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Kang, Yao, Wang, Shuo, Liu, Yanyu, Hui, Kwan San 
ORCID: https://orcid.org/0000-0001-7089-7587, Li, Haifeng, Ng, Kar Wei, Liang, Feng, Geng, Jianxin, Hong, Xiaoting, Zhou, Wei and Hui, Kwun Nam
(2020)
Unveiling the origin of catalytic sites of Pt nanoparticles decorated on oxygen-deficient vanadium-doped cobalt hydroxide nanosheet for hybrid sodium-air batteries.
ACS Applied Energy Materials, 3 (8).
pp. 7464-7473.
ISSN 2574-0962
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Abstract
Highly active bifunctional electrocatalysts are crucial for improving the performance of rechargeable metal-air batteries. However, most reported bifunctional electrocatalysts feature poor electrocatalytic activity and stability toward oxygen reduction reaction (ORR) and oxygen evolution reaction (OER). Here, we have reported the first-ever study of an effective one-step reduction-assisted exfoliation method to exfoliate bulk vanadium-doped cobalt hydroxide (V-doped Co(OH)2, denoted as V-Co(OH)2) into ultrathin nanosheets with abundant oxygen vacancies (V-Co(OH)2-Ov) and simultaneously anchor them with highly dispersed ultrafine Pt nanoparticles (NPs) with a nominal size of 0.8-2.4 nm (denoted as Pt/V-Co(OH)2-Ov). The Pt/V-Co(OH)2-Ov catalyst exhibits improved catalytic performance in ORR/OER. X-ray absorption spectroscopy analysis and theoretical calculations reveal the strong interfacial electronic interactions between Pt NPs and V-Co(OH)2-Ov, which synergistically improves oxygen intermediates' adsorption/desorption, enhancing the ORR and OER performance. Using Pt/V-Co(OH)2-Ov as a catalyst in the air cathode, a hybrid sodium-air battery displays a record value of an ultralow charging-discharging voltage gap of 0.07 V at a current density of 0.01 mA cm-2 with remarkable stability of up to 1000 cycles. This reduction-assisted exfoliation approach provides a new strategy to generate oxygen vacancies in metal hydroxides, which act as anchoring sites for deposition of sub-nanometal NPs via a strong interfacial effect.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | dft calculation,electrocatalysis,electronic structure reformation,hybrid sodium-air battery,pt nanoparticles,vanadium-doped cobalt hydroxide,chemical engineering (miscellaneous),energy engineering and power technology,electrochemistry,materials chemistry,electrical and electronic engineering ,/dk/atira/pure/subjectarea/asjc/1500/1501 |
| Faculty \ School: | Faculty of Science > School of Engineering (former - to 2024) |
| UEA Research Groups: | Faculty of Science > Research Groups > Energy Materials Laboratory Faculty of Science > Research Groups > Emerging Technologies for Electric Vehicles (EV) |
| Related URLs: | |
| Depositing User: | LivePure Connector |
| Date Deposited: | 21 Oct 2020 23:55 |
| Last Modified: | 25 Sep 2024 15:04 |
| URI: | https://ueaeprints.uea.ac.uk/id/eprint/77394 |
| DOI: | 10.1021/acsaem.0c00872 |
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