生物质碳基非贵金属ORR催化剂的制备及其性能研究

Preparation of carbon-based non-precious metal ORR catalysts from biomass waste and study on their performance

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Fe_(2)N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-NH_(3),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 Fe_(2)N 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-NH_(3) 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.