Ir和IrPd催化剂的合成及结构调控对其甲醇氧化性能的影响  

Effects of synthesis and structural regulation of Ir and IrPd catalysts on methanol oxidation performance

作　　者：周新文 沈晓宇 付策 王攀 严烙意 程征 田贵贤 张荣华 ZHOU Xinwen;SHEN Xiaoyu;FU Ce;WANG Pan;YAN Luoyi;CHENG Zheng;TIAN Guixian;ZHANG Ronghua(College of Materials and Chemical Engineering,China Three Gorges University,Yichang,Hubei 443002,China;Hubei Three Gorges Laboratory,Yichang,Hubei 443002,China)

机构地区：[1]三峡大学材料与化工学院,宜昌443002 [2]湖北三峡实验室,宜昌443002

出　　处：《无机化学学报》2024年第2期412-420,共9页Chinese Journal of Inorganic Chemistry

基　　金：国家自然科学基金(No.21403126,21503120);111计划(No.D20015)资助。

摘　　要：以三嵌段共聚物P123(聚环氧乙烷-聚环氧丙烷-聚环氧乙烷,PEO_(20)-PPO_(70)-PEO_(20))为还原剂和保护剂,比较了水热法和溶剂热法对纯Ir和IrPd合金催化剂合成及其电催化氧化甲醇(MOR)性能的影响。对于纯Ir催化剂,在相同条件下,溶剂热法能更好地促进Ir前驱体的还原。对于IrPd合金催化剂,溶剂热法可制得表面富含Ir但MOR活性较低的核壳结构产物(IrPd-S)。水热反应得到的不同原子比(IrPd、Ir2Pd、IrPd_(2))的产物粒径更小,元素分布更均匀。其中比例为1:1的IrPd(IrPd-H)催化剂的MOR电催化活性最高。上述结果表明,通过调节溶剂类型以及P123的结构诱导作用,可以有效地调节纯Ir和IrPd合金催化剂的结构、表面组成和电催化活性。Using triblock copolymer P123(poly(ethylene oxide)-poly(propylene oxide)-poly(ethylene oxide),PEO_(20)-PPO_(70)-PEO_(20))as reducing agent and protective agent,the effects of hydrothermal and solvothermal methods on the synthesis of pure Ir and IrPd alloy catalysts and their electrocatalytic oxidation of methanol(MOR)were compared.For pure Ir catalyst,solvothermal method can better promote the reduction of Ir precursor under the same conditions.For IrPd alloy catalysts,core-shell structure products(IrPd-S)with rich Ir-surface but low MOR activity can be prepared by solvothermal method.The different atomic ratios(IrPd,Ir_(2)Pd,IrPd_(2))obtained by hydrothermal reaction have smaller particle sizes and more uniform distribution of elements.Among them,IrPd catalyst with ratio of 1∶1(IrPd-H)had the highest MOR electrocatalytic activity.These results show that the structure,surface composition and electrocatalytic activity of pure Ir and IrPd alloy catalysts can be effectively adjusted by adjusting the type of solvent and the structural induction of P123.

关 键 词：结构调控 水热合成 钯铱合金 三嵌段共聚物 甲醇氧化 

分 类 号：O643.36[理学—物理化学]