PDF Publication Title:
Text from PDF Page: 128
batches of water (also purged with nitrogen before being placed in the glove box) and reconstructed to a symmetric one-container configuration with the 50 mL DHAQ/DHAHQ mixture. A 50mL glass bottle fitted with a 4-port HPLC cap was used as pulsation dampener. The setup was initially conditioned by recirculating the DHAQ/DHAHQ electrolyte at 50 mL min−1 for 1 h. The impedance was subsequently recorded on a BioLogic VSP-300 potentiostat from 200 kHz to 50 mHz in three successive repetitions to assess the stability of the system. These spectra are presented in Figure 6.20 (a). The impedance response above 1Hz was unusually noisy, as seen from both the Nyquist plots in Figure 6.20 (a) and the Kramers-Kronig residuals of the third spectrum in Figure 6.20 (b). This was presumably caused by the extra connection between the potentiostat and the cell, first through pins on the outer and inner wall of the glove box and then with a different type of cable to the cell. The impedance response below 1 Hz was stable over the three repetitions. Figure 6.20: (a) Nyquist plots recorded on a one-container symmetric cell containing 0.05 M DHAQ+0.05 M DHAHQ dissolved in 1.2 M KOH (= 1.0 M OH – ). The impedance was recorded from 200kHz to 50mHz at an electrolyte flow rate of 50mLmin−1 and at room temperature in three successive measurements. (b) Kramers-Kronig residuals of the third spectrum in (a). (c) Average of the Nyquist plots presented in (a). (d) Kramers- Kronig residuals of the average Nyquist plot in (c). In order to reduce the noise and to obtain a spectrum better suited for the CNLS fitting procedure, several spectra were recorded at each of the applied flow rates to compute an average spectrum. The procedure is exemplified in Figure 6.20 (c) for spectra recorded at 50mLmin−1. The results from the Kramers-Kronig test are shown in Figure 6.20 (d) and show some reduction in residuals compared to Figure 6.20 (b). The impedance was subsequently recorded from 200 kHz to 20 mHz on a BioLogic VSP- 300 potentiostat at electrolyte flow rates ranging from 10–90 mL min−1 in increments of 20mLmin−1. At each flow rate, six successive spectra were recorded to ensure the impedance was stable. The spectra presented in Figure 6.21 are an average of the last 6.2. Results and Discussion 107PDF Image | Organic Redox Flow Batteries 2023
PDF Search Title:
Organic Redox Flow Batteries 2023Original File Name Searched:
PhD_thesis_final_dorhoff_4_.pdfDIY PDF Search: Google It | Yahoo | Bing
Salgenx Redox Flow Battery Technology: Salt water flow battery technology with low cost and great energy density that can be used for power storage and thermal storage. Let us de-risk your production using our license. Our aqueous flow battery is less cost than Tesla Megapack and available faster. Redox flow battery. No membrane needed like with Vanadium, or Bromine. Salgenx flow battery
CONTACT TEL: 608-238-6001 Email: greg@salgenx.com (Standard Web Page)