Economically viable V2O3@activated carbon composite materials as counter electrodes for dye sensitized solar cells by single step reduction

Wu, Kezhong; Liu, Zijun; Wu, Mengmeng; Ruan, Bei; Wu, Ruitao; Zhou, Huawei; Wu, Mingxing

doi:10.1016/j.jelechem.2019.01.034

Cited by 16 publications

(9 citation statements)

References 47 publications

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“…Thus, smaller Δ E p values indicate that the reaction I 3 – + 2e – → 3I – can be carried out at a rapid reaction rate on CEs. Larger I P can also demonstrate the catalytic material of CEs to more effectively catalyze the reduction of I 3 – to I – . On the basis of a comprehensive analysis of Δ E p and I P of the peaks, VC/V 2 O 3 (900 °C) presented a relatively lower overpotential and higher invertibility.…”

Section: Resultsmentioning

confidence: 97%

“…The peak-to-peak separation Δ E p was 0.381, 0.331, 0.387, 0.270, and 0.330 V, and the current density of the cathodic peak I P are 1.334, 1.491, 1.890, 2.046, and 1.944 mA·cm –2 , respectively, in the obtained materials at pyrolysis temperatures of 600, 700, 800, 900, and 1000 °C to serve as CEs for the iodide species I 3 – /I – at the low potential. The lower the value of Δ E p , the larger the redox ability, and reversibility of the regeneration reaction of I 3 – /I – would be beneficial to the enhancements of CE performance . In theory, Δ E p ∝ 1/ k s , where k s is the rate constant of the electrochemical reaction .…”

Section: Resultsmentioning

confidence: 99%

“…Larger I P can also demonstrate the catalytic material of CEs to more effectively catalyze the reduction of I 3 − to I − . 39 On the basis of a comprehensive analysis of ΔE p and I P of the peaks, VC/V 2 O 3 (900 °C) presented a relatively lower overpotential and higher invertibility. This revealed that VC/V 2 O 3 (900 °C) facilitated the smooth regeneration of I 3 − /I − and had higher catalytic activity than the other V-based derivatives and furthermore confirmed that combining the better catalytic activity of VC and high electrical conductivity of V 2 O 3 in one composite is a promising route to synthesize a superior catalyst (VC/V 2 O 3 ).…”

Section: Table 1 Textural Properties Of Five Differentmentioning

confidence: 99%

“…V P (cm − /I − would be beneficial to the enhancements of CE performance. 39 In theory, ΔE p ∝ 1/k s , where k s is the rate constant of the electrochemical reaction. 40 Thus, smaller ΔE p values indicate that the reaction I 3 − + 2e − → 3I − can be carried out at a rapid reaction rate on CEs.…”

Section: Table 1 Textural Properties Of Five Differentmentioning

confidence: 99%

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Facile Synthesis of V_xA_1–x(x = 0–1, A= C, O) Multiphase Composites Derived from Polyoxovanadate Precursors by Pyrolysis along a Temperature Gradient as Pt-free Counter Electrodes for High-Efficient Dye-Sensitized Solar Cells

Liu

et al. 2021

J. Phys. Chem. C

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Replacing precious Pt-based counter electrodes (CEs) with a low-cost and high-performance Pt-free catalyst of CEs is still in urgent need to decrease the fabrication cost of dye-sensitized solar cells (DSSCs). Herein, the elements V and A (A = C, O) of the final state of the target materials are prefabricated in an organic complex precursor by bonding, and then, the precursor was directly processed to prepare V x A1–x (x = 0–1, A = C, O) multiphase CE catalysts by pyrolysis along the temperature gradient under N2 flow, which further served as catalytic materials of CEs for the encapsulation of DSSCs. The precursors were obtained utilizing polyoxovanadate (NH4)2V6O16 as a metal source and glucose as a carbon source via a facile hydrothermal method. Power conversion efficiencies of 5.38, 6.29, 6.60, 6.82, and 6.23% were obtained from the five different V x A1–x (x = 0–1, A = C, O) multiphase CE catalysts as CEs to reduce iodide/triiodide in DSSCs, which were prepared at pyrolysis temperatures of 600, 700, 800, 900, and 1000 °C, respectively. The enhanced performance of V x A1–x materials can be attributed to the more catalytic active site number and the high conductivity, which is due to the higher specific surface area provided by the pyrolysis and carbonization of glucose and the activation and modification of materials at high temperature and N-doping. The impressive finding in this work indicates that the V x A1–x composite can be considered as a promising candidate for low-cost and high-efficient CEs in the fabrication of DSSCs.

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Section: Resultsmentioning

confidence: 97%

Section: Resultsmentioning

confidence: 99%

Section: Table 1 Textural Properties Of Five Differentmentioning

confidence: 99%

Section: Table 1 Textural Properties Of Five Differentmentioning

confidence: 99%

See 2 more Smart Citations

Facile Synthesis of V_xA_1–x(x = 0–1, A= C, O) Multiphase Composites Derived from Polyoxovanadate Precursors by Pyrolysis along a Temperature Gradient as Pt-free Counter Electrodes for High-Efficient Dye-Sensitized Solar Cells

Liu

et al. 2021

J. Phys. Chem. C

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“…41 Also, in our work, V 2 O 3 @AC composite catalysts have been fabricated by the pyrolysis of NH 4 VO 3 with different mass ratios of activated carbon (AC) at high temperatures. 42 Compared with the 4.54% PCE of Pt and 3.33% of pure V 2 O 3 , the DSSCs using V 2 O 3 @AC composite can reach the highest PCE of 5.55% for the regeneration of the I 3 − /I − redox couple. Gnanasekar et al wrapped monoclinic crystal VO 2 on one-dimensional carbon as a cost-effective CE and achieved a PCE of 6.53%.…”

Section: Introductionmentioning

confidence: 92%

Composites of Vanadium (III) Oxide (V₂O₃) Incorporating with Amorphous C as Pt-Free Counter Electrodes for Low-Cost and High-Performance Dye-Sensitized Solar Cells

et al. 2021

ACS Omega

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To replace precious Pt-based counter electrodes (CEs) with a low-cost Pt-free catalyst of CEs is still a motivating hotspot to decrease the fabrication cost of dye-sensitized solar cells (DSSCs). Herein, four different V 2 O 3 @C composite catalysts were synthesized by pyrolysis of a precursor under N 2 flow at 1100 °C and further served as catalytic materials of CEs for the encapsulation of DSSCs. The precursors of V 2 O 3 @C composites have been prepared via a sol–gel method using different proportions of V 2 O 5 with soluble starch in a H 2 O 2 solution. Power conversion efficiencies (PCEs) of 3.59, 4.79, 5.15, and 5.06% were obtained from different V 2 O 3 @C composites, with soluble starch-to-V 2 O 5 mass ratios (S/V) of 1:2, 1:1, 2:1, and 4:1, respectively, as CEs to reduce iodide/triiodide in DSSCs. The improvement of electrode performance is due to the combined effects on the increased specific surface area and the enhanced conductivity of V 2 O 3 @C composite catalysts.

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Applications of 3d-transition metals as Pt-free counter electrode for dye-sensitized solar cells application

Chandra

2022

Dye-Sensitized Solar Cells

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Economically viable V2O3@activated carbon composite materials as counter electrodes for dye sensitized solar cells by single step reduction

Cited by 16 publications

References 47 publications

Facile Synthesis of V_xA_1–x(x = 0–1, A= C, O) Multiphase Composites Derived from Polyoxovanadate Precursors by Pyrolysis along a Temperature Gradient as Pt-free Counter Electrodes for High-Efficient Dye-Sensitized Solar Cells

Facile Synthesis of V_xA_1–x(x = 0–1, A= C, O) Multiphase Composites Derived from Polyoxovanadate Precursors by Pyrolysis along a Temperature Gradient as Pt-free Counter Electrodes for High-Efficient Dye-Sensitized Solar Cells

Composites of Vanadium (III) Oxide (V₂O₃) Incorporating with Amorphous C as Pt-Free Counter Electrodes for Low-Cost and High-Performance Dye-Sensitized Solar Cells

Applications of 3d-transition metals as Pt-free counter electrode for dye-sensitized solar cells application

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Economically viable V2O3@activated carbon composite materials as counter electrodes for dye sensitized solar cells by single step reduction

Cited by 16 publications

References 47 publications

Facile Synthesis of VxA1–x(x = 0–1, A= C, O) Multiphase Composites Derived from Polyoxovanadate Precursors by Pyrolysis along a Temperature Gradient as Pt-free Counter Electrodes for High-Efficient Dye-Sensitized Solar Cells

Facile Synthesis of VxA1–x(x = 0–1, A= C, O) Multiphase Composites Derived from Polyoxovanadate Precursors by Pyrolysis along a Temperature Gradient as Pt-free Counter Electrodes for High-Efficient Dye-Sensitized Solar Cells

Composites of Vanadium (III) Oxide (V2O3) Incorporating with Amorphous C as Pt-Free Counter Electrodes for Low-Cost and High-Performance Dye-Sensitized Solar Cells

Applications of 3d-transition metals as Pt-free counter electrode for dye-sensitized solar cells application

Contact Info

Product

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Facile Synthesis of V_xA_1–x(x = 0–1, A= C, O) Multiphase Composites Derived from Polyoxovanadate Precursors by Pyrolysis along a Temperature Gradient as Pt-free Counter Electrodes for High-Efficient Dye-Sensitized Solar Cells

Facile Synthesis of V_xA_1–x(x = 0–1, A= C, O) Multiphase Composites Derived from Polyoxovanadate Precursors by Pyrolysis along a Temperature Gradient as Pt-free Counter Electrodes for High-Efficient Dye-Sensitized Solar Cells

Composites of Vanadium (III) Oxide (V₂O₃) Incorporating with Amorphous C as Pt-Free Counter Electrodes for Low-Cost and High-Performance Dye-Sensitized Solar Cells