An operando-raman study on oxygen evolution of manganese oxides: roles of phase composition and amorphization
文献类型：期刊论文
| 作者 | An, Hongyu1,2; Chen, Zheng1,2; Yang, Jingxiu1; Feng, Zhaochi1; Wang, Xiuli1; Fan, Fengtao1; Li, Can1 |
| 刊名 | Journal of catalysis
 |
| 出版日期 | 2018-11-01 |
| 卷号 | 367页码:53-61 |
| ISSN号 | 0021-9517 |
| 关键词 | Electrocatalysis Water oxidation In-situ spectroscopy Birnessite Bixbyite |
| DOI | 10.1016/j.jcat.2018.08.007 |
| 通讯作者 | Fan, fengtao(ftfan@dicp.ac.cn) ; Li, can(canli@dicp.ac.cn) |
| 英文摘要 | Manganese oxide catalysts exist in various forms of polymorphs, which have direct influence on their oxygen evolution reaction (oer) performance. however, their structure flexibility under working conditions remains a great challenge for identifying their active structures. in this work, oer performances of manganese oxide electrocatalysts with representative phase compositions (birnessite, bixbyite) were examined using operando-raman spectroscopy. the results indicate that catalysts containing birnessite composition do not exhibit apparent oer activity before an charging activation process. shifting of raman peaks around similar to 640 cm(-1) can serve as an indicator for predicting their oer onset potentials. the amorphization of mixed-phase catalyst is in favor of this activation and reduces the oer onset potential by 120 mv. moreover, the coexistence of bixbyite-like mn(iii) center and amorphized birnessite composition combines their abilities of catalyzing both electrochemical and chemical steps, creating a more bias-efficient reaction channel. this leads to the lowest tafel slope and improved activity in the high overpotential region, suggesting that amorphous oer catalysts with structural flexibility can facilitate the oer kinetics. (c) 2018 published by elsevier inc. |
| WOS关键词 | ELECTROCHEMICAL WATER OXIDATION ; RAY-ABSORPTION SPECTROSCOPY ; CHARGE STORAGE MECHANISM ; HEXAGONAL BIRNESSITE ; METAL-OXIDES ; CATALYSTS ; ALPHA-MN2O3 ; EFFICIENT ; ELECTRODE ; KINETICS |
| WOS研究方向 | Chemistry ; Engineering |
| WOS类目 | Chemistry, Physical ; Engineering, Chemical |
| 语种 | 英语 |
| 出版者 | ACADEMIC PRESS INC ELSEVIER SCIENCE |
| WOS记录号 | WOS:000452578700006 |
| URI标识 | http://www.irgrid.ac.cn/handle/1471x/2372979 |
| 专题 | 大连化学物理研究所 |
| 通讯作者 | Fan, Fengtao; Li, Can |
| 作者单位 | 1.Chinese Acad Sci, Dalian Natl Lab Clean Energy, Collaborat Innovat Ctr Chem Energy Mat iChEM, State Key Lab Catalysis,Dalian Inst Chem Phys, Dalian 116023, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China |
| 推荐引用方式 GB/T 7714 | An, Hongyu,Chen, Zheng,Yang, Jingxiu,et al. An operando-raman study on oxygen evolution of manganese oxides: roles of phase composition and amorphization[J]. Journal of catalysis,2018,367:53-61. |
| APA | An, Hongyu.,Chen, Zheng.,Yang, Jingxiu.,Feng, Zhaochi.,Wang, Xiuli.,...&Li, Can.(2018).An operando-raman study on oxygen evolution of manganese oxides: roles of phase composition and amorphization.Journal of catalysis,367,53-61. |
| MLA | An, Hongyu,et al."An operando-raman study on oxygen evolution of manganese oxides: roles of phase composition and amorphization".Journal of catalysis 367(2018):53-61. |
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来源：大连化学物理研究所
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