How Key Characteristics of Carbon Materials Influence the ORR Activity of LaMnO3- and Mn3O4-Carbon Composites Prepared by in situ Autocombustion Method | Sciact - CRIS-система Института катализа

How Key Characteristics of Carbon Materials Influence the ORR Activity of LaMnO3- and Mn3O4-Carbon Composites Prepared by in situ Autocombustion Method Научная публикация

Журнал

Electrochimica Acta
ISSN: 0013-4686 , E-ISSN: 1873-3859

Вых. Данные

Год: 2020, Том: 353, Номер статьи : 136557, Страниц : 14 DOI: 10.1016/j.electacta.2020.136557

Ключевые слова

LaMnO3- and Mn3O4e carbon composites; Oxygen reduction reaction; Oxidation degree; Sub-structural parameters; Porosity

Авторы

Kéranguéven Gwénaëlle ¹ , Bouillet Corinne ² , Papaefthymiou Vasiliki ¹ , Simonov Pavel A. ³ , Savinova Elena R. ¹

Организации

1	ICPEES UMR7515-CNRS-Université de Strasbourg, 25 Rue Becquerel, 67087, Strasbourg Cedex 2, France
2	IPCMS – Département Surfaces et Interfaces (DSI), 23 Rue Du Lœss, Strasbourg, 67034, France
3	Group of Noble Metal Based Heterogeneous Catalysts, Boreskov Institute of Catalysis, SB RAS, Prospekt Academika Lavrentieva 5, 630090, Novosibirsk, Russia

Информация о финансировании (1)

Région Alsace

1026/12/C

In this work we studied the effect of carbon in LaMnO3- and Mn3O4- carbon composites synthesized through the In Situ Auto Combustion (ISAC) route for the Oxygen Reduction Reaction (ORR). For this study, we prepared LaMnO3 perovskite and Mn3O4 spinel composites using different types of carbon materials: carbon blacks, pyrolytic carbons, and catalytic filamentous carbon. Various analytical methods such as cyclic voltammetry, rotating ring disc electrode, Brunauer-Emmett-Teller (BET) method, X-Ray Powder Diffraction (XRD), thermogravimetric analysis (TGA), X-ray Photoelectron Spectroscopy (XPS), Transmission Electron Microscopy (TEM) and Electron Energy Loss Spectroscopy (EELS) were used to shed light on the influence of carbon in LaMnO3- and Mn3O4 - carbon composites during the ORR. These allowed us to define key characteristics of carbon materials, which determine the ORR activity and selectivity of the composites, among them sub-structural characteristics of carbon materials and pore accessibility. We conclude that (i) the ISAC route allows to significantly increase the number of accessible oxide sites and the ensuing ORR activity, (ii) the oxidation degree of Mn in LaMnO3 depends on the type and wt.% of carbon material and sub-structural order of carbon. (iii) We further claim that sub-structural characteristics of carbon materials, their pore size and size distribution affect the ORR activity of LaMnO3- and Mn3O4 - carbon composites. (iv) We see that an optimum combination of the carbon and the metal oxide allows obtaining the highest ORR activity. (v) Vulcan XC72 carbon seems to be the best suited for the ISAC synthesis of metal oxide-carbon composites due to its high structure consisting of highly branched flexible reticulate agglomerates.

Kéranguéven G. , Bouillet C. , Papaefthymiou V. , Simonov P.A. , Savinova E.R.
How Key Characteristics of Carbon Materials Influence the ORR Activity of LaMnO3- and Mn3O4-Carbon Composites Prepared by in situ Autocombustion Method

Electrochimica Acta. 2020. V.353. 136557 :1-14. DOI: 10.1016/j.electacta.2020.136557 WOS Scopus РИНЦ CAPlusCA OpenAlex

Полный текст от издателя

Поступила в редакцию:	6 февр. 2020 г.
Принята к публикации:	30 мая 2020 г.
Опубликована online:	10 июн. 2020 г.
Опубликована в печати:	1 сент. 2020 г.

Web of science:	WOS:000552978500010
Scopus:	2-s2.0-85086730566
РИНЦ:	43302738
Chemical Abstracts:	2020:1216751
Chemical Abstracts (print):	173:447187
OpenAlex:	W3034475408

БД	Цитирований
Scopus	15
Web of science	11
РИНЦ	11
OpenAlex	17