以废弃生物质咖啡渣为碳源，通过与含铁和含氮的化合物先混合再共热解制备出一系列氧还原（ORR）催化剂。利用XRD、SEM、BET、XPS等对催化剂进行表征，并考察了其电催化性能。结果表明，铁在热解过程中能够与咖啡渣中的固有氮结合形成Fe₂N活性物质，使咖啡渣中的氮获得有效利用。同时，通过引入少量外部氮源并对焙烧条件进行优化，获得一种高氮掺杂量的催化剂CGNFe-NH₃，其在0.1 mol/L KOH中的半波电位达0.94 V。

Using coffee grounds as carbon source,a series of catalysts for oxygen reduction reaction (ORR) are prepared by co-pyrolyzing coffee grounds with the mixtures of iron and nitrogen precursors.The prepared catalysts are characterized by means of XRD,SEM,BET,XPS,etc.,and their electrocatalytic performance is studied.It is found that Fe₂N active component is formed during the pyrolysis because of Fe in the precursor combining with nitrogen inherent in coffee grounds,that is,nitrogen in coffee grounds is utilized effectively.Furthermore,a high nitrogen-doped CGNFe-NH₃ catalyst is obtained through adding a small amount of external nitrogen source and optimizing the calcination conditions,which has a half-wave potential of 0.94 V in 0.1 mol·L^-1 KOH electrolyte solution,better than commercial Pt/C catalyst.

张琳琳(1995-),女,硕士研究生,研究方向为电催化,zll992529505@163.com