Interaction of graphene,MnOx, and Ca2+ for enhanced biomimetic, ‘bubble-free’ oxygen evolution reaction at mild pH |
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| Affiliation: | 1. Research School of Electrical, Energy and Materials Engineering, The Australian National University, Acton, ACT, 2601, Australia;2. Intelligent Polymer Research Institute and Australian Research Council Centre of Excellence for Electromaterials Science, University of Wollongong, Wollongong, NSW, 2522, Australia;3. Research School of Chemistry, The Australian National University, Acton, ACT, 2601, Australia;4. Australian Nuclear Science and Technology Organisation, Lucas Heights, NSW, 2234, Australia;5. Institute for Superconducting and Electronic Materials, Australian Institute of Innovative Materials, University of Wollongong, Wollongong, NSW, 2522, Australia |
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| Abstract: | Water electrolysis powered by renewable electricity will likely be critical to a future hydrogen economy. However, the typical use of strongly acidic or alkaline electrolytes necessitates the use of expensive materials, while bubbles add to capital and operational costs, due to blocking of the electrode surface and the necessary use of pumps and gas-liquid separators. Here ‘bubble-free’ oxygen evolution at mild pH is carried out using an electrocatalyst that mimics photosystem II (PSII). The bubble-free electrode includes a gas-extracting Gore-Tex® membrane. Edge-functionalised graphene (EFG) is included to mimic the metal-binding local protein environment, and the tyrosine residue, in the oxygen evolving complex (OEC) of PSII, while MnOx and Ca2+ are incorporated to mimic the Mn4CaO5 cluster. Interaction between EFG, MnOx, and Ca2+ results in a significant, 130 mV fall in the overpotential required to drive electrocatalytic oxygen evolution at 10 mA cm−2, compared to the electrode without these biomimetic components. |
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| Keywords: | Electrochemical water splitting Oxygen evolution reaction Biomimetic Bubble-free Edge-functionalised graphene Photosystem II |
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