CRYSTENGCOMM
·
2018
·Vol. 20
·期 47
·7729-7738
·
IF 3.304
Heng Quan Yang,Yong Jin Chen,Xiao Yang Wang,Lei Miao,Xiao Yan Li,Xiao Dong Han,Xu Lu,Guo Yu Wang,Xiao Yuan Zhou
The rational design and fabrication of nanostructures has become a fashionable strategy for pursing high thermoelectric performance in solid-state materials. Here we report nanostructured Te–Sb2Te3 composites with significantly enhanced thermoelectric performance through a scalable bottom-up method followed by a rapid sintering process. The power factor along with the carrier concentration could be significantly enhanced by increasing the number of point defects of . Meanwhile, a great number of boundaries and hetero-interfaces between the Te and Sb2Te3 nanoparticles could play an important role in blocking phonons, resulting in the evident suppression of lattice thermal conductivity. Ultimately, a highest zT value close to 1.0 could be achieved at 623 K in samples with components of 2.6 mol% Sb2Te3 and 97.4 mol% Te. Such a peak zT value is comparable to that of doped Te materials synthesized by the conventional solid-state reaction process. This work reveals that high thermoelectric performance could be realized in an intentionally designed nanocomposite by synergistically improving the power factor and suppressing the lattice thermal conductivity.
研究领域:
材料科学
·
热电材料
·
纳米结构工程
·
固态物理
·
能源转换
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
·
2021
·Vol. 46
·期 5
·5963-5972
·
IF 5.164
Guoru Li,Xiaoting Yu,Fengxiang Yin,Zhiping Lei,Xinran Zhao,Xiaobo He,Zhichun Li
Summary To reduce the overpotential of electrocatalytic oxygen evolution reaction (OER) for high-efficiency water splitting, a series of 2 to 5 nm ultrafine spinel Co 3 O 4 nanoparticles (NPs) with varied amount of lattice-doped Te (XTe-Co 3 O 4 , X represents the nominal molar ratio Te/Co of 0, 2, 4, 6, 8%) as catalysts were prepared through a simple hydrothermal synthesis method. The 6%Te-Co 3 O 4 catalyst was optimized to obtain the overpotential as low as 313 mV at 10 mA cm −2 , a small Tafel slope of 75 mV dec −1 in 1 M KOH for OER, outperforming this series and many reported Co 3 O 4 -based catalysts. Te doping introduced lattice distortion and resulted in smaller size of Te-Co 3 O 4 NPs with enlarged surface area for more accessible active sites. Oxygen vacancies were created to modify the electronic structure, improve the active sites density, and decrease the kinetic energy barriers of XTe-Co 3 O 4 . The electronic conductivity of 6%Te-Co 3 O 4 was improved to accelerate the charge transfer efficiency. All these effects contributed to promoting the reaction kinetics and minimizing the OER overpotentials for high-performance electrocatalysis.
研究领域:
材料科学
·
电催化
·
能量转换
·
纳米材料
·
无机化学
✓ 已验证
DOI
高影响因子
PHYSICS LETTERS A
·
2019
·
IF 2.087
Manman Yang,Hongyu Zhu,Wencai Yi,Shangsheng Li,Meihua Hu,Qiang Hu,Baoli Du,Xiaobing Liu,Taichao Su
In this paper, p-type thermoelectric material Te–Se solid solutions have been successfully prepared by the high-pressure technique. The thermal conductivity of Te was depressed sharply by Se alloying. An extremely low thermal conductivity ∼0.27 W m −1 K −1 was obtained for Te alloyed with 15 mol% Se, which near the theoretical minimum, κ min . The bipolar diffusion effect of Te was suppressed by Se alloying due to the increased band gap, which lead to enhanced Seebeck coefficient and depressed bipolar diffusion thermal conductivity under high temperature. The maximum figure of merit, ZT of 0.37 at 480 K was obtained for Te alloyed with 5 mol% Se, which is about twice higher than that of pristine Te.
研究领域:
材料科学
·
物理学
✓ 已验证
产品关联
DOI
高影响因子
Journal of the American Chemical Society
·
2023
·
IF 15
Xuan Huang,Bingyan Xu,Jie Feng,Shengnan Hu,Wenjie Dou,Tang Yang,Changhong Zhan,Shangheng Liu,Yujin Ji,Youyong Li,Chih-Wen Pao,Zhiwei Hu,Qi Shao,Xiaoqing Huang
Phase regulation of noble metal-based nanomaterials provides a promising strategy for boosting the catalytic performance. However, realizing the continuous phase modulation in two-dimensional structures and unveiling the relevant structure-performance relationship remain significant challenges. In this work, we present the first example of continuous phase modulation in a library of Pd–Te hexagonal nanoplates (HNPs) from cubic-phase Pd4Te, rhombohedral-phase Pd20Te7, rhombohedral-phase Pd8Te3, and hexagonal-phase PdTe to hexagonal-phase PdTe2. Notably, the continuous phase regulation of the well-defined Pd–Te HNPs enables the successful modulation of the distance between adjacent Pd active sites, triggering an exciting way for tuning the relevant catalytic reactions intrinsically. The proof-of-concept oxygen reduction reaction (ORR) experiment shows a Pd–Pd distance-dependent ORR performance, where the hexagonal-phase PdTe HNPs present the best electrochemical performance in ORR (mass activity and specific activity of 1.02 A mg–1Pd and 1.83 mA cm–2Pd at 0.9 V vs RHE). Theoretical investigation reveals that the increased Pd–Pd distance relates to the weak *OH adsorption over Pd–Te HNPs, thus contributing to the remarkable ORR activity of PdTe HNPs. This work advances the phase-controlled synthesis of noble metal-based nanostructures, which gives huge impetus to the design of high-efficiency nanomaterials for diverse applications.
研究领域:
材料科学
·
电化学
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Catalysis
·
2023
·
IF 12.9
Ting-Ting Mao,Zhen Wei,Bing-Yu Liu,Yu-Jun Xu,Jun Cai,Yan-Xia Chen,Juan M. Feliu,Enrique Herrero
Te-modified platinum single-crystal surfaces in the [011̅] zone have been used as model electrocatalysts for oxygen reduction reaction (ORR). The results clearly show that (1) except for Pt(111), all other electrodes display enhanced ORR activity when Te is deposited on the surface; (2) the intrinsic ORR activity for Pt(hkl) decreases in the order of Pt(322) > Pt(755) > Pt(977) > Pt(111) > Pt(311) > Pt(100), while the enhancement factor for ORR with Te modification decreases in the order of Pt(100) > Pt(311) > Pt(977) > Pt(755) > Pt(322); (3) metallic Te and its charge transfer to Pt as well as the consequent lower d-band center and OHad binding energy are probably the reasons for the enhanced electrocatalysis for ORR with Te modification; and (4) the inhibition of Te at Pt(111) as well as the smaller extent for the enhancement of Te at Pt(S)-[n(111) × (100)] with longer terraces in the kinetic region for ORR are a result of partial oxidation of Te. The weaker electronic interaction of Te with the Pt substrate is probably the origin of its facile oxidation at lower potential. Our results imply that modification of Pt with species that can transfer electrons to Pt may be an efficient strategy to enhance the ORR activity.
研究领域:
电催化
·
材料科学
·
表面化学
·
能量转换
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2020
·Vol. 31
·期 19
·16332-16337
·
IF 2.22
Yu Ping,Zhou Li,Jia Zhengfu,Wu Keyue,Cui Jingbiao
Te nanoplates, nanowires, and nanospheres were successfully synthesized by a hydrothermal method with glucose as a surfactant agent. By simply changing the reaction time, the morphology of Te nanostructures can be changed from nanoplates, to nanowires, and ultimately to nanospheres. The samples were studied by x-ray diffraction, scanning electron microscopy, transmission electron microscopy, x-ray photoemission spectroscopy, and photoluminescence measurements. It is found that the reaction time plays an important role in morphology formation and optical properties of Te nanostructures. A possible growth mechanism involving a self-assembly process and Wulff facets theorem is proposed to explain the formation of Te nanoplates, nanowires, and nanospheres. This study presents a simple way to control the morphology of Te nanostructures and their optical properties.
研究领域:
材料科学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2019
·
IF 5.383
Fan Mingli,Li Xue,Wei Dandan,Wang Yinling,Li Maoguo
Transition metal chalcogenides are promising hydrogen evolution reaction (HER) electrocatalysts ; however, their performance still needs to be improved to meet the requirements of practical applications. Herein, an interface-engineering strategy is exploited to prepare efficient transition metal chalcogenide based HER catalysts in alkaline medium. Specifically, the heterogeneous nanostructure of 1D core-shell Te@NiTe 2 and 2D NiS (Te@NiTe 2 /NiS) has been fabricated by an easy one-step solvothermal method . The HER activity of Te@NiTe 2 /NiS is optimized by adjusting the ratio of raw materials and reaction time. Under the optimum conditions, the Te@NiTe 2 /NiS displays higher HER activity than individual Te@NiTe 2 and NiS in alkaline medium and the reasons are investigated in detail. To improve the HER activity of Te@NiTe 2 /NiS, the Te@NiTe 2 /NiS is further combined with conductive acetylene black (AB) by physically mixing. The resulting Te@NiTe 2 /NiS/AB has a low overpotential at 10 mA/cm 2 of 101 mV, higher current density than 20% Pt/C when the overpotential is larger than 0.37 V and good long-term stability, indicating its practicability as HER electrocatalysts. This work presents the validity of interface-engineering strategy in preparing highly efficient transition metal chalcogenides based HER electrocatalysts.
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CATALYSIS
·
2020
·
IF 7.888
Yaping Pan,Fawei Zheng,Xixi Wang,Hongye Qin,Enzuo Liu,Junwei Sha,Naiqin Zhao,Ping Zhang,Liying Ma
Hydrogen evolution reaction (HER) activities of WS 2 can be improved by doping exotic atom to increase active sites on base plane and narrow the bandgap. However, most of these catalysts of exotic atom doped WS 2 are composed of semiconductor and the electronegativity between atoms is similar, which do harm to tuning bandgap with a wide range and decreasing the value of free Gibbs energy (Δ G H ) for hydrogen adsorption. Given that Te can tune bandgap with a wide range and the electronegativity between S and Te differ greatly, a vertically arranged WS 2 nanoelectrode is prepared by doping Te on WS 2 . According to experimental studies and the density functional theory calculations (DFT), the bandgap of WS 2 nanosheets is successfully narrowed after doping Te. This lowers the Schottky barrier which benefits the transfer of charges and improves electrocatalytic performance in turn. Meanwhile, the presence of Te atoms with much lower electronegativity than S increases the electron density of the adjacent region, thereby the S edges of basal plane around Te atoms and hollow sites of WS 2 nanosheet become active to drive HER, which has been verified by the reduced Δ G H of S edges of basal plane from 2.27 to 2.08 eV and hollow sites from 2.28 to 1.85 eV after the doping in DFT. Te-doped WS 2 nanosheets used as excellent HER catalysts with an overpotential of 213 mV to drive a current density of 10 mA/cm 2 , a small Tafel slope of 94 mV/dec, along with a superior stability in acid media.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
International Journal of Minerals Metallurgy and Materials
·
2022
·Vol. 29
·期 4
·896-904
·
IF 3.85
Zhang Xuefeng,Jiao Shuqiang
Metal aluminum batteries (MABs) are considered potential large-scale energy storage devices because of their high energy density, resource abundance, low cost, safety, and environmental friendliness. Given their high electrical conductivity, high theoretical specific capacity, and high discharge potential, Te is considered a potential positive electrode material for MABs. Nonetheless, the critical issues induced by the chemical and electrochemical dissolution of tellurium and subsequent chemical precipitation on bare Al negative electrodes result in poor cycle stability and low discharge capacity of Al—Te batteries. Here an efficient TiB 2 -based modified layer has been proposed to address bare Al electrodes (Al/TB). Consequently, the low-voltage hysteresis and long cycle life of the Al/TB negative electrode have been achieved. In addition, the electrochemical performance of the Al—Te battery based on the Al/TB negative electrode is dramatically improved. Furthermore, the modified separator technology is introduced to match with the as-designed Al/TB negative electrode. Therefore, the record-setting long-term cycle stability of up to 500 cycles has been achieved in the Al—Te battery. The facile strategy also opens a potential route for other high-energy density battery systems, such as Al—S and Al—Se batteries.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Zhili Li,Jiye Zhang,Pengfei Luo,Jiayi Chen,Bowen Huang,Yuzhe Sun,Jun Luo
Silver chalcogenides demonstrate great potential as flexible thermoelectric materials due to their excellent ductility and tunable electrical and thermal transport properties. In this work, we report that the amorphous/crystalline phase ratio and thermoelectric properties of the Ag2SxTe1–x (x = 0.55–0.75) samples can be modified by altering the S content. The room-temperature power factor of the Ag2S0.55Te0.45 sample is 4.9 μW cm–1 K–2, and a higher power factor can be achieved by decreasing the carrier concentration as predicted by the single parabolic band model. The addition of a small amount of excessive Te into Ag2S0.55Te0.45 (Ag2S0.55Te0.45+y) not only enhances the power factor by decreasing the carrier concentration but also reduces the total thermal conductivity due to decreased electronic thermal conductivity. Owing to the effectively optimized carrier concentration, the thermoelectric power factor and dimensionless figure of merit zT of the sample with y = 0.007 reaches, respectively, 6.2 μW cm–1 K–2 and 0.39, while the excellent plastic deformability is well maintained, demonstrating its promising potential as a flexible thermoelectric material at room temperature.
研究领域:
材料科学
·
热电学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Nano Research
·
2023
·Vol. 16
·期 7
·9344-9351
·
IF 9.9
Zeng Zhichao,Shi Xiaomeng,Sun Mingzi,Zhang Hongtu,Luo Wei,Huang Yunhui,Huang Bolong,Du Yaping,Yan Chun-Hua
Rare-earth (RE) halide solid electrolytes (HSEs) have been an emerging research area due to their good electrochemical and mechanical properties for all-solid-state lithium batteries (ASSBs). However, only very limited types of HSEs have been reported with high performance. In this work, tens of grams of RE-HSE Li 3 TbBr 6 (LTbB) was synthesized by a vacuum evaporation-assisted method. The as-prepared LTbB displays a high ionic conductivity of 1.7 mS·cm −1 , a wide electrochemical window, and good formability. Accordingly, the assembled solid lithium-tellurium (Li-Te) battery based on the LTbB HSE exhibits excellent cycling stability up to 600 cycles, which is superior to most previous reports. The processes and the chemicals during the discharge/charge of Li-Te batteries have been studied by various in situ and ex situ characterizations. Theoretical calculations have demonstrated the dominant conductivity contributions of the direct [octahedral]-[octahedral] ([Oct]–[Oct]) pathway for Li ion migrations in the electrolyte. The Tb sites guarantee efficient electron transfer while the Li 2s orbitals are not affected during migration, leading to a low activation barrier. Therefore, this successful fabrication and application of LTbB have offered a highly competitive solution for solid electrolytes in ASSBs, indicating the great potential of RE-based HSEs in energy devices.
研究领域:
材料科学
·
能源存储与转换
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED MATERIALS
·
2023
·
IF 29.4
Yanzhou Chang,Jiarun Huang,Sujiang Shi,Ligeng Xu,Hao Lin,Tianfeng Chen
Facilely synthesized nanoradiosensitizers with well-controlled structure and multi-functionality are greatly desired to address the challenges of cancer radiotherapy. Herein, we develop a universal method for synthesizing chalcogen-based TeSe nanoheterojunctions with rod-, spindle- or dumbbell-like morphologies by engineering the surfactant and added selenite. Interestingly, dumbbell-shaped TeSe nanoheterojunctions (TeSe NDs) as chaperone exhibit better radio-sensitizing activities than the other two nanostructural shapes. Meanwhile, TeSe NDs can serve as cytotoxic chemodrugs that degraded to highly toxic metabolites in acidic environment and deplete GSH within tumor to facilitate radiotherapy. More importantly, the combination of TeSe NDs with radiotherapy significantly decreases regulatory T cells and M2-phenotype tumor-associated macrophage infiltrations within tumors to reshape the immunosuppressive microenvironment and induce robust T lymphocytes-mediated antitumor immunity, resulting in great abscopal effects on combating distant tumor progression. This study provides a universal method for preparing nanoheterojunction with well-controlled structure and developing nanoradiosensitizers to overcome the clinical challenges of cancer radiotherapy. This article is protected by copyright. All rights reserved
研究领域:
纳米技术
·
肿瘤学
·
放射治疗
·
免疫疗法
·
癌症生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）