Journal of Materials Chemistry A
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2018
·Vol. 6
·期 16
·7088-7098
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IF 9.931
Chao Cui,Zengxi Wei,Gang Zhou,Weifeng Wei,Jianmin Ma,Libao Chen,Chengchao Li
Developing electrode materials with a full conversion reaction is an effective route to break through the capacity barriers, but this goal remains a great challenge. In this work, we report the synthesis of CoSe2 anodes with a quasi-reversible conversion reaction by uniformly encapsulating CoSe2 nanoparticles in nitrogen-doped carbon nanofibers (CoSe2/N-CNFs). The space-confined effect of CNFs effectively inhibits pulverization and amorphization of CoSe2 during charge and discharge and thus remarkably ensures the integrity of the crystal structure. Meanwhile, pseudocapacitive contributed by the size effect of CoSe2 nanodots and excellent conductivity due to doped nitrogen heteroatoms give the electrode outstanding electrochemical properties. When used as an anode, the CoSe2/N-CNFs achieved a reversible capacity of 371.8 mA h g−1 after 500 cycles at 0.2 A g−1. Even at a high current density of 2 A g−1, the discharge capacity of the CoSe2/N-CNFs still reached 308 mA h g−1 after 1000 cycles with excellent rate performance. The first principles calculations demonstrate that the heterointerfaces between CoSe2 and nitrogen-doped carbon can significantly enhance the stability of the structure and improve the storage/diffusion capability of Na+. Moreover, ex situ high-resolution transmission electron microscopy (HRTEM) and selected area electron diffraction (SAED) reveal that the unique structure enables quasi-reversible crystalline-phase transformation of CoSe2, which leads to the superior cycling stability of the battery with high capacity retention.
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INORGANIC CHEMISTRY
·
2018
·
IF 4.7
Fan Sun,Zhongnan Guo,Ning Liu,Dan Wu,Jiawei Lin,Erjian Cheng,Tianping Ying,Shiyan Li,Wenxia Yuan
In this work, we report the discovery of a new Ni-based quasi-one-dimensional selenide: Cs0.9Ni3.1Se3. This compound adopts the TlFe3Te3-type structure with space group P63/m, which consists of infinite [Ni3Se3] chains with face-sharing Ni6 octahedra along the c direction. The lattice parameters are calculated as a = 9.26301(4) Å and c = 4.34272(2) Å, with the Ni–Ni distance in the ab plane as 2.582(3) Å, suggesting the formation of a Ni–Ni metallic bond in this compound. Interestingly, it has been found that Cs0.9Ni3.1Se3 is nonstoichiometric, which is different from the other TlFe3Te3-type phases reported so far. Structure refinement shows that the extra Ni atom in the structure may occupy the 2c site, together with Cs atoms. Cs0.9Ni3.1Se3 shows metallic behavior with monotonously decreased resistivity with temperatures from 300 to 0.5 K. Measurements on the magnetic susceptibility display a spin-glass state below 7 K. The specific heat curve gives a Sommerfeld coefficient of 14.6 mJ·K–2·mol–1 and a Debye temperature of 143.6 K. The discovery of this new compound enriches the diversity of low-dimensional materials in a transition-metal-based family and also sheds light on the structure–property relationship of this system.
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COLLOIDS AND SURFACES B-BIOINTERFACES
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2018
·
IF 3.997
Xijian Liu,Yeying Wang,Qiyang Yu,Guoying Deng,Qian Wang,Xinhui Ma,Qiugen Wang,Jie Lu
A multifunctional selenium nanocomposite (selenium@silica core-shell nanoshperes for loading indocyanine green(ICG)/Doxorubicin(DOX)) was fabricated to reach visible and efficient cancer treatment. The Se@SiO 2 -ICG nanocomposites could be used not only as excellent photothermal agents but also as carriers for DOX delivery. In addition, the Se@SiO 2 -ICG/DOX nanocomposites exhibited excellent fluorescence imaging and infrared imaging performance. Tumor could be effectively inhibited by Se@SiO 2 -ICG/DOX due to the triple treatment of photothermal effect and chemotherapy of selenium and DOX. Thus, the Se@SiO 2 -ICG/DOX nanocomposites have a great potential in imaging guiding synergistic treatment of cancer.
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Nano Research
·
2018
·Vol. 11
·期 9
·4587-4598
·
IF 7.994
Zhang Jingtong,Chen Yalan,Liu Ming,Du Kun,Zhou Yan,Li Yanpeng,Wang Zhaojie,Zhang Jun
Few-layered MoSe 2 nanosheets with mixed 1T/2H phase were successfully arrayed on a Ti substrate (forming 1T@2H-MoSe 2 /Ti) through a facile one-step solvothermal process. After testing different synthesis conditions, it was found that the optimal process involves a temperature of 200 °C and a reaction time of 12 h. Structural characterizations reveal that the morphology of 1T@2H-MoSe 2 consists of edge-terminated nanosheets with one to five layers, composed of a mixed 1T/2H phase dominated by the 1T one. The 1T@2H-MoSe 2 /Ti electrode shows excellent HER catalytic activity, with a small onset potential (−120 mV vs. reversible hydrogen electrode, RHE) and an electrode potential of only −133 mV (vs. RHE) to achieve a current density of 20 mA·cm −2 . This excellent electrocatalytic activity is due to the synergistic effects of 1T metallic phase, few-layered nanosheet morphology, and direct growth of 1T@2H-MoSe 2 on the Ti substrate. In addition, the 1T@2H-MoSe 2 /Ti electrode shows excellent stability towards long-term electrolysis. This is due to the long-term stability of the valence states of Mo and Se, as shown by post-electrolysis X-ray photoelectron spectroscopy analysis.
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ACS Nano
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2018
·
IF 13.709
Hongli Wan,Jean Pierre Mwizerwa,Xingguo Qi,Xin Liu,Xiaoxiong Xu,Hong Li,Yong-Sheng Hu,Xiayin Yao
High ionic conductivity electrolyte and intimate interfacial contact are crucial factors to realize high-performance all-solid-state sodium batteries. Na2.9PS3.95Se0.05 electrolyte with reduced particle size of 500 nm is first synthesized by a simple liquid-phase method and exhibits a high ionic conductivity of 1.21 × 10–4 S cm–1, which is comparable with that synthesized with a solid-state reaction. Meanwhile, a general interfacial architecture, that is, Na2.9PS3.95Se0.05 electrolyte uniformly anchored on Fe1–xS nanorods, is designed and successfully prepared by an in situ liquid-phase coating approach, forming core–shell structured Fe1–xS@Na2.9PS3.95Se0.05 nanorods and thus realizing an intimate contact interface. The Fe1–xS@Na2.9PS3.95Se0.05/Na2.9PS3.95Se0.05/Na all-solid-state sodium battery demonstrates high specific capacity and excellent rate capability at room temperature, showing reversible discharge capacities of 899.2, 795.5, 655.1, 437.9, and 300.4 mAh g–1 at current densities of 20, 50, 100, 150, and 200 mA g–1, respectively. The obtained all-solid-state sodium batteries show very high energy and power densities up to 910.6 Wh kg–1 and 201.6 W kg–1 based on the mass of Fe1–xS at current densities of 20 and 200 mA g–1, respectively. Moreover, the reaction mechanism of Fe1–xS is confirmed by means of ex situ X-ray diffraction techniques, showing that partially reversible reaction occurs in the Fe1–xS electrode after the second cycle, which gives the obtained all-solid-state sodium battery an exceptional cycling stability, exhibiting a high capacity of 494.3 mAh g–1 after cycling at 100 mA g–1 for 100 cycles. This contribution provides a strategy for designing high-performance room temperature all-solid-state sodium battery.
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Advanced Optical Materials
·
2018
·Vol. 6
·期 10
·1701389
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IF 7.43
Zhongyuan Guan,Aiwei Tang,Peiwen Lv,Zhenyang Liu,Xu Li,Zhan'ao Tan,Tasawar Hayat,Ahmed Alsaedi,Chunhe Yang,Feng Teng
A series of multinary Cu-In-Zn-Se-S nanocrystals (NCs) are synthesized via a phosphine-free and one-pot approach, in which the Se powder and 1-dodecanethiol (DDT) are used as chalcogenide sources, respectively. The X-ray photoelectron spectra are used to confirm the presence of lattice sulfur in the as-obtained products. The emission color and the relative photoluminescence quantum yields of the Cu-In-Zn-Se-S NCs can be tuned by varying the Cu contents, the amount of Se powder, as well as the DDT dosage. In addition, the formation process of the multinary Cu-In-Zn-Se-S NCs is different from that of quaternary Cu-In-Zn-S NCs, which is dominated by the doping of Cu ions into the In-deficient In-Zn-Se-S NCs but not the partial interdiffusion of Zn 2+ into the Cu-based NCs. This plausible deduction is based on the comparison of optical properties of the products synthesized using the hot-injection and one-pot methods. Furthermore, the performance of the solution-processed quantum-dot light-emitting diodes (QLEDs) using the Cu-In-Zn-Se-S NCs as emission layers is examined, and the QLEDs exhibit a high luminance over 1500 cd m −2 and a high peak current efficiency of ≈0.4 cd A −1 at 1000 cd m −2 .
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APPLIED SURFACE SCIENCE
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2018
·
IF 4.439
Xu Mao,Jianpeng Zou,Hongchao Li,Zhengqi Song,Siru He
Tungsten diselenide (WSe 2 ) films with different growing orientations exhibit diverse photoelectric properties. The WSe 2 film with C-axis⊥substrate texture has been prepared and applied to thin-film solar cells. W nanofilms with a thickness of 270 nm were deposited onto the Mo bottom electrode and then heat-treated in selenium vapor to synthesize WSe 2 films with a thickness of 1 μm. ZnO films were deposited onto WSe 2 films to form a P-N junction and ITO films were deposited subsequently as the conductive layer. X-ray diffractometry, scanning electron microscopy and UV-vis-NIR spectro-analysis instrument were employed to analyze the phase composition, optical absorptivity and micromorphology of WSe 2 films and the WSe 2 solar cell device. WSe 2 films exhibit excellent photoelectric performance with an optical absorption coefficient greater than 10 5 cm −1 across the visible spectrum. The calculated direct and indirect band gap of the WSe 2 films is 1.48 eV and 1.25 eV, respectively. With the application of standard glass/Mo/WSe 2 /ZnO/ITO/Ag device structure, the open-circuit voltage of the battery device is 82 mV. The short-circuit current density is 2.98 mA/cm 2 and the filling factor is 0.32. The photoelectric conversion efficiency of the WSe 2 film solar cell device is 0.79%.
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CRYSTAL GROWTH & DESIGN
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2018
·
IF 3.972
Xiao-Ning Hu,Lin Xiong,Li-Ming Wu
The A2MIIMIV3Q8 family (A = alkali metal; MII = divalent metal; MIV = tetravalent metal; Q = chalcogenide) has attracted much attention because of its diverse structures and properties. Herein, we have successfully synthesized six new compounds as the first Mn-containing members of this family, Cs2MnGe3S8 (1), Cs2MnGe3Se8 (2), Cs2MnSn3Se8 (3), Rb2MnGe3S8 (4), Rb2MnGe3Se8 (5), and Rb2MnSn3Se8 (6). Compounds 1 and 6 crystallize in the monoclinic space group P21/n (No. 14) and P21 (No. 4), respectively, whereas compounds 2–5 crystallize in the non-centrosymmetric orthorhombic P212121 (No. 19). According to our theoretical calculations, their energy gaps are mainly dominated by s states of MIV and p states of Q and minor Mn 3d. Plate-like crystals with sizes about 20 × 5 × 1 mm3 of 2 and 3 are obtained by the Bridgeman method. In addition, we propose a structure mismatch factor that is defined as F = rMII+ rMIV + 2rQ2– – 2rA+ to provide a clear description of how three different structure types distribute among the A2MIIMIV3Q8 family; when 1.2 < F < 1.9, members will adopt a P212121-type structure; when F is too small (<1.2) or too large (>1.9), P21/n or P21-type, respectively, will be taken.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2018
·
IF 3.779
Jun Wan,Baihong An,Zhibeng Chen,Jingwei Zhang,William W. Yu
Nitrogen doped graphene oxide (NG) modified WSe 2 nanorod composites (WSe 2 /NG) were prepared by a hydrothermal synthesis route. The synthesized samples were characterized by scanning electron microscopy (SEM), energy dispersive spectrometer (EDS), transmission electron microscopy (TEM), UV–vis diffuse reflectance spectroscopy(DRS) and elemental analysis . Using methylene blue (MB) as a target organic dye, WSe 2 /NG nanocomposites exhibited significant enhancement in photocatalytic degradation of MB under visible light irradiation compared with WSe 2 . That was mainly attributed to the strong adsorption of MB, excellent electrical conductivity and charge separation features of the NG, leading to effectively restrained electron-hole pair recombination of WSe 2 nanorods. Among the hybrid photocatalysts , WSe 2 /50NG (50 wt% of NG) exhibited the highest photocatalytic activity with a rate constant of 0.0572 min −1 for the degradation of the MB in aqueous solution under visible light irradiation, and the removal efficiency reached 99.3% which was 2.4 times higher than that of WSe 2 . In addition, WSe 2 /NG also showed higher stability and good reusability.
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ACS Applied Materials & Interfaces
·
2018
·
IF 8.097
He Li,Jiali Jiang,Jianxing Huang,Yunhui Wang,Yueying Peng,Yiyong Zhang,Bing-Joe Hwang,Jinbao Zhao
In this study, one-dimensional Cu2–xSe nanorods synthesized by a simple water evaporation-induced self-assembly approach are served as the anode material for Na-ion batteries for the first time. Cu2–xSe electrodes express outstanding electrochemical properties. The initial discharge capacity is 149.3 mA h g–1 at a current density of 100 mA g–1, and the discharge capacity can remain at 106.2 mA h g–1 after 400 cycles. Even at a high current density of 2000 mA g–1, the discharge capacity of the Cu2–xSe electrode still remains at 62.8 mA h g–1, showing excellent rate performance. Owing to the excellent electronic conductivity and one-dimensional structure of Cu2–xSe, the Cu2–xSe electrodes manifest fast Na+ ion diffusion rate. Moreover, detailed Na+ insertion/extraction mechanism is further investigated by ex situ measurements and theoretical calculations.
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ACS Sustainable Chemistry & Engineering
·
2018
·
IF 6.14
Shuai Wan,Weiyang Jin,Xiaoliang Guo,Jing Mao,Lekai Zheng,Jianling Zhao,Jun Zhang,Hui Liu,Chengchun Tang
Developing low-cost, high performance, stable non-noble bifunctional electrocatalysts for overall water splitting is of great importance for future energy supplement. Despite recent advances in the synthesis of transition metal selenide nanostructures, the fabrication of porous nanosheet based binder-free electrode with more active sites remains a major challenge. Herein, the self-templating construction of a porous CoSe2 nanosheet array on carbon cloth (p-CoSe2/CC) has been reported by vapor selenizing the preprepared α-Co(OH)2 nanosheet array precursor. Arising from large active surface area, fast diffusion of generated gas and strong structural stability, the as-obtained p-CoSe2/CC can serve as an efficient bifunctional electrocatalyst for both OER and HER in alkaline electrolyte, with a current density of 10 mA cm–2 at overpotential of 243 mV for OER and 138 mV for HER, respectively. Moreover, when p-CoSe2/CC is assembled as an alkaline electrolyzor, it only needs a cell voltage of 1.62 V at 10 mA cm–2 and shows excellent long-term stability of 20 h. The versatile fabrication strategy with self-templated porous structure proves a new way to construct other advanced metal selenide for energy conversion and storage.
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JOURNAL OF NANOPARTICLE RESEARCH
·
2018
·Vol. 20
·期 9
·1-10
·
IF 2.127
Li Dong,Fang Minjie,Jiang Chunli,Lin Hechun,Luo Chunhua,Qi Ruijuan,Huang Rong,Peng Hui
Bismuth selenide (Bi 2 Se 3 ) has attracted great attention as one of typical topological insulator materials. In this work, size-controllable Bi 2 Se 3 nanoflowers (NFs) composed of numerous thin nanosheets are successfully synthesized by a hot-solution injection method under mild conditions. The structure and morphology of the obtained Bi 2 Se 3 NFs are characterized by powder X-ray diffraction (XRD), transmission electron microscopy (TEM), energy-dispersive X-ray spectroscopic (EDS), and selected area electron diffraction (SAED) techniques. The reaction temperature, time, and surfactant ratio (oleylamine/oleic acid) affect the phase purity and morphology of Bi 2 Se 3 samples. Based on the experimental results, the formation mechanism of Bi 2 Se 3 nanoflowers is proposed. Meanwhile, the photocatalytic behavior of the as-prepared Bi 2 Se 3 nanoflowers in the presence of H 2 O 2 is explored and it is found that the degrading rate of RhB can reach 93% after 2 h visible light irradiation.
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