Reduction Potentials of Vat Dyes and Their Relation to the Ease of Reduction and Tendering Behavior

Nabar, G. M.; Shenai, V. A.

doi:10.1177/004051756303300612

Cited by 13 publications

(4 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It is also reported that a minimum pH of 12 to 14 is necessary for dyes to be reduced and solubilized completely, supporting the use of pH 13 in the present study. 55 Thus, the effects of pH on the PG cell can be explained by these facts. The performance of the cell is poor in acidic medium.…”

Section: Effects Of Variation Of the Alkalinity Of The Electrolyte Mementioning

confidence: 96%

Simultaneous electrochemical solar power generation and storage using metanil yellow-formic acid as a new sensitizer-reductant couple in photogalvanic cells

2019

View full text Add to dashboard Cite

With the rapid commercialization of solar and wind power as supplements and potential substitutes of fossil fuels, the need for power storage techniques to render renewable energy sources impervious to climatic variations has gained significant importance recently. In addition to this requirement of power storage, photo-galvanic (PG) cells hold special significance because these photo-electrochemical devices are capable of simultaneous solar power generation and storage. PG cells with performance as high as 649.6 mW power (P pp ), 2250 mA current (i sc ), 1048 mV potential (V oc ), 8.12% conversion efficiency (CE), and 59 minutes power storage capacity (as half-time, t 0.5 ) have been reported under artificial and low illumination intensities. To enable PG cells, a future source of solar energy conversion, with storage as well, their efficiency must be improved further to a level comparable to that of photovoltaic cells. The metanil yellow dye (photo-sensitizer)-formic acid (reductant) couple has not been exploited to date for this purpose. Therefore, in the present study, the metanil yellow dye as a photosensitizer and formic acid as a reductant have been used in the presence of sodium lauryl sulfate surfactant and sodium hydroxide alkaline medium to further increase the solar energy conversion efficiency and storage capacity of PG cells. The present study reports greatly enhanced electrical performance (compared to earlier results for similar cells) of P pp 822 mW, i sc 6000 mA, V oc 1110 mV, CE 20.41%, and t 0.5 105 minutes. On the basis of the redox potential and reported data, a plausible mechanism has also been proposed for the photo-generation of current in metanil yellow-formic acid photogalvanics. ; Tel: +91 291 2614162 † Electronic supplementary information (ESI) available. See

show abstract

Section: Effects Of Variation Of the Alkalinity Of The Electrolyte Mementioning

confidence: 96%

Simultaneous electrochemical solar power generation and storage using metanil yellow-formic acid as a new sensitizer-reductant couple in photogalvanic cells

2019

View full text Add to dashboard Cite

show abstract

“…In addition, there is no correlation between the reduction potential and the reduction rate ( Table 2). Such an account of the investigation on the ease of reduction of vat dyes is reported elsewhere [14]. However, it can be seen from the results in Table 1 that substitution of hydrogen by the more electronegative bromine or chlorine diminished the reduction rate, although this shifts the potential to more positive values [15].…”

Section: Electrochemical Reduction Of Different Single Vat Dyesmentioning

confidence: 65%

Direct electrochemical reduction of vat dyes in a fixed bed of graphite granules

Roessler

Crettenand

2004

Dyes and Pigments

View full text Add to dashboard Cite

“…As the concentration of NaOH increase so does the pH of the solution. The QY being an acidic dye, is more susceptible to protonation of its sulphonic group at low pH leading to a positive charge on the dye molecules 33 . The dye protonation limits its tendency to donate electron leading to a lower current output of the cell, probable pathways have been suggested 34 …”

Section: Resultsmentioning

confidence: 99%

“…The QY being an acidic dye, is more susceptible to protonation of its sulphonic group at low pH leading to a positive charge on the dye molecules. 33 The dye protonation limits its tendency to donate electron leading to a lower current output of the cell, probable pathways have been suggested. 34 With the increase in concentration of NaOH, there is an increase in the alkalinity and a corresponding increase in pH of the solution.…”

Section: The Effect Of Variation Of Alkali (Sodium Hydroxide Naoh) Co...mentioning

confidence: 99%

Photogalvanics of Dodecyltrimethyl Ammonium Bromide‐Quinoline Yellow‐alkali: A solar energy conversion, storage, photostability, and spectral study

Jonwal

Koli

Dayma

et al. 2022

Intl J of Energy Research

View full text Add to dashboard Cite

Summary The technology to harness solar power has been evolving continuously with a recent focus on simultaneous power storage as well. Photogalvanic (PG) cell is a promising technology for simultaneous solar power and storage. The nature of the sensitizer, reductant, surfactant, and electrodes are the key factor determining the efficiency, stability, and power storage capacity of the PG cells. The use of a more stable dye with good diffusivity and conductivity realized through the most suitable surfactant has evaded the attention of researchers. Therefore, in the present study, the photogalvanics of the stable Quinoline Yellow (QY) dye photosensitizer in the presence of the Dodecyltrimethyl Ammonium Bromide (DTAB) surfactant, and Cellobiose reductant at an elevated pH has been studied for solar energy conversion and storage. The entirely novel and new photogalvanic system has shown abruptly enhanced electrical performance of the PG cell as potential 900 mV, current 10 000 μA, and power 989 μW. Encouraging photogalvanics may be attributed primarily to the greater QY dye‐DTAB surfactant interaction enhanced dye solubility, stability, and diffusion through the electrolyte. Spectrometric and conductometric study of the electrolyte has validated good photostability and conductivity of the electrolyte solution. Based on published literature and observed facts, a most plausible mechanism for the photogeneration of the current and power storage capacity has also been proposed. The present research does not introduce any new mechanism for the photo‐generation of the current, but a new and novel cell fabrication design with greatly enhanced electrical output in comparison to that in earlier studies. Novelty statement The cationic Dodecyltrimethyl Ammonium Bromide surfactant and Quinoline Yellow (QY) anionic dye sensitizer has been exploited in the presence of Cellobiose reductant for enhanced dipole‐dipole interactions for further enhancing the photogalvanics. The hypsochromic and hypochromic shift of main band of QY in electrolyte may be attributed to the QY‐DTAB complex formation due to interaction between the anionic QY dye and cationic DTAB surfactant. The present study shows abruptly enhanced electrical output (potential 900 mV, current 10 000 μA, power 989 μW).

show abstract

Reduction Potentials of Vat Dyes and Their Relation to the Ease of Reduction and Tendering Behavior

Cited by 13 publications

References 17 publications

Simultaneous electrochemical solar power generation and storage using metanil yellow-formic acid as a new sensitizer-reductant couple in photogalvanic cells

Simultaneous electrochemical solar power generation and storage using metanil yellow-formic acid as a new sensitizer-reductant couple in photogalvanic cells

Direct electrochemical reduction of vat dyes in a fixed bed of graphite granules

Photogalvanics of Dodecyltrimethyl Ammonium Bromide‐Quinoline Yellow‐alkali: A solar energy conversion, storage, photostability, and spectral study

Contact Info

Product

Resources

About