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Tuning the surface energy density of non-stoichiometric LaCoO3 perovskite for enhanced water oxidation
Wang, Y; Shen, XJ; Arandiyan, H; Yin, YT; Sun, FF; Chen, XJ; Garbrecht, M; Han, L; Andersson, GG; Zhao, C
2020
Source PublicationJOURNAL OF POWER SOURCES
ISSN0378-7753
Volume478Pages:-
Subtype期刊论文
AbstractTailoring the surface structure of Earth-abundant perovskite oxides can provide cost-effective, high-efficient, and durable electrocatalysts for oxygen evolution reaction (OER). However, the structural origin leading to high OER performance of perovskite is not fully understood. Here, we present a strategy of tuning the surface energy density of non-stoichiometric perovskite by creating surface defects in the 3D inverse opal LaCoO3-x (3DIO-LaCoO3-x) through a colloidal template strategy. The defective 3DIO-LaCoO3-x, which has an enhanced surface energy density and a shift in the d-band centre of Co relative to the Fermi level, demonstrates significantly improved intrinsic OER activity, with a TOF (0.21 s(-1)) ten-folder larger than that of conventional LaCoO3 nanoparticles (0.02 s(-1)). The defective surfaces of 3DIO-LaCoO3-x are theoretically proven to alter the rate determining step of OER and significantly reduce the adsorption energies of the intermediate species, resulting in dramatically enhanced OER activity. Moreover, rich surface defects with high electrical conductivity can mitigate structural corrosion by fast transfer of charge through defective conductive channels, and thus enables longterm stability for the defective 3DIO-LaCoO3-x. These results provide an effective approach for enhancing the intrinsic activity of perovskite for water oxidation towards understanding the surface structure engineering for perovskite-based materials.
KeywordEVOLUTION REACTION ACTIVITY OXYGEN EVOLUTION EFFICIENT PERFORMANCE CATALYSIS VACANCIES ELECTROCATALYSIS REDUCTION STATE OXIDE
DOI10.1016/j.jpowsour.2020.228748
Indexed BySCI ; EI
Language英语
Citation statistics
Document Type期刊论文
Identifierhttp://ir.sinap.ac.cn/handle/331007/33231
Collection中科院上海应用物理研究所2011-2020年
Affiliation1.Univ New South Wales, Fac Sci, Sch Chem, Sydney, NSW, Australia
2.Zhengzhou Univ, Coll Chem Engn, Zhengzhou 450001, Peoples R China
3.Univ Sydney, Sch Chem, Lab Adv Catalysis Sustainabil, Sydney, NSW 2006, Australia
4.Flinders Univ S Australia, Flinders Inst Nanoscale Sci & Technol, Adelaide, SA 5042, Australia
5.Flinders Univ S Australia, Coll Sci & Engn, Flinders Microscopy & Microanal, Adelaide, SA 5042, Australia
6.Chinese Acad Sci, Shanghai Inst Appl Phys, Shanghai 201204, Peoples R China
7.Univ Sydney, Australian Ctr Microscopy & Microanal, Sydney, NSW 2006, Australia
8.Zhengzhou Univ, Sch Ecol & Environm, Zhengzhou 450001, Peoples R China
Recommended Citation
GB/T 7714
Wang, Y,Shen, XJ,Arandiyan, H,et al. Tuning the surface energy density of non-stoichiometric LaCoO3 perovskite for enhanced water oxidation[J]. JOURNAL OF POWER SOURCES,2020,478:-.
APA Wang, Y.,Shen, XJ.,Arandiyan, H.,Yin, YT.,Sun, FF.,...&Zhao, C.(2020).Tuning the surface energy density of non-stoichiometric LaCoO3 perovskite for enhanced water oxidation.JOURNAL OF POWER SOURCES,478,-.
MLA Wang, Y,et al."Tuning the surface energy density of non-stoichiometric LaCoO3 perovskite for enhanced water oxidation".JOURNAL OF POWER SOURCES 478(2020):-.
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