主盐浓度对Au-Pt合金催化剂性能的影响

Au-Pt纳米微粒对氧气的还原与析出反应具有高效的催化活性,可以作为锂空气电池的正极催化材料。在碳纸上恒流电沉积Au-Pt合金,并研究了主盐浓度对Au-Pt合金的微观形貌、组成及性能的影响。结果表明:在氯金酸8mmol/L、氯铂酸12mmol/L、硫酸0.5mol/L、电流密度20mA/cm~2、时间25s的条件下,可获得粒径约为200nm的Au_(0.5)Pt_(0.5)纳米微粒,其在离子液体电解液中对氧气的催化活性较高。用该工艺条件下制备的空气电极所组装的锂空气电池的放电平台约为2V,在600mA/g条件下可定容循环13次。

Effect of Concentration of Main Salts on the Properties of Au-Pt Alloy Catalysts

Au-Pt nano-particle has high catalytic ability on oxygen reduction reactions (ORR)and oxygen evolution reactions (OER),which can be used as cathodic materials in lithium-air batteries.Au-Pt alloys were electrodeposited on carbon paper,and the effect of concentration of main salts on the micro-structure,compositions and properties of Au-Pt alloys were studied.Results showed that,under the conditions of HAuC14 8 mmol/L,H2PtC16 12 mmol/L,H2SO4 0.5 mol/L,current density 20 mA/cm2 and time 25 s,Au0.5 Pt0.5 nano-particle which diameter was about 200 nm and with high catalytic abilities on ORR and OER in ionic liquid electrolyte can be ontained.The lithium-air battery assembled with the air electrode prepared by the above process possessed a discharge and charge platform of appropriately 2 V,and retained a dischargecharge capacity of 600 mA/g within 13 cycles.