Highly efficient telluride electrocatalysts for use as Pt-free counter electrodes in dye-sensitized solar cells

Guo, Jiahao; Shi, Yantao; Chu, Yuting; Ma, Tingli

doi:10.1039/c3cc45698f

Cited by 107 publications

(45 citation statements)

References 28 publications

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“…For reference, the DSSC based on Pt CE have achieved g of 6.59 % under the same test condition (V oc = 0.66 V, J sc = 15.60 mA cm -2 , FF = 0.64). The increase of V oc of DSSCs based on Co 9 Se 8 /CoSe CE can be attributed to the slightly largeR s , which is in good agreement with the Nyquist plots measurements [29,30]. It is clear that the g of DSSCs increases in the order of Pt \ Co 9 Se 8 /CoSe.…”

Section: Photovoltaic Performance Of Dsscssupporting

confidence: 81%

High-performance Co9Se8/CoSe counter electrode for dye-sensitized solar cells

Jiang

Gao

Lin

2014

J Sol-Gel Sci Technol

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In this paper, high-performance Co 9 Se 8 /CoSe counter electrodes (CEs) had been fabricated for dye-sensitized solar cells (DSSCs). The Co 9 Se 8 /CoSe structure had been successfully synthesized by a one-step solvothermal method. Co 9 Se 8 /CoSe films on conductive glass substrates were fabricated by a low-temperature spray deposition. The electrocatalytic activity of CEs had been characterized by cyclic voltammetry, Tafel-polarization curves, and electrochemical impedance spectroscopy (EIS). It was found that Co 9 Se 8 /CoSe film showed slightly higher electrocatalytic activity than Pt for the reduction of I À 3 . The power conversion efficiency of the DSSC based on Co 9 Se 8 /CoSe CE was improved from 6.59 to 6.75 %, with respect to a reference DSSC based on Pt CE.

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Section: Photovoltaic Performance Of Dsscssupporting

confidence: 81%

High-performance Co9Se8/CoSe counter electrode for dye-sensitized solar cells

Jiang

Gao

Lin

2014

J Sol-Gel Sci Technol

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“…Therefore, it is highly imperative to explore low-cost, abundant, and highly efficient substitutes for the conventional Pt counter electrode in the DSSC system. In recent years, several kinds of fascinating materials such as carbonaceous materials, [5,[25][26][27][28] conductive polymer [29,30] and metal compounds (metal nitrides, [31][32][33] metal carbides, [34,35] metal sulfides, [36][37][38][39] metal selenides [40,41] and metal telluride [42] ) were extensively investigated as counter electrodes for DSSCs. These substitutes showed comparable catalytic activity for I 3 − /I − .…”

Section: /Imentioning

confidence: 99%

High‐Performance Cobalt Selenide and Nickel Selenide Nanocomposite Counter Electrode for Both Iodide/Triiodide and Cobalt(II/III) Redox Couples in Dye‐Sensitized Solar Cells

Wang

Zhang

et al. 2014

Chin. J. Chem.

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The nanocomposites of cobalt selenide and nickel selenide (Co 0.85 Se/Ni 0.85 Se) were successfully fabricated on FTO glass by a facile co-electrodeposition method at ambient temperature. Nanocomposite films were used as electrocatalysts in dye-sensitized solar cell counter electrodes for regeneration of both iodide/triiodide and cobalt(II/III) redox couples. Co 0.85 Se/Ni 0.85 Se were mainly composed of nanoflakes and nanoparticles. It is noted that such nanostructure generated by nanoparticles embedded with 2D nanoflakes led to high active sites and was accessible to cobalt(II/III) electrolyte, delivering better catalytic activity for the reduction of larger volume cobalt(II/III). As a result, for cobalt(II/III) electrolyte, the Co 0.85 Se/Ni 0.85 Se based dye-sensitized solar cell performed significantly improved efficiency than that of Pt and Co 0.85 Se. Meanwhile, the Co 0.85 Se/Ni 0.85 Se based dye-sensitized solar cell held comparable energy conversion efficiency to that of Pt and Co 0.85 Se for iodide/triiodide electrolyte.

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“…As displayed in Fig. 4b, the highfrequency intercept on the real axis determines the serial resistance (R s ), while two semicircles observed for each curve in the highfrequency (left) and low-frequency (right) regions are assigned, respectively, to the charge-transfer resistance (R ct ) at the electrode/electrolyte interface, and the ionic diffusion impedance (Z N ) of the I¯/I 3¯ redox couple in the electrolyte 41 . Table 1 lists the fit data for R s and R ct .…”

Section: Resultsmentioning

confidence: 99%

Ultrafast electrochemical preparation of graphene/CoS nanosheet counter electrodes for efficient dye-sensitized solar cells

Chen

Min

et al. 2015

RSC Adv.

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Utilizing inexpensive, high-efficiency counter electrodes (CEs) to replace the traditional platinum counterparts in dyesensitized solar cells (DSSCs) is worthwhile. In this paper, we detail how we synchronously prepared composite CEs of CoS nanosheet arrays and reduced graphene oxide (rGO) layers for the first time via a low temperature, ultrafast one-step electrochemical strategy. With this approach, the whole fabrication process of the composite CEs was only a small percentage of the average time (∼15 hours) using other methods. The DSSC assembled with the rGO-CoS composite CE achieved an enhanced power conversion efficiency (PCE) of 8.34%, which is dramatically higher than 6.27% of pure CoS CE-based DSSC and even exceeds 7.50% of Pt CE-based DSSC. The outstanding PCE breakthrough is indubitably attributed to the enhancement in electrocatalytic ability of the rGO-CoS composite CE due to the incorporation of highly conducting rGO layers and the GO layers-induced growth of CoS nanosheet arrays with higher density and larger surface area. Therefore, lower charge-transfer resistance and higher exchange current density can be achieved as corroborated by the electrochemical impedance spectra (EIS) and Tafel polarization curves (TPCs). Further experiments also proved that the electrochemical strategy exhibited its universality of fabricating other graphene-enhanced chalcogenide functional composite films.

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Highly efficient telluride electrocatalysts for use as Pt-free counter electrodes in dye-sensitized solar cells

Cited by 107 publications

References 28 publications

High-performance Co9Se8/CoSe counter electrode for dye-sensitized solar cells

High-performance Co9Se8/CoSe counter electrode for dye-sensitized solar cells

High‐Performance Cobalt Selenide and Nickel Selenide Nanocomposite Counter Electrode for Both Iodide/Triiodide and Cobalt(II/III) Redox Couples in Dye‐Sensitized Solar Cells

Ultrafast electrochemical preparation of graphene/CoS nanosheet counter electrodes for efficient dye-sensitized solar cells

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