高活性、低载量的PtCo/C质子交换膜燃料电池催化剂的合成

Synthesis of High-Performance and Low-Loading PtCo/C Proton Exchange Membrane Fuel Cell Catalysts

利用逐步合成的方法,合成了一系列不同量硝酸处理的PtCo/C催化剂。通过燃料电池测试装置对催化剂进行了测试,结果表明PtCo/C催化剂在较低载量情况下,有着很好的性能:在50 kPa背压下,0.9 V下的电流密度达到44 mA·cm^(-2),0.8 V下的电流密度超过300 mA·cm^(-2);200 kPa背压下,最高功率密度超过1300 mW·cm^(-2)。通过X射线衍射(XRD)、透射电子显微镜(TEM)对合成的PtCo/C催化剂的形貌、组成进行了表征。XRD结果表明,催化剂中,Pt以Pt3Co和Pt颗粒形式存在。燃料电池测试结果表明,这一系列的催化剂中,经2 mL质量分数65%的浓硝酸配制的水溶液处理过的PtCo/C催化剂,具有最好的燃料电池性能以及良好的稳定性。

A series of PtCo/C catalysts etched with different amounts of nitric acid were synthesized by stepwise synthesis.Tested by fuel cell test device,PtCo/C catalysts showed good performance at the condition of low loading.Under 50 kPa back pressure,the current density at 0.9 V reached 44 mA·cm^(-2) and the current density at 0.8 V exceeded 300 mA·cm^(-2).Under 200 kPa back pressure,the highest power density exceeded 1300 mW·cm^(-2).The morphology and structure of PtCo/C catalysts were characterized by X-ray diffraction(XRD)and transmission electron microscope(TEM).XRD patterns show that Pt mainly exists in the form of Pt3Co and Pt nanoparticles.The fuel cell test data show that among the series of catalysts,PtCo/C catalysts treated with aqueous solution prepared with 2 mL nitric acid(mass ratio of 65%)has the best fuel cell performance.