湖沥青基ORR电催化剂的制备、表征与性能研究

Preparation,characterization and performance of lake asphalt based ORR electrocatalyst

以湖沥青为碳源,以球形γ-Fe_(2)O_(3)为模板,加入合成的CuZn-ZIF材料,获得一种复合前驱体(命名为CuZn-ZIF@湖沥青-γ-Fe_(2)O_(3)),经高温热解得到一种高效ORR电催化剂(命名为Cu@LAC-γ),并与LAC和LAC-γ两种催化剂进行比较。该催化剂表现出良好的电催化活性(起始电位E_(onset)=0.94 V,半波电位E_(1/2)=0.81 V),可能因为多孔的蜂窝状结构和铜纳米颗粒的协同作用加速了ORR的进行,进而表现出一种类似于Pt/C的四电子途径。

By using lake asphalt as carbon source,CuZn-ZIF as the precursors,γ-Fe_(2)O_(3) as template,get a composite precursor(named CuZn-ZIF@Lake asphat-Fe_(2)O_(3)),Cu@LAC-γis obtained by high temperature pyrolysis and comparative studied with other two kinds of LAC and LAC-γ.Depending mainly on the formation of Cu active sites and the porous cellular structure,the resultant Cu@LAC-γcatalyst exhibits best electroactivity(onset and half-wave potentials:E_(onset)=0.94 V and E_(1/2)=0.81 V)among the two kinds o f catalysts,via a 4-electron pathway similar to Pt/C.