Carbon nanotubes with diameters ranging between 140～220nm was synthesized with chemical vapor deposition method, and treated using nitric acid as oxidant. Pt/C catalysts were prepared using untreated and treated carb...Carbon nanotubes with diameters ranging between 140～220nm was synthesized with chemical vapor deposition method, and treated using nitric acid as oxidant. Pt/C catalysts were prepared using untreated and treated carbon nanotubes as supports, respectively. TEM and FT IR differential spectra showed that treated carbon nanotubes become short and possess more oxygen containing surface groups. The electrochemical studies indicated that the Pt/treated carbon nanotubes catalyst possessed much higher electrocatalytic activity for the oxidation of methanol than that of the Pt/untreated carbon nanotubes catalyst.展开更多
Ni(OH)2 including 20%Al was synthesized by solid state reaction. The result of XRD indicated that the sample thus prepared was α Ni(OH)2, and its size and crystalline form were much poorer than those of the sample pr...Ni(OH)2 including 20%Al was synthesized by solid state reaction. The result of XRD indicated that the sample thus prepared was α Ni(OH)2, and its size and crystalline form were much poorer than those of the sample prepared by solution state reaction. TG and DTA curves showed that α Ni(OH)2 began to decompose at higher temperature than β Ni(OH)2. The electrochemical behaviorsof the sample were studied by cyclic voltammetry and constant current charge discharge experiment. It was found that the sample by solid state reaction hadmore excellent electrode reversibility, higher discharge potential and higher discharge capacity.展开更多
比较了甲醇对 Pt/C和炭载四羧基酞菁钴 (Co Pc Tc/C)催化氧还原性能的影响 .结果表明 ,甲醇使Pt/C催化氧还原的性能严重降低 ,而对经 80 0℃热处理的 Co Pc Tc/C(Co Pc Tc/C-80 0 )基本没有影响 ;并且Co Pc Tc/C-80 0催化氧还原的性能...比较了甲醇对 Pt/C和炭载四羧基酞菁钴 (Co Pc Tc/C)催化氧还原性能的影响 .结果表明 ,甲醇使Pt/C催化氧还原的性能严重降低 ,而对经 80 0℃热处理的 Co Pc Tc/C(Co Pc Tc/C-80 0 )基本没有影响 ;并且Co Pc Tc/C-80 0催化氧还原的性能优于经其它温度热处理的 Co Pc Tc/C,Co Pc Tc/C-80 0是一种较好的直接甲醇燃料电池的耐甲醇阴极电催化剂 .XPS结果表明 ,Co Pc Tc/C-80 0的活性位可能是含 Co N4结构的物质和零价 Co的混合物 .展开更多
文摘Carbon nanotubes with diameters ranging between 140～220nm was synthesized with chemical vapor deposition method, and treated using nitric acid as oxidant. Pt/C catalysts were prepared using untreated and treated carbon nanotubes as supports, respectively. TEM and FT IR differential spectra showed that treated carbon nanotubes become short and possess more oxygen containing surface groups. The electrochemical studies indicated that the Pt/treated carbon nanotubes catalyst possessed much higher electrocatalytic activity for the oxidation of methanol than that of the Pt/untreated carbon nanotubes catalyst.
文摘Ni(OH)2 including 20%Al was synthesized by solid state reaction. The result of XRD indicated that the sample thus prepared was α Ni(OH)2, and its size and crystalline form were much poorer than those of the sample prepared by solution state reaction. TG and DTA curves showed that α Ni(OH)2 began to decompose at higher temperature than β Ni(OH)2. The electrochemical behaviorsof the sample were studied by cyclic voltammetry and constant current charge discharge experiment. It was found that the sample by solid state reaction hadmore excellent electrode reversibility, higher discharge potential and higher discharge capacity.
文摘比较了甲醇对 Pt/C和炭载四羧基酞菁钴 (Co Pc Tc/C)催化氧还原性能的影响 .结果表明 ,甲醇使Pt/C催化氧还原的性能严重降低 ,而对经 80 0℃热处理的 Co Pc Tc/C(Co Pc Tc/C-80 0 )基本没有影响 ;并且Co Pc Tc/C-80 0催化氧还原的性能优于经其它温度热处理的 Co Pc Tc/C,Co Pc Tc/C-80 0是一种较好的直接甲醇燃料电池的耐甲醇阴极电催化剂 .XPS结果表明 ,Co Pc Tc/C-80 0的活性位可能是含 Co N4结构的物质和零价 Co的混合物 .
