Enhanced thermoelectric performances in BiCuSeO oxyselenides via Er and 3D modulation doping

Feng, Bo; Li, Guangqiang; Pan, Zhao; Hu, Xiaoming; Liu, Peihai; Li, Yawei; He, Zhu; Fan, Xiaoliang

doi:10.1016/j.ceramint.2018.11.130

Cited by 30 publications

(20 citation statements)

References 30 publications

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“…Furthermore, the unique shear exfoliation technique enables an effective grain refinement with higher anisotropy of the polycrystalline pellet, leading to a further improved S 2 σ and a suppressed κ l , which gives rise to such a high ZT. We compared our results with reported values as shown in Figure 1d, [42][43][44][45][46][47][48][49][50][51][52] indicating that our record-high ZT of ≈1.6 is competitive and exhibits great potential for applying to practical thermoelectric devices.…”

Section: Introductionmentioning

confidence: 61%

“…As a result, a much improved ZT from ≈0.90 to ≈1.25 can be achieved at x = 0.01, as shown in Figure 5i, which is very competitive to that of the reported works. [38,42,43,55,44,45,67,[46][47][48][49][50][51][52]71,72] As discussed above, although the rational compositional and phase designs can significantly improve μ and S 2 σ of p-type polycrystalline BiCuSeO, the simultaneously enlarged grain size is still a challenge that needs to be solved to achieve a lower κ. [76] To achieve this goal, we employed a unique shear exfoliation technique rather than the conventional ball-milling route to further reduce the powder size.…”

Section: Resultsmentioning

confidence: 99%

“…The pellet was cut into small pieces for evaluating the thermoelectric performance along the same direction (perpendicular to the sintering pressure). d) Temperature-dependent ZT of as-fabricated Bi 0.94 Pb 0.06 CuSe 1.01 O 0.99 compared with reported works [42][43][44][45][46][47][48][49][50][51][52].…”

mentioning

confidence: 94%

“…d) Temperature-dependent ZT of as-fabricated Bi 0.94 Pb 0.06 CuSe 1.01 O 0.99 compared with reported works. [42][43][44][45][46][47][48][49][50][51][52] a synergy of rational band manipulation, multi-dimensional crystal imperfection design, and anisotropy strengthening in refined micro/nanograins. We choose 6% Pb-doped BiCuSeO as our initial materials because Pb-doping at Bi-site has been confirmed as an effective approach to tune the n p , and ≈6% is a proper doping concentration that can achieve this goal, verified by many previous works.…”

Section: Introductionmentioning

confidence: 99%

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Rational Electronic and Structural Designs Advance BiCuSeO Thermoelectrics

Shi

Pan

et al. 2021

Adv Funct Materials

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In this work, a record high thermoelectric figure-of-merit ZT of 1.6 ± 0.2 at 873 K in p-type polycrystalline Bi 0.94 Pb 0.06 CuSe 1.01 O 0.99 by a synergy of rational band manipulation and novel nanostructural design is reported. First-principles density functional theory calculation results indicate that the density of state at the Fermi level that crosses the valence band can be significantly reduced and the measured optical bandgap can be enlarged from 0.70 to 0.74 eV by simply replacing 1% O with 1% Se, both indicating a potentially reduced carrier concentration and in turn, an improved carrier mobility and a boosted power factor up to 9.0 µW cm −1 K −2 . Meanwhile, comprehensive characterizations reveal that under Se-rich condition, Cu 2 Se secondary microphases and significant lattice distortions triggered by Pb-doping and Se-substitution can be simultaneously achieved, contributing to a reduced lattice thermal conductivity of 0.4 W m −1 K −1 . Furthermore, a unique shear exfoliation technique enables an effective grain refinement with higher anisotropy of the polycrystalline pellet, leading to a further improved power factor up to 10.9 µW cm −1 K −2 and a further reduced lattice thermal conductivity of 0.30 W m −1 K −1 , which gives rise to record high ZT.

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Section: Introductionmentioning

confidence: 61%

Section: Resultsmentioning

confidence: 99%

mentioning

confidence: 94%

Section: Introductionmentioning

confidence: 99%

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Rational Electronic and Structural Designs Advance BiCuSeO Thermoelectrics

Shi

Pan

et al. 2021

Adv Funct Materials

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“…Best performing oxide‐based materials highlighting (A) highest σ, (B) low κ t and (C) ZT value via miscellaneous optimization techniques …”

Section: High Performance Inorganic Te Materialsmentioning

confidence: 99%

Inorganic thermoelectric materials: A review

et al. 2020

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Summary Thermoelectric generator, which converts heat into electrical energy, has great potential to power portable devices. Nevertheless, the efficiency of a thermoelectric generator suffers due to inefficient thermoelectric material performance. In the last two decades, the performance of inorganic thermoelectric materials has been significantly advanced through rigorous efforts and novel techniques. In this review, major issues and recent advancements that are associated with the efficiency of inorganic thermoelectric materials are encapsulated. In addition, miscellaneous optimization strategies, such as band engineering, energy filtering, modulation doping, and low dimensional materials to improve the performance of inorganic thermoelectric materials are reported. The methodological reviews and analyses showed that all these techniques have significantly enhanced the Seebeck coefficient, electrical conductivity, and reduced the thermal conductivity, consequently, improved ZT value to 2.42, 2.6, and 1.85 for near‐room, medium, and high temperature inorganic thermoelectric material, respectively. Moreover, this review also focuses on the performance of silicon nanowires and their common fabrication techniques, which have the potential for thermoelectric power generation. Finally, the key outcomes along with future directions from this review are discussed at the end of this article.

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Enhanced CO₂ Reduction Performance of BiCuSeO‐Based Hybrid Catalysts by Synergetic Photo‐Thermoelectric Effect

Han

Luo

et al. 2021

Adv Funct Materials

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Gaseous CO 2 reduction driven by solar energy is a promising solution to the current energy crisis and environmental problems. Although thermocatalysts, electrocatalysts, and photocatalysts are developed as classical strategies for CO 2 reduction, it remains a challenge for high efficiency and CO 2 net reduction during this process. Here, a multi-field driven hybrid catalyst, Pt/ZnO nanorod arrays/Bi 1-x Er x CuSeO, is designed using the photothermoelectric effect, which can take advantage of both photocatalysis and thermocatalysis. The results indicate that the maximum CO production rate of 2.91 µmol g -1 h -1 at 423 K can be realized in such Pt/ZnONR/ Bi 0.9 Er 0.1 CuSeO hybrid catalyst, as can be ascribed to a synergetic photothermoelectric effect (i.e., light irradiation can provide heat, photo-excited carriers, and the concomitant Seebeck voltage). The band alignment of ZnO/BiCuSeO heterojunction and carriers transport are proposed to be optimized by the Er doped BiCuSeO thermoelectric supports, greatly enhancing the catalytic performance. The application of thermoelectric support could be promising in the structure design of multi-field driven hybrid catalysts, and such a photo-thermoelectric catalytic process demonstrates a desirable way of solar energy utilization in CO 2 transformation.

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Enhanced thermoelectric performances in BiCuSeO oxyselenides via Er and 3D modulation doping

Cited by 30 publications

References 30 publications

Rational Electronic and Structural Designs Advance BiCuSeO Thermoelectrics

Rational Electronic and Structural Designs Advance BiCuSeO Thermoelectrics

Inorganic thermoelectric materials: A review

Enhanced CO₂ Reduction Performance of BiCuSeO‐Based Hybrid Catalysts by Synergetic Photo‐Thermoelectric Effect

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Enhanced thermoelectric performances in BiCuSeO oxyselenides via Er and 3D modulation doping

Cited by 30 publications

References 30 publications

Rational Electronic and Structural Designs Advance BiCuSeO Thermoelectrics

Rational Electronic and Structural Designs Advance BiCuSeO Thermoelectrics

Inorganic thermoelectric materials: A review

Enhanced CO2 Reduction Performance of BiCuSeO‐Based Hybrid Catalysts by Synergetic Photo‐Thermoelectric Effect

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Enhanced CO₂ Reduction Performance of BiCuSeO‐Based Hybrid Catalysts by Synergetic Photo‐Thermoelectric Effect