Co3+-Rich Na1.95CoP2O7 Phosphates as Efficient Bifunctional Catalysts for Oxygen Evolution and Reduction Reactions in Alkaline Solution |
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Authors: | Dr Liangqi Gui Xiaoyun Miao Chengjun Lei Kailin Wang Dr Wei Zhou Dr Beibei He Prof Qing Wang Dr Ling Zhao |
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Institution: | 1. Faculty of Materials Science and Chemistry, China University of Geosciences, Wuhan, 430074 China;2. Faculty of Materials Science and Chemistry, China University of Geosciences, Wuhan, 430074 China
Zhejiang Institute, China University of Geosciences (Wuhan), Hangzhou, 311305 China
Engineering Research Center of Nano-Geo Materials, of Ministry of Education, China University of Geosciences, Wuhan, 430074 China |
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Abstract: | Implementing sustainable energy conversion and storage technologies is highly reliant on crucial oxygen electrocatalysis, such as the oxygen evolution reaction (OER) and oxygen reduction reaction (ORR). However, the pursuit of low cost, energetic efficient and robust bifunctional catalysts for OER and ORR remains a great challenge. Herein, the novel Na-ion-deficient Na2−xCoP2O7 catalysts are proposed to efficiently electrocatalyze OER and ORR in alkaline solution. The engineering of Na-ion deficiency can tune the electronic structure of Co, and thus tailor the intrinsically electrocatalytic performance. Among the sodium cobalt phosphate catalysts, the Na1.95CoP2O7 (NCPO5) catalyst exhibits the lowest ΔE (EJ10,OER−EJ−1,ORR) of only 0.86 V, which favorably outperforms most of the reported non-noble metal catalysts. Moreover, the Na-ion deficiency can stabilize the phase structure and morphology of NCPO5 during the OER and ORR processes. This study highlights the Na-ion deficient Na2−xCoP2O7 as a promising class of low-cost, highly active and robust bifunctional catalysts for OER and ORR. |
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Keywords: | bifunctional catalysts defect engineering highly efficient sodium cobalt phosphate |
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