Dye molecules in electrolytes: new approach for suppression of dye-desorption in dye-sensitized solar cells

Heo, Nansra; Jun, Yongseok; Park, Jae Hyung

doi:10.1038/srep01712

Cited by 51 publications

(21 citation statements)

References 29 publications

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“…Another serious issue faced by liquid electrolyte is the dye desorption from photoelectrode that occurs due to the entry of water molecules from electrolyte into the photoelectrode. The dye desorption from the photoelectrode could be suppressed by controlling the thermodynamic equilibrium, that is, by the addition of dye molecules in the electrolyte [84]. For these reasons, search for alternative redox couples broadened, for example, (SeCN) 2 /SeCN À [85], (SCN) 2 /SCN À [85], Br 3À /Br À [86], and Sn 22 /Sn [87].…”

Section: Electrolytementioning

confidence: 99%

Enhancement in the photostability of natural dyes for dye-sensitized solar cell (DSSC) applications: a review

Prabavathy

Shalini

Balasundaraprabhu

et al. 2017

Int. J. Energy Res.

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Summary The advancements in the generation of solar cells have created a landmark to design a cost‐effective, less weight, biocompatible, and environmental‐friendly solar cell. Dye‐sensitized solar cells (DSSCs) have become a topic of significant research in the recent years because of their imperative role in the zone of harvesting energy from the renewable source, and it appears to be a promising candidate for the triumph because of its low cost and ease of preparation. The use of synthetic dyes as a sensitizer for DSSC provides better efficiency and high durability. Unfortunately, they suffer from several margins such as higher cost and usage of toxic materials. These downsides have opened up for alternative sensitizer such as biocompatible natural dyes. Natural dyes contain plant pigments such as carotenoid, flavonoid, betalains, and chlorophyll that act as sensitizers (dye) for DSSC. But, the efficiency of natural dyes is not up to the mark mainly due to photoinstability of natural dye in the presence of sunlight that leads to photodegradation. The stability issues are mainly due to interaction of natural dyes with photoelectrode. The photoelectrodes in DSSC are semiconductor materials with superior characteristic of photocatalytic activity (PCA). The PCA of titanium dioxide (TiO2) generates high energetic free electrons on the surface of film that produce free radical ions in contact with moisture. These free radical ions readily degrade the organic matter present nearby (natural dye in DSSC). Thus, the PCA of photoelectrode is responsible for the photodegradation of dyes causing photoinstability. The main objective of this review is to study the photoinstability of natural dyes in DSSC. In this regard, the DSSC is concentrated into sections, and the stability issues due to PCA of photoelectrode are studied individually in the view of considering the DSSC operating with iodide‐based electrolytes and platinum as counter electrode only. Various algae groups are featured as a study tool to overview the dye interaction with photoelectrode. It highlights the application of Z‐scheme of photosynthesis to DSSC to have a broader perception on the working of DSSC and also shows some of the ways for improving the stability of dyes by suppressing or reducing the PCA of photoelectrode. Copyright © 2017 John Wiley & Sons, Ltd.

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Section: Electrolytementioning

confidence: 99%

Enhancement in the photostability of natural dyes for dye-sensitized solar cell (DSSC) applications: a review

Prabavathy

Shalini

Balasundaraprabhu

et al. 2017

Int. J. Energy Res.

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“…This may due to degradation of dye in electrolyte has made it as an electron donor to fill-up holes leaved by photoexcited electrons. Moreover, for dyesensitized TiO 2 photoelectrode, dye-added molecules in the electrolyte has reduce driving force of desorption of the dye from TiO 2 surface hence increase its stability in water [27]. …”

Section: Optical Light Absorption and Band Edge Analysismentioning

confidence: 99%

Effect of Using Pitaya Peel as Dye-Sensitizer and Dye Molecules in Electrolyte for Photoelectrochemical Reaction

Jaafar¹,

Minggu²,

Arifin³

et al. 2016

MJAS

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Natural dye sensitizer in photoelectrochemical shows a great potential in improving the efficiency of metal oxide semiconductor especially Titanium dioxide (TiO 2 ) due to its prominent in absorbing visible light and also low cost. In this work, the effect of using pitaya peel as natural dye sensitizes to TiO 2 has been studied through characterizations analysis and PEC test. The bare TiO 2 thin films were fabricated on Fluorine-doped tin oxide (FTO) glass substrate by doctor blade method meanwhile dyesensitized TiO 2 thin films prepared by immersion of TiO 2 in the dye extracts. The fabricated thin films were characterized with Scanning Electron Microscopy (SEM), X-ray difractometer (XRD), UV-Vis spectrophotometer and photoelectrochemical analysis. The surface of TiO 2 was porous and uniform meanwhile dye particles could not been observed due to very small size. The energy band gap of dye-sensitized TiO 2 from the UV-Vis spectrum is 2.1 eV which is smaller than bare TiO 2 (3.7 eV). Meanwhile, photoactivities of dye-sensitized TiO 2 has the highest compared to bare TiO 2 photoelectrodes which is 127µA/cm 2 in 6.25% v/v of pitaya dye in the electrolyte.Keywords: titanium dioxide, dye-sensitizers, betalains, photoelectrochemical cell, water splitting Abstrak Pemeka-pewarna semulajadi di dalam fotoelektromia (PEC) menunjukkan potensi yang bagus untuk meningkatkan keupayaan semikonduktor logam oksida terutamanya titanium dioksida (TiO 2 ) disebabkan kemampuannya untum menyerap cahaya nampak dan kos yang rendah. Di dalam penyelidikan ini, kesan menggunakan kulit buah naga sebagai pemeka-pewarna semulajadi terhadap TiO 2 telah dikaji melalui pencirian dan analisis fotoelektrokimia. Filem nipis TiO 2 asli telah dihasilkan melalui kaedah Doctor blade di atas kepingan kaca bersalut FTO (Stanum oksida terdop fluorin) manakala filem nipis TiO 2 dengan pewarnapemeka telah dihasilkan dengan merendam TiO 2 ke dalam larutan ekstrak pewarna. Filem nipis yang telah terbentuk telah melalui beberapa analisis pencirian iaitu, Mikroskopi Elektron Imbasan (SEM), Difraktometer Pembelauan Sinar-X (XRD), Spektrofotometer Ultralembayung dan Cahaya Nampak (UV-Vis) dan juga ujian fotoelektrokimia. Permukaan TiO 2 adalah berliang dan seragam manakala zarah pewarna tidak dapat dilihat disebabkan saiznya yang terlalu kecil. Jurang tenaga filem nipis TiO 2 dengan pewarna-pemeka adalah lebih rendah iaitu 2.1 eV jika dibandingkan dengan TiO 2 asli (3.7 eV). Manakala, fotoaktiviti bagi fotoelektrod TiO 2 dengan pewarna-pemeka adalah lebih tinggi daripada TiO 2 asli dengan 127µA/cm 2 di dalam kepekatan 6.25% v/v pewarna di dalam elektrolit. ISSN -2506 Siti Nur Hidayah et al: EFFECT OF USING PITAYA PEEL AS DYE-SENSITIZER AND DYE MOLECULES IN ELECTROLYTE FOR PHOTOELECTROCHEMICAL REACTION 652Kata kunci: titanium dioksida, pemeka-pewarna, betalain, sel fotoelektrokimia, pembelahan air Introduction The hydrogen gas production by using solar energy is deliberated as one of the most significant sustainable and clean energy technologies [1]. Photo...

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“…The DSSC device comprises a considerable thickness of photoactive metal oxide coated on a transparent photoanode substrate, redox electrolyte, and a counter electrode [24,25]. The most commonly used active materials for a DSSC are titanium dioxide (TiO 2 ) as a semiconductor, ITO as a transparent photoanode substrate, Pt as a counter electrode, Ru (II)-based dye, and an electrolyte containing the I À /I 3 À redox couple [26].…”

Section: Working Principle Of Photo-supercapacitormentioning

confidence: 99%

Potential active materials for photo-supercapacitor: A review

Lim

Hayase

et al. 2015

Journal of Power Sources

107

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Dye molecules in electrolytes: new approach for suppression of dye-desorption in dye-sensitized solar cells

Cited by 51 publications

References 29 publications

Enhancement in the photostability of natural dyes for dye-sensitized solar cell (DSSC) applications: a review

Enhancement in the photostability of natural dyes for dye-sensitized solar cell (DSSC) applications: a review

Effect of Using Pitaya Peel as Dye-Sensitizer and Dye Molecules in Electrolyte for Photoelectrochemical Reaction

Potential active materials for photo-supercapacitor: A review

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