燃料电池铂钴锰合金催化剂的制备及性能

为提高PtCo/C合金催化剂的电化学性能,采用微波法合成铂钴锰催化剂前驱体,经高温热处理形成合金,最后通过酸处理得到铂钴锰合金催化剂(PtCoMn/C)。电化学测试结果表明:适量锰的添加可提升PtCo/C催化剂的活性和耐久性。PtCo Mn/C催化剂在0.9 V(vs RHE)电压下的质量比活性(MA)达到0.666 A·mg_Pt^-1,是传统Pt/C的2.66倍,是PtCo/C催化剂的1.30倍。在30 000圈催化剂加速耐久性测试中,PtCoMn/C合金催化剂的电化学活性面积(ECSA)和质量比活性(MA)仅下降6.9%和27.1%,均远低于Pt/C催化剂。

Preparation and properties of platinum-cobalt-manganese alloy catalysts for fuel cells

The precursor of PtCoMn alloy catalyst was synthesized with ethylene glycol as reducing agent under microwave heating. After high temperature heat treatment, the alloy was formed. Finally, the PtCoMn alloy catalyst was obtained by acid treatment. The composition, structure, and morphology of the catalyst were characterized by elemental analysis, X-ray diffraction, and transmission electron microscopy. The surface electronic structure and properties of the catalyst were studied by X-ray photoelectron spectroscopy and electrochemical workstation. The results showed that the activity and durability of the catalyst can be improved by the addition of proper amount of Mn. The mass specific activity (MA) of PtCoMn/C catalyst was 0.666 A·mg_Pt^-1 at 0.9 V (vs RHE), which was 2.66 times that of conventional Pt/C and 1.30 times that of PtCo/C catalyst. In the 30 000-cycle catalyst accelerated durability test, electrochemical active area (ECSA) and MA of PtCoMn/C alloy catalyst only decreased by 6.9% and 27.1%, both of which were much lower than Pt/C catalyst.