高氧还原稳定性的非金属掺杂Pt基催化剂制备及其稳定机理研究

Preparation of Non-Metallic Doped Pt-Based Catalysts with High Oxygen Reduction Stability and Its Stabilization Mechanism

近年来,阴极催化剂较低的氧还原稳定性已成为限制质子交换膜燃料电池实际应用与发展的瓶颈。文章以尿素和氯铂酸钾为前驱体,通过简单的无表面活性剂合成方法,得到一种非金属N掺杂的Pt纳米颗粒。物理表征结果清楚地显示了N在Pt晶格内的掺杂导致了Pt纳米粒子的拉伸应变,电化学测试结果表明,这种N掺杂的Pt纳米催化剂具有高的氧还原活性与稳定性,其20000圈循环加速测试后活性衰减仅为商业化Pt/C的14.4%。实验结果表明,通过该合成方法制备的N掺杂的Pt纳米粒子为燃料电池催化剂的实际运用提供了广阔前景。。

In recent years,the low oxygen reduction stability of cathode catalysts has become a bottleneck limiting the practical application and development of Proton Exchange Membrane Fuel Cells(PEMFCs).In the paper,a non-metallic N-doped Pt nanoparticle was obtained by a simple surfactant-free synthesis method using urea and potassium chloroplatinate as precursors.The physical characterization results clearly show that the doping of N within the Pt lattice leads to the tensile strain of Pt nanoparticles,and the electrochemical test results indicate that this N-doped Pt nanocatalyst has high oxygen reduction activity and stability,and its activity decay after 20,000 cycles of accelerated testing is only 14.4%of that of commercial Pt/C.The experimental results indicate that the N-doped Pt nanoparticles prepared by this synthetic method offer a promising future for the practical application of fuel cell catalysts.