文献类型：期刊文献

英文题名：Confined Electrochemical Behaviors of Single Platinum Nanoparticles Revealing Ultrahigh Density of Gas Molecules inside a Nanobubble

作者：Sun, Zehui[1,2];Gu, Zhihao[1,2];Ma, Wei[1,2]

机构：[1]East China Univ Sci & Technol, Key Lab Adv Mat, Shanghai 200237, Peoples R China;[2]East China Univ Sci & Technol, Feringa Nobel Prize Scientist Joint Res Ctr, Frontiers Sci Ctr Materiobiol & Dynam Chem, Sch Chem & Mol Engn,Joint Int Res Lab Precis Chem, Shanghai 200237, Peoples R China

年份：2023

卷号：95

期号：7

起止页码：3613

外文期刊名：ANALYTICAL CHEMISTRY

收录：;EI(收录号：20230713599859);WOS:【SCI-EXPANDED(收录号:WOS:000933859300001)】；

基金：This research was supported by the Major Research Project (92061108), the National Natural Science Foundation of China (22272052), the Shanghai Municipal Science and Technology Major Project (2018SHZDZX03), and the Xiamen University Opening Project of PCOSS (201901).

语种：英文

外文关键词：Carbon fibers - Chlorine compounds - Density of gases - Gases - Microelectrodes - Nanoparticles - Oxygen - Platinum - Platinum compounds - Stochastic systems

摘要：Understanding the basic physicochemical properties of gas molecules confined within nanobubbles is of fundamental importance for chemical and biological processes. Here, we successfully monitored the nanobubble-confined electrochemical behaviors of single platinum nanoparticles (PtNPs) at a carbon fiber ultramicroelectrode in HClO4 and H2O2 solution. Due to the catalytic decomposition of H2O2, a single oxygen nanobubble was formed on individual PtNPs to block the active surface of particles for proton reduction and to suppress their stochastic motion, resulting in significantly distinguished current traces. Furthermore, the combination of theoretical calculations and high resolution electrochemical measurements allowed the nanobubble size and the oxygen gas density inside a single nanobubble to be quantified. Moreover, the ultrahigh oxygen density inside (1046 kg/m3) was revealed, indicating that gas molecules in a nanosized space existed with a high state of aggregation. Our approach sheds light on the gas aggregation behaviors of nanoscale bubbles using single-entity electrochemical measurements.