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High‐Performance Chemically Regenerative Redox Fuel Cells Using a NO 3 − /NO Regeneration Reaction
Author(s) -
Han SangBeom,
Kwak DaHee,
Park Hyun Suk,
Choi InAe,
Park JinYoung,
Kim SiJin,
Kim MinCheol,
Hong Seongho,
Park KyungWon
Publication year - 2017
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.201610738
Subject(s) - anode , proton exchange membrane fuel cell , redox , electrochemistry , power density , cathode , regeneration (biology) , electrode , carbon fibers , chemistry , chemical engineering , materials science , analytical chemistry (journal) , inorganic chemistry , fuel cells , environmental chemistry , power (physics) , composite material , physics , quantum mechanics , composite number , engineering , biology , microbiology and biotechnology
In this study, we proposed high‐performance chemically regenerative redox fuel cells (CRRFCs) using NO 3 − /NO with a nitrogen‐doped carbon‐felt electrode and a chemical regeneration reaction of NO to NO 3 − via O 2 . The electrochemical cell using the nitrate reduction to NO at the cathode on the carbon felt and oxidation of H 2 as a fuel at the anode showed a maximal power density of 730 mW cm −2 at 80 °C and twofold higher power density of 512 mW cm −2 at 0.8 V, than the target power density of 250 mW cm −2 at 0.8 V in the H 2 /O 2 proton 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 HNO 3 .