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Preparation and electrocatalytic oxidation performance of Pt/MnO2–graphene oxide nanocomposites
Qizhong Sun,박수진,김석 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.26 No.-
A simple and eco-friendly approach was developed to prepare manganese dioxide functionalized reduced graphene oxide supported Pt nanocomposites (Pt/MnO2–RGO) via chemical reduction process. The morphology and structure of as-prepared catalysts were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), Fourier transform infrared spectra (FT-IR) and X-ray diffraction (XRD). Subsequently, electrochemical properties of catalysts were systematically investigated by cyclic voltammetry (CV). As a result, the ultrafine Pt nanoparticles with an average diameter of 2.9 nm were uniformly dispersed on the MnO2–RGO surface. The Pt/MnO2–RGO catalysts exhibited the superior electrochemical active surface area (79.4 m2 g1) and specific peak current density for methanol oxidation (24.7 mA cm2), compared to Pt/reduced graphene oxide (Pt/RGO) and Pt/carbon black (Pt/CB). The improved electrocatalytic activity was mainly attributed to the better dispersion of Pt nanoparticles as well as the synergistic effect of the modified supports.
Effects of Additives on Nutrients and Fermentation Quality of Alfalfa Silage
Xiaoqing Zhang,Qizhong Sun,Xingyou Li,Xiaoxia Li 한국초지조사료학회 2009 한국초지조사료학회 학술대회논문집 Vol.2009 No.08
Two-year-old, full flower aohan alfalfa (Medicaga sativa cv. aohan) was chosen to evaluate the silage effect by using different additives of Qingbao Ⅱ , Caihe and Yishengkang. Result indicated that additives increased CP content (P<0.05) and decreased CF, ADF and NDF content significantly (P<0.05). Lactic acid content in additives treatments were significantly higher (P<0.01) than control. These result showed that additives improved silage fermentation quality, reduced cellulose contents and improved silage nutritive value. Among three treatments, Caihe and Yishengkang were priority to Qingbao Ⅱ on the effect of promoting the desired lactic acid fermentation.