Cu欠电位沉积法制备高效Pt/碳布析氢电极的研究

Preparation of High-efficient Pt/Carbon Cloth Hydrogen Evolution Electrode by Underpotential Deposition of Cu

摘要:

以阳极氧化处理的碳布（ACC） 为导电基体，利用Cu的欠电位沉积（UPD）和Cu与Pt金属前驱体之间的置换反应制备了Pt/碳布（Pt/ACC）电极材料，并对其微观结构和电催化分解水制氢性能进行了表征。结果表明，通过控制Cu的沉积电位可以有效地控制Pt的负载量和其在ACC表面的分散状态。随着沉积电位从0.32到0.15 V vs. RHE的变化，Pt/ACC电极材料中Pt的负载量呈线性增加，在0.5 MH2SO4溶液中的产氢反应结果表明，随着Pt负载量的增加，析氢起始电位逐渐降低，当沉积电位为0.15 V vs. RHE时，Pt在ACC表面的负载量仅为588 μg·cm-2，所得Pt/ACC电极材料起始电位为-0.05 V vs. RHE，且达到10 mA·cm-2电流密度所需的过电位仅为68 mV，tafel斜率为34.2 mV·dec-1，电极的催化产氢活性与块体Pt箔相近。

Abstract:

Pt/carbon cloth (Pt/ACC) electrodes were prepared via underpotential deposition of Cu in combination with replacement reaction between Cu and Pt precursor by using anodized carbon cloth (ACC) as conductive substrate. The results showed that the loading amount and dispersion of Pt could be accurately controlled by adjusting Cu deposition potential. With the variation of deposition potential from 0.32 to 0.15 V vs. RHE, the loading amount of Pt on ACC increased linearly. The results of hydrogen evolution in 0.5 MH2SO4 revealed that with the increasing in Pt loading, the onset potential for hydrogen evolution decreased gradually. When deposition potential is 0.15 V vs. RHE, the loading amount of Pt is only 588 μg·cm-2 and the obtained Pt/ACC electrode showed comparable activity to Pt foil with a onset potential of -0.05 V vs. RHE, a overpotential of 68 mV to reach a current density of 10 mA·cm-2, and tafel slope of 34.2 mV·dec-1.