A chemically regenerative redox fuel cell using (2,2,6,6-tetramethylpiperidin-1-yl)oxyl redox reaction in acid medium
- Authors
- Han, S.-B.; Kwak, D.-H.; Park, H.S.; Park, J.-Y.; Ma, K.-B.; Won, J.-E.; Kim, D.-H.; Kim, M.-C.; Park, K.-W.
- Issue Date
- Jul-2018
- Publisher
- Elsevier B.V.
- Keywords
- Chemically regenerative redox fuel cell; Cathode; TEMPO; Redox reaction
- Citation
- Journal of Power Sources, v.393, pp.32 - 36
- Journal Title
- Journal of Power Sources
- Volume
- 393
- Start Page
- 32
- End Page
- 36
- URI
- http://scholarworks.bwise.kr/ssu/handle/2018.sw.ssu/31512
- DOI
- 10.1016/j.jpowsour.2018.05.009
- ISSN
- 0378-7753
- Abstract
- (2,2,6,6-tetramethylpiperidin-1-yl)oxyl (TEMPO) with no free radical and non-volatile characteristic can be utilized as a liquid catalyst instead of O2 at the cathode in a chemical regenerative redox fuel cell with H2 as a fuel at the anode. In this study, the electrochemical properties and performance of TEMPO dissolved in sulfuric acid solution are investigated using half and unit cells. In the half-cell, TEMPO shows an activation energy of 1.27 kcal mol−1 K−1 for the reduction. A chemical regenerative redox fuel cell (CRRFC) using TEMPO as the liquid catalyst exhibits an open circuit voltage of 0.7 V and a maximum power density of 90 mW cm−2 at 30 °C with a low activation loss. The regeneration cycling test of the CRRFC is performed at a constant voltage of 0.4 V under a flow rate of the oxygen-bubbled TEMPO solution. The performance of the CRRFC deteriorates, i.e., a power density of zero measured at >200 min. Thus, a highly efficient regeneration system needs to be developed for a high-performance CRRFC using TEMPO used as a liquid-type oxidant. Furthermore, stable liquid oxidants with relatively high standard reduction potentials can be proposed through various organic compounds. © 2018 Elsevier B.V.
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