CAJ | 학술논문

采用浸渍还原法制备Pt-Ru/C催化剂,选用不同的有机组分(如乙醇、异丙醇、四氢呋喃和乙二醇)组成浸渍溶液.这些有机组分与前驱体(PtCl_6~(2-)和Ru~(3+)离子)形成的配合物空间位阻的不同,直接影响前驱体在载体表面的吸附状况和还原电位,进而影响粒子尺寸、晶体结构和Pt-Ru/C催化剂的性能.实验表明,采用等体积比的乙二醇和水混合溶剂制备的Pt-Ru/C催化剂,透射电镜测试Pt-Ru粒子的平均粒径为2.7 nm,且粒径分布均匀;X射线衍射分析表明,Pt-Ru粒子相对结晶度低(I_(Pt)/I_(C)=1.67),合金化程度较高(Pt-Ru合金中Ru原子分数为0.471).在0.5 mol/L H_2SO_4和0.5 mol/L CH_3OH混合溶液中的循环伏安测试表明,所制备的Pt-Ru/C具有良好的催化活性和抗CO中毒能力.
채용침지환원법제비Pt-Ru/C최화제,선용불동적유궤조분(여을순、이병순、사경부남화을이순)조성침지용액.저사유궤조분여전구체(PtCl_6~(2-)화Ru~(3+)리자)형성적배합물공간위조적불동,직접영향전구체재재체표면적흡부상황화환원전위,진이영향입자척촌、정체결구화Pt-Ru/C최화제적성능.실험표명,채용등체적비적을이순화수혼합용제제비적Pt-Ru/C최화제,투사전경측시Pt-Ru입자적평균립경위2.7 nm,차립경분포균균;X사선연사분석표명,Pt-Ru입자상대결정도저(I_(Pt)/I_(C)=1.67),합금화정도교고(Pt-Ru합금중Ru원자분수위0.471).재0.5 mol/L H_2SO_4화0.5 mol/L CH_3OH혼합용액중적순배복안측시표명,소제비적Pt-Ru/C구유량호적최화활성화항CO중독능력.
Pt-Ru/C catalysts have been prepared by impregnation-reduction method with various organic solvents, such as ethanol, isopropanol, tetrahydrofuran(THF) and glycol, as the impregnating solution. The steric hindrance of complexes formed from precursors (PtCl_6~(2-) and Ru~(3+) ions) and the organic solvents had direct impact on the adsorption on carbon black supports and the reduction potential values of precursors, which affected the particle size, crystal structure and the performance of Pt-Ru/C electrocatalysts. Experiment results show that Pt-Ru/C catalyst prepared from mixed solvent of glycol and water with a ratio of 1∶1 by volume has an even distribution of particle size and the average size of Pt-Ru particles is 2.7 nm by transmission electron microscopy (TEM). X-ray diffraction (XRD) analysis indicates a low relative crystallinity (I_(Pt)/I_C=1.67) and a high alloying degree for the Pt-Ru/C catalyst (Ru atom fraction in Pt-Ru alloy is 0.471). Cyclic voltammetry measurement results of the prepared Pt-Ru/C catalyst in 0.5 mol/L H_2SO_4 and 0.5 mol/L CH_3OH show good electrocatalytic performance and tolerance to CO of the catalyst.