We found a match
Your institution may have rights to this item. Sign in to continue.
- Title
Molten NaCl-Assisted Synthesis of Porous Fe-N-C Electrocatalysts with a High Density of Catalytically Accessible FeN<sub>4</sub> Active Sites and Outstanding Oxygen Reduction Reaction Performance.
- Authors
Qing Wang; Yuqi Yang; Fanfei Sun; Guangbo Chen; Jian Wang; Lishan Peng; Wan-Ting Chen; Lu Shang; Jiaqi Zhao; Sun-Waterhouse, Dongxiao; Tierui Zhang; Waterhouse, Geoffrey I. N.
- Abstract
Iron single atom catalysts (FeN4) hosted in the micropores of N-doped carbons offer excellent performance for the oxygen reduction reaction (ORR). Achieving a high density of FeN4 sites accessible for ORR has proved challenging to date. Herein, a simple surface NaCl-assisted method towards microporous N-doped carbon electrocatalysts with an abundance of catalytically accessible FeN4 sites is reported. Powder mixtures of microporous zeolitic imidazolate framework-8 and NaCl are first heated to 1000 °C in N2, with the melting of NaCl above 800 °C creating a highly porous N-doped carbon product (NC-NaCl). Ferric (Fe3+) ions are then adsorbed onto NC-NaCl, with a second pyrolysis stage at 900 °C in N2 yielding a porous Fe/NC-NaCl electrocatalyst (Brunauer--Emmett--Teller surface area, 1911 m² g-1) with an excellent dispersion and high density of accessible surface FeN4 sites (26.3 x 1019 sites g-1). The Fe/NC-NaCl electrocatalyst exhibits outstanding ORR performance with a high half-wave potential of 0.832 V (vs reversible hydrogen electrode) in 0.1 M HClO4. When used as the ORR cathode catalyst in a 1.0 bar H2-O2 fuel cell, Fe/NC-NaCl offers a high peak power density of 0.89 W cm-2, ranking it as one of the most active M-N-C materials reported to date.
- Subjects
OXYGEN reduction; FUSED salts; PROTON exchange membrane fuel cells; ELECTROCATALYSTS; STANDARD hydrogen electrode; FUEL cells
- Publication
Advanced Energy Materials, 2021, Vol 11, Issue 19, p1
- ISSN
1614-6832
- Publication type
Article
- DOI
10.1002/aenm.202100219