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Instruments / Technical Area	Publication Details	Published	Actions
B18-Core EXAFS I22-Small angle scattering & Diffraction	Iron, nitrogen Co-doped carbon spheres as low cost, scalable electrocatalysts for the oxygen reduction reaction Jingyu Feng , Rongsheng Cai , Emanuele Magliocca , Hui Luo , Luke Higgins , Giulio L. Fumagalli Romario , Xiaoqiang Liang , Angus Pedersen , Zhen Xu , Zhenyu Guo , Arun Periasamy , Dan Brett , Thomas S. Miller , Sarah J. Haigh , Bhoopesh Mishra , Maria-Magdalena Titirici Advanced Functional Materials 324 DOI: 10.1002/adfm.202102974 Diamond Proposal Number(s): [26201, 27900] Open Access Show Abstract ▼ 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.	Aug 2021
I20-EDE-Energy Dispersive EXAFS (EDE)	A novel fuel cell design for operando energy-dispersive X-ray absorption measurements Andrew S. Leach , Jennifer Hack , Monica Amboage , Sofia Diaz-Moreno , Haoliang Huang , Patrick L. Cullen , Martin Wilding , Emanuele Magliocca , Thomas Miller , Christopher Howard , Daniel Brett , Paul Shearing , Paul F. Mcmillan , Andrea E. Russell , Rhodri Jervis Journal Of Physics: Condensed Matter DOI: 10.1088/1361-648X/ac0476 Diamond Proposal Number(s): [22008, 15650] Open Access Show Abstract ▼ Abstract: A polymer electrolyte fuel cell (PEFC) has been designed to allow operando X-ray absorption spectroscopy (XAS) measurements of catalysts. The cell has been developed to operate under standard fuel cell conditions, with elevated temperatures and humidification of the gas-phase reactants, both of which greatly impact the catalyst utilisation. X-ray windows in the endplates of the cell facilitate collection of XAS spectra during fuel cell operation while maintaining good compression in the area of measurement. Results of polarisation curves and cyclic voltammograms (CVs) showed that the operando cell performs well as a fuel cell, while also providing XAS data of suitable quality for robust XANES analysis. The cell has produced comparable XAS results when performing a cyclic voltammogram to an established in situ cell when measuring the Pt LIII edge. Similar trends of Pt oxidation, and reduction of the formed Pt oxide, have been presented with a time resolution of 5 seconds for each spectrum, paving the way for time-resolved spectral measurements of fuel cell catalysts in a fully-operating fuel cell.	May 2021

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