Journal of Energy Chemistry
·
2018
·
IF 3.886
Jiandong Liu,Jiaojiao Liang,Caiyun Wang,Jianmin Ma
One-dimensional nano-structured materials have attracted attention due to its unique properties afforded such as the across-linked structures and large aspect ratios. In this work, one-dimensional CoSe@N-doped carbon nanofibers (CoSe@NC NFs) are successfully by combining the techniques of electrospinning and annealing. Selenium powder are directly dispersed in the polyacrylonitrile /N,N-Dimethylformamide (DMF) solution containing cobalt salt to form the product. The performance of these materials was investigated in Li-ion batteries after the annealing at different temperatures. The CoSe@NC nanofibers annealed at 550 °C (CoSe@NC-550) and displayed excellent storage properties, affording a high capacity of 796 mAh·g −1 at a current density of 1 A·g −1 for 100 cycles. Moreover, it is confirmed that the pseudocapacitive contribution of CoSe@NC-550 is up to 72.8% at the scan rate of 1 mV/s through the cyclic voltammetry analysis.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2018
·
IF 3.235
Wenna Zhang,Wenwen Zhang,Shuai Chen,Bin Guo,Hua Gu,Yu Xue,Zexu Xue,Jingkun Xu
In recent years, polyselenophene and its derivatives have been paid more attention due to their unique properties such as lower band gaps and redox potentials . However, the poor solubility and molecular rigidity of polyselenophene and its derivatives limit them to use in flexible optoelectronic devices. Therefore, in order to enrich the structures and properties, fully understand the structure-property relationship and further improve the electrochromic performances of polyselenophene and its derivatives, we synthesized its propyl-analogues as precursors, to electrosynthesize three conducting polymers , poly(3,4‑propylenedioxyselenophene) (PProDOS) and its alkyl-modified derivatives, poly(3,3′‑dimethyl‑3,4‑dihydro‑2H‑selenopheno[3,4‑b][1,4]dioxepine) (PProDOS-C 1 ) and poly(3,3′‑dibutyl‑3,4‑dihydro‑2H‑selenopheno[3,4‑b][1,4]dioxepine) (PProDOS-C 4 ). The electrochemical and spectroelectrochemical behaviors of PProDOS and PProDOS-C n (n = 1, 4) were investigated in detail in an ionic liquid , 1‑butyl‑3‑methylimidazolium hexafluorophosphate (BmimPF 6 ). Results showed that PProDOS-C 1 and PProDOS-C 4 exhibited superior electrochromic performances such as high optical contrast (62%) and excellent coloration efficiency (573 cm 2 C −1 ). In addition, as the alkyl chains increased, the onset oxidation potentials of monomers and the optical band gaps of polymer films decreased and the electrochemical activity of polymers increase. These polymers supply varied electrochromic colors and have prospect in display application.
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2018
·
IF 8.097
Yalan Chen,Jingtong Zhang,Peng Guo,Haijun Liu,Zhaojie Wang,Ming Liu,Tian Zhang,Shutao Wang,Yan Zhou,Xiaoqing Lu,Jun Zhang
Hydrogen evolution reaction (HER) driven by high-performance and low-cost electrocatalysts has been well-identified as one of the most promising technologies to explore sustainable power sources. In this work, the authors demonstrated a series of Fe–Mo selenide composite nanomaterials with adjustable HER catalytic activities by a simple one-step hydrothermal reaction. The heterostructured catalyst exhibited significant enhancement in HER activity compared to the pristine MoSe2 and FeSe2 catalysts. It is found that the optimized Mo–Fe selenide can drive the HER at a current density of 10 mA cm–2 by an overpotential of 86.9 mV in acidic solution. Also, it possesses outstanding kinetics (Tafel slope of 57.7 mV dec–1) of the electrochemical reaction. Besides the synergistic effect of different chemicals, the coupled Mo–Fe selenide achieved the electronic modulation of the heterointerface, where electrons were accelerated to transfer from dispersed FeSe2 to the active edges on 1T-MoSe2 and further activated the electrochemical performance.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Analytical Methods
·
2019
·Vol. 11
·期 32
·4137-4145
·
IF 2.378
Feng Cui,Qianying Qiu,Gang Peng,Xiaoyan Li,Xi Liu,Xiaojun Chen
The microRNA family shows great promise for the diagnosis and prediction of different cancers as biomarkers, in which miRNA-155 (miR155) is recognized as a biomarker for lung cancer and thus has drawn much attention. Therefore, the development of specific and accurate methods to detect miR155 has become a potential research hotspot. In this work, we presented a fluorescence resonance energy transfer (FRET) technique by utilizing core–shell CdSeTe/ZnS quantum dots (QDs) as a signal reporter and a target recycling strategy as a signal amplifier for the detection of miR155. In the presence of miR155, part of the hairpin probe (HP) immobilized onto the surface of gold nanoparticles (AuNPs)@SiO2, could hybridize with it. Then, numerous H1-AuNPs@SiO2 could be produced with the aid of exonuclease III. With the linkage of the assistant chain A2, H1-AuNPs@SiO2 combined with A1-QDs and then the fluorescence (FL) signal of QDs was quenched by AuNPs@SiO2via FRET. The more miR155 present in solution, the weaker the detected FL signal. A linear response range of 0.01 fM to 1 nM and low detection limit of 3 aM were obtained using the proposed method. Furthermore, this method showed high specificity and satisfactory recovery between 93 and 105% in real human serum samples, illustrating its great potential for practical applications.
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Bo Zhao,Qianqian Liu,Guijuan Wei,Jianghao Wang,Xin-Yao Yu,Xiang Li,Hao Bin Wu
CoSe 2 is a potential anode material for sodium-ion batteries in terms of their high sodium storage capacity and tunable properties. However, structural degradation and unstable interphase during the reversible sodiation and de-sodiation lead to fast capacity decay. In this work, we develop a nanocomposite architecture based on CoSe 2 nanoparticles embedded in N-doped carbon matrix with conformal TiO 2 coating (CoSe 2 @NC@TiO 2 ) by using a metal-organic framework-assisted strategy. The small CoSe 2 nanoparticles and N-doped carbon matrix facilitate charge transport and suppress the structural degradation, while the redox-active TiO 2 shell further strengthens the structural and interfacial stability without decreasing the capacity. The as-prepared CoSe 2 @NC@TiO 2 nanocomposite particles deliver a reversible sodium storage capacity of 520 mAh g −1 at 0.1 A g −1 with a capacity retention of 78% after 200 cycles, in contrast to the rapid capacity fading after 50 cycles of the pristine CoSe 2 @NC particles without TiO 2 shell.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2019
·
IF 4.175
Peng Zhou,Libao Chen,Mingyu Zhang,Qizhong Huang,Chao Cui,Xiu Li,Liping Wang,Liewu Li,Cheng Yang,Yuhao Li
Long-cycle-life and high-capacity nitrogen-doped carbon-coated α-MnSe nanofibers (α-MnSe/N-CNFs) electrodes were prepared by using an electrospinning process. The one-dimensional structural of α-MnSe/N-CNFs possesses great stability and play a key role in obtaining a long-cycle life for lithium-ion batteries. With nitrogen doping, improved pseudocapacitive behavior and conductivity were observed and the reversible capacity of the was increased to 956.3 mA h g −1 at 0.2 A g −1 after 200 cycles. The discharge capacity of α-MnSe/N-CNFs after 500 cycles reached 613.0 mA h g −1 even at a high current density of 1 A g −1 . The excellent electrochemical performance of α-MnSe/N-CNFs holds great promise as a candidate anode material for high-performance lithium-ion batteries.
✓ 已验证
产品关联
DOI
高影响因子
MICROCHIMICA ACTA
·
2018
·Vol. 185
·期 11
·1-7
·
IF 5.705
Wang Yi-Han,Xia Huan,Huang Ke-Jing,Wu Xu,Ma Ying-Ying,Deng Rui,Lu Yun-Fei,Han Zi-Wei
A sensitive aptamer/protein binding-triggered sandwich assay for thrombin is described. It is based on electrochemical-chemical-chemical redox cycling using a glassy carbon electrode (GCE) that was modified with WSe 2 and gold nanoparticles (AuNPs). The AuNPs are linked to thrombin aptamer 1 via Au-S bonds. Thrombin is first captured by aptamer 1 and then sandwiched through the simultaneous interaction with AuNPs modified with thrombin-specific aptamer 2 and signalling probe. Subsequently, the DNA-linked AuNP hybrids result in the capture of streptavidin-conjugated alkaline phosphatase onto the modified GCE through the specific affinity reaction for further signal enhancement. As a result, a linear range of 0–1 ng mL −1 and a detection limit as low as 190 fg mL −1 are accomplished. The specificity for thrombin is excellent. Conceivably, this strategy can be easily expanded to other proteins by using the appropriate aptamer.
Schematic presentation of an electrochemical biosensor for thrombin based on WSe 2 and gold nanoparticles, aptamer-thrombin-aptamer sandwiching, redox cycling, and signal enhancement by alkaline phosphatase.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Materials Today Physics
·
2018
·
IF 0
Y. Zhou,H. Wu,D. Wang,L. Fu,Y. Zhang,J. He,S.J. Pennycook,L.-D. Zhao
The ternary diamond-like compound Cu 2 SnSe 3 is a potential thermoelectric material . Its Cu-Se conducting network leaves Sn as a likely doping site to optimize the carrier concentration without much deterioration to the carrier mobility . Thus, the precise determination on the intricate phase structures of Cu 2 SnSe 3 is critical. Here, we first use the atomically resolved scanning transmission electron microscopy and reveal an unusual phase coexistence (monoclinic and orthorhombic phases) in Ag-doped Cu 2 SnSe 3 . Owing to coexisting phases and the order–disorder transition in the orthorhombic phase, the Ag-doped Cu 2 SnSe 3 shows an unusual three-stage behavior in its temperature-dependent electrical transport properties and achieves record high power factors in this system. The observed three-stage behavior due to the phase coexistence is supported by the first principle calculations, Hall measurements, and optical diffuse reflectance measurements . To fully understand the band structures and the coherent interface between these coexisting phases, a band contact model is proposed that could well explain the three-stage electrical transport behavior. Moreover, the phase coexistence is observed at the nanoscale regime, thus providing a high density of phase boundaries. Such coexisting nanophases play an important role in lowering the lattice thermal conductivity . As a result, the ZT value obtained in Cu 2 Sn 0.93 Ag 0.07 Se 3 is double that of undoped Cu 2 SnSe 3 .
✓ 已验证
产品关联
DOI
ELECTROCHIMICA ACTA
·
2018
·
IF 5.116
Yi-Fan Jiang,Cheng-Zong Yuan,Xiao Zhou,Ya-Nan Liu,Zhi-Wei Zhao,Sheng-Jie Zhao,An-Wu Xu
The design of inexpensive, efficient, durable and self-supported bifunctional electrodes for simultaneously catalyzing the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) in the same electrolyte is essential for renewable energy conversion processes and future sustainable development, however, it still remains a challenging issue. Reported herein is the first example of selenium phosphorus co-doped cobalt oxide nanosheets on highly conductive Co foil collector (CoOSeP@Co foil), fabricated by successively selenylation and phosphorization of a pre-oxidized Co foil, as a novel bifunctional electrode for water electrolysis. Due to the improved intrinsic catalytic activity of cobalt oxide derived from doping and the strong interaction between active CoOSeP nanosheets and highly conductive Co foil collector, the designed CoOSeP@Co foil integrated electrode displays favorable catalytic activities towards both HER and OER in strongly alkaline media, achieving an electrocatalytic current density of 10 mA cm −2 at a low overpotential of 155 mV for HER and 347 mV for OER, respectively. Beyond that, the electrode could keep working and maintain its catalytic activity for at least 30 h. Furthermore, an alkaline electrolyzer constructed by employing CoOSeP@Co foil as an integrated bifunctional electrode in both the cathode and anode can generate 10 mA cm −2 at a cell voltage of 1.74 V and shows good long-term stability of more than 30 h. This work not only opens a new avenue to improve the intrinsic catalytic activity of materials by co-doping with heteroatoms , but also brings us a new idea for designing other cost-effective, self-supported, efficient and robust overall water splitting electrodes.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2018
·
IF 6.945
Wei Xing,Dongfeng Du,Tonghui Cai,Xiaochen Li,Jin Zhou,Yongming Chai,Qingzhong Xue,Zifeng Yan
Aluminum ion batteries are attractive new generation energy storage devices in large-scale energy applications such as grid storage due to its low cost, high safety and three-electron-redox properties potentially leading to high capacity. Cathode materials with both high capacity and rate performance are urgently needed to fulfill such applications. Here, a three-dimensional carbon-encapsulated cobalt selenide nanoparticles are developed from metal organic frameworks as a novel aluminum ion batteries cathode. The cathode material delivers an unprecedented capacity of 427 mAh g −1 at 1000 mA g −1 with two high discharge plateaus at 1.0 V and 1.9 V (equivalent to energy density of 424 Wh kg −1 ). And even at a very high current density of 5000 mA g −1 , the initial discharge capacity of cathode electrode can reach 254.8 mAh g −1 , and a high capacity of 62.4 mAh g −1 is retained after 100 cycles. Such outstanding performance are attributed to the well-defined nanostructure of three-dimensional carbon-encapsulated cobalt selenide cathode material. This work represents a significant step forward to prepare advanced cathode materials for aluminum ion batteries.
✓ 已验证
产品关联
DOI
高影响因子
Advanced Optical Materials
·
2018
·Vol. 6
·期 21
·1800639
·
IF 7.43
Lufan Jin,Yating Zhang,Yu Yu,Zhiliang Chen,Yifan Li,Mingxuan Cao,Yongli Che,Jianquan Yao
Colloidal wurtzite-structure CdSe/ZnS quantum dots (CWQDs), with noncentral asymmetry structure and spontaneous polarization, have an extensive potential for applications based on the pyroelectric effect, such as energy harvestors, self-powered nanogenerators, and photosensors. Here, a low-cost, easy-fabrication, and high-speed self-powered photodetector is demonstrated, which performs independently without any external power source. The response of the device caused by the photoinduced-pyroelectric effect is experimentally investigated based on the Au/CWQDs/Au edge-electrodes structure, which exhibits an ultrafast photoresponse with a rising time of 20.6 µs and a falling time of 30.1 µs. Moreover, the frequency and temperature dependence of the device also is investigated under zero bias. This work provides a new approach to achieve self-powered photodetectors, which may show promise for extensive batch applications, such as wireless sensing, optothermal detection, optoelectronic communication, and energy harvesting.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2018
·
IF 5.091
Menglei Yuan,Meng Wang,Peilong Lu,Yu Sun,Sobia Dipazir,Jingxian Zhang,Shuwei Li,Guangjin Zhang
The electrochemical oxygen evolution reaction (OER) is sparked extensive interest in efficient energy storage and conversion. Cobalt Selenide (CoSe 2 ) is believed to be one of the promising candidates for OER based on Yang Shao-Horn's principle. However, owing to low exposure of active sites and/or low efficiency of electron transfer, the electrocatalytic activity of CoSe 2 is far less than expected. In this work, a novel carbon nanotubes (CNT) grafted 3D core-shell structured CoSe 2 @C-CNT nanohybrid is developed by a general hydrothermal-calcination strategy. Zeolite imidazole frameworks (ZIF) was used as the precursor to synthesis of the materials. It is found that both the calcination temperature and the selenium content can significantly regulate the catalytic performance of the hybrids. The obtained best catalysts requires the overpotential of only 306 mV and 345 mV to reach a current density of 10 mA cm −2 and 50 mA cm −2 in 1.0 MKOH medium, respectively. It also exhibits a small Tafel slope of 46 mV dec −1 and excellent durability, which is superior to most of recently reported CoSe 2 -based and Co-based materials. These superior performances can be ascribed to synergistic effects of the highly active CoSe 2 nanostructure, defect carbon species and the carbon nanotubes exist in the catalyst. Besides, the unique morphology leads to large electrochemical surface area of the catalyst, which is in favor of the exposure of active sites for OER. Due to high efficiency, low cost and excellent durability for OER, the prepared catalysts showed can be potentially used to substitute noble metals utilized in related energy storage and conversion devices.
✓ 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）