A catalyst-free new polyol method synthesized hot-pressed Cu-doped Bi2S3 nanorods and their thermoelectric properties

Tarachand,; Sharma, Vikash; Bhatt, Ranu; Ganesan, V.; Okram, G. S.

doi:10.1007/s12274-016-1207-6

Cited by 47 publications

(46 citation statements)

References 45 publications

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“…And two B 1g modes were detected in the cases of monoclinic Cu 2.93 Bi 4.89 S 9 and orthorhombic Cu 3 BiS 3 , respectively. The peak locations can be consistent with reported data of Cu‐doped Bi 2 S 3 . No extra peak from the Cu−S mode at approximately 335 cm −1 was observed …”

Section: Resultsmentioning

confidence: 99%

“…The peak locations can be consistent with reported data of Cu-doped Bi 2 S 3 . [17] No extra peak from the CuÀ S mode at approximately 335 cm À 1 was observed. [50]…”

Section: Morphology Component and Structure Analysismentioning

confidence: 99%

“…Zhang et al and Okram et al found that doping of Cu into the crystal lattice of Bi 2 S 3 could improve the thermoelectric property by simultaneously reducing of both electrical and thermal conductivity. [16,17] It seems that ternary sulfides with high ratio of Bi may endow them low thermal conductivity and affording high thermoelectric performances. [18,19] CuÀ BiÀ S system could form diverse composition and structure combination that is dependent on the synthetic method.…”

Section: Introductionmentioning

confidence: 99%

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Phase‐Controlled Synthesis of High‐Bi‐Ratio Ternary Sulfide Nanocrystals of Cu_1.57Bi_4.57S₈ and Cu_2.93Bi_4.89S₉

et al. 2018

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High Bi‐ratio ternary sulfides have been recently reported as superior thermoelectric materials. However, the synthesis of high Bi‐ratio Cu−Bi−S nanocrystal remains a challenge. Reported here are the synthesis and characterization of three‐phase Cu−Bi−S nanocrystals with the nominal chemical formulae of Cu1.57Bi4.57S8, Cu2.93Bi4.89S9 and Cu3BiS3. The samples were prepared using a Bi2S3 precursor by varying the amount and type of Cu2‐xS (i. e. Cu2S or Cu7.2S4) reactants. TEM images reveal that two new samples crystalized having nanorod morphology with radii of approximately 50 nm and lengths of 200 nm. XPS results indicate that the valence states of Bi in both the two new phases are +3 with viable oxidation states for Cu. UV‐Vis‐NIR absorption spectroscopy reveals that narrow direct bandgaps are 1.12 and 1.27 eV for Cu1.57Bi4.57S8 and Cu2.93Bi4.89S9, respectively. Besides, this method could also be applied to synthesize the Cu3BiS3 phase with a new nanoplate morphology. The as‐synthesized Cu−Bi−S samples show Cu/Bi ratio‐dependent photoresponsive properties. This study not only reports the structure and bandgap of two ternary sulfides, which have only been discovered in the mineral previously, but also provides an efficient method for synthesizing Bi‐rich ternary chalcogenide nanocrystals.

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Section: Resultsmentioning

confidence: 99%

“…The peak locations can be consistent with reported data of Cu-doped Bi 2 S 3 . [17] No extra peak from the CuÀ S mode at approximately 335 cm À 1 was observed. [50]…”

Section: Morphology Component and Structure Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Phase‐Controlled Synthesis of High‐Bi‐Ratio Ternary Sulfide Nanocrystals of Cu_1.57Bi_4.57S₈ and Cu_2.93Bi_4.89S₉

et al. 2018

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“…The dual-phase heterostructures of Ag 2 S@Ag nanocomposites can play special role in its TE performance. The increase in phase fraction of Ag with increasing reaction temperature is due to the volatile nature of sulphur which can come out from Ag 2 S matrix at high temperature (>220 o C) in the gas form (H 2 S/SO 2 ) [4,7]. The average particle size calculated using Scherre's formula is 45 nm, 50 nm and 53 nm for AgS1, AgS9 and AgS10, respectively.…”

Section: Resultsmentioning

confidence: 99%

“…In typical synthesis, 6 millimole (mmol) of AgNO 3 (99.9999, Sigma Aldrich) and 4 mmol of thiourea (98%, Merck) were dissolved into 50 mL diethylene glycol (DEG, ≥98.5%, Merck) using magnetic stirrer in round bottom three neck flask (TNF). We have taken little excess quantity of sulphur source in synthesis because sulphur is volatile and can come out in form of gases (SO 2 /H 2 S) [7]. An inert atmosphere through continuous flow of Ar-gas was maintained using two outer necks of TNF in stirred solution and heating started at the rate of 6 o C/min using controlled heating mantle.…”

Section: Methodsmentioning

confidence: 99%

Enhanced thermoelectric performance of Ag2S nanoparticles by Ag-nanoinclusions

Tarachand¹,

Venkatesh²,

Okram³

2019

AIP Conference Proceedings

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We have demonstrated a simple strategy for improvement of thermoelectric performance of Ag 2 S based composites by modifying reaction conditions in polyol method. The existence of two-phased heterostructure in Ag 2 S@Ag nanocomposites is confirmed from dual phase Rietveld refinement of its powder X-ray diffraction. The FESEM images confirmed the formation of nanodisks of average thickness 80 nm and width in few hundreds of nm. A systematic reduction in electrical resistivity with increasing Ag-content is observed which leads an enhancement in power factor. The values of Seebeck coefficient are positive or negative depend on fraction of Ag-content in Ag 2 S matrix. Finally, a significantly high power factor is obtained for Ag 2 S@Ag nanocomposites synthesized at 245 o C. This work open a new way for reduction of electrical resistivity of resistive Ag 2 S and hence improved its thermoelectric efficiency.

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Bi₂S₃‐Cu₃BiS₃ Mixed Phase Interlayer for High‐Performance Cu₃BiS₃‐Photocathode for 2.33% Unassisted Solar Water Splitting Efficiency

et al. 2023

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To realize practical solar hydrogen production, a low‐cost photocathode with high photocurrent density and onset potential should be developed. Herein, an efficient and stable overall photoelectrochemical tandem cell is developed with a Cu3BiS3‐based photocathode. By exploiting the crystallographic similarities between Bi2S3 and Cu3BiS3, a one‐step solution process with two sulfur sources is used to prepare the Bi2S3–Cu3BiS3 blended interlayer. The elongated Bi2S3‐Cu3BiS3 mixed‐phase 1D nanorods atop a planar Cu3BiS3 film enable a high photocurrent density of 7.8 mA cm−2 at 0 V versus the reversible hydrogen electrode, with an onset potential of 0.9 VRHE. The increased performance over the single‐phase Cu3BiS3 thin‐film photocathode is attributed to the enhanced light scattering and charge collection through the unique 1D nanostructure, improved electrical conductivity, and better band alignment with the n‐type CdS layer. A solar‐to‐hydrogen efficiency of 2.33% is achieved under unassisted conditions with a state‐of‐the‐art Mo:BiVO4 photoanode, with excellent stability exceeding 21 h.

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A catalyst-free new polyol method synthesized hot-pressed Cu-doped Bi2S3 nanorods and their thermoelectric properties

Cited by 47 publications

References 45 publications

Phase‐Controlled Synthesis of High‐Bi‐Ratio Ternary Sulfide Nanocrystals of Cu_1.57Bi_4.57S₈ and Cu_2.93Bi_4.89S₉

Phase‐Controlled Synthesis of High‐Bi‐Ratio Ternary Sulfide Nanocrystals of Cu_1.57Bi_4.57S₈ and Cu_2.93Bi_4.89S₉

Enhanced thermoelectric performance of Ag2S nanoparticles by Ag-nanoinclusions

Bi₂S₃‐Cu₃BiS₃ Mixed Phase Interlayer for High‐Performance Cu₃BiS₃‐Photocathode for 2.33% Unassisted Solar Water Splitting Efficiency

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A catalyst-free new polyol method synthesized hot-pressed Cu-doped Bi2S3 nanorods and their thermoelectric properties

Cited by 47 publications

References 45 publications

Phase‐Controlled Synthesis of High‐Bi‐Ratio Ternary Sulfide Nanocrystals of Cu1.57Bi4.57S8 and Cu2.93Bi4.89S9

Phase‐Controlled Synthesis of High‐Bi‐Ratio Ternary Sulfide Nanocrystals of Cu1.57Bi4.57S8 and Cu2.93Bi4.89S9

Enhanced thermoelectric performance of Ag2S nanoparticles by Ag-nanoinclusions

Bi2S3‐Cu3BiS3 Mixed Phase Interlayer for High‐Performance Cu3BiS3‐Photocathode for 2.33% Unassisted Solar Water Splitting Efficiency

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Product

Resources

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Phase‐Controlled Synthesis of High‐Bi‐Ratio Ternary Sulfide Nanocrystals of Cu_1.57Bi_4.57S₈ and Cu_2.93Bi_4.89S₉

Phase‐Controlled Synthesis of High‐Bi‐Ratio Ternary Sulfide Nanocrystals of Cu_1.57Bi_4.57S₈ and Cu_2.93Bi_4.89S₉

Bi₂S₃‐Cu₃BiS₃ Mixed Phase Interlayer for High‐Performance Cu₃BiS₃‐Photocathode for 2.33% Unassisted Solar Water Splitting Efficiency