CAJ | 학술논문

以碳黑（Vulcan XC 72）为载体,氯铱酸（H2IrCl6.6H2O）和氯铂酸（H2PtCl6.6H2O）为前驱体,聚乙烯基吡咯烷酮（PVP,polyvinylpyrrolidone）为保护剂,首次采用高压氢还原方法制备出PtIr/C合金催化剂,并对其进行不同温度的通H2热处理。运用XRD、TEM和XPS对PtIr/C合金催化剂进行表征。结果表明,Pt与Ir发生合金化,PtIr合金纳米粒子均匀分散在碳黑表面。经400和700℃热处理后,PtIr合金纳米粒子的平均粒径仅从4.46nm长大至4.56和5.58nm,且随着热处理温度的升高,其晶型不断完善。用CO-stripping伏安法,循环伏安法（CV）、计时电流法（CA）等电化学测试方法测试PtIr/C合金催化剂的电催化性能,发现400℃热处理的PtIr/C合金催化剂,在酸性溶液中对CO氧化的起始电位明显提前,对甲醇氧化具有最高的催化活性。
이탄흑（Vulcan XC 72）위재체,록의산（H2IrCl6.6H2O）화록박산（H2PtCl6.6H2O）위전구체,취을희기필각완동（PVP,polyvinylpyrrolidone）위보호제,수차채용고압경환원방법제비출PtIr/C합금최화제,병대기진행불동온도적통H2열처리。운용XRD、TEM화XPS대PtIr/C합금최화제진행표정。결과표명,Pt여Ir발생합금화,PtIr합금납미입자균균분산재탄흑표면。경400화700℃열처리후,PtIr합금납미입자적평균립경부종4.46nm장대지4.56화5.58nm,차수착열처리온도적승고,기정형불단완선。용CO-stripping복안법,순배복안법（CV）、계시전류법（CA）등전화학측시방법측시PtIr/C합금최화제적전최화성능,발현400℃열처리적PtIr/C합금최화제,재산성용액중대CO양화적기시전위명현제전,대갑순양화구유최고적최화활성。
For the first time, Ptlr/C alloying catalysts were synthesized by high-pressure hydrogen reduction method using H2IrC16 · 6H20 and H2PtC16 · 6H20 as Ir and Pt precursors, polyvinylpyrrolidone as dispersing agent, in ethylene glycol solution, then further heat treated at different temperatures in H2 gas. The PtIr/C alloying catalysts were characterized by X-ray diffraction （XRD）, transmission electron microscopy （TEM） and X-ray photoelectron spectroscopy （XPS）. The results revealed that the PtIr nanoparticles were alloying catalysts, the metal particles were good dispersed on the caubon surface. After heat treated at 400 and 700°C, the mean particle sizes of PtIr nanoparticles just increased from 4.46 to 4.56 and 5.58nm, and with the increasing at heat treatment temperature, the crystal structure of PtIr alloying nanoparticles improved. CO-stripping voltammetry, cyclic voltammetry （CV） and chronoamperometry （CA） were used to characterize the catalytic performance of PtIr/C alloying catalysts toward CO and methanol electro-oxidation. PtIr/C catalysts had a lower oxidation starting potential towards CO oxidation in acid Solution and a better catalytic activity towards methanol oxidation.