APPLIED SURFACE SCIENCE
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2020
·
IF 6.182
Lu Yue,Maleraju Jayapal,Xinli Cheng,Tingting Zhang,Junfeng Chen,Xiaoyan Ma,Xin Dai,Haiqin Lu,Rongfeng Guan,WenHui Zhang
High theoretical capacity and low discharge platforms of Sn and Sb-based materials are an auspicious anode material for sodium ion batteries. Although, their large volume change before and after sodium insertion during cycling leads to unstable electrode structure and poor cycle performance. In view of the above, a thermo chemical strategy by a simple one-pot for producing 3–6 nm diameter homogeneously dispersed Sn/SnSb nanoparticles on a nitrogen-doped graphene sheet with a large-scale and low-cost feature for high performance sodium ion battery is reported. Highly dispersed nano Sn-SnSb alloy/graphene composite electrode not only had good stress adaptability and good integrity protection to prevent agglomeration and polarization during cycling, and also provided the rapid Na + diffusion and electronic transfer channels, thus showing high rate and ultra-stable cycle performance. The as-prepared electrode could maintain the super stable reversible capacities of 251.8, 146.2 and 60.2 mAh g −1 at 1, 4 and 10 A g −1 over 1000 cycles, respectively.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2020
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IF 4.65
Xiangju Chen,Yang Hong,Xiaoli Ge,Caixia Li,Xianguang Miao,Peng Wang,Zhiwei Zhang,Longwei Yin
Taking advantage of nano-sized active materials, doping and self-supporting, Se-doped Bi 2 S 3 /3D carbon foam (Bi 2 S 3-x Se x /CF) is synthesized through a pyrolysing-hydrothermal-heating three-steps process. The as-synthesized Bi 2 S 3-x Se x /CF hybrid exhibits a significant improvement in electrochemical performance, showing a high specific capacity of 441.8 mAh g −1 after 100 cycles with the coulombic efficiency approximating to 100%. The special nanoneedle-like structure of Bi 2 S 3 makes for shortening ion transmission distance, minishing the mechanical stress and thus improving the electrochemical performance. And the introduction of Se can enhance the specific capacity, cycling stability and rate performance by improving of electronic conductivity and forming Se-contained inactive phase during alloying process. Furthermore, the self-supporting electrode is beneficial to simplify preparation process and reduce the loss of volume energy density . The strategy presented in this paper to improve the electrochemical performance of secondary ions battery can be also applied to other novel electrodes materials.
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Advanced Science
·
2020
·Vol. 7
·期 11
·1903493
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IF 15.84
Sihui Li,Jiwu Xin,Abdul Basit,Qiang Long,Suwei Li,Qinghui Jiang,Yubo Luo,Junyou Yang
Lead-free chalcogenide SnTe has been demonstrated to be an efficient medium temperature thermoelectric (TE) material. However, high intrinsic Sn vacancies as well as high thermal conductivity devalue its performance. Here, β-Zn 4 Sb 3 is incorporated into the SnTe matrix to regulate the thermoelectric performance of SnTe. Sequential in situ reactions take place between the β-Zn 4 Sb 3 additive and SnTe matrix, and an interesting “core–shell” microstructure (Sb@ZnTe) is obtained; the composition of SnTe matrix is also tuned and thus Sn vacancies are compensated effectively. Benefitting from the synergistic effect of the in situ reactions, an ultralow κ lat ≈0.48 W m −1 K −1 at 873 K is obtained and the carrier concentrations and electrical properties are also improved successfully. Finally, a maximum ZT ≈1.32, which increases by ≈220% over the pristine SnTe, is achieved in the SnTe-1.5% β-Zn 4 Sb 3 sample at 873 K. This work provides a new strategy to regulate the TE performance of SnTe and also offers a new insight to other related thermoelectric materials.
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Journal of Energy Chemistry
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2020
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IF 7.216
Xiao Liu,Peijie Fan,Liangping Xiao,Jian Weng,Qingchi Xu,Jun Xu
The generation of green hydrogen (H 2 ) energy is of great significance to solve worldwide energy and environmental issues. Reduced Ti based photocatalyst has recently attracted intensive attention due to its excellent photocatalytic activity, while the synthesis of reduced Ti based photocatalysts with high stability is still a great challenge. Here, we report a facile method for synthesis of reduced Ti metal organic frameworks (small amounts of Pt incorporated) encapsulated BP (BP/R-Ti-MOFs/Pt) hybrid nanomaterial with enhanced photocatalytic activity. The strong interaction between Ti and P reduces the valence state of the binding Ti 4+ on the BP surface, forming abundant reduced Ti 4+ within R-Ti-MOFs/BP. Such reduced Ti 4+ render R-Ti-MOFs/BP efficient charge transfer and excellent light absorption capability, thus promote the photocatalytic H 2 production efficiency. Furthermore, the Ti-P interaction stabilizes both reduced Ti 4+ and BP during the photocatalytic reaction, which greatly enhanced the stability of the obtained BP/R-Ti-MOFs/Pt photocatalyst.
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Materials Today Energy
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2020
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IF 5.604
Jun Xu,Rixin Wang,Xing Chen,Ru Zhou,Junjun Zhang
Copper-containing bimetallic sulfides are regarded as an emerging low-cost catalyst for electrocatalytic hydrogen generation. In this work, we report for the first time the ternary Cu 2 SnS 3 (CTS) nanocrystals anchored reduced graphene oxide (rGO) nanosheets (CTS@rGO) as a superior electrocatalyst for efficient hydrogen generation. The CTS nanocrystals with 5–10 nm are much homogeneously distributed on the surface of rGO nanosheets. In the CTS@rGO composite, the rGO works as a robust scaffold that can effectively suppress aggregation of the CTS nanocrystals and ensure more exposed active sites on CTS surfaces. Furthermore, the conductive rGO is beneficial to fast charge transfer. Therefore, the CTS@rGO catalyst possesses a large electrocatalytic active surface area and a small charge transfer resistance. As a result, the CTS@rGO exhibits significantly enhanced catalytic activity for hydrogen evolution reaction (HER) in both the acid and alkaline electrolytes in comparison with the pristine CTS nanocrystals. The CTS@rGO delivers a striking catalytic kinetic metrics of a small Tafel slope of 54 mV dec −1 , a low overpotential of 252 mV at a current density of 10 mA cm −2 , long operation stability of 4 day in the acid electrolyte.
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JOURNAL OF WUHAN UNIVERSITY OF TECHNOLOGY-MATERIALS SCIENCE EDITION
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2020
·Vol. 35
·期 2
·272-279
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IF 0.64
Li Zhi,Shen Wenjian,Zhao Juan,Ying Hangkai,Wu Zhengli,Liu Yifan,Li Wangnan,Ku Zhiliang,Peng Yong,Huang Fuzhi,Cheng Yibing,Zhong Jie,Fu Zhengyi
A novel aqueous Sn-S complex solution was applied as precursor to fabricate SnO 2 electron selective layers (ESLs) for the hybrid perovskite solar cells (PSCs). The tin and sulfur powder were directly dissolved in a (NH 4 ) 2 S water solution to form Sn-S precursor. After depositon and annealing, the SnO 2 film was formed, presenting as a low cost and enviromental friendly method for preparation of ESL. The films showed excellent transmittance at visible wavelength range. Moreover, the method exhibited high compatibility for doping using Cu, Cd, Li, and Zn elements. Zn doping (0.05 M) in the as-prepared SnO 2 ESL significantly improved perovskite solar cells (PSCs) performance. The highest PCE of 13.17% was achived with 15% enhancement compared to that of undoped SnO 2 ESL samples. TiCl 4 modifications on SnO 2 film improved photovoltaic performance to 14.45%, but resulted in the poor long-term stability, around 80% more degredation than that of PSCs based on Zn-doped SnO 2 films.
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GREEN CHEMISTRY
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2020
·Vol. 22
·期 11
·3597-3607
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IF 9.48
Hai-Qin Xiao,Wen-Hui Zhou,Dong-Xing Kou,Zheng-Ji Zhou,Yue-Na Meng,Ya-Fang Qi,Sheng-Jie Yuan,Qing-Wen Tian,Si-Xin Wu
Cu2ZnSn(S,Se)4 (CZTSSe) solar cells have been receiving considerable attention in recent years, owing to their low cost and toxicity as well as a high abundance of their constituent elements. Solution-based (mainly precursor solution) methods have been widely used in the fabrication of CZTSSe-based thin film solar cells. Though most record solar cells since 2009 have been achieved using solution-based methods, carbonaceous residues are always formed during post deposition treatment (PDT). These carbonaceous residues are detrimental to grain growth of CZTSSe to form large grains. The presence of unwanted small grain layers will increase the series resistance and reduce the fill factor of the solar cell, thus consequently decreasing the efficiency of CZTSSe solar cells. Herein, we propose “green” supercritical carbon dioxide (SCCO2) treatment to overcome the challenge of carbonaceous residues. FT-IR, SEM, XRD and Raman characterization studies were used to confirm the reduction of carbonaceous residues in CZTSSe films. The solar cell fabricated from a selenized CZTSSe precursor film with SCCO2 treatment under optimal conditions showed the best conversion efficiency of 11.23% (VOC = 0.456 V, JSC = 36.6 mA cm−2, FF = 67.1%). To the best of our knowledge, this is the first report on boosting the efficiency of solution-based CZTSSe solar cells by using SCCO2 treatment. In addition, this unique SCCO2 treatment may also bring forth new ideas for other solution-based optoelectronic devices.
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Nano Energy
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2020
·
IF 16.602
Yufei Gu,Xiaojiang Mu,Pengfei Wang,Xiaoyang Wang,Jing Liu,Jiaqi Shi,Anyun Wei,Yongzhi Tian,Guisheng Zhu,Huarui Xu,Jianhua Zhou,Lei Miao
Highly efficient solar steam generation (SSG) relies on excellent light absorption, adequate water transportation , a large evaporation area, and high thermal management capability in coherent photothermal materials. However, there is not yet a general means of integrating these functions on a monolith with design flexibility in chemical compositions and pore structure . Here, we design and demonstrate a versatile chitosan (CS) aerogel that is easily compatible with other photothermal materials for high-efficiency SSG. The CS aerogel was synthesized through liquid-phase one-pot freeze drying without any cross-linkers. CS composite aerogels not only preserved the initial characteristics of the CS aerogel but also integrated biocompatible, hydrophilic and high thermal insulation properties, as well as enhanced light absorption ability based on the designed porous structure through the effects of light trapping and multiple scattering. Carbonized pomelo peel particles composited with the CS aerogel and freeze dried by lyophilizer (PP 0.1 CS 1.5 -L) exhibited excellent SSG performance with an evaporation rate of up to 1.78 kg m −2 h −1 , which is far beyond that attainable by two-dimensional SSG systems under normal solar irradiation of 1 kW m −2 . This research opens up a new avenue for the facile fabrication of reusable, low-cost, nontoxic, and high-performance functional aerogels.
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CHEMICAL ENGINEERING JOURNAL
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2020
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IF 10.652
Yuanyuan Li,Pengcheng Feng,Cong Wang,Wenjun Miao,He Huang
The severe issues facing conventional therapies for triple negative breast cancer (TNBC), such as poor response rate and side effects, calls for new strategies to realize better prognosis. Owing to the merits of good efficacy, safety and facile implementation, phototherapy represents an attractive modality for this goal. Black phosphorus (BP) is a class of novel interesting materials for biomedical uses with advantages of biodegradability and optical activity. However, its stability, safety and biological performance remained to be further optimized. In this work, we report a novel light-responsive nanosystem, named [email protected] , for fluorescence imaging-guided synergistic photothermal and photodynamic therapy (PTT/PDT) against TNBC. Hyaluronic acid was coated onto NIR dye(cypate)-loaded BPN, resulting in favorable stability, excellent delivery efficiency into tumor cells and photothermal and photodynamic potential. Importantly, the safety profile of HBPN was greatly improved, compared to the counterpart without HA coating. Following NIR irradiation, localized generation of singlet oxygen and hyperthermia by [email protected] had a significant antitumor effect against both 4T1 cell monolayers and 3D organoids in vitro . Additionally, [email protected] showed significantly enhanced accumulation in tumor tissue and subsequently promoted light-triggered tumor ablation in a mouse model of TNBC. Taken together, this study demonstrates that novel nanophototherapeutics with great stability and safety profile such as [email protected] represent a promising platform for imaging-guided phototherapy for breast cancer treatment.
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ACS Applied Nano Materials
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2020
·
IF 0
He Tian,Xiancheng Meng,Juehan Yang,Chao Fan,Shuo Yuan,Xia An,Chun Sun,Yonghui Zhang,Mengjun Wang,Hongxing Zheng,Zhongming Wei,Erping Li
Two-dimensional (2D) nanomaterials have been attracting intensive interest due to their unique physical and optoelectronic properties. Van der Waals nanolayered heterostructures based on different 2D nanomaterials provide a state-of-the-art platform for investigating the physical phenomena and have extended the applications of 2D nanomaterials, leading to an era of next-generation high-performance electronic and optoelectronic technology. Herein, vertical 2D SnS/SnS2 p–n and SnSe2/SnS2 n–n nanolayered heterostructures are constructed by exfoliating individual materials and stacking them artificially. The two types of back-gate field-effect phototransistors show clear rectifying behaviors with the existence of band offset and excellent optoelectronic performances. The SnS/SnS2 p–n nanolayered heterostructure shows an ambipolar behavior with a hole mobility of 6.96 cm2·V–1·s–1 and electron mobility of 0.68 cm2·V–1·s–1, while the SnSe2/SnS2 n–n nanolayered heterostructure shows an intense n-type behavior with electron mobility of 3.78 cm2·V–1·s–1 and a high on/off ratio of over 105. Interestingly, due to the band alignments and built-in potentials in the two types of nanolayered heterostructures, the phototransistors exhibit enhanced responsive performances to illuminations of three-primary-color lasers (λ = 405, 532, and 650 nm) compared to the individual components. The SnS/SnS2 phototransistor shows a high photoresponsivity of 3567 A W–1, a high detectivity of 3.64 × 1013 Jones, and a fast response time of 0.8 ms. The SnSe2/SnS2 phototransistor also exhibits a high photoresponsivity of 1793 A W–1 and a fast response time of 15.4 ms.
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ACS Applied Energy Materials
·
2020
·
IF 4.473
Jiaxing Ouyang,Yingming Wang,Nian Wu,Gongwei Wang,Li Xiao,Juntao Lu,Lin Zhuang
Metallic tin (Sn) has always been considered as an anode candidate for nonaqueous lithium-ion batteries (LIBs). Nevertheless, there were hardly any attempts to use Sn as an anode material in aqueous batteries. Although Sn possesses relatively high specific capacity (451.54 mAh/g, two-electron transfer reaction), mild electrode potential (−0.1375 V vs the standard hydrogen electrode, Sn2+ + 2e– = Sn), high hydrogen overpotential, and environmental friendliness, it also suffers from bad reversibility and low Coulombic efficiency (CE) in common aqueous electrolytes. In this work, a dendrite-free Sn anode with highly improved reversibility in an aqueous electrolyte was realized using a type of “water-in-salt” electrolyte (1 m Sn(OTf)2 + 20 m LiTFSI). The results of Fourier transform infrared (FTIR) spectra and density functional theory (DFT) calculations have verified the significant impact of highly concentrated LiTFSI salt on Sn2+ hydrolysis, which is the key factor in improving the reversibility of the Sn anode and suppressing the dendrite formation. A Sn/LiFePO4 cell applying this electrolyte was acquired with a discharge plateau at around 0.6 V. In the cyclability test, the Sn anode exhibited a stable discharge capacity of more than 107 mAh/g with a Coulombic efficiency (CE) of 95% for 35 cycles (0.2C rate).
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ACS Applied Materials & Interfaces
·
2020
·
IF 8.758
Qinghui Jiang,Huishan Hu,Junyou Yang,Jiwu Xin,Sihui Li,Giuseppe Viola,Haixue Yan
SnTe has attracted considerable attention as an environmentally friendly thermoelectric material. The thermoelectric figure of merit ZT value is related to low thermal conductivity that can be successfully realized using fabrication of nanostructures. However, the practical realization of SnTe nanostructured composites is often limited by long reaction time, low yield, and aggregation of nanoparticles. Herein, a simple substitution reaction between Cu2Se and SnTe was adopted to realize Cu1.75Te-SnTe nanocomposites with unique all-scale hierarchical structures. On the atomic level, the substitution SeTe is introduced into the lattice via the reaction between Cu2Se and SnTe; on the nanoscopic level, Cu1.75Te nanoinclusions with 10 nm size are evenly distributed at the grain boundaries of SnTe with average grain size less than 1 μm; on the mesoscopic level, these SnTe grains stack up to larger particles (10–20 μm), which are further surrounded by Cu1.75Te grains with a predominant size of 1–2 μm. These hierarchical structures, together with additional SnTe stacking faults, can effectively scatter phonons with different wavelengths to reduce the lattice thermal conductivity. At 873 K, a thermal conductivity value of 0.49 W·m–1·K–1 was obtained in the SnTe nanocomposite sample with 0.057 Cu1.75Te molar content, which is 40% lower than that of the pristine SnTe. By using the same approach for scattering phonons across integrated length scales, a ZT value of 1.02 (∼80% enhancement, compared with that of the pristine SnTe) was achieved at 873 K for the sample of the SnTe nanocomposite with 0.034 Cu1.75Te molar content. This large increase in ZT values highlights the role of multiscale hierarchical architecture in controlling phonon scattering, offering a viable alternative to realize higher performance thermoelectric bulk materials.
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