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Study Findings on Chalcogens Are Outlined in Reports from Beijing University of Chemical Technology (Facile preparation of modified carbon...

August 19, 2014



Study Findings on Chalcogens Are Outlined in Reports from Beijing University of Chemical Technology (Facile preparation of modified carbon black-LaMnO3 hybrids and the effect of covalent coupling on the catalytic activity for oxygen reduction ...)

By a News Reporter-Staff News Editor at Life Science Weekly -- Current study results on Chalcogens have been published. According to news reporting originating from Beijing, People's Republic of China, by NewsRx correspondents, research stated, "Covalent coupling between LaMnO3 nanoparticles 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. Perovskitetype 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."

Our news editors obtained a quote from the research from the Beijing University of Chemical Technology, "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 degrees C, 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 similar to 3.81, and the corresponding yield of the hydrogen peroxide intermediate was similar to 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."

According to the news editors, the research concluded: "This information is important to understand the physical origin of the electrocatalytic activity of carbon-supported rare earth oxides as catalysts for ORR."

For more information on this research see: Facile preparation of modified carbon black-LaMnO3 hybrids and the effect of covalent coupling on the catalytic activity for oxygen reduction reaction. Chinese Journal of Catalysis, 2014;35(7):1173-1188. Chinese Journal of Catalysis can be contacted at: Science Press, 16 Donghuangchenggen North St, Beijing 100717, Peoples R China. (Elsevier - www.elsevier.com; Chinese Journal of Catalysis - www.elsevier.com/wps/product/cws_home/709300)

The news editors report that additional information may be obtained by contacting J.J. Liu, Beijing University of Chemical Technology, Beijing Key Lab Electrochem Proc & Technol Mat, State Key Lab Chem Resource Engn, Beijing 100029, People's Republic of China. Additional authors for this research include X.M. Jin, W.W. Song, F. Wang, N. Wang and Y. Song (see also Chalcogens).

Keywords for this news article include: Asia, Beijing, Chalcogens, Nanoparticle, Nanotechnology, Emerging Technologies, People's Republic of China

Our reports deliver fact-based news of research and discoveries from around the world. Copyright 2014, NewsRx LLC


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Source: Life Science Weekly


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