The metal vapor synthesis (MVS) methed was used to prepare activatedcarbon supported nickel electrode. The electrocatalytic activity of the electrode forhydrogen evolution reaction(HGR) in alkaline solution was studie...The metal vapor synthesis (MVS) methed was used to prepare activatedcarbon supported nickel electrode. The electrocatalytic activity of the electrode forhydrogen evolution reaction(HGR) in alkaline solution was studied. Cathodicpolarization curves showed the electrocatalytic activity of Ni/C electrode prepared byMVS method was higher than that of the one prepared by conventional method.展开更多
The metal vapor synthesis technique was employed to prepare Co nanoparticles. The characteristics and properties of the particles were studied by transmission electron microscopy, X-ray diffraction, temperature-progra...The metal vapor synthesis technique was employed to prepare Co nanoparticles. The characteristics and properties of the particles were studied by transmission electron microscopy, X-ray diffraction, temperature-programmed desorption, chemisorption and magnetic measurements. The experimental results showed that the particle size of Co powders depended on the initial Co concentration in the toluene matrix, reaching average crystallite diameter of 1.5 nm for the highest concentration (6.4 at. pct) investigated. The particles with size of 10 nm exist, due to the agglomerates of microcrystallites. The Co particles were surrounded by a thin carbonaceous layer formed due to toluene decomposition on cocondate melt-down and subsequent warming to room temperature. The carbonaceous layer was composed primarily of C1 fragments. The Co powders demonstrated ferromagnetic behavior.展开更多
Nickel and La Ni alloy electrode materials prepared by metal vapor synthesis were studied by XRD, XPS and magnetic measurement. The experimental results show that La Ni alloy is formed from La and Ni powders. The pa...Nickel and La Ni alloy electrode materials prepared by metal vapor synthesis were studied by XRD, XPS and magnetic measurement. The experimental results show that La Ni alloy is formed from La and Ni powders. The particle size of La Ni alloy and Ni powders are very small with average diameter <4 nm. Nickel is mainly in zero valent state and lanthanum exists as both metallic La and La 2O 3. The cathodic polarization characteristics of the electrodes obtained from above powders in alkaline solutions were also studied. It is found that the La Ni alloy electrode has a higher electrocatalytic activity than the Ni and La electrodes.展开更多
文摘The metal vapor synthesis (MVS) methed was used to prepare activatedcarbon supported nickel electrode. The electrocatalytic activity of the electrode forhydrogen evolution reaction(HGR) in alkaline solution was studied. Cathodicpolarization curves showed the electrocatalytic activity of Ni/C electrode prepared byMVS method was higher than that of the one prepared by conventional method.
文摘The metal vapor synthesis technique was employed to prepare Co nanoparticles. The characteristics and properties of the particles were studied by transmission electron microscopy, X-ray diffraction, temperature-programmed desorption, chemisorption and magnetic measurements. The experimental results showed that the particle size of Co powders depended on the initial Co concentration in the toluene matrix, reaching average crystallite diameter of 1.5 nm for the highest concentration (6.4 at. pct) investigated. The particles with size of 10 nm exist, due to the agglomerates of microcrystallites. The Co particles were surrounded by a thin carbonaceous layer formed due to toluene decomposition on cocondate melt-down and subsequent warming to room temperature. The carbonaceous layer was composed primarily of C1 fragments. The Co powders demonstrated ferromagnetic behavior.
文摘Nickel and La Ni alloy electrode materials prepared by metal vapor synthesis were studied by XRD, XPS and magnetic measurement. The experimental results show that La Ni alloy is formed from La and Ni powders. The particle size of La Ni alloy and Ni powders are very small with average diameter <4 nm. Nickel is mainly in zero valent state and lanthanum exists as both metallic La and La 2O 3. The cathodic polarization characteristics of the electrodes obtained from above powders in alkaline solutions were also studied. It is found that the La Ni alloy electrode has a higher electrocatalytic activity than the Ni and La electrodes.
