Facile preparation of modified carbon black-LaMnO3 hybrids and the effect of covalent coupling on the catalytic activity for oxygen reduction reaction

doi:10.1016/S1872-2067(14)60066-8

Abstract

Abstract:

Covalent coupling between LaMnO₃nanoparticles and carbon black to produce a composite catalyst for oxygen reduction reaction (ORR) was achieved by physical mixing of modified carbon and perovskite-type LaMnO₃ nanoparticles, followed by sintering at different temperatures. Perovskite-type LaMnO₃ nanoparticles were first synthesized via chemical precipitation, and the carbon support (Vulcan XC-72) was modified using graphitization, followed by HNO₃ and ammonia treatments. The morphology and electronic states of the carbon black-LaMnO₃ hybrid catalyst were characterized by scanning electron microscopy, X-ray diffraction, and X-ray photoelectron spectroscopy. The loaded LaMnO₃ particles featured rod-like, three bars-like, and bamboo rod-like structures and were homogeneously dispersed in the carbon matrix that featured a hollow spherical structure. At a sintering temperature of about 300℃, C-O-M (M=La, Mn) bonds formed at the interface between the carbon and LaMnO₃ nanoparticles. Electrochemical measurements in 1 mol/L NaOH showed that the carbon-LaMnO₃ hybrid prepared at a LaMnO₃/GCB mass ratio of 2:3 displayed the highest electrocatalytic activity towards ORR among all the synthesized hybrid catalysts. The electrocatalytic activity was comparable with that obtained by commercial Pt/C catalyst (E-TEK). The average electron transfer number of ORR was ~3.81, and the corresponding yield of the hydrogen peroxide intermediatewas ~9.5%. The remarkably improved electrocatalytic activity towards ORR was likely because of the formation of covalent bonds (C-O-M) between the LaMnO₃ nanoparticles and carbon that can effectively enhance the ORR kinetics. This information is important to understand the physical origin of the electrocatalytic activity of carbon-supported rare earth oxides as catalysts for ORR.

Key words: LaMnO₃particle, Carbon black, Electrocatalytic, Covalent coupling, Oxygen reduction reaction

Jingjun Liu, Xuemin Jin, Weiwei Song, Feng Wang, Nan Wang, Ye Song. Facile preparation of modified carbon black-LaMnO₃ hybrids and the effect of covalent coupling on the catalytic activity for oxygen reduction reaction[J]. Chinese Journal of Catalysis, 2014, 35(7): 1173-1188.

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URL: https://www.cjcatal.com/EN/10.1016/S1872-2067(14)60066-8

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Facile preparation of modified carbon black-LaMnO₃ hybrids and the effect of covalent coupling on the catalytic activity for oxygen reduction reaction

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