Graphene Quantum Dots-Supported Palladium Nanoparticles for Efficient Electrocatalytic Reduction of Oxygen in Alkaline Media
Graphene Quantum Dots-Supported Palladium Nanoparticles for Efficient Electrocatalytic Reduction of Oxygen in Alkaline Media
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DOI：
10.1021/acssuschemeng.5b00927
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发表时间：
2015-10
影响因子：
8.4
通讯作者：
Christopher P. Deming;Rene Mercado;Vamsi Gadiraju;S. Sweeney;M. Khan;Shaowei Chen
中科院分区：
文献类型：
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作者：
Christopher P. Deming;Rene Mercado;Vamsi Gadiraju;S. Sweeney;M. Khan;Shaowei Chen
石墨烯量子点（GQD）负载的钯纳米颗粒通过在GQD存在下在80 °C下在1，2-丙二醇中热还原PdCl 2来合成，然后在140至200 °C范围内的升高的温度下进行水热处理。透射电子显微镜测量显示，在≤160 °C的温度下水热处理之前和之后的样品具有树莓状形态，其中约100 μ m的纳米颗粒在水热处理之前和之后的样品具有树莓状形态。8 nm的直径形成直径在50至100 nm范围内的大聚集体，并且在较高的水热温度（180和200 °C）下，形成链状纳米结构。X射线光电子能谱和拉曼光谱的测量结果表明，GQD结构缺陷很容易被水热处理去除，并且缺陷浓度随着水热温度的升高而明显减小，如XPS中含氧碳的损失和拉曼测量中D/G带比的下降所示。卷...
Graphene quantum dots (GQDs)-supported palladium nanoparticles were synthesized by thermolytic reduction of PdCl2 in 1,2-propanediol at 80 °C in the presence of GQDs and then were subject to hydrothermal treatment at an elevated temperature within the range of 140 to 200 °C. Transmission electron microscopic measurements showed a raspberry-like morphology for the samples before and after hydrothermal treatment at temperatures ≤160 °C, where nanoparticles of ca. 8 nm in diameter formed large aggregates in the range of 50 to 100 nm in diameter, and at higher hydrothermal temperatures (180 and 200 °C), chain-like nanostructures were formed instead. X-ray photoelectron and Raman spectroscopic measurements revealed that the GQD structural defects were readily removed by hydrothermal treatments, and the defect concentrations exhibited a clear diminishment with increasing hydrothermal temperature, as indicated by the loss of oxygenated carbons in XPS and a drop in the D to G band ratio in Raman measurements. Vol...