Boosting ORR Electrocatalytic Performance of Metal-Free Mesoporous Biomass Carbon by Synergism of Huge Specific Surface Area and Ultrahigh Pyridinic Nitrogen Doping
Boosting ORR Electrocatalytic Performance of Metal-Free Mesoporous Biomass Carbon by Synergism of Huge Specific Surface Area and Ultrahigh Pyridinic Nitrogen Doping
复制标题
大比表面积和超高吡啶氮掺杂的协同作用提高无金属介孔生物质碳的ORR电催化性能
DOI：
10.1021/acssuschemeng.8b01876
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发表时间：
2018
影响因子：
8.4
通讯作者：
Wang L.
中科院分区：
文献类型：
--
作者：
Zhang B.;Wang C.;Liu D.;Liu Y.;Yu X.;Wang L.
氧还原反应（ORR）在直接甲醇燃料电池中占有重要地位。然而，目前用于ORR的电催化材料使用稀有且昂贵的金属Pt，因此开发具有廉价且高ORR活性的阴极催化剂至关重要。本文以壳聚糖为碳源和氮源的复合前驱体，合成了氮掺杂的介孔生物质碳ORR催化剂。添加不同的致孔剂调节催化剂的比表面积和N型。考察了催化剂的性质与其氧化还原电催化性能的关系。幸运的是，发现添加硝酸铁作为造孔剂产生了巨大的比表面积的N-掺杂介孔生物质碳（1190 m2/g）显着。更重要的是，合成的催化剂中吡啶氮的掺杂量较高（11.58at%），有效地抑制了二电子反应，促进了二电子反应的进行。
Oxygen reduction reaction (ORR) plays a critical position in direct methanol fuel cells. However, electrocatalytic materials currently utilized in ORR use a rare and expensive metal Pt, so it is vital to develop cathode catalysts with cheap and high ORR activity. Herein, chitosan, a natural material made from chitin, was employed as a complex precursor of carbon source and nitrogen (N) source to synthesize N-doped mesoporous biomass carbon ORR catalysts. Adding different pore agents regulated specific surface area and N type of catalysts. The relationship between the properties of the catalysts and their ORR electrocatalytic performance was investigated. It was luckily found that the addition of ferric nitrate as a pore-forming agent created a huge specific surface area of the N-doped mesoporous biomass carbon (1190 m2/g) significantly. More importantly, the synthesized catalyst was doped by whole pyridinic-N at high content (11.58 at %) and inhibited the two-electron reaction efficiently, promoted the fo...