Pt/Ni catalysts modified with CeO2 nanoparticles were prepared by simple composite electrodeposition of Ni and CeO2,and spontaneous Ni partial replacement by Pt *** as-prepared CeO2-modified Pt/Ni catalysts showed enh...
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Pt/Ni catalysts modified with CeO2 nanoparticles were prepared by simple composite electrodeposition of Ni and CeO2,and spontaneous Ni partial replacement by Pt *** 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 *** 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 *** 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 *** 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.
以Na OH和NH3·H2O为沉淀剂,采用共沉淀法成功合成富锂锰基层状正极材料。通过X射线粉末衍射(XRD)、拉曼光谱、扫描电子显微镜(SEM)、循环伏安法(CV)、电化学阻抗谱(EIS)和充放电测试等研究手段,重点探讨了不同镍钴锰比对富锂锰基层状正极材料的结构、形貌以及电化学性能的影响。其中Li1.2Mn0.54Ni0.13Co0.13O2正极材料结晶度高,粒度分布均匀,无明显团聚现象。在0.1C倍率下首次放电比容量为247.9 m A·h·g-1,首次库仑效率为75.1%。在1C倍率下首次放电比容量为236.2 m A·h·g-1,经过50次充放电循环后放电比容量为218.4 m A·h·g-1,容量保持率为88.3%,展现出较好的循环稳定性。
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