JOURNAL OF POWER SOURCES
·
2017
·
IF 6.395
Xiang Cai,Yu Song,Zhen Sun,Di Guo,Xiao-Xia Liu
In-situ growing of energy storage materials on graphene-based substrates/current collectors with low defect is a good way to boost electron transport and so enhance rate capability for the obtained electrode. Herein, high-quality graphene-like nanopetals are partially exfoliated from graphite foil (GF) through a facile and fast cathodic process. Three-dimensional porous structure is established for the afforded cathodically-exfoliated graphite foil (CEG), with many graphene-like nanopetals vertically anchoring on the graphite substrate. A hierarchical structure is constructed by the following electrochemical growth of Co−Ni double hydroxide nanopetals on the graphene atop CEG. The double hydroxide in the obtained electrode with the optimized Co 2+ /Ni 2+ molar ratio , Co 0.75 Ni 0.25 (OH) 2 -CEG, displays much improved rate capability and so can deliver a high specific capacitance of 1460 F g −1 at an ultra-high current density of 100 A g −1 . An asymmetric device is assembled by using Co 0.75 Ni 0.25 (OH) 2 -CEG as cathode, which demonstrates a high energy density of 31.6 Wh kg −1 at an ultra-high power density of 21.5 kW kg −1 , showing the potential of the hierarchical composite electrode for high power application. The device also displays good stability, it can retain more than 90% of its capacitance after 10000 galvanostatic charge-discharge cycles.
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高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
·
2018
·
IF 3.649
Fan Xie,Zhuoying Xie,Panmiao Liu,Yi Yuan,Juan Li,Shan Chen,Fanglei Guo,Jialun Chen,Zhongze Gu
Organic functionalization of periodic mesoporous silicas (PMSs) is an imperative and effective measure to advance their preeminent properties and widespread application due to their structural superiority. In this study, we reported a novel synthesis of organic functionalized PMSs by co-condensing (R’O) 3 Si-H and (R’O) 3 Si-R type terminal trialkoxyorganosilanes based on periodic mesoporous hydridosilica, which is stable but pore walls are comprised of a three-connected three-dimensional network. The synthesis extended the “co-condensation” strategy and broke the incorporation limitation of organic groups by HSiO 3 units in the framework to form hydrogen bonds , which provided a more effective way to obtain PMSs with high degree of organic functionalization.
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高影响因子
JOURNAL OF RARE EARTHS
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2018
·
IF 2.524
Yaqian Chen,Huanping Wang,Xiaoting Zhang,Zhen Xiao,Qinghua Yang,Ruoshan Lei,Degang Deng,Lihui Huang,Shiqing Xu
(Y 0.87 La 0.1 Zr 0.03 ) 2 O 3 nanopowders doped with various concentrations of Tm 3+ and Ho 3+ were prepared by the citrate method. The standard cubic Y 2 O 3 phase can be matched in the Tm 3+ /Ho 3+ co-doped (Y 0.87 La 0.1 Zr 0.03 ) 2 O 3 nanopowders. The nanopowders exhibit average particle sizes of 40, 60, 80 and 100 nm after calcinated at 900, 1000, 1100 and 1200 °C, respectively. The energy transfer from Tm 3+ to Ho 3+ and the optimum fluorescence emission around 2 μm were investigated. Results indicate that the emission bands at around 1.86 and 1.95 μm correspond to 3 F 4 → 3 H 6 transition of Tm 3+ and 5 I 7 → 5 I 8 transition of Ho 3+ , respectively. Better spectral properties were achieved in Tm 3+ /Ho 3+ co-doped (Y 0.87 La 0.1 Zr 0.03 ) 2 O 3 nanopowders with the average size of 100 nm obtained at the conditions of the treatment of precursors calcinated at 1200 °C for 2 h doped with 1.5 mol% Tm 3+ and 1 mol% Ho 3+ .
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高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2020
·
IF 3.99
Shutao Li,Pengfei Wang,Haoxu Zhao,Rendong Wang,Ruisen Jing,Zilin Meng,Wenzhi Li,Zhilei Zhang,Yunyan Liu,Qian Zhang,Zhao Li
The novel photocatalyst capable of utilizing the full spectrum of solar energy has attracted the attention of researchers. Black phosphorus (BP), as a rising star in an assortment of 2D materials , possesses a broadband absorption due to its tunable direct bandgap, which makes it a candidate photocatalyst. In our work, poly dimethyldiallyl ammonium chloride (PDDA) is used to passivate BP nanosheets (BPNs) to improve its stability. Further, the functionalized BPNs and BiOBr are combined by a one-step co-precipitation method to form nanocomposites . The successful formation of nanocomposites obviously promoted the possibilities for the carrier transporting between BiOBr and BPNs, and effectively hindered the recombination of carriers, which is confirmed by all manner of characterization. Meanwhile, nanocomposites have enhanced light absorption and relatively large specific surface area , which also has a gain in its photocatalytic activity. The as-prepared nanocomposite photocatalysts significantly enhanced the photocatalytic activity with the best degradation effect of 14 and 3.4 times than pure BiOBr towards degradation of methylene orange (MO) and ciprofloxacin (CIP), respectively, under visible light . To get clear proofs of the photocatalytic mechanism, the UV–vis diffuse reflectance spectroscopy, photocurrents , electrochemical impedance spectra and Mott-Schottky measurements et al. were employed and the type-I band alignment was proposed. This finding provides an easily synthesis and effective way of BP/semiconductor photocatalysts and demonstrates a new perspective for designing novel solar light driven photocatalysts.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2021
·
IF 5.316
Zhurong Mo,Shaoshan Su,Yanping Huo,Hongli Wen,Andrzej Suchocki,Deshmukh Abdul Hakeem
Fundamental understanding of the Stokes and anti-Stokes emissions in luminescence materials and their mechanism is very important for different technological applications. In this article, we report the dual mode, down/upconversion (DC/UC), luminescence in a LiAlSi 2 O 6 (β-spodumene) single host along with its mechanistic investigations. A series of emission tunable Li 1- x AlSi 2 O 6 : x Er 3+ (LAS: x Er 3+ ; 0 ≤ x ≤ 0.07) and Li 0.99- y AlSi 2 O 6 :0.01Er 3+ , y Yb 3+ (LAS:0.01Er 3+ ,yYb 3+ ; 0.001 ≤ y ≤ 0.007) phosphor powders were prepared by solid state reaction method at 1300 °C. The formation of single-phase phosphors is verified by XRD technique and other structural properties are investigated by FT-IR, UV-Vis-NIR spectra. The phosphors produced NIR DC emission at 1535 nm (under 380 and 980 nm excitation) and an intense red UC emission at 655 nm (under both 980 and 808 nm excitations). The dual mode emission intensity of the LAS:0.01Er 3+ is further improved by co-doping Yb 3+ ions via energy transfer from Yb 3+ to Er 3+ . The red UC emission intensity of LAS:0.01Er 3+ ,0.005Yb 3+ phosphor under 980 nm excitation is ~10 times stronger than the singly doped LAS:0.01Er 3+ phosphor. In addition, the phosphors can also be efficiently excited by 808 nm laser and hence can be used for biological application since 808 nm NIR irradiation exhibits higher light penetration depth without inducing overheating. The mechanism of energy transfer from Yb 3+ to Er 3+ by considering different emission pathways viz: ground state absorption (GSA), excited state absorption (ESA), energy transfer upconversion (ETU), back energy transfer (BET) and cross relaxation (CR) are discussed in detail. Based on the dual mode emissions, the LAS: x Er 3+ and LAS: x Er 3+ , y Yb 3+ ( x = 0.1 and 0.001 ≤ y ≤ 0.007) phosphors could be a potential candidate not only for the biological application as bio-probe but also as energy convertors for solid-state lighting, displays, and solar cell applications.
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高影响因子
Energy Technology
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2019
·Vol. 8
·期 1
·1900950
·
IF 3.163
Kun Liu,Jijian Xu,Yuan Wang,Meng Qian,Wei Zhao,Yi Zeng,Fuqiang Huang
Heteroatom doping and a porous structure are two significant factors that improve the capacitance performance of carbon-based electrodes, but there are often one-sided considerations between them. Herein, effective B, N co-doping and trimodal-porous structure from the carbonization of sustainable natural wood are obtained at the same time. The unique pore structure is coarsely tuned by a modified ZnAc 2 -assisted hypersaline route and further fine-tuned by controlling the doping levels of boron and nitrogen. The high specific surface area of porous carbon up to 1201 m 2 g −1 is coordinated with the trimodal foam-like nanopores. This carbon-based material as a supercapacitor electrode can provide not only trimodal-porous ion transfer highways but also doping-induced pseudocapacitance. The resulting pore and heteroatom reengineered wood-derived carbon harvests a remarkable capacitance of 479 F g −1 at 1 A g −1 , among the highest values in reported B, N co-doped carbon electrodes. The aqueous symmetric supercapacitor exhibits energy density of 18.5 Wh kg −1 and power density of 6.4 kW kg −1 , along with >90% capacitance retention, both in H 2 SO 4 and Li 2 SO 4 electrolyte over 10 000 cycles.
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高影响因子
Materials Today Energy
·
2021
·
IF 7.311
H. Yu,Z. Wang,W. Tian,Z. Dai,Y. Xu,X. Li,L. Wang,H. Wang
Electrochemical nitrogen reduction reaction (NRR) has been regarded as one of the most promising alternative strategies for nitrogen fixation, and the design of efficient NRR catalysts is the critical factor. Herein, boron and sulfur co-doped mesoporous Rh film on Ni foam (B, S-mRh/NF) is developed for electrochemical ammonia synthesis. The boron and sulfur co-doping, the B, S-mRh/NF, can inhibit competitive hydrogen evolution reaction effectively. Owing to binder-free mesoporous structures, binder-free characteristic, and multicomponent alloy, the B, S-mRh/NF displays a high NH 3 yield of 11.88 μg/h/cm 2 at −0.1 V and Faraday efficiency of 38.42% at −0.05 V in neutral electrolyte. This work offers an effective strategy for the rational design of nonmetal-doped porous Rh electrocatalysts with self-supported structure, which would be highly potential for the electrochemical ammonia synthesis.
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高影响因子
ELECTROCHIMICA ACTA
·
2021
·
IF 6.901
Haihua Wu,Zhihua Wei,Junying Yin,Sen Jiang,Jiahao Wu,Shuanghao Zheng,Jinpeng He,Xin Xu,Yunfang Gao
Bimetallic sulfides have been suggested as a novel class of electrode materials for supercapacitors (SCs) due to their high conductivity, rich redox active sites and wide operating potential window. To improve the property, tremendous efforts have been devoted to controlling the morphology, structure and size of bimetallic sulfides. We report here a strategy to achieve Ni-Co sulfide hollow nanoboxes with rich lattice interfaces and widespread mesopores via ion-exchange process. The lattice interfaces in the nanoboxes play a key role in improving the performance by developing more active sites. The thin nano-shell with porous structure makes it highly permeable for efficient ion diffusion, yet shortens the electron transport pathway. Such synergistic effects endow the Ni-Co sulfide hollow nanoboxes with high specific capacity of 789.0 C g − 1 at 1 A g − 1 and excellent rate capability of 82.1% capacity retention at 20 A g − 1 . Quantitative analysis of capacitive contribution sheds light on the rapid charge-discharge kinetics. Additionally, the as-fabricated hybrid SC , using optimized Ni-Co sulfide (Ni/Co molar ratio: 1/1) as anode and active rice husk carbon as cathode, exhibits a high energy density of 46.7 Wh kg −1 at power density of 400 W kg −1 and remarkable cycling stability of 82.7% at 5 A g − 1 after 10,000 cycles, demonstrative of potential application for high-performance SCs.
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高影响因子
ACS Applied Nano Materials
·
2022
·
IF 6.14
Bo Zhang,Yi Chen,Haonan Zheng,Changhao Li,Lili Ma,Hong Zhang,Baoxiang Wang,Chuncheng Hao
Herein, composites of Co-doped graphitic C3N4 nanosheets and TiO2 nanoparticles (Co-C3N4 NSs/TiO2 NPs) were prepared through a two-step synthetic strategy, and their electrorheological (ER) performance under varied electric field strengths was also researched. The microstructure, chemical elements, and surface morphology of materials were studied thoroughly by scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray powder diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, Brunauer–Emmett–Teller (BET) test, and X-ray photoelectron spectroscopy (XPS) measurements. The presence of TiO2 NPs and g-C3N4 was confirmed by XRD and FTIR results. Typical SEM and TEM images revealed the apparent sheet-like nanostructure of Co-C3N4, and the filling of TiO2 NP in-layers was discovered. Meanwhile, BET results indicated the abundant pore structure of Co-C3N4 NSs/TiO2 NP composites. The ER performances of Co-C3N4 NSs/TiO2 NP composites, including shear stress, shear viscosity, and ER efficiency, were examined under different electric field strengths with a high-quality electrorheometer. Interestingly, the obtained Co-C3N4 NSs/TiO2 NP composites exhibited an excellent ER property including an unexpected ER efficiency (up to 196), superior platform area, obvious dielectric loss peak, and high shear stress (more than 600 Pa at 3.0 kV/mm), showing wide application prospects as electrorheological materials.
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高影响因子
ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Guofeng Jia,Faqiang Li,Jue Wang,Suqin Liu,Yuliang Yang
A dual substitution strategy is introduced to Co-free layered material LiNi0.5Mn0.5O2 by partially replacing Li and Ni with Na and Al, respectively, to achieve a superior cathode material for lithium ion batteries. Na+ ion functions as a “pillar” and a “ cationic barrier” in the lithium layer while Al3+ ion plays an auxiliary role in stabilizing structure and lattice oxygen to improve the electrochemical performance and safety. The stability of lattice oxygen comes from the binding energy between the Ni and O, which is larger due to higher valences of Ni ions, along with a stronger Al–O bond in the crystal structure and the “cationic barrier” effect of Na+ ion at the high-charge. The more stable lattice oxygen reduces the cation disorder in cycling, and Na+ in the Li layer squeezes the pathway of the transition metal from the LiM2 (M = metal) layer to the Li layer, stabilizing the layered crystal structure by inhibiting the electrochemical-driven cation disorder. Moreover, the cathode with Na–Al dual-substitution displays a smaller volume change, yielding a more stable structure. This study unravels the influence of Na–Al dual-substitution on the discharge capacity, midpoint potential, and cyclic stability of Co-free layered cathode materials, which is crucial for the development of lithium ion batteries.
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高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2019
·Vol. 166
·期 15
·B1491
·
IF 3.12
Xiaoying Liu,Wenbin Li,Tianqin Zeng,Silu Zhang,Bijing Zhou,Muyi Li,Peng Zhao,Chang Peng
Heteroatom doped carbon materials have attracted intense attention in constructing electrochemical sensors because of their outstanding electrocatalytic performance. Up to now, most of the researches were focused on the electrochemical application of single heteroatom doped carbon microspheres. In this work, N, P-co-doped carbon microspheres (NP-CMs) modified electrode was developed as highly sensitive electrochemical sensor for acetaminophen. NP-CMs were acquired by the calcination of products from the one-pot reaction of dopamine and 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO). Experimental results revealed that NP-CMs showed better electrocatalytic performance compared with N-doped carbon microspheres. Under the optimal conditions, the response of NP-CMs/GCE showed a linear relationship with acetaminophen concentration from 0.07 μM to 30 μM, the linear equation was Y = 0.01356X+0.7417 and the detection limit was 40 nM (S/N = 3). The recoveries of the NP-CMs modified GCE for the assay of acetaminophen in human serum samples were from 94.0% to 106.0%. It was believed that N, P-co-doped carbon microspheres have a great potential in the design of novel pharmaceutical analysis methods.
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高影响因子
RARE METALS
·
2020
·Vol. 40
·期 7
·1753-1761
·
IF 2.161
Li Jiang-Wei,Song Qi,Li Jiang-Bing,Yang Sheng-Chao,Gao Yan-Shan,Wang Qiang,Yu Feng
Abstract For better performances of Ni-based catalysts at low temperatures, Ni/SiC catalyst doped with a little amount of additive La was successfully prepared. The catalytic CO methanation activity tests showed that 3%La–Ni/SiC catalyst was excellent at a low reaction temperature (95.9% CO conversion and 85.1% CH 4 selectivity at 250 °C) with a superior stability compared with Ni/SiC (3.4% CO conversion and 0% CH 4 selectivity at 250 °C). This can be attributed to that the addition of La can markedly improve the dispersibility of active metal Ni and reduce the particle sizes of Ni nanoparticles or clusters, and can also regulate the interaction between active components and supports. Moreover, the high thermal conductivity and thermal stability could avoid the generation of hot spots in the catalyst bed. These results will promote the development of highly active Ni-based catalysts for the low-temperature methanation reaction. Graphic Abstract
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高影响因子
危险品化学品经营许可证（带存储）