High-Performance Chemically Regenerative Redox Fuel Cells Using a NO3-/NO Regeneration Reaction.
In this study, we proposed high-performance chemically regenerative redox fuel cells (CRRFCs) using NO3-/NO with a nitrogen-doped carbon-felt electrode and a chemical regeneration reaction of NO to NO3-via O2. The electrochemical cell using the nitrate reduction to NO at the cathode on the carbon felt and oxidation of H2as a fuel at the anode showed a maximal power density of 730 mW cm-2at 80 °C and twofold higher power density of 512 mW cm-2at 0.8 V, than the target power density of 250 mW cm-2at 0.8 V in the H2/O2proton exchange membrane fuel cells (PEMFCs). During the operation of the CRRFCs with the chemical regeneration reactor for 30 days, the CRRFCs maintained 60 % of the initial performance with a regeneration efficiency of about 92.9 % and immediately returned to the initial value when supplied with fresh HNO3.
Department of Chemical Engineering, Soongsil University, 369 Sangdo-ro, Dongjak-gu, Seoul, 06978, Republic of Korea.
Sang-Beom
SB
Han
Department of Chemical Engineering, Soongsil University, 369 Sangdo-ro, Dongjak-gu, Seoul, 06978, Republic of Korea.
Da-Hee
DH
Kwak
Department of Chemical Engineering, Soongsil University, 369 Sangdo-ro, Dongjak-gu, Seoul, 06978, Republic of Korea.
Hyun Suk
HS
Park
Department of Chemical Engineering, Soongsil University, 369 Sangdo-ro, Dongjak-gu, Seoul, 06978, Republic of Korea.
In-Ae
IA
Choi
Department of Chemical Engineering, Soongsil University, 369 Sangdo-ro, Dongjak-gu, Seoul, 06978, Republic of Korea.
Jin-Young
JY
Park
Department of Chemical Engineering, Soongsil University, 369 Sangdo-ro, Dongjak-gu, Seoul, 06978, Republic of Korea.
Si-Jin
SJ
Kim
Department of Chemical Engineering, Soongsil University, 369 Sangdo-ro, Dongjak-gu, Seoul, 06978, Republic of Korea.
Min-Cheol
MC
Kim
Department of Chemical Engineering, Soongsil University, 369 Sangdo-ro, Dongjak-gu, Seoul, 06978, Republic of Korea.
Seongho
S
Hong
Department of Chemical Engineering, Soongsil University, 369 Sangdo-ro, Dongjak-gu, Seoul, 06978, Republic of Korea.
Kyung-Won
KW
Park
carbon felt; fuel cells; nitrate; polymer electrolyte; redox couples