Petal-like cobalt selenide nanosheets used as counter electrode in high efficient dye-sensitized solar cells

Dong, Jia; Wu, Jihuai; Zheng, Min; Huo, Jinghao; Tu, Yongguang; Lan, Zhang

doi:10.1007/s10854-015-2713-0

Cited by 13 publications

(3 citation statements)

References 30 publications

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“…Consequently, the Co 0.85 Se nanosheet CE produced a higher PCE (9.40%) than the Co 0.85 Se nanoparticle CE (7.88%). 7 When proper amounts of NaOH, oleic acid, and ethanol were added to the above hydrothermal reaction, petal-like Co 0.85 Se nanosheets were obtained, 35 which also achieved a higher PCE than the Pt CE. 35 By contrast, the nanoparticle morphology of Co 0.85 Se showed inferior performance to the Pt CE.…”

Section: Morphology Effectmentioning

confidence: 99%

Metal Selenides as Efficient Counter Electrodes for Dye-Sensitized Solar Cells

et al. 2017

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Solar energy is the most abundant renewable energy available to the earth and can meet the energy needs of humankind, but efficient conversion of solar energy to electricity is an urgent issue of scientific research. As the third-generation photovoltaic technology, dye-sensitized solar cells (DSSCs) have gained great attention since the landmark efficiency of ∼7% reported by O'Regan and Grätzel. The most attractive features of DSSCs include low cost, simple manufacturing processes, medium-purity materials, and theoretically high power conversion efficiencies. As one of the key materials in DSSCs, the counter electrode (CE) plays a crucial role in completing the electric circuit by catalyzing the reduction of the oxidized state to the reduced state for a redox couple (e.g., I/I) in the electrolyte at the CE-electrolyte interface. To lower the cost caused by the typically used Pt CE, which restricts the large-scale application because of its low reserves and high price, great effort has been made to develop new CE materials alternative to Pt. A lot of Pt-free electrocatalysts, such as carbon materials, inorganic compounds, conductive polymers, and their composites with good electrocatalytic activity, have been applied as CEs in DSSCs in the past years. Metal selenides have been widely used as electrocatalysts for the oxygen reduction reaction and light-harvesting materials for solar cells. Our group first expanded their applications to the DSSC field by using in situ-grown CoSe nanosheet and NiSe nanoparticle films as CEs. This finding has inspired extensive studies on developing new metal selenides in order to seek more efficient CE materials for low-cost DSSCs, and a lot of meaningful results have been achieved in the past years. In this Account, we summarize recent advances in binary and mutinary metal selenides applied as CEs in DSSCs. The synthetic methods for metal selenides with various morphologies and stoichiometric ratios and deposition methods for CE films are described. We emphasize that the in situ growth method exhibits advantages over other methods for fabricating stable and efficient CEs. We focus on the effect of morphology on the electocatalytic and photovoltaic performance. Application of transparent metal selenide CEs in bifacial DSSCs and the superiority of in situ-grown metal selenide nanosheet fiber CEs used for fiber DSSCs are presented. In addition, we show that metal selenides with a hollow sphere structure can function not only as an efficient electrocatalyst but also as a light-scattering layer. Finally, we present our views on the current challenges and future development of metal selenide CE materials.

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Section: Morphology Effectmentioning

confidence: 99%

Metal Selenides as Efficient Counter Electrodes for Dye-Sensitized Solar Cells

et al. 2017

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“…Cobalt selenide is a kind of semiconductor materials with band gap of 1.52 eV [14]. The varieties of cobalt selenide include CoSe [15,16], CoSe 2 [17] and Co 0.85 Se with nonintegral ratio [18][19][20]. In recent years, cobalt selenium has received extensive attention due to its excellent performances as catalyst in the fields of redox reaction, catalytic decomposition of hydrazine hydrate, magnetic refrigeration and Li-ion batteries [21,22].…”

Section: Introductionmentioning

confidence: 99%

Synthesis of ZnO-loaded Co0.85Se nanocomposites and their enhanced performance for decomposition of hydrazine hydrate and catalytic hydrogenation of p-nitrophenol

Zhang

Song

et al. 2016

Applied Catalysis A: General

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Nanocomposite is a kind of multiphase solid materials with nano-dimensional. It generally displays more preferable performance than its corresponding single precursors or conventional composite materials due to size effect and interfacial effect. Herein, we report the synthesis of a kind of nanocomposite via one pot route without using any surfactant or structure-directing agents. The structure, composition and morphology of the as-synthesized products were characterized by XRD, XPS, SEM, TEM and BET surface area measurements. The results revealed that the prepared nanocomposites were consisted of ZnO-loaded Co 0.85 Se nanocomposites. BET measurement showed the specific surface area of the nanocomposite was 66.5 m 2 g-1 at 77.5 K. Interestingly, the ZnO-loaded Co 0.85 Se nanocomposites exhibit remarkable performance for the decomposition of hydrazine hydrate and catalytic hydrogenation of p-nitrophenol compared with individual component of Co 0.85 Se or ZnO. More importantly, the obtained nanocomposites have very excellent stability and reversibility as catalysts, indicating that the products can be potentially used in wastewater treatment.

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“…10,12 Nevertheless, its high price, scarcity in the earth's crust, and obligatory high heat treating conditions are critical issues which hold back the practical use of Pt. Therefore, a lot of Pt-free electrocatalysts, including carbon-based materials, [13][14][15] conductive polymers, 16,17 and earthabundant transition metal compounds [18][19][20][21][22][23][24][25] have been studied. Among them, cobalt selenide-based compounds are promising alternatives to Pt because of their superior electrocatalytic ability.…”

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confidence: 99%

Potentiodynamic Electrodeposition of CoSe₂ Films and Their Excellent Electrocatalytic Activity as Counter Electrodes for Dye-Sensitized Solar Cells

Quy

Park

Kang

et al. 2019

J. Electrochem. Soc.

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Cobalt selenide (CoSe 2 ) thin films are successfully formed on F-doped SnO 2 (FTO) via a single step potentiodynamic electrodeposition process without any post treatment, and are utilized as counter electrodes (CEs) for dye-sensitized solar cells (DSSCs). The electrochemical behavior of the electrodeposited FTO/CoSe 2 films is examined through Tafel polarization, cyclic voltammetry, and electrochemical impedance spectroscopy measurements. The results indicate that the FTO/CoSe 2 films exhibit outstanding electrocatalytic ability and electrochemical stability toward the I − /I − 3 redox couple. The optimized FTO/CoSe 2 film fully covers the FTO substrate and features a nanoporous structure of interconnecting nanocrystalline networks, which is beneficial for the diffusion of ions and provides numerous electrochemical active sites. The optimized DSSC using FTO/CoSe 2 as CE exhibits a significantly improved cell efficiency of 7.95% compared to that of the DSSC using FTO/Pt as CE (7.48%).

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Petal-like cobalt selenide nanosheets used as counter electrode in high efficient dye-sensitized solar cells

Cited by 13 publications

References 30 publications

Metal Selenides as Efficient Counter Electrodes for Dye-Sensitized Solar Cells

Metal Selenides as Efficient Counter Electrodes for Dye-Sensitized Solar Cells

Synthesis of ZnO-loaded Co0.85Se nanocomposites and their enhanced performance for decomposition of hydrazine hydrate and catalytic hydrogenation of p-nitrophenol

Potentiodynamic Electrodeposition of CoSe₂ Films and Their Excellent Electrocatalytic Activity as Counter Electrodes for Dye-Sensitized Solar Cells

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Petal-like cobalt selenide nanosheets used as counter electrode in high efficient dye-sensitized solar cells

Cited by 13 publications

References 30 publications

Metal Selenides as Efficient Counter Electrodes for Dye-Sensitized Solar Cells

Metal Selenides as Efficient Counter Electrodes for Dye-Sensitized Solar Cells

Synthesis of ZnO-loaded Co0.85Se nanocomposites and their enhanced performance for decomposition of hydrazine hydrate and catalytic hydrogenation of p-nitrophenol

Potentiodynamic Electrodeposition of CoSe2 Films and Their Excellent Electrocatalytic Activity as Counter Electrodes for Dye-Sensitized Solar Cells

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Potentiodynamic Electrodeposition of CoSe₂ Films and Their Excellent Electrocatalytic Activity as Counter Electrodes for Dye-Sensitized Solar Cells