Materials Horizons
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2017
·Vol. 4
·期 2
·274-280
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IF 10.706
Ke Zhang,Mingzeng Peng,Wei Wu,Junmeng Guo,Guoyun Gao,Yudong Liu,Jinzong Kou,Rongmei Wen,Ying Lei,Aifang Yu,Yang Zhang,Junyi Zhai,Zhong Lin Wang
Flexible functional devices based on two dimensional (2D) materials are extremely suitable for malleable, portable and sustainable applications, such as health monitoring, electronic skin and optoelectronics. In this work, we developed a flexible photodetector based on a p-CuO/n-MoS2 heterojunction with an enhancement in photocurrent and detection sensitivity. Because of the non-centrosymmetric structure in monolayer MoS2, the piezo-potential induced by applied strain adjusts the band structure at the heterojunction interface and broadens the depletion region based on the piezo-phototronic effect. The border depletion can be discreetly used to improve the photo-generated carrier separation and transport to enhance photoresponse performance. When illuminated by a 532 nm laser, the photocurrent of the heterojunction can be enhanced 27 times under a tensile strain of 0.65% compared to strain free conditions and the detection sensitivity can reach up to 3.27 × 108 Jones. As a result, our research provides a new strategy for novel design and performance optimization of 2D material heterostructures in the application of optoelectronics.
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JOURNAL OF PHYSICAL CHEMISTRY A
·
2017
·
IF 2.847
Jianqiang Zhu,Shuyan Wang,Narcisse T. Tsona,Xiaotong Jiang,Yifeng Wang,Maofa Ge,Lin Du
Rate constants at room temperature (293 ± 2 K) and atmospheric pressure for the reaction of methyl n-propyl ether (MnPE), CH3OCH2CH2CH3, with OH and NO3 radicals and the Cl atom have been determined in a 100 L FEP-Teflon reaction chamber in conjunction with gas chromatography-flame ionization detector (GC-FID) as the detection technique. The obtained rate constants k (in units of cm3 molecule–1 s–1) are (9.91 ± 2.30) × 10–12, (1.67 ± 0.32) × 10–15, and (2.52 ± 0.14) × 10–10 for reactions with OH, NO3, and Cl, respectively. The products of these reactions were investigated by gas chromatography-mass spectrometry (GC-MS), and formation mechanisms are proposed for the observed reaction products. Atmospheric lifetimes of the studied ether, calculated from rate constants of the different reactions, reveal that the dominant loss process for MnPE is its reaction with OH, while in coastal areas and in the marine boundary layer, MnPE loss by Cl reaction is also important.
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MATERIALS LETTERS
·
2015
·
IF 2.489
Shanshan Ji,Ye Lian,Jie Zhang,Peixia Yang,Jinqiu Zhang,Maozhong An
Stoichiometric Cu 1.00 In 0.51 Ga 0.1 Se 2.04 (CIGS) thin films containing Cu(II), In(III), Ga(III) and Se(IV) are obtained for the first time in ionic liquid/n-propyl alcohol mixtures with controlled pulse electrodeposition parameters at 323 K. The effects of deposition current density, deposition time , frequency and duty cycle are studied in detail. The band gap of obtained CuIn x Ga 1− x Se 2 (CIGS) thin film are approximately 1.35 eV, as measured using UV–visible absorption spectra . The interplanar spacing and average Hall coefficient of the CIGS thin films are approximately 3.315 Å and 1.011×10 −1 cm 3 /C, respectively.
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DALTON TRANSACTIONS
·
2018
·Vol. 47
·期 44
·15957-15966
·
IF 4.099
Tingting Chen,Hongchao Wang,Wenbin Su,Fahad Mehmood,Teng Wang,Jinze Zhai,Xue Wang,Chunlei Wang
High figures of merit of n-type Pb1−xBixTe alloys have been achieved by rapid synthesis at low temperature. The effects of Bi dopant and microwave hydrothermal technology on microstructure and thermoelectric performance have been studied. The solid solubility limit of Bi in PbTe is between x = 0.02 and 0.03. Homogenous nanopowders of about 70 nm have been synthesized by the microwave hydrothermal method. When followed by hot pressing, sub-microscale grain sizes are also formed for Pb1−xBixTe alloys. With increase in Bi, the carrier concentration is improved within the solubility limit. This leads to low electrical resistivity and higher power factor at high temperature. A higher power factor of 8.5 μW cm−1 K−2 is obtained for x = 0.02 sample at 623 K. In addition, the introduction of Bi effectively prohibits the p–n transition and bipolar thermal conductivity of pristine PbTe. Thus, a low lattice thermal conductivity of 0.68 W m−1 K−1 is achieved at 673 K, combining scattering of alloys, grain boundaries, dislocations and defects. As a result, the highest peak figure of merit, i.e., zT = 0.62 at 673 K is achieved for Pb0.98Bi0.02Te sample, which is comparable with that of Bi-doped PbTe alloys synthesized by the conventional melting method. Thus, the right synthesis conditions of the microwave hydrothermal method can rapidly result in thermoelectric materials with comparable figures of merit.
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CARBON
·
2020
·
IF 8.821
Zhichao Miao,Jian Meng,Manfen Liang,Zhenbin Li,Yuzhen Zhao,Fangyuan Wang,Leilei Xu,Jinglin Mu,Shuping Zhuo,Jin Zhou
For the electro-reduction of CO 2 to syngas , the fabrication of electrodes with excellent and adjustable catalytic performance is a critical step. In this work, Ni particles encapsulated in N-doped carbon nanotubes on carbon paper (Ni@N-CNTs/CP) composites were designed and prepared via an in-situ chemical vapor deposition method. As confirmed by different characterization techniques, the Ni@N-CNTs are successfully synthesized, and the surface of the CP is evenly covered by the Ni@N-CNTs. The effects of Ni content and treating temperature on the textural properties of composites are carefully investigated. The Ni@N-CNTs/CP composites are directly employed as the electrode for electro-reduction of CO 2 , and the action mechanisms of the N species, Ni particles, and N-CNTs structure are explored as well. The electrode exhibits excellent catalytic activity and high stability, reaching a specific current of 10 mA cm −2 . The H 2 /CO ratio in the achieved syngas can be tuned in the range of 5/1 to 1/1.5.
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JOURNAL OF SOLUTION CHEMISTRY
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2017
·Vol. 46
·期 5
·1048-1058
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IF 1.342
Li Qiang,Liu Bijun,Tian Yin,Yu Qianhong,Mu Wanjun,Wei Hongyuan,Wang Dongqi,Li Xingliang,Luo Shunzhong
N -(phosphonomethyl)- l -proline is an analogue of glyphosate. The protonation for N -(phosphonomethyl)- l -proline was studied by potentiometry, calorimetry, 31 P NMR spectroscopy and quantum chemical calculations to further understand the protonation process of glyphosate. The results confirmed that the order of successive protonation sites of totally deprotonated N -(phosphonomethyl)- l -proline are a phosphonate oxygen, amino nitrogen, and finally the carboxylate oxygen. The results can improve the understanding of the biological activity of these types of molecules in solution.
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Nano Energy
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2017
·
IF 12.343
Xueping Liu,Tongle Bu,Jing Li,Jiang He,Tianhui Li,Jun Zhang,Wangnan Li,Zhiliang Ku,Yong Peng,Fuzhi Huang,Yi-Bing Cheng,Jie Zhong
Perovskite solar cell (PSC) has drawn widespread concern for its high efficiency and facile low-temperature solution fabrication, promising for the alternative low-cost photovoltaic energy. However, before commercializing, the problems regarding to the environmental stability and electrical hysteresis of PSCs still need to be tackled. We present a simple route by stacking n-type materials TiO 2 (spray pyrolysis) and SnO 2 (aqueous colloidal) for planar devices, and achieve a stable (~91% efficiency >90 days at 30%RH without encapsulation), hysteresis-free (hysteresis index 0.004) and efficient (18.03%) perovskite solar cells. Moreover, we carry out a system stability evaluation for unsealed devices under harsh conditions with intense UV illumination, heat and damp in an environmental chamber . Both TiO 2 and SnO 2 devices demonstrate inferior performance compare to the stacked samples in the accelerated stability tests. Photoluminescence , phase and electrical characterizations suggest that the performance enhancement is ascribed to the synergetic optimization from concealing the defective interface and promotion of carriers transfer and blocking. With the optimized n-type layers, a high efficiency of 14.39% is obtained for the 5 × 5 cm 2 sub-module. These results suggest that by stacking n-type layers could enable superior overall performances to common electron transport layers (ETLs) (TiO 2 , SnO 2 and etc.), providing facile routes for fabricating efficient PSCs with high stability.
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Materials Science and Engineering B-Advanced Functional Solid-State Materials
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2023
·
IF 3.6
Wen Ding,Xiaozhong Wu,Zhichao Miao,Jin Zhou,Shuping Zhuo
As an inexpensive and renewable anode material with the advantages of less intercalation-induced exfoliation, superior molecularly doping performance, and outstanding rate capacity, hard carbon material attracts extensive attention in lithium-ion batteries (LIBs) and potassium-ion batteries (KIBs). In this work, a series of glucosamine hard carbon microspheres (GCMs) are synthesized through facile and inexpensive hydrothermal and pyrolysis procedures. The obtained hard carbon microspheres as anode material provide favorable dual functionality for both LIBs and KIBs. The electrochemical performance of GCMs electrodes at various carbonation temperatures is fully evaluated. The as-prepared GCM-900 is an admirable anode for LIBs, with good reversible capacity (407.8 mAh/g at 0.1 A/g after 200 cycles) and rate performance. Correspondingly, the GCM-1100 is good for KIBs (269.9 mAh/g at 0.05 A/g and 161.9 mAh/g after 100 cycles at 0.1 A/g).
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ACS Applied Energy Materials
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2022
·
IF 6.959
Xiaorong Fang,Pu Cheng,Kai Sun,Yujun Fu,Dequan Liu,Deyan He
Lithium–sulfur (Li–S) batteries have aroused extensive attention owing to the high theoretical capacity and energy density; however, their practical applications are impeded by the insulation of sulfur and lithium sulfides and the shuttle effect of lithium polysulfides (LiPSs). Here, zinc–nitrogen codoped carbon (ZnNC) nanofibers with pea-shaped voids were fabricated as an interlayer of Li–S batteries. It was found that the ZnNC nanofibers can anchor LiPSs and catalyze their redox conversion effectively. The cross-linked ZnNC nanofiber interlayer acting as an upper current collector can enhance the electron transfer and accelerate the lithium ion diffusion. The combined effects of the addition of the ZnNC nanofiber interlayer endow the Li–S batteries with high capacity, high-rate performance, and long cycle stability. The initial capacity is 1198.5 mAh g–1 at 0.5 C for the cell with a sulfur loading of about 1.0 mg cm–2. After 500 cycles at 1 C, a capacity of 694.1 mAh g–1 is retained with a low capacity fading of 0.073% per cycle. When the sulfur loading is 6.19 mg cm–2, the capacity reaches 754.8 mAh g–1 after 100 cycles at 0.2 C.
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ACS Sustainable Chemistry & Engineering
·
2018
·
IF 6.14
Lijun Yan,Di Li,Tingting Yan,Guorong Chen,Liyi Shi,Zhongxun An,Dengsong Zhang
Due to the wide application of carbon-based materials in supercapacitors, the concern of volumetric capacitance becomes increasingly important. In this work, the N,P,S-codoped hierarchically porous carbon spheres (N,P,S-HCS) have been rationally designed and originally fabricated using the silica colloids as hard templates, polyaniline as carbon and nitrogen sources, phytic acid as phosphorus sources, and ammonium persulfate as sulfur sources. Both high volumetric and gravimetric capacitance can be achieved. The as-prepared N,P,S-HCS shows the highest specific capacitance of 274 F g–1 and 219 F cm–3 at a current density of 0.5 A g–1, which reveals a superior performance. Moreover, the cycling ability of the N,P,S-HCS can be maintained over 95% to the initial capacitance at a high current density of 10 A g–1 for 10 000 charge–discharge cycles. This is mainly contributed to the uniform doping of N, P, and S as well as the hierarchically porous structure of the N,P,S-HCS. Finally, we assemble it into the all-solid-state symmetric supercapacitors with high energy and power densities of 3.4 W h L–1 with 804 W L–1, respectively. The N,P,S-codoped hierarchically porous carbon spheres with high density show both good volumetric and gravimetric capacitance, which make it a promising material for supercapacitors in practical applications. The present investigations may develop a new direction for the design of carbon materials for a good balance of both high gravimetric and volumetric capacitance.
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JOURNAL OF ELECTRONIC MATERIALS
·
2022
·Vol. 51
·期 4
·1591-1596
·
IF 2.047
Zhu Wenyan,Fang Wenqiang,Zou Jiahao,Zhu Shengjie,Si Jianxiao
n- type Mg 3 Sb 2 -based material is a promising thermoelectric material with less toxicity and more abundance. Herein, we successfully synthesized n- type polycrystalline Mg 3.5- x In x Sb 1.7 Bi 0.26 Te 0.04 ( x = 0, 0.01, 0.02, 0.03, 0.04) samples by rapid induction melting and hot pressing. The effect of indium doping on the thermoelectric properties of Mg 3 Sb 2 -based materials was investigated. Indium doping manipulates the grain boundary scattering, resulting in increased electrical conductivity and carrier mobility. Additionally, the lattice disorder induced by In strengthens the phonon scattering and suppresses lattice thermal conductivity. A peak ZT value of 1.27 is obtained at 773 K in the Mg 3.47 In 0.03 Sb 1.7 Bi 0.26 Te 0.04 sample, which is 26% higher than that of the In-free sample. Our work indicates that indium is an alternative metal addition to improve mobility and thermoelectric performance.
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Materials Today Communications
·
2024
·
IF 3.7
Qian Luo,Runyu Wang,Kai Lu,Hang Liu,Guocai Yuan,Juncheng Ding,Xiaobo Lei,Ruonan Min,Qinyong Zhang,Lihong Huang
PbSe has attracted significant attention as a medium-temperature thermoelectric (TE) material due to its abundance and low cost. This study demonstrate that in the novel thermoelectric system of Al x Pb 0.9975 Sb 0.0025 Se samples ( x = 0, 0.005, 0.01, 0.02, and 0.03), the electronic conductivity of pure PbSe was enhanced by Sb doping. Introducing a small amount of Al to occupy the Pb vacancies not only increases the Hall carrier concentration in PbSe, but also resulting in an increase in Seebeck coefficient ( S ). At 873 K, the power factor ( PF ) of the sample with x = 0.02 increases to 16 μW cm −1 K −2 . In addition, the total thermal conductivity did not increase significantly, so the thermoelectric performance was effectively improved, a maximum figure of merit ( ZT ) of 1.8 is achieved at 873 K, along with a high average ZT ( ZT avg ) of approximately 1 over the temperature range of 300–873 K.
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危险品化学品经营许可证（带存储）