Journal of Materials Chemistry A
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2021
·Vol. 9
·期 11
·7248-7256
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IF 12.732
Peijia Wang,Jiajie Huang,Jing Zhang,Liang Wang,Peiheng Sun,Yefeng Yang,Zhujun Yao
Transition metal selenides have emerged as a class of promising anodes for sodium ion batteries (SIBs). However, the notorious issues of their low electrical conductivity and huge volume changes during sodium ion insertion/extraction lead to poor cycling stability and inferior rate capability. In this work, hierarchically core–branched iron cobalt selenide arrays coated with N-doped carbon shell (denoted as FeCo–Se@NC) were rationally designed and synthesized on carbon cloth through a combined strategy of hydrothermal, selenization and carbonization processes. Benefitting from the designed arrays with simultaneous Fe doping into the CoSe2 matrix and N-doped carbon coating, the optimized FeCo–Se@NC electrode possesses greatly enhanced structural integrity and accelerated ion/electron transfer kinetics. When employed as a binder- and additive-free anode for SIBs, the FeCo–Se@NC electrode exhibits a high reversible capacity of 532.1 mA h g−1 at 0.05 A g−1, competitive rate capability (193.3 mA h g−1 at 5 A g−1), and good cycling stability (386.1 mA h g−1 after 150 cycles at 0.5 A g−1). Moreover, when coupled with Na3V2(PO4)3/C, the full cell delivers a high capacity of 350.6 mA h g−1 at 0.1 A g−1 and a high energy density of 276.7 W h kg−1. This work is expected to provide a new avenue for the development of arrayed transition metal selenide-based materials for high-performance SIBs.
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Advanced Composites and Hybrid Materials
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2021
·Vol. 4
·期 2
·392-400
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IF 5.693
Zeng Xiangyang,Luo Qiang,Li Jinyang,Li Yilan,Wang Wei,Li Yunhong,Wu Ronggen,Pan Duo,Song Gang,Li Jianbao,Guo Zhanhu,Wang Ning
Counter electrode at the cathode side of sensitized solar cells (SSCs) plays a critical key role in determining the device performance. Active and stable counter electrodes that can work over a wide range of electrolyte systems are highly desired for SSCs. Here, we report a mixed ternary pentlandite, Ni 3 Co 6 S 8 , as an efficient multifunctional counter electrode for SSCs with various redox mediators (I 3 − /I − , T 2 /T − , Co(bpy) 3 3+/2+ and S n 2− /S 2− ). Ni 3 Co 6 S 8 shows not only similar catalytic activity to Pt for I 3 − /I − redox shuttle but also superior catalytic activity for T 2 /T − , Co(bpy) 3 3+/2+ , and S n 2− /S 2− redox mediators. Furthermore, SSCs assembled with Ni 3 Co 6 S 8 also exhibit good performance preservation in conjunction with various electrolyte systems. This work highlights that SSCs are fully compatible with pentlandites and paves the way towards the realization of high efficiency and stable SSCs. Graphical abstract Ni 3 Co 6 S 8 demonstrates excellent catalytic activity towards various redox mediators, highlighting the full compatibility of pentlandites with sensitized solar cells.
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Journal of Materials Chemistry C
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2021
·Vol. 9
·期 27
·8659-8665
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IF 7.393
Ya-Nan Li,Zi-Xia Chen,Wen-Dong Yao,Ru-Ling Tang,Sheng-Ping Guo
Metal chalcogenides are charming candidates for nonlinear optical (NLO) materials due to their multiple functional structural units and large polarizability. Here, isostructural Sn-based chalcogenides BaZnSnQ4 (Q = S, Se) were successfully synthesized based on the idea of heterovalent cations co-substitution of the Ga site in the parent BaGa2Se4. They crystallize in an orthorhombic system with polar space group Fdd2. Their structures are built by the NLO functional motifs ZnQ4 and SnQ4 tetrahedra. BaZnSnS4 (1) and BaZnSnSe4 (2) exhibit good SHG effects (0.6 and 1.0 times than that of AgGaS2) and also show type-I phase-matchable behaviors. In addition, their laser-induced damage thresholds are about 9.8 and 5.7 times higher than that of AgGaS2, respectively. BaZnSnS4 possesses a larger bandgap (3.25 eV) among the quaternary chalcogenide AMIIMIVQ4 (A = Sr, Ba; MII = Zn, Cd, Hg; MIV = Si, Ge, Sn; Q = S, Se) system. On the basis of theoretical calculation result, the source of SHG responses can be assigned to the synergetic effect of large distorted tetrahedral units. The achievement of this work provides a route to obtain new infrared NLO materials.
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Nano Research
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2021
·Vol. 15
·期 1
·304-309
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IF 8.897
Zhang Longcheng,Liang Jie,Yue Luchao,Xu Zhaoquan,Dong Kai,Liu Qian,Luo Yonglan,Li Tingshuai,Cheng Xiaohong,Cui Guanwei,Tang Bo,Alshehri Abdulmohsen Ali,Alzahrani Khalid Ahmed,Guo Xiaodong,Sun Xuping
Electrocatalytic oxygen reduction reaction (ORR) provides an attractive alternative to anthraquinone process for H 2 O 2 synthesis. Rational design of earth-abundant electrocatalysts for H 2 O 2 synthesis via a two-electron ORR process in acids is attractive but still very challenging. In this work, we report that nitrogen-doped carbon nanotubes as a multi-functional support for CoSe 2 nanoparticles not only keep CoSe 2 nanoparticles well dispersed but alter the crystal structure, which in turn improves the overall catalytic behaviors and thereby renders high O 2 -to-H 2 O 2 conversion efficiency. In 0.1 M HClO 4 , such CoSe 2 @NCNTs hybrid delivers a high H 2 O 2 selectivity of 93.2% and a large H 2 O 2 yield rate of 172 ppm·h −1 with excellent durability up to 24 h. Moreover, CoSe 2 @NCNTs performs effectively for organic dye degradation via electro-Fenton process.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2021
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IF 5.316
Liwei Shi,Wenbo Yuan,Jinglei Liu,Wenqian Zhang,Shifeng Hou,Cheng Hu
Although lithium-sulfur batteries have drawn widespread attentions due to their high energy densities at low costs, the scale-up applications are still hindered by issues such as dissolution of lithium polysulfides (LiPSs) and slow oxidation/reduction kinetics. Herein, we report a novel cathode composite composed of “moss-like” P-doped NiSe 2 arrays grown on activated carbon cloth substrates (P-NiSe 2 /ACC). Experiments and DFT calculations together suggest that P-doping enhances the electron transfers between P-NiSe 2 and LiPSs, leading to improved chemical adsorptions and catalytic effects towards the redox conversions of the active sulfur species. This effectively inhibits the shuttling of LiPSs and maximizes the utilization of sulfur towards high specific capacities and stable long-term cycling at high sulfur loadings. The strong interactions and effective catalysis of P-NiSe 2 on LiPSs also enables three-dimensional growth of Li 2 S 2 /Li 2 S on the P-NiSe 2 /ACC cathode, realizing effective accommodation of volume expansions and significant alleviation of cathode passivation. As a result, the P-NiSe 2 /ACC cathode provides a high specific capacity of 1211 mAh g −1 at 0.2 C and an outstanding high-rate performance of 679 mAh g −1 at 3 C. At the high sulfur loading of 9.9 mg cm −2 , an area capacity of 8.42 mAh cm −2 is achieved with stable cycling for 100 charge/discharge cycles.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2021
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IF 5.316
Yi Wang,Xinyan Xiao,Tingting Ding,Mingli Lu
The transition-metal dichalcogenides (TMDs) with 1T phase structure holds great promise for providing abundant active sites and superior conductivity, while the achievement of highly efficient degradation activity over bare TMDs and TMDs-based photocatalysts is still challenges. In this work, a flower-like mixed 1T-2H phase MoSe 2 was synthesized via a sodium borohydride (NaBH 4 )-assisted solvothermal method, and then was selected as a “charge-transfer-bridge” to fabricate a dual Z-scheme AgI/1T-2H MoSe 2 /Bi 4 O 5 Br 2 composite with a 0D/3D hierarchical structure. The optimal AgI/1T-2H MoSe 2 /Bi 4 O 5 Br 2 composite exhibited the superior photocatalytic activity towards degrading RhB and TC relative to AgI/2H MoSe 2 /Bi 4 O 5 Br 2 and AgI/Bi 4 O 5 Br 2 . The enhancement is attributed to its better light absorption, abundant active sites, and superior charge carrier mobility and separation efficiency, resulted from synergetic effect of 0D/3D structural coupling and energy band matching. Moreover, the important energy band alignments and mixed 1T-2H phase MoSe 2 boosting photocatalytic mechanism of as-prepared AgI/1T-2H MoSe 2 /Bi 4 O 5 Br 2 heterojunction were investigated. This work describes a competitive design and fabrication technique for constructing novel mixed phase TMDs-based Z-scheme heterojunctions to address environmental issues.
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ACS Applied Energy Materials
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2021
·
IF 6.024
Ning-Ning Zhou,Ze-Qing Hu,Ramzi Nasser,Ji-Ming Song
High thermoelectric performance and low material cost are essential to the commercialization of thermoelectric modules. Microstructural design, size effects, and rational band engineering are among the keys to high thermoelectric performance, especially for nanocomposites. Here, we demonstrate a facile and versatile bottom-up approach to produce nanocomposites by heat consolidating solution-processed PbSe nanoparticles with a proper amount of Ag. In this PbSe-Ag system, a certain amount of Ag diffuses into the PbSe matrix and partially substituted Pb while other forms Ag2Se at the interphases. This increased the electrical conductivity and inversed the n-type behavior of PbSe to p-type, which is observed from the positive Seebeck coefficient for PbSe-Ag nanocomposites over the temperature range. Nonetheless, the decrease of total lattice thermal conductivity at high temperature is ascribed to the effective phonon at grain boundaries, Ag2Se nanodomain, and point defect. Overall, we obtained an optimized figure of merit, ZT = 0.97 at 723 K for 5 wt % Ag, a significant improvement of 8.8 times than the pure PbSe. Thus, this partially substituting host atom and the presence of a secondary phase provide another potential strategy to enhance the thermoelectric performance of PbSe, promoting its commercialization.
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Catalysts
·
2021
·Vol. 11
·期 2
·169
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IF 4.146
Yan Tan,Yijun Yin,Xianhong Yin,Chenghao Lan,Yu Wang,Feilong Hu,Qin Huang,Yan Mi
The pursuit of low-cost and high-efficiency catalyst is imperative for the development and utilization of hydrogen energy. Heteroatomic doping which is conducive to the redistribution of electric density is one of the promising strategies to improve catalytic activity. Herein, the Se-doped CoS2porous nanowires array with a superaerophobic surface was constructed on carbon fiber. Due to the electronic modulation and the unique superaerophobic structure, it showed improved hydrogen evolution activity and stability in urea-containing electrolyte. At a current density of 10 mA cm−2, the overpotentials are 188 mV for hydrogen evolution reaction (HER) and 1.46 V for urea oxidation reaction (UOR). When it was set as a cell, the voltage is low as 1.44 V. Meanwhile, the current densities of HER and UOR, as well as of cell remained basically unchanged after a continuous operation for 48 h. This work opens up a new idea for designing of cost-saving hydrogen evolution electrocatalysts.Keywords:superaerophobic;cost-saving hydrogen evolution;heteroatom doping;electronic adjustment
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CHEMISTRY-A EUROPEAN JOURNAL
·
2021
·Vol. 27
·期 21
·6538-6544
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IF 5.236
Yi Huang,Le Gao,HaoHai Yu,Zhihua Yang,Junjie Li,Shilie Pan
Graphical Laser damage limitation : Promising ternary infrared nonlinear optical (NLO) materials, Na 6 MQ 4 (M=Zn, Cd; Q=S, Se), with unique [NaQ 4 ] NLO-active groups, are successfully prepared. Theoretical calculations and statistical analyses indicate that the second-harmonic generation effect and band gap in the compounds originate mainly from the distorted NaQ 4 NLO-active units with a short Na−S bond length. Four sodium-based ternary IR nonlinear optical (NLO) materials, Na 6 MQ 4 (M=Zn, Cd; Q=S, Se), were prepared through a high-temperature flux method. The crystal structure of the compounds is built up of isolated [MQ 4 ] tetrahedra and a 3D framework formed by the NaQ n ( n =4, 5) units. The two selenides, Na 6 MSe 4 (M=Zn, Cd), as promising IR NLO materials, show moderate second-harmonic generation (SHG) responses (0.9 and 0.5×AgGaS 2 ) with good phase-matching behavior, as well as high laser damage thresholds (2 and 1.9×AgGaS 2 ). The two sulfides, Na 6 MS 4 (M=Zn, Cd), exhibit higher laser damage thresholds (13 and 4×AgGaS 2 ), but smaller SHG responses (0.3 and 0.2×AgGaS 2 ). Theoretical calculations and statistical analyses indicate that the SHG effect and band gap in the compounds originate mainly from the distorted NaQ 4 NLO-active units with a short Na−S bond length, which provides a new insight into the design of novel IR NLO materials.
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Advanced Electronic Materials
·
2021
·Vol. 7
·期 7
·2000965
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IF 7.295
Zuoliang Wen,Pai Liu,Jingrui Ma,Siqi Jia,Xiangtian Xiao,Shihao Ding,Haodong Tang,Hongcheng Yang,Chaojian Zhang,Xiangwei Qu,Bing Xu,Kai Wang,Kie Leong Teo,Xiao Wei Sun
Colloidal nanoplatelets (NPLs) are an emerging semiconductor nanocrystal in the display community due to their ultranarrow emission linewidth. Herein, an ultrapure green emitting nanocrystal light-emitting diode (LED) based on four-monolayer CdSe/CdS core/crown NPLs is developed. By applying the nonstacked nanoplates, the nonradiative energy transfer in the NPLs film is successfully suppressed. The nonstacked NPL-LEDs with pure green emission of 521.5 nm exhibit a low turn-on voltage of 2.1 V, a maximum luminance of 22 400 cd m −2 , a peak external quantum efficiency (EQE) of 2.16%, which is a sixfold enhancement comparing to the stacked NPL-LED (EQE = 0.34%). This work demonstrates the potential of core/crown NPLs for ultrawide color gamut displays.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2021
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IF 3.764
Xianwen Zhang,Ping Li,Bin Xu,Jingxia Wang,Guangyin Fan,Xiaobin Zhang,Xiaoqiang Liu,Kaiming Zhang,Weidong Jiang
Selective hydrogenation of halogenated nitrobenzenes (XNBs) to halogenated amines (XANs) is of great importance for practical applications. Non-noble metal-based catalysts have shown prominent advantages in price and reserves accompanying low activity and selectivity toward the hydrogenation of halogenated nitrobenzenes (XNBs) even under harsh conditions. In this work, inexpensive Ni–Co-based composites (NxCC) were prepared for in situ tandem hydrogenation of XNBs to XANs by using hydrogen released from ammonia borane (AB) hydrolysis under ambient pressure. The results show these NxCC samples exhibited superior catalytic performance against Co3O4 or NiO samples. A selected N0.2CC catalyst as the mainly screened one can quantitatively convert XNBs to XANs with unprecedented activity with 100% XAN conversion. This catalyst can completely convert m-chloronitrobenzene (m-CNB) to m-chloroaniline (m-CAN), suggesting N0.2CC efficiently suppresses the further dichlorination of m-CAN. Recycling test shows the N0.2CC possesses higher stability and recyclability. The N0.2CC catalyst was found to be a dual catalyst that synergistically catalyzes both the AB dehydrogenation (about 1735 mL min–1 g–1 of hydrogen generation rate) and the subsequent hydrogenation (almost 100% conversion) of XNBs. Notably, it is the first time that the rapid in situ hydrogen activation (IHA) which facilely arouses the efficient hydrogenation of adsorbed substrate on the surface of catalyst has been elaborated. From a unique perspective, distinctive and simple control experiments were innovatively designed for testifying the advantage of tandem hydrogenation in contrast with traditional hydrogenation. This work presents an efficient and environmental strategy to selectively produce XANs from XNBs using high-performance non-noble metal composites.
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Advanced Materials Interfaces
·
2021
·Vol. 8
·期 9
·2100052
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IF 6.147
Lijuan Lai,Fangshu Xing,Chuchu Cheng,Caijin Huang
Hierarchical structure design and use of cocatalyst are effective strategies to improve the photocatalytic performance of semiconductor catalysts. Herein, 0D NiSe 2 nanoparticles decorated 2D ZnIn 2 S 4 ultrathin nanosheet-assembled microflowers using a facile solvothermal approach are synthesized. The as-obtained NiSe 2 /ZnIn 2 S 4 nanocomposites exhibit enhanced visible-light photocatalytic H 2 -evolution activity of 1487 µ mol (g h) –1 , three times higher than that of pure ZnIn 2 S 4 . The hierarchical structure of ZnIn 2 S 4 microflowers exposes more surface-active sites and enhances light harvesting. Meanwhile, the formation of heterojunctions between ZnIn 2 S 4 nanosheets and NiSe 2 nanoparticles creates a space-charge separation region that facilitates the transfer and separation of photoinduced electrons and holes, resulting in improved photocatalytic H 2 production. This work provides a promising strategy for designing and constructing 0D/2D heterojunctions for efficient solar-driven energy conversion.
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