Full metadata record
DC Field | Value | Language |
---|---|---|
dc.contributor.author | 장진호 | - |
dc.date.accessioned | 2019-12-08T01:18:13Z | - |
dc.date.available | 2019-12-08T01:18:13Z | - |
dc.date.issued | 2018-05 | - |
dc.identifier.citation | JOURNAL OF THE ELECTROCHEMICAL SOCIETY, v. 165, no. 7, page. H407-H416 | en_US |
dc.identifier.issn | 0013-4651 | - |
dc.identifier.issn | 1945-7111 | - |
dc.identifier.uri | http://jes.ecsdl.org/content/165/7/H407 | - |
dc.identifier.uri | https://repository.hanyang.ac.kr/handle/20.500.11754/118606 | - |
dc.description.abstract | In this article, we account for the reduction pathway of quaternary ammonium polybromide (QBr(2n +/- 1)) droplets on Pt ultramicroelectrode (UME). In previous work, we electrochemically analyzed stochastic current spikes from Br -electrolysis in QBr(2n +/- 1) droplets by their particle impact on Pt UME. For electro-reduction of QBr 2n +/- 1 droplets through chronoamperometry, we found no evidence of stochastic current spikes, which are supposed to be evidence for direct electro-reduction (DR) of QBr(2n +/- 1) droplets to Br- and Q(+) through their particle impact on Pt UME. Instead, we suggest an indirect electro-reduction (IDR) mechanism for QBr(3) droplets via the following pathway based on a finite element analysis. The electrochemically generated QBr(3) droplets are mostly distributed in the vicinity of Pt UME within our experimental time scale due to their sizes. QBr(3) equilibrated with Q(+) and Bra(-) and the liberated Br3(-) from QBr(3) droplets are electrochemically reduced to Br until all the QBr(3) droplets in the vicinity of the Pt UME are depleted. We further found that QBr(2n +/- 1) species (n = 2 and 3) are not electro-reduced through IDR but are precipitated on Pt UME. In the chronoamperogram at each forward step of the fifty potential cycles, CA(forward-50 cycles), the potential was applied for 0.4 s where Br is oxidized on the Pt UME in an acidic solution containing QBr. In the CA(forward-50 cycles), the current spikes attributed to Br- -electrolysis in QBr(2n +/- 1) droplets by their particle-impact on Pt UME were observed. In the CA(reverse-50 cycles), the potential was applied for another 0.4 s, which is enough to drive the electro-reduction of Br3(-) on Pt UME. The frequency of the current spikes in the CA(forward-50 cycles) significantly declined as the potential-cycles increased. The chronoamperometric analyses indicated that the Pt surface is partially blocked by the reduction-inactive QBr(2n +/- 1 )species, which was confirmed to be mostly QBr(5) and QBr(7) by Raman spectroscopy. (C) 2018 The Electrochemical Society. | en_US |
dc.description.sponsorship | This research was supported by the Basic Science Research Program (2015R1C1A1A01052368) and the Bio & Medical Technology Development Program (2017M3A9G8084539) through the National Research Foundation of Korea (NRF) funded by Ministry of Science and ICT. This work was also supported by the research fund of Hanyang University (HY-2018). We also thank Dr. Hyun S. Park for the preparation of a thin film Pt macroelectrode and Professor Junghyun Chae for the synthesis of MEPBr and EPyBr. | en_US |
dc.language.iso | en_US | en_US |
dc.publisher | ELECTROCHEMICAL SOC INC | en_US |
dc.subject | POTENTIAL SWEEP VOLTAMMETRY | en_US |
dc.subject | BROMINE COMPLEXING AGENTS | en_US |
dc.subject | ZINC-FLOW BATTERY | en_US |
dc.subject | ELECTROCHEMICAL GENERATION | en_US |
dc.subject | EMULSION DROPLETS | en_US |
dc.subject | CARBON ELECTRODES | en_US |
dc.subject | ULTRAMICROELECTRODE | en_US |
dc.subject | ELECTROOXIDATION | en_US |
dc.subject | STORAGE | en_US |
dc.subject | CELLS | en_US |
dc.title | Revealing Indirect Electro-Reduction of Quaternary Ammonium Polybromide Droplets in Acidic Aqueous Solutions | en_US |
dc.type | Article | en_US |
dc.relation.no | 7 | - |
dc.relation.volume | 165 | - |
dc.identifier.doi | 10.1149/2.1171807jes | - |
dc.relation.page | 407-416 | - |
dc.relation.journal | JOURNAL OF THE ELECTROCHEMICAL SOCIETY | - |
dc.contributor.googleauthor | Hwang, Jiseon | - |
dc.contributor.googleauthor | Chang, Jinho | - |
dc.relation.code | 2018002545 | - |
dc.sector.campus | S | - |
dc.sector.daehak | COLLEGE OF NATURAL SCIENCES[S] | - |
dc.sector.department | DEPARTMENT OF CHEMISTRY | - |
dc.identifier.pid | jhcechem | - |
dc.identifier.orcid | https://orcid.org/0000-0002-5572-2364 | - |
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