A chemically regenerative redox fuel cell using (2,2,6,6-tetramethylpiperidin-1-yl)oxyl redox reaction in acid medium

作者：Han Sang Beom; Kwak Da Hee; Park Hyun Suk; Park Jin Young; Ma Kyeng Bae; Won Ji Eun; Kim Do Hyoung; Kim Min Cheol; Park Kyung Won^*

来源：Journal of Power Sources, 2018, 393: 32-36.

DOI：10.1016/j.jpowsour.2018.05.009

• Chemically regenerative redox fuel cell
• Cathode
• TEMPO
• Redox reaction

(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 O-2 at the cathode in a chemical regenerative redox fuel cell with H-2 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 degrees 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.

• 出版日期2018-7-31