Enhanced thermoelectric properties of p-type CoSb3/graphene nanocomposite

Feng, Bin; Xie, Jian; Cao, Gaoshao; Zhu, Tiejun; Zhao, Xinbing

doi:10.1039/c3ta13202a

Cited by 111 publications

(89 citation statements)

References 68 publications

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“…Meanwhile, some graphene nanosheets tended to form thick aggregations and the average length of aggregations was about 3 µm. A similar phenomenon was also observed by Zhao et al in the graphene/CoSb 3 nanocomposite [26]. The results of energy dispersive X-ray spectroscopy (EDS) for graphene/Cu 2 SnSe 3 sample identify that the matrix consisted of 33.17 atom % copper, 16.79 atom % tin, and 50.04 atom % selenium, indicating the Cu 2 SnSe 3 phase, just as shown in Figure 5.…”

Section: Methodssupporting

confidence: 64%

Enhanced Thermoelectric Properties of Graphene/Cu2SnSe3 Composites

Zhao

Wang

2017

Crystals

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Cu 2 SnSe 3 material is regarded as a potential thermoelectric material due to its relatively high carrier mobility and low thermal conductivity. In this study, graphene was introduced into the Cu 2 SnSe 3 powder by ball milling, and the bulk graphene/Cu 2 SnSe 3 thermoelectric composites were prepared by spark plasma sintering. The graphene nanosheets distributed uniformly in the Cu 2 SnSe 3 matrix. Meanwhile, some graphene nanosheets tended to form thick aggregations, and the average length of these aggregations was about 3 µm. With the fraction of graphene increasing, the electrical conductivity of graphene/Cu 2 SnSe 3 samples increased greatly while the Seebeck coefficient was decreased. The introduction of graphene nanosheets can reduce the thermal conductivity effectively resulting from the phonon scattering by the graphene interface. When the content of graphene exceeds a certain value, the thermal conductivity of graphene/Cu 2 SnSe 3 composites starts to increase. The achieved highest figure of merit (ZT) for 0.25 vol % graphene/Cu 2 SnSe 3 composite was 0.44 at 700 K.

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Section: Methodssupporting

confidence: 64%

Enhanced Thermoelectric Properties of Graphene/Cu2SnSe3 Composites

Zhao

Wang

2017

Crystals

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“…The decrease in the sizes of Mg 3 Sb 2 particles in Mg 3 Sb 2 /GNS nanocomposites indicates that the GNS in Mg 3 Sb 2 matrix suppresses the growth of the grain boundaries which is consistent with our SEM investigation. [64][65][66][67][68] The presence of GNS can easily be discerned in Fig. 9(b & c) as the lattice fringes corresponding to GNS can be clearly identied.…”

Section: Resultsmentioning

confidence: 94%

“…Thus, we believe that graphene rened the size of Mg 3 Sb 2 particles and generates reduced grain boundaries upon the formation of nanocomposites similar to the other reports for many other systems. [64][65][66][67][68] Obviously, the graphene in Mg 3 Sb 2 matrix prevents the growth of grain boundary. The SEM-EDAX analysis (Fig.…”

Section: Resultsmentioning

confidence: 99%

Graphene boosts thermoelectric performance of a Zintl phase compound

et al. 2015

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The concept of nanocomposites derived by incorporating a second minor phase in bulk thermoelectric materials has established itself as an effective paradigm for optimizing high thermoelectric performance.In this work, this paradigm is for the first time extended to bulk Zintl phase Mg 3 Sb 2 and its isoelectronically Bi-doped derivative Mg 3 Sb 1.8 Bi 0.2 system. Herein, we report the synthesis, microstructural details, electronic structure and thermoelectric properties of (Mg 3 Sb 2 , Mg 3 Sb 1.8 Bi 0.2 )/ graphene nanosheet (GNS) nanocomposites with different mass ratios. Field emission scanning electron microscopy (FE-SEM) and transmission electron microscopy (TEM) investigation reveals that Mg 3 Sb 2 nanoparticles are homogenously anchored on the surface of GNS. We demonstrate that Mg 3 Sb 2 -based materials incorporated with a small content of graphene outperform optimally, resulting in potential ptype thermoelectric materials. The present nanocomposite additive of GNS deriving such a novel nanocomposite of (Mg 3 Sb 2 , Mg 3 Sb 1.8 Bi 0.2 )/GNS, enhances the electrical conductivity significantly, thereby resulting in a substantially large increase in the power factor. The enhanced electrical conductivity of these nanocomposites is attributed to the increase in the carrier concentration and high carrier mobility owing to the ultra high mobility of graphene. X-ray photoelectron spectroscopy (XPS) core level spectra confirm weak bonding between GNS and Mg 3 Sb 2 . Increase in carrier concentration is reflected in XPS valence band spectra and change in spectral weight near valence band maxima is indicative of increased electrical conductivity in the nanocomposite material. The thermal conductivity of these nanocomposites is noted to be reduced at high temperature. These favorable conditions lead to enhanced thermoelectric figure-of-merit (ZT) z 0.71 at 773 K for Mg 3 Sb 2 /GNS and a ZT z 1.35 at 773 K for Mg 3 Sb 1.8 Bi 0.2 /GNS nanocomposites with the mass ratio of 80 : 1 which are $170% and $125% higher values compared to bare Mg 3 Sb 2 and bare Mg 3 Sb 1.8 Bi 0.2 respectively. We strongly believe that the present novel strategy of fabricating such a nanocomposite of a Zintl compound by utilizing GNS as a nanocomposite additive, may provide an emerging path for improving thermoelectric properties of various Zintl phase compounds.

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“…ptype conduction) which is consistent with the previous reports. 34,35 Our observed variations in electrical conductivity and Seebeck coefficient correlate to changes in the morphology, stoichiometry/composition and local atomic order with deposition potential. The globular grains start converting into ake-like structures as more cobalt is there in the lms.…”

Section: 34mentioning

confidence: 96%

Deposition potential controlled structural and thermoelectric behavior of electrodeposited CoSb₃ thin films

Yadav

Chaudhary

et al. 2017

RSC Adv.

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In this study, the deposition potential has been used to exercise control on structural and electrical properties, and associated tuning of thermoelectric properties of CoSb 3 thin films prepared by electrochemical synthesis. Deposition potential is observed to have a strong effect on the stoichiometry of films and orientation of crystallites, and consequently on the physical properties. X-ray diffraction patterns reveal that the films grown at lower deposition potentials (#À0.9 V) have (013) preferred orientation whereas (420) orientation is observed at higher negative deposition potentials. A correlation of the deposition potential controlled composition from a Sb-rich to a Co-rich regime and the resulting tuning of electrical transport parameters and thermoelectric properties of the CoSb 3 thin films is established. With enlarged crystallites and enhanced textured structure at a deposition potential of À0.97 V, a significantly large Seebeck coefficient (58 mV K À1) with a simultaneously large electrical conductivity (2.1 Â 10 3 U À1 cm À1) are achieved as a result of the high mobility (60 cm 2 V À1 s À1). A high value for room temperature power factor (706 AE 9 mW K À2 m À1) observed in the as-grown CoSb 3 thin films without any further post-deposition annealing makes their synthesis and thermoelectric studies interesting for their potential applications in power generation and refrigeration.

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Enhanced thermoelectric properties of p-type CoSb3/graphene nanocomposite

Cited by 111 publications

References 68 publications

Enhanced Thermoelectric Properties of Graphene/Cu2SnSe3 Composites

Enhanced Thermoelectric Properties of Graphene/Cu2SnSe3 Composites

Graphene boosts thermoelectric performance of a Zintl phase compound

Deposition potential controlled structural and thermoelectric behavior of electrodeposited CoSb₃ thin films

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Enhanced thermoelectric properties of p-type CoSb3/graphene nanocomposite

Cited by 111 publications

References 68 publications

Enhanced Thermoelectric Properties of Graphene/Cu2SnSe3 Composites

Enhanced Thermoelectric Properties of Graphene/Cu2SnSe3 Composites

Graphene boosts thermoelectric performance of a Zintl phase compound

Deposition potential controlled structural and thermoelectric behavior of electrodeposited CoSb3 thin films

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Deposition potential controlled structural and thermoelectric behavior of electrodeposited CoSb₃ thin films