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Vacancy-assisted oxygen reduction reaction on cobalt-based catalysts in direct borohydride fuel cell revealed by in-situ XAFS and XRD
Wang, J; Lin, LX; He, Y; Qin, HY; Yan, S; Yang, K; Li, AG; Liu, JB
2017
Source PublicationELECTROCHIMICA ACTA
ISSN0013-4686
Volume254Issue:-Pages:72-78
Subtype期刊论文
AbstractThe oxygen reduction reaction mechanism is the key issue for designing novel non-Pt electrocatalysts of H-2-O-2 fuel cells. Although the Men+/Me(n+1)+ redox model has been widely accepted, the valence state of the Men+ was found to keep unchanged in this work. Polypyrrole-modified carbon-supported cobalt oxyhydroxide catalyst (CoOOH-PPy-BP) was prepared by impregnation-chemical method and used as cathode catalyst in direct borohydride fuel cells. The CoOOH-PPy-BP exhibited compatible electrochemical properties with Co(OH)(2)-PPy-BP and a near 4e transfer oxygen reduction reaction. The variation of the local structure around Co ions during discharging was analyzed by in-situ X-ray absorption fine structure (XAFS) and X-ray diffraction (XRD) measurements. No new phase was detected by in-situ XRD while oxygen vacancies were detected by in-situ XAFS. Oxygen vacancies at the surface of CoOOH provided favorable sites for the O-2 absorption, accelerating the activation of the O-2. The electron holes generated due to the oxygen vacancies in the CoOOH can capture electrons from the anode to form excited cationic states [Co3++ e]. Then the absorption oxygen molecule is reduced by capturing electrons from [Co3++ e]. A new oxygen reduction reaction mechanism based on the oxygen vacancy instead of the previous Con+/Co(n+1)+ model is proposed. This work provides lights for the design of novel catalysts with excellent performance by introducing defects of oxygen vacancies artificially. (C) 2017 Elsevier Ltd. All rights reserved.
KeywordElectrocatalytic Activity Mno2-catalyzed Cathode Alkaline Media Active-sites Carbon Hydroxide Performance Electrolyte Storage Anode
DOI10.1016/j.electacta.2017.09.102
WOS KeywordELECTROCATALYTIC ACTIVITY ; MNO2-CATALYZED CATHODE ; ALKALINE MEDIA ; ACTIVE-SITES ; CARBON ; HYDROXIDE ; PERFORMANCE ; ELECTROLYTE ; STORAGE ; ANODE
Indexed BySCI
Language英语
WOS IDWOS:000413239600008
Citation statistics
Cited Times:4[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.sinap.ac.cn/handle/331007/28894
Collection中科院上海应用物理研究所2011-2018年
Recommended Citation
GB/T 7714
Wang, J,Lin, LX,He, Y,et al. Vacancy-assisted oxygen reduction reaction on cobalt-based catalysts in direct borohydride fuel cell revealed by in-situ XAFS and XRD[J]. ELECTROCHIMICA ACTA,2017,254(-):72-78.
APA Wang, J.,Lin, LX.,He, Y.,Qin, HY.,Yan, S.,...&Liu, JB.(2017).Vacancy-assisted oxygen reduction reaction on cobalt-based catalysts in direct borohydride fuel cell revealed by in-situ XAFS and XRD.ELECTROCHIMICA ACTA,254(-),72-78.
MLA Wang, J,et al."Vacancy-assisted oxygen reduction reaction on cobalt-based catalysts in direct borohydride fuel cell revealed by in-situ XAFS and XRD".ELECTROCHIMICA ACTA 254.-(2017):72-78.
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