chemical with a simple molecular structure containing hydrogen. This liquid at room temperature is easy to handle and has a low toxicity, and is thus in the spotlight as a fuel. In particular, formic acid is an excellent fuel candidate because it can be operated at low temperatures when applied as a fuel in fuel cells with a high theoretical open-circuit voltage (1.48 V). However, it has a drawback in that the electrode catalyst is deactivated due to the generation of CO intermediates when formic acid is oxidized during cell operation. Therefore, to prevent this, an irreversibly adsorbed Bi on Pt catalyst is applied to a direct formic acid fuel cell (DFAFC) anode because it is easy to synthesize and economical. Physical analyses such as transmission electron microscopy (TEM), X-ray diffraction (XRD), and thermogravimetric analysis (TGA) were conducted, and electrochemical evaluations were performed through half-cell and single-cell level tests. The results revealed that the formic acid oxidation reaction activity of the Bi-modified Pt/C was 13 times higher than that of the conventional catalyst at 0.58 V. Further, a DFAFC stack was fabricated using the Bi-modified Pt/C, which yielded a power of 300 W. These results suggest that a simple synthesis method can be applied to fabricating industrially available DFAFC stacks.

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