Pt/Ni catalysts modified with CeO2 nanoparticles were prepared by simple composite electrodeposition of Ni and CeO2,and spontaneous Ni partial replacement by Pt processes.The as-prepared CeO2-modified Pt/Ni catalysts ...Pt/Ni catalysts modified with CeO2 nanoparticles were prepared by simple composite electrodeposition of Ni and CeO2,and spontaneous Ni partial replacement by Pt processes.The as-prepared CeO2-modified Pt/Ni catalysts showed enhanced catalytic performance for ethanol electro-oxidation compared with pure Pt/Ni,and acetate species were proposed to be the main products of the oxidation when using these catalysts.The content of CeO2 in the as-prepared catalysts influenced their catalytic activity,with Pt/NiCe2（obtained from an electrolyte containing 100 mg/L CeO2 nanoparticles） exhibiting higher activity and relatively better stability in ethanol electro-oxidation.This was mainly due to the oxygen storage capacity of CeO2,the interaction between Pt and CeO2/Ni,and the relatively small contact and charge transfer resistances.The results of this work thus suggest that electrocatalysts with low price and high activity can be rationally designed and produced by a simple route for use in direct ethanol fuel cells.展开更多
The oxidation of ethanol in 1 .0 mol/L NaOH was studied on Pd/GC electrode preparedby electrodeposition. The results show that (1) Pd/GC electrode can also demonstrateclectrocatalytic activity towards the oxidation o...The oxidation of ethanol in 1 .0 mol/L NaOH was studied on Pd/GC electrode preparedby electrodeposition. The results show that (1) Pd/GC electrode can also demonstrateclectrocatalytic activity towards the oxidation of cthanolf (2) two backward anodic peaks on thecathodic branch appear when the ethanol concentration is raised up to 0.5 mol/L.展开更多
High performance platinized-carbon electrodes have been developed for the electrocatalytic oxidation of ethanol to acetaldehyde in electrogenerative processes. A load current density of the electrode can be achieved a...High performance platinized-carbon electrodes have been developed for the electrocatalytic oxidation of ethanol to acetaldehyde in electrogenerative processes. A load current density of the electrode can be achieved as high as 600 mA per square centimeter for oxygen reducing in 3 mol/L sulfuric acid with a good stability. With these electrodes and sulfuric acid as an electrolyte in fuel cells, ethanol vapor carried by nitrogen gas can be oxidized selectively to acetaldehyde. Selectivity of acetaldehyde depends on the potential of the cell and the feed rate of ethanol vapor and it can be more than 80% under optimized conditions. The initial product of ethanol oxidized on a platinized-carbon electrode is acetaldehyde and the ethanol oxidation mechanism is discussed.展开更多
The effect of 2-butyne-1, 4-diol （BD） on the deposition behavior of the Co-Ni alloy was investigated by linear sweep voltammetry. The results showed that BD could prevent the deposition of the Co-Ni alloy. The effec...The effect of 2-butyne-1, 4-diol （BD） on the deposition behavior of the Co-Ni alloy was investigated by linear sweep voltammetry. The results showed that BD could prevent the deposition of the Co-Ni alloy. The effect of BD concentration in the sulfate plating bath, on the structure of the Co-Ni deposit was studied by energy dispersive x-ray spectroscopy, scanning electron microscope, and X-ray diffraction, respectively. As a result, BD could smoothen the deposit surface and decrease the diameter of the grain, but too much of BD was not good for the size of the grain. In general, a hexagonal close-packed （hcp） phase of the Co-Ni alloy, with a preferentially oriented （110） plane, was prepared by electrodeposition in the presence of BD. The Co-Ni alloy as a catalyst for the electro-oxidation of ethanol in alkaline medium was investigated by cyclic voltammetry. The deposit plated from the bath containing BD possessed better electro-oxidation of ethanol performance compared with that of the deposit plated from only the sulfate plating bath, but too much of BD was not beneficial for catalytic activity. The Co-Ni film was suitable as a magnetic recording material.展开更多
采用电沉积法在硫酸铜加乳酸的体系下制备氧化亚铜(Cu_(2)O)薄膜催化剂,通过不同电极基底探究了其空间结构及化学组成对电催化反应性能的影响。在此基础上,利用泡沫铜三维多孔结构及Cu-Cu_(2)O协同作用制备了Cu_(2)O薄膜催化电极(Cu-foa...采用电沉积法在硫酸铜加乳酸的体系下制备氧化亚铜(Cu_(2)O)薄膜催化剂,通过不同电极基底探究了其空间结构及化学组成对电催化反应性能的影响。在此基础上,利用泡沫铜三维多孔结构及Cu-Cu_(2)O协同作用制备了Cu_(2)O薄膜催化电极(Cu-foam@Cu_(2)O-film),提高Cu_(2)O对醇类产物的选择性和催化剂稳定性。结果表明,在0.5 mol/L KHCO_(3)电解液及-0.9 V vs.Ag/AgCl电位下,醇类总法拉第效率为33.2%,相比于传统碳纸基底电极(Carbon@Cu_(2)O-film)提高了近3倍。展开更多
基金supported by the National Natural Science Foundation of China (21307038 and 21577046)Key Project of Chinese Ministry of Education (212115)Physical Chemistry Experiment of Huanggang Normal University (2015CK12)~~
文摘Pt/Ni catalysts modified with CeO2 nanoparticles were prepared by simple composite electrodeposition of Ni and CeO2,and spontaneous Ni partial replacement by Pt processes.The as-prepared CeO2-modified Pt/Ni catalysts showed enhanced catalytic performance for ethanol electro-oxidation compared with pure Pt/Ni,and acetate species were proposed to be the main products of the oxidation when using these catalysts.The content of CeO2 in the as-prepared catalysts influenced their catalytic activity,with Pt/NiCe2（obtained from an electrolyte containing 100 mg/L CeO2 nanoparticles） exhibiting higher activity and relatively better stability in ethanol electro-oxidation.This was mainly due to the oxygen storage capacity of CeO2,the interaction between Pt and CeO2/Ni,and the relatively small contact and charge transfer resistances.The results of this work thus suggest that electrocatalysts with low price and high activity can be rationally designed and produced by a simple route for use in direct ethanol fuel cells.
文摘The oxidation of ethanol in 1 .0 mol/L NaOH was studied on Pd/GC electrode preparedby electrodeposition. The results show that (1) Pd/GC electrode can also demonstrateclectrocatalytic activity towards the oxidation of cthanolf (2) two backward anodic peaks on thecathodic branch appear when the ethanol concentration is raised up to 0.5 mol/L.
基金Supported Partially by the Ministry of Education of China.
文摘High performance platinized-carbon electrodes have been developed for the electrocatalytic oxidation of ethanol to acetaldehyde in electrogenerative processes. A load current density of the electrode can be achieved as high as 600 mA per square centimeter for oxygen reducing in 3 mol/L sulfuric acid with a good stability. With these electrodes and sulfuric acid as an electrolyte in fuel cells, ethanol vapor carried by nitrogen gas can be oxidized selectively to acetaldehyde. Selectivity of acetaldehyde depends on the potential of the cell and the feed rate of ethanol vapor and it can be more than 80% under optimized conditions. The initial product of ethanol oxidized on a platinized-carbon electrode is acetaldehyde and the ethanol oxidation mechanism is discussed.
基金supported by the Natural Science Foundation of Fujian Province,China(Grant No.2006J0440).
文摘The effect of 2-butyne-1, 4-diol （BD） on the deposition behavior of the Co-Ni alloy was investigated by linear sweep voltammetry. The results showed that BD could prevent the deposition of the Co-Ni alloy. The effect of BD concentration in the sulfate plating bath, on the structure of the Co-Ni deposit was studied by energy dispersive x-ray spectroscopy, scanning electron microscope, and X-ray diffraction, respectively. As a result, BD could smoothen the deposit surface and decrease the diameter of the grain, but too much of BD was not good for the size of the grain. In general, a hexagonal close-packed （hcp） phase of the Co-Ni alloy, with a preferentially oriented （110） plane, was prepared by electrodeposition in the presence of BD. The Co-Ni alloy as a catalyst for the electro-oxidation of ethanol in alkaline medium was investigated by cyclic voltammetry. The deposit plated from the bath containing BD possessed better electro-oxidation of ethanol performance compared with that of the deposit plated from only the sulfate plating bath, but too much of BD was not beneficial for catalytic activity. The Co-Ni film was suitable as a magnetic recording material.
文摘采用电沉积法在硫酸铜加乳酸的体系下制备氧化亚铜(Cu_(2)O)薄膜催化剂,通过不同电极基底探究了其空间结构及化学组成对电催化反应性能的影响。在此基础上,利用泡沫铜三维多孔结构及Cu-Cu_(2)O协同作用制备了Cu_(2)O薄膜催化电极(Cu-foam@Cu_(2)O-film),提高Cu_(2)O对醇类产物的选择性和催化剂稳定性。结果表明,在0.5 mol/L KHCO_(3)电解液及-0.9 V vs.Ag/AgCl电位下,醇类总法拉第效率为33.2%,相比于传统碳纸基底电极(Carbon@Cu_(2)O-film)提高了近3倍。
