Characterization of electrocatalytic proton reduction and surface adsorption of platinum nanoparticles supported by a polymeric stabilizer on an ITO electrode
Characterization of electrocatalytic proton reduction and surface adsorption of platinum nanoparticles supported by a polymeric stabilizer on an ITO electrode
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ITO 电极上聚合物稳定剂负载的铂纳米粒子的电催化质子还原和表面吸附表征
DOI：
10.1039/d1se01760h
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发表时间：
2022
期刊：
影响因子：
--
通讯作者：
and M. Yagi
中科院分区：
文献类型：
--
作者：
Y. Tsubonouchi;M. Kajita;M. R. Berber;Z. N. Zahran;and M. Yagi
以聚丙烯酸（PAA-Pt）为稳定剂，将铂纳米粒子从其胶体溶液中吸附到氧化铟锡（ITO）表面，利用PAA与ITO表面的化学吸附作用制备了透明的PAA-Pt纳米粒子涂层电极。与柠檬酸盐稳定的Pt纳米颗粒（柠檬酸盐-Pt）的情况相比，PAA-Pt纳米颗粒的吸附和它们的电催化质子还原进行了研究。PAA-Pt纳米粒子的吸附速度比柠檬酸盐-Pt纳米粒子快，这是由于PAA的聚合链效应使PAA-Pt纳米粒子协同吸附所致。柠檬酸盐-Pt和PAA-Pt纳米粒子之间的吸附热力学参数接近。柠檬酸-Pt和PAA-Pt纳米粒子涂层电极有效地进行电催化质子还原。尽管PAA-Pt/ITO在-1.0 V（相对于Ag/AgCl）下质子还原的质量活性（0.18 mA cm−2 nmol−1）比柠檬酸盐-Pt/ITO的质量活性（0.26 mA cm−2 nmol−1）低1.4倍，但由于PAA稳定剂的存在，PAA-Pt/ITO的催化电流非常稳定。
Platinum nanoparticles stabilized by a polymeric stabilizer of polyacrylic acid (PAA-Pt) were adsorbed on an indium tin oxide (ITO) surface from their colloidal solution due to the chemical adsorption between PAA and the ITO surface to afford a transparent PAA-Pt nanoparticle-coated electrode. The adsorption of PAA-Pt nanoparticles and their electrocatalytic proton reduction were investigated compared with the case of citrate-stabilized Pt nanoparticles (citrate-Pt). The adsorption of PAA-Pt nanoparticles is faster than that of citrate-Pt nanoparticles, ascribed to the concerted adsorption of PAA-Pt nanoparticles by the polymeric chain effect of PAA. The thermodynamic parameters for adsorption are close between citrate-Pt and PAA-Pt nanoparticles. The citrate-Pt and PAA-Pt nanoparticle-coated electrodes worked efficiently for electrocatalytic proton reduction. Although the mass activity (0.18 mA cm−2 nmol−1) of PAA-Pt/ITO for proton reduction at −1.0 V vs. Ag/AgCl was 1.4 times lower than that (0.26 mA cm−2 nmol−1) of citrate-Pt/ITO, the catalytic current for the PAA-Pt/ITO was significantly stable due to the PAA stabilizer.