A red-blood-cell-like nitrogen-doped porous carbon catalyst with a high nitrogen content(9.81%)and specific surface area(631.46 m^2/g)was prepared by using melamine cyanuric acid and glucose as sacrificial template an...A red-blood-cell-like nitrogen-doped porous carbon catalyst with a high nitrogen content(9.81%)and specific surface area(631.46 m^2/g)was prepared by using melamine cyanuric acid and glucose as sacrificial template and carbon source,respectively.This catalyst has a comparable onset potential and a higher diffusion-limiting current density than the commercial 20 wt%Pt/C catalyst in alkaline electrolyte.The oxygen reduction reaction mechanism catalyzed by this catalyst is mainly through a 4e pathway process.The excellent catalytic activity could origin from the synergistic effect of the in-situ doped nitrogen(up to 9.81%)and three-dimensional(3D)porous network structure with high specific surface area,which is conducive to the exposure of more active sites.It is interesting to note that the catalytic activity of oxygen reduction strongly depends on the proportion of graphic N rather than the total N content.展开更多
以壳聚糖作为碳源和氮源、聚苯乙烯(PS球)为模板,采用一步热解法得到蜂窝状结构的氮掺杂有序多孔碳材料。SEM观察表明,与未添加模板剂得到的氮掺杂碳材料相比,添加了模板剂得到的氮掺杂多孔碳材料出现明显的有序蜂窝结构。电化学性能测...以壳聚糖作为碳源和氮源、聚苯乙烯(PS球)为模板,采用一步热解法得到蜂窝状结构的氮掺杂有序多孔碳材料。SEM观察表明,与未添加模板剂得到的氮掺杂碳材料相比,添加了模板剂得到的氮掺杂多孔碳材料出现明显的有序蜂窝结构。电化学性能测试结果显示,该蜂窝状氮掺杂有序碳材料的起始电位(0.91 V)、半波电位(0.77 V)与极限电流密度(3.6 m A/cm2)有明显提高。氧还原电催化性能的提高可能是由于加入PS球模板剂之后产生的蜂窝状结构显著增大了比表面积,同时促进了传质作用,方便产物的脱附,并且提高了碳材料的缺陷程度。展开更多
基金Projects(21571189,21771062)supported by the National Natural Science Foundation of ChinaProjects(2016TP1007,2017TP1001)supported by the Hunan Provincial Science and Technology Plan,China+1 种基金Project(150110005)supported by the Fundamental Research and Innovation Project for Postgraduate of Hunan Province,ChinaProjects(2016CL04,2017CL17)supported by the Opening Project of Material Corrosion and Protection Key Laboratory of Sichuan Province,China
文摘A red-blood-cell-like nitrogen-doped porous carbon catalyst with a high nitrogen content(9.81%)and specific surface area(631.46 m^2/g)was prepared by using melamine cyanuric acid and glucose as sacrificial template and carbon source,respectively.This catalyst has a comparable onset potential and a higher diffusion-limiting current density than the commercial 20 wt%Pt/C catalyst in alkaline electrolyte.The oxygen reduction reaction mechanism catalyzed by this catalyst is mainly through a 4e pathway process.The excellent catalytic activity could origin from the synergistic effect of the in-situ doped nitrogen(up to 9.81%)and three-dimensional(3D)porous network structure with high specific surface area,which is conducive to the exposure of more active sites.It is interesting to note that the catalytic activity of oxygen reduction strongly depends on the proportion of graphic N rather than the total N content.
文摘以壳聚糖作为碳源和氮源、聚苯乙烯(PS球)为模板,采用一步热解法得到蜂窝状结构的氮掺杂有序多孔碳材料。SEM观察表明,与未添加模板剂得到的氮掺杂碳材料相比,添加了模板剂得到的氮掺杂多孔碳材料出现明显的有序蜂窝结构。电化学性能测试结果显示,该蜂窝状氮掺杂有序碳材料的起始电位(0.91 V)、半波电位(0.77 V)与极限电流密度(3.6 m A/cm2)有明显提高。氧还原电催化性能的提高可能是由于加入PS球模板剂之后产生的蜂窝状结构显著增大了比表面积,同时促进了传质作用,方便产物的脱附,并且提高了碳材料的缺陷程度。
