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Iron, nitrogen co-doped carbon spheres as low cost, scalable electrocatalysts for the oxygen reduction reaction

DOI: 10.1002/adfm.202102974 DOI Help

Authors: Jingyu Feng (Imperial College London) , Rongsheng Cai (University of Manchester) , Emanuele Magliocca (University College London) , Hui Luo (Imperial College London) , Luke Higgins (University of Leeds) , Giulio L. Fumagalli Romario (Imperial College London) , Xiaoqiang Liang (Imperial College London; Xi'an Polytechnic University) , Angus Pedersen (Imperial College London) , Zhen Xu (Imperial College London) , Zhenyu Guo (Imperial College London) , Arun Periasamy (University of Surrey) , Dan Brett (University College London) , Thomas S. Miller (University College London) , Sarah J. Haigh (University of Manchester) , Bhoopesh Mishra (University of Leeds) , Maria-Magdalena Titirici (Queen Mary University of London)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Advanced Functional Materials , VOL 324

State: Published (Approved)
Published: August 2021
Diamond Proposal Number(s): 26201 , 27900

Open Access Open Access

Abstract: Atomically dispersed transition metal-nitrogen-carbon catalysts are emerging as low-cost electrocatalysts for the oxygen reduction reaction in fuel cells. However, a cost-effective and scalable synthesis strategy for these catalysts is still required, as well as a greater understanding of their mechanisms. Herein, iron, nitrogen co-doped carbon spheres (Fe@NCS) have been prepared via hydrothermal carbonization and high-temperature post carbonization. It is determined that FeN4 is the main form of iron existing in the obtained Fe@NCS. Two different precursors containing Fe2+ and Fe3+ are compared. Both chemical and structural differences have been observed in catalysts starting from Fe2+ and Fe3+ precursors. Fe2+@NCS-A (starting with Fe2+ precursor) shows better catalytic activity for the oxygen reduction reaction. This catalyst is studied in an anion exchange membrane fuel cell. The high open-circuit voltage demonstrates the potential approach for developing high-performance, low-cost fuel cell catalysts.

Journal Keywords: anion exchange membrane fuel cells,; electrocatalysts; non-PGM catalysts; oxygen reduction reaction; xylose

Diamond Keywords: Fuel Cells

Subject Areas: Chemistry, Materials, Energy

Instruments: B18-Core EXAFS , I22-Small angle scattering & Diffraction

Added On: 17/08/2021 13:13

Discipline Tags:

Catalysis Physical Chemistry Earth Sciences & Environment Climate Change Energy Energy Storage Sustainable Energy Systems Materials Science Energy Materials Chemistry

Technical Tags:

Scattering Spectroscopy Small Angle X-ray Scattering (SAXS) Wide Angle X-ray Scattering (WAXS) X-ray Absorption Spectroscopy (XAS)