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Instruments / Technical Area	Publication Details	Published	Actions
I15-1-X-ray Pair Distribution Function (XPDF)	Understanding the electrochemical behaviour of reduced graphene oxide cathodes in all-carbon Na-ion batteries Marcin W. Orzech , Francesco Mazzali , Arturas Adomkevicius , Mauro Coduri , Yubiao Niu , James D. Mcgettrick , Philip A. Chater , Laura Cabo-Fernandez , Laurence J. Hardwick , Lorenzo Malavasi , Serena Margadonna Materials Advances DOI: 10.1039/D4MA00605D Diamond Proposal Number(s): [19325] Open Access Show Abstract ▼ Abstract: Sodium-ion batteries represent a sustainable and cost-effective solution for grid-scale energy storage. However, the reliance on cathode materials containing scarce transition metals currently limits their wider adoption. Carbonaceous materials present an environmentally sustainable and economically viable alternative. This study investigates application of reduced graphene oxide as a cathode active material. Detailed analysis of the storage mechanism and its dependency on the morphological and chemical structure, revealed that the key factors responsible for high capacity and long cycle life are the open structure of graphene sheets and the presence of functional oxygen and nitrogen groups. Good understanding of the mechanism allowed optimisation of cycling conditions in a proof-of-concept all-carbon full cell incorporating reduced graphene oxide and hard carbon as cathode and anode, respectively. The system displays good energy density (80 Wh kg-1) and remarkable stability over 500 cycles. The gained insights will support rational design of more efficient carbonaceous electrodes.	Sep 2024
I11-High Resolution Powder Diffraction	High-pressure high-temperature tailoring of High Entropy Alloys for extreme environments Kirill V. Yusenko , Sephira Riva , Wilson A. Crichton , Kristina Spektor , Elena Bykova , Anna Pakhomova , Adam Tudball , Ilya Kupenko , Arno Rohrbach , Stephan Klemme , Francesco Mazzali , Serena Margadonna , Nicholas P. Lavery , Stephen G. R. Brown Journal Of Alloys And Compounds 738, 491 - 500 DOI: 10.1016/j.jallcom.2017.12.216 Diamond Proposal Number(s): [13987] Show Abstract ▼ Abstract: The exceptional performance of some High Entropy Alloys (HEAs) under extreme conditions holds out the possibility of new and exciting materials for engineers to exploit in future applications. In this work, instead of focusing solely on the effects of high temperature on HEAs, the effects of combined high temperature and high pressure were observed. Phase transformations occurring in a pristine HEA, the as-cast bcc–Al2CoCrFeNi, are heavily influenced by temperature, pressure, and by scandium additions. As-cast bcc–Al2CoCrFeNi and fcc–Al0.3CoCrFeNi HEAs are structurally stable below 60 GPa and do not undergo phase transitions. Addition of scandium to bcc–Al2CoCrFeNi results in the precipitation of hexagonal AlScM intermetallic (W-phase), which dissolves in the matrix after high-pressure high-temperature treatment. Addition of scandium and high-pressure sintering improve hardness and thermal stability of well-investigated fcc- and bcc- HEAs. The dissolution of the intermetallic in the main phase at high pressure suggests a new strategy in the design and optimization of HEAs.	Mar 2018

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