碳载Pt-P催化剂对氧还原的电催化性能

用NaH2PO2液相还原方法制得碳载Pt-P(Pt-P/C)催化剂(m(Pt)∶m(P)=5∶1)。 X射线衍射谱测量表明，Pt-P/C催化剂的Pt衍射峰的2θ值稍大于Pt/C催化剂的相应值，表明P进入了Pt晶格，形成了Pt-P合金。 电化学测试表明,Pt-P/C催化剂对氧还原的电催化性能要比商品化的E-TEK Pt/C催化剂好，其还原电位正移了40 mV。 由于Pt-P/C催化剂中Pt-P粒子的平均粒径和相对结晶度与Pt/C催化剂相似，推测Pt-P/C催化剂对氧还原的电催化性能好于Pt/C催化剂的原因可能为P的作用。

Electrocatalytic Performance of the Carbon-Supported Pt-P Catalyst for Oxygen Reduction

The carbon supported Pt-P(Pt-P/C) catalyst(m(Pt)∶m(P)=5∶1) was prepared with NaH2PO2 reduction method. The X-ray diffraction results indicate that the 2θ values of the Pt diffraction peaks of the Pt-P/C catalyst are slightly greater than those of the Pt/C catalyst, illustrating that P has entered into the crystal lattice of Pt and forms the Pt-P alloy. The electrochemical measurements demonstrated that the electrocatalytic performance of the Pt-P/C catalyst for the oxygen reduction is better than that of the commercial E-TEK Pt/C catalyst with 40 mV positive shift of reduction potential, which may be attributed to the P action because the average size and the relative crystallinity of the Pt-P particles in the Pt-P/C catalyst are similar to those in Pt/C catalyst.