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[Fe(CN)6] vacancy-boosting oxygen evolution activity of Co-based Prussian blue analogues for hybrid sodium-air battery
Kang, Y.1; Wang, S.1; Hui, K. S.2; Li, H. F.1; Liang, F.3; Wu, X. L.4; Zhang, Q.5; Zhou, W.6; Chen, L.5; Chen, F.7; Hui, K. N.1
2021-06-01
Source PublicationMaterials Today Energy
Volume20
AbstractPrussian blue analogues (PBAs) have emerged as efficient catalysts for oxygen evolution reaction (OER) due to their porous structure with well-dispersed active sites. However, Co-based PBA (Co-PBA) electrocatalysts are characterized by moderate OER kinetics. In this study, we developed a facile high-yield strategy to fabricate defective Co-PBA (D-Co-PBA) with [Fe(CN)] vacancies and exposed Co (III) active sites by post-oxidation treatment of the pristine Co-PBA with aqueous HO. Rietveld refinement results show that the lattice parameter (a) and unit-cell volume (V) of D-Co-PBA are smaller than those of the pristine Co-PBA, thereby confirming the generation of [Fe(CN)] vacancies. Density functional theory calculations reveal that the [Fe(CN)] vacancy can effectively regulate the electronic structure of D-Co-PBA; this condition reduces the reaction barrier of the rate-determining step toward OER. In OER, the D-Co-PBA catalyst achieves a lower overpotential of 400 mV at a current density of 10 mA cm, which is superior to that of Ir/C (430 mV) and Co-PBA (450 mV). A hybrid sodium–air battery assembled with Pt/C and D-Co-PBA catalysts displays a discharge voltage of 2.75 V, an ultralow charging–discharging gap of 0.15 V, and a round-trip efficiency of 94.83% on the 1000th cycle at the current density of 0.01 mA cm. This study is highly promising for large-scale production of affordable and effective PBA-based materials with desirable OER activity for metal-air batteries and water-alkali electrolyzers, thus helping achieve the goal of sustainability.
KeywordAqueous sodium-air battery Oxygen evolution reaction Surface electronic configuration [Fe(CN)6] vacancies
DOI10.1016/j.mtener.2020.100572
URLView the original
Language英語English
Scopus ID2-s2.0-85098197395
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Cited Times [WOS]:2   [WOS Record]     [Related Records in WOS]
Document TypeJournal article
CollectionINSTITUTE OF APPLIED PHYSICS AND MATERIALS ENGINEERING
Corresponding AuthorHui, K. S.
Affiliation1.Joint Key Laboratory of the Ministry of Education, Institute of Applied Physics and Materials Engineering, University of Macau, Avenida da Universidade, Taipa, 999078, Macao
2.Engineering, Faculty of Science, University of East Anglia, Norwich, NR4 7TJ, United Kingdom
3.State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization, Kunming University of Science and Technology, Kunming, 650093, China
4.College of Geography and Environmental Science, Zhejiang Normal University, Jinhua, 321004, China
5.Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo, 315201, China
6.Department of Mechanical & Electrical Engineering, Xiamen University, Xiamen, 361005, China
7.Guangdong Provincial Key Laboratory of Quantum Engineering and Quantum Materials, School of Physics and Telecommunication Engineering, South China Normal University, Guangzhou, 510006, China
First Author AffilicationINSTITUTE OF APPLIED PHYSICS AND MATERIALS ENGINEERING
Recommended Citation
GB/T 7714
Kang, Y.,Wang, S.,Hui, K. S.,et al. [Fe(CN)6] vacancy-boosting oxygen evolution activity of Co-based Prussian blue analogues for hybrid sodium-air battery[J]. Materials Today Energy,2021,20.
APA Kang, Y.,Wang, S.,Hui, K. S.,Li, H. F.,Liang, F.,Wu, X. L.,Zhang, Q.,Zhou, W.,Chen, L.,Chen, F.,&Hui, K. N..(2021).[Fe(CN)6] vacancy-boosting oxygen evolution activity of Co-based Prussian blue analogues for hybrid sodium-air battery.Materials Today Energy,20.
MLA Kang, Y.,et al."[Fe(CN)6] vacancy-boosting oxygen evolution activity of Co-based Prussian blue analogues for hybrid sodium-air battery".Materials Today Energy 20(2021).
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