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Instruments / Technical Area	Publication Details	Published	Actions
B18-Core EXAFS E01-JEM ARM 200CF E02-JEM ARM 300CF	Identification and manipulation of dynamic active site deficiency-induced competing reactions in electrocatalytic oxidation processes Runjia Lin , Liqun Kang , Tianqi Zhao , Jianrui Feng , Veronica Celorrio , Guohui Zhang , Giannantonio Cibin , Anthony Kucernak , Dan Brett , Furio Cora , Ivan P. Parkin , Guanjie He Energy & Environmental Science DOI: 10.1039/D1EE03522C Diamond Proposal Number(s): [25410, 29207] Open Access Show Abstract ▼ Abstract: Electrocatalytic organic compound oxidation reactions (OCORs) have been intensively studied for energy and environmentally benign applications. However, relatively little effort has been devoted to developing a fundamental understanding of OCOR, including the detailed competition with side reactions and activity limitations, thus inhibiting the rational design of high-performance electrocatalysts. Herein, by taking NiWO4-catalysed urea oxidation reaction (UOR) in aqueous media as an example, the competition between the OCOR and the oxygen evolution reaction (OER) within a wide potential range is examined. It is shown that the root of the competition can be ascribed to insufficient surface concentration of dynamic Ni3+, an active site shared by both UOR and OER. Similar phenomenon are observed in other OCOR electrocatalysts and systems. To address the issue, a “controllable reconstruction of pseudo-crystalline bimetal oxides” design strategy is proposed to maximise the dynamic Ni3+ population and manipulate the competition between UOR and OER. The optimised electrocatalyst delivers best-in-class performance and a ~10-fold increase in current density at 1.6 V versus the reversible hydrogen electrode for alkaline urea electrolysis compared to that of the pristine materials.	Mar 2022

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B18-Core EXAFS
E01-JEM ARM 200CF
E02-JEM ARM 300CF

Identification and manipulation of dynamic active site deficiency-induced competing reactions in electrocatalytic oxidation processes