PDF Publication Title:
Text from PDF Page: 003
Figure 1. (a) Cyclic voltammetry (CV) of 10mM NaClO2 on a glassy carbon electrode (GCE, 3mm dia.) at a scan rate of 100 mV/sec. All curves are from the third CV cycle. The supporting electrolyte in the alkaline solution is 1M KOH (about pH 14). The supporting electrolyte in a near-neutral solution is 1M NaCl. The supporting electrolyte in the acidic solution is 0.5M Na2SO4 + 9mM H2SO4 (about pH 2). The arrows in the figure indicate the scan direction. The increase in current at higher potential is attributed to the oxygen evolution reaction (OER). (b) CV for 10mM NaClO2 on a glassy carbon electrode (GCE, 3mm dia.) in 1M NaCl electrolyte at different scan rates. (c) Randles – Sevcik analysis based on data from Fig. 1b. All CV experiments were performed at room temperature (19°C +/- 1°C) with a Ag/AgCl (3M NaCl) reference electrode and a platinum wire counter electrode. (d) CV of 10mM NaClO2 in 1M KOH solution using a glassy carbon electrode (3mm dia.) at a scan rate of 100 mV/sec in a water- jacketed glass cell. Results measured at 5°C and 20°C are shown. The cell temperature was controlled by circulating water held at the temperature of interest. A mercury / mercury oxide (MMO) filled with 1M KOH reference electrode and platinum wire counter electrode were used in the cell. See supporting information for the cell setup. If, as proposed, the half-cell reaction involves electron transfer only, the reaction should occur at an equilibrium potential that is independent of pH. Figure 1a compares CV curves taken at the same temperature and sweep rate for acidic, near-neutral, and alkaline solutions spanning pH 2 to 14, showing that this is the case. The equilibrium potentials are all within 10 mV of the expected potential of 0.954V (vs SHE) [7], assuming the standard electrode potential of Ag/AgCl 3M NaCl is 209 mV vs SHE. If protons were to be involved in the reaction, a potential shift of 59mV per pH unit is expected for a 1- electron transfer process. A pH shift is indeed seen for the oxygen evolution reaction (OER), which occurs at a lower potential (at ~0.9V vs Ag/AgCl) in the alkaline CV curve than in the neutral or acidic condition in Fig. 1a. These results also show the clear separation in potential between ClO2/ClO2- redox 3PDF Image | Reversible Chlorite Chlorine Dioxide Anion Redox Storage
PDF Search Title:
Reversible Chlorite Chlorine Dioxide Anion Redox StorageOriginal File Name Searched:
reversible-chlorite-chlorine-redox.pdfDIY PDF Search: Google It | Yahoo | Bing
Salgenx Redox Flow Battery Technology: Power up your energy storage game with Salgenx Salt Water Battery. With its advanced technology, the flow battery provides reliable, scalable, and sustainable energy storage for utility-scale projects. Upgrade to a Salgenx flow battery today and take control of your energy future.
CONTACT TEL: 608-238-6001 Email: greg@salgenx.com (Standard Web Page)