期刊
ANALYTICAL CHEMISTRY
卷 86, 期 21, 页码 10660-10667出版社
AMER CHEMICAL SOC
DOI: 10.1021/ac502517b
关键词
-
资金
- National Science Foundation Graduate Research Fellowship Program [DGE-1144245]
- Joint Center for Energy Storage Research, an Energy Innovation Hub - U.S. Department of Energy, Office of Science, Basic Energy Sciences
- UIUC
We report on the quantitative, spatially resolved study of ionic processes for energy materials in nonaqueous environments by in situ electrochemical means at the micro- and nanoscale. Mercury-capped platinum ultramicroelectrodes (Hg/Pt UMEs) were tested as probes for alkali ions in propylene carbonate (PC) in an oxygen- and water-free environment. Anodic stripping voltammetry (ASV) performed at Hg/Pt UMEs displayed a linear response to Li+ concentration extending from 20 mu M to at least 5 mM. The sensitivities of these probes for ionic lithium are 1.93 and -23.2 pA mu M-1 by the steady-state amalgamation current and the peak stripping current, respectively. These values showed excellent agreement with simulated results as well as to those obtained experimentally for Cd2+ in H2O. We further explored the interfacial imaging of lithium ion flux at an electrified interface. Scanning electrochemical microscopy (SECM) using Hg/Pt UMEs showed that the steady-state amalgamation of ionic lithium could be used to reliably position a probe close to a substrate. Investigations on a selectively insulated gold electrode in an organic solvent system showcased the response of Hg/Pt UMEs to lithium uptake by an electroactive material. Additionally, lithium stripping voltammetry at Hg deposits on a 120 nm carbon nanoelectrode demonstrated the possibility of implementing the introduced imaging strategy at the nanoscale. This work opens a way to directly correlate material defects and reactive heterogeneity in energy materials with unprecedented spatial and temporal resolution.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据