Electrocatalytic sulfur electrodes for CdS/CdSe quantum dot-sensitized solar cells

Yang, Zusing; Chen, Chia-Ying; Liu, Chen‐Wuing; Chang, Huan‐Tsung

doi:10.1039/c0cc00642d

Cited by 276 publications

(231 citation statements)

References 32 publications

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“…[ 16,17 ] However, photo-corrosion and high charge-transfer resistance ( R ct ) often occur at the interface of counter electrode/electrolyte in QDSSCs, leading to low fi ll factors (FF, < 50%) and limited η values ( < 4%). [ 17 ] Relative to CoS electrodes, CuS electrodes provide higher conductivity and electrocatalytic activity and lower R ct , but shorter lifetimes because of sulfur corrosion. In this study, we employed CuS/CoS counter electrodes to fabricate CdS/ CdSe QDSSCs.…”

Section: Introductionmentioning

confidence: 99%

Quantum Dot–Sensitized Solar Cells Featuring CuS/CoS Electrodes Provide 4.1% Efficiency

Yang

Chen

Liu

et al. 2011

Advanced Energy Materials

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CuS, CoS, and CuS/CoS onto fl uorine-doped tin oxide glass substrates were deposited to function as counter electrodes for polysulfi de redox reactions in CdS/CdSe quantum dot-sensitized solar cells (QDSSCs). Relative to a Pt electrode, the CuS, CoS, and CuS/CoS electrodes provide greater electrocatalytic activity, higher refl ectivity, and lower charge-transfer resistance. Measurements of fi ll factor and short-current density reveal that the electrocatalytic activities, refl ectivity, and internal resistance of counter electrodes play strong roles in determining the energy-conversion effi ciency ( η ) of the QDSSCs. Because the CuS/CoS electrode has a smaller internal resistance and higher refl ectivity relative to those of the CuS and CoS electrodes, it exhibits a higher fi ll factor and short-circuit current density. As a result, the QDSSC featuring a CuS/CoS electrode provides a higher value of η . Under illumination of one sun (100 mW cm − 2 ), the QDSSCs incorporating Pt, CuS, CoS, and CuS/CoS counter electrodes provide values of η of 3.0 ± 0.1, 3.3 ± 0.3, 3.8 ± 0.2, and 4.1 ± 0.2%, respectively.

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Section: Introductionmentioning

confidence: 99%

Quantum Dot–Sensitized Solar Cells Featuring CuS/CoS Electrodes Provide 4.1% Efficiency

Yang

Chen

Liu

et al. 2011

Advanced Energy Materials

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251

139

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“…A repetitive dry method was used to prepare the TiO 2 electrodes [21]. In brief, TiO 2 paste was prepared by mixing TiO 2 powder (after HNO 3 treatment; 0.6 g), PVP (0.18 g), methyl cellulose (0.06 g), and ultrapure H 2 O (3 mL).…”

Section: Preparation Of Tio 2 Electrodesmentioning

confidence: 99%

“…Therefore, to fabricate highly efficient PECs for water splitting, we prepared TiO 2 /CdZnS/CdZnSe electrodes from 2 Journal of Materials Cd(NO 3 ) 2 , ZnSO 4 , Na 2 S, and Na 2 SeSO 3 via chemical bath deposition (CBD) approach [21]. Under AM 1.5 illumination (100 mW cm −2 ) and in presence of a sacrificial electrolyte (2 M Na 2 S and 0.25 M Na 2 SO 3 ), the three as-prepared TiO 2 /CdZnS/CdZnSe electrodes provided of 7.3 ± 0.1%.…”

Section: Introductionmentioning

confidence: 99%

High-Efficiency Photochemical Water Splitting of CdZnS/CdZnSe Nanostructures

Wang

Yang

Periasamy

2013

Journal of Materials

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We have prepared and employed TiO 2 /CdZnS/CdZnSe electrodes for photochemical water splitting. The TiO 2 /CdZnS/CdZnSe electrodes consisting of sheet-like CdZnS/CdZnSe nanostructures (8-10 m in length and 5-8 nm in width) were prepared through chemical bath deposition on TiO 2 substrates. The TiO 2 /CdZnS/CdZnSe electrodes have light absorption over the wavelength 400-700 nm and a band gap of 1.87 eV. Upon one sun illumination of 100 mW cm −2 , the TiO 2 /CdZnS/CdZnSe electrodes provide a significant photocurrent density of 9.7 mA cm −2 at −0.9 V versus a saturated calomel electrode (SCE). Incident photon-tocurrent conversion efficiency (IPCE) spectrum of the electrodes displays a maximum IPCE value of 80% at 500 nm. Moreover, the TiO 2 /CdZnS/CdZnSe electrodes prepared from three different batches provide a remarkable photon-to-hydrogen efficiency of 7.3 ± 0.1% (the rate of the photocatalytically produced H 2 by water splitting is about 172.8 mmol⋅h −1 ⋅g −1 ), which is the most efficient quantum-dots-based photocatalysts used in solar water splitting.

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“…Thereby it aggravates the back electron transfer at the photoanode and increases the charge recombination at the semiconductor/electrolyte interface, leading to the loss of V oc . To overcome the limitations of the conventional CEs, alternative catalytic materials have been exploited for the reduction of S n 2-species, for example, CoS, CoS 2 , CuS, Cu 2 S, PbS, MoS 2 , Cu 2 ZnSnS 4 and carbon materials [42,[45][46][47][48][49][50][51][52][53][54]. Among these candidates, Cu 2 S CEs that are normally fabricated by exposing the brass sheets to sulfide solution [34,41] exhibit relatively higher electrocatalytic activity in reducing polysulfide species.…”

Section: Introductionmentioning

confidence: 99%

Boosting the efficiency of quantum dot sensitized solar cells up to 7.11% through simultaneous engineering of photocathode and photoanode

et al. 2015

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L. (2015). Boosting the efficiency of quantum dot sensitized solar cells up to 7.11% through simultaneous engineering of photocathode and photoanode. Nano Energy, 13 609-619.Boosting the efficiency of quantum dot sensitized solar cells up to 7.11% through simultaneous engineering of photocathode and photoanode AbstractWe demonstrate a new strategy of boosting the efficiency of quantum dot sensitized solar cells (QDSSCs) by engineering the photocathode and photoanode simultaneously. Nanostructured photocathodes based on non-stoichiometric Cu 2-x Se electrocatalysts were developed via a simple and scalable approach for CdS/CdSe QDs co-sensitized solar cells. Compared to Cu 2 S CE, remarkably improved photovoltaic performance was achieved for QDSSCs with Cu 2-x Se CEs. The superior catalytic activity and electrical conductivity of Cu 2-x Se CEs were verified by the electrochemical impedance spectra and Tafel-polarization measurements. To maximize the efficiency enhancement, the photoanodes were optimized by introducing a pillared porous titania composite as the scattering layers for further light harvesting and charge transfer improvement concurrently. The combination of effective Cu 2-x Se electrocatalysts and pillared titania scattering layers contributed to one of the best reported efficiencies of 7.11% for CdS/CdSe QDs co-sensitized solar cells.Keywords sensitized, dot, quantum, efficiency, boosting, cells, up, solar, 7, photoanode, 11, simultaneous, engineering, photocathode Disciplines Engineering | Physical Sciences and Mathematics Publication DetailsBai, Y., Han, C., Chen, X., Yu, H., Zong, X., Li, Z. & Wang, L. (2015). Boosting the efficiency of quantum dot sensitized solar cells up to 7.11% through simultaneous engineering of photocathode and photoanode. Nano Energy, 13 609-619. Authors Abstract:We demonstrate a new strategy of boosting the efficiency of quantum dot sensitized solar cells (QDSSCs) by engineering the photocathode and photoanode simultaneously.Nanostructured photocathodes based on non-stoichiometric Cu 2-x Se electrocatalysts were developed via a simple and scalable approach for CdS/CdSe QDs co-sensitized solar cells.Compared to Cu 2 S CE, remarkably improved photovoltaic performance was achieved forQDSSCs with Cu 2-x Se CEs. The superior catalytic activity and electrical conductivity of Cu 2-x Se CEs were verified by the electrochemical impedance spectra and Tafel-polarization measurements. To maximize the efficiency enhancement, the photoanodes were optimized by introducing a pillared porous titania composite as the scattering layers for further light harvesting and charge transfer improvement concurrently. The combination of effective Cu 2-x Se electrocatalysts and pillared titania scattering layers contributed to one of the best reported efficiencies of 7.11% for CdS/CdSe QDs co-sensitized solar cells.

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Electrocatalytic sulfur electrodes for CdS/CdSe quantum dot-sensitized solar cells

Abstract: We have fabricated highly efficient CdS/CdSe quantum dot-sensitized solar cells (QDSSCs) featuring low-cost cobalt sulfide (CoS) counter electrodes. Under 100 mW cm(-2) irradiation, the CdS/CdSe QDSSC featuring a CoS electrode provided an energy conversion efficiency as high as 3.4%.

Cited by 276 publications

References 32 publications

Quantum Dot–Sensitized Solar Cells Featuring CuS/CoS Electrodes Provide 4.1% Efficiency

Quantum Dot–Sensitized Solar Cells Featuring CuS/CoS Electrodes Provide 4.1% Efficiency

High-Efficiency Photochemical Water Splitting of CdZnS/CdZnSe Nanostructures

Boosting the efficiency of quantum dot sensitized solar cells up to 7.11% through simultaneous engineering of photocathode and photoanode

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