The oxidation of methanol was investigated on platinum-modified polyaniline electrode. Changes in the electrode rotation rates (Ω) during platinum electrodeposition remarkably affect the formation and distribution o...The oxidation of methanol was investigated on platinum-modified polyaniline electrode. Changes in the electrode rotation rates (Ω) during platinum electrodeposition remarkably affect the formation and distribution of platinum in the polymer matrix and consequently lead to different currents of methanol oxidation. The results show that platinum loading is proportional to rotation ratesΩ1/2.展开更多
Pt-diffused coatings were synthesized on Ni10 Al alloy by electroplating a thin layer of Pt(1-5μm)followed by a diffusion treatment in vacuum at 1000-1100℃.Effects of processing parameters(Pt thickness and vacuum di...Pt-diffused coatings were synthesized on Ni10 Al alloy by electroplating a thin layer of Pt(1-5μm)followed by a diffusion treatment in vacuum at 1000-1100℃.Effects of processing parameters(Pt thickness and vacuum diffusion temperature)on the microstructures and chemical composition of Pt-diffused coatings were investigated.Also,the oxidation behavior of the coatings was studied at1100℃.Pt film reveals nano-sized grain size of 93-113 nm.Vacuum diffusion treatment leads to the grain growth.1-μm Pt film with 1000℃/1 h vacuum diffusion fabricates nano-sized Pt-diffused coating which exhibits the best oxidation resistance.And a single continuous Al2O3 scale forms on the coating with low Al(~9 at%)and Pt(~6 at%)contents.Increasing initial Pt thickness would introduce more defects and cracks,leading to a duplex scale and decreasing the oxidation resistance of Ptdiffused coatings.展开更多
文摘The oxidation of methanol was investigated on platinum-modified polyaniline electrode. Changes in the electrode rotation rates (Ω) during platinum electrodeposition remarkably affect the formation and distribution of platinum in the polymer matrix and consequently lead to different currents of methanol oxidation. The results show that platinum loading is proportional to rotation ratesΩ1/2.
基金financially supported by the Nature Science Foundations of China(Nos.51590894,51425102 and 51231001)。
文摘Pt-diffused coatings were synthesized on Ni10 Al alloy by electroplating a thin layer of Pt(1-5μm)followed by a diffusion treatment in vacuum at 1000-1100℃.Effects of processing parameters(Pt thickness and vacuum diffusion temperature)on the microstructures and chemical composition of Pt-diffused coatings were investigated.Also,the oxidation behavior of the coatings was studied at1100℃.Pt film reveals nano-sized grain size of 93-113 nm.Vacuum diffusion treatment leads to the grain growth.1-μm Pt film with 1000℃/1 h vacuum diffusion fabricates nano-sized Pt-diffused coating which exhibits the best oxidation resistance.And a single continuous Al2O3 scale forms on the coating with low Al(~9 at%)and Pt(~6 at%)contents.Increasing initial Pt thickness would introduce more defects and cracks,leading to a duplex scale and decreasing the oxidation resistance of Ptdiffused coatings.
