Journal of Energy Storage
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2024
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IF 8.9
X.U. Yang,Z.H.E.N.G. Leizhi,L.I.U. Chengbao,C.H.E.N. Feng,Q.I.A.N. Junchao,Q.I.U. Yongbin,M.E.N.G. Xianrong,C.H.E.N. Zhigang
Due to its special electron configuration, large number of electrochemical reactive sites, and a high theoretical specific capacitance, Ni 0.85 Se has great application potential for supercapacitor electrodes. However, the poor charge driving ability and easy aggregation of Ni 0.85 Se hinder the full utilization of its electrochemical reactive site, thus limit its practical application. Here, nano-rod-like highly crystalline graphitic carbon nitride (CCN) was synthesized via molten salt assisted method, and then CCN/Ni 0.85 Se composite nanomaterials were synthesized by hydrothermal induction. Through various characterization and electrochemical tests, nano-rod-like CCN not only improves the poor electrical conductivity and incomplete surface reactive site exposure of bulk g-C 3 N 4 prepared by traditional thermal polymerization, but also improves the charge dynamics and enrich the electrochemical active sites of sheets Ni 0.85 Se, and improves the electrochemical activity of the composite. On the base of results, CCN/Ni 0.85 Se-7 has the best specific capacitance of 1234 F g −1 at 1 A g −1 , which is significantly higher than that of pure phase Ni 0.85 Se (841.2 F g −1 ) and CCN (34.4 F g −1 ). The CCN/Ni 0.85 Se-7//AC two-electrode device exhibited a maximum energy density of 29.11 Wh kg −1 , a maximum power density of 8499.86 W kg −1 , and good capacitance retention ability of 81.46 % after 2000 cycles.
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高影响因子
ACS Applied Materials & Interfaces
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2016
·
IF 7.145
RongQin Ye,HuaBin Fang,Yan-Zhen Zheng,Nan Li,Yuan Wang,Xia Tao
A novel direct Z-scheme CoTiO3/g-C3N4 (CT-U) photocatalytic system with different weight percentage of CoTiO3 was synthesized using a facile in situ growth method for H2 evolution from water splitting. The as-prepared CT-U composites composed of 1D CoTiO3 microrod and 2D g-C3N4 nanosheet were characterized by various techniques including XRD, SEM, TEM, XPS, FTIR, and UV–vis. Results demonstrate that the CT-U composite photocatalysts were successfully fabricated, with intimate interfacial contact and heterojunction interaction between g-C3N4 and CoTiO3 which can significantly boost the photocatalytic activity compared with prinstine g-C3N4 and CoTiO3. The most enhanced H2-evolution rate of 858 μmol h–1 g–1 and high quantum efficiency (38.4% at 365 nm, 3.23% at 420 ± 20 nm) are achieved at an optimal 0.15% CT-U. Meanwhile, the 0.15% CT-U sample exhibits good photocatalytic stability in recycling H2 evolution. Accordingly, direct Z-scheme mechanism capable of leading efficient charge carrier separation and strong reduction ability for enhanced H2 production was proposed, and further evidenced by PL, photoelectrochemical analysis, and ESR assay.
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PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2016
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IF 3.299
Haiye Wang,Xinzhen Zhao,Chunju He
The polydimethylsiloxane modified silica (SiO 2 -g-PDMS) nanoparticles with hydrophilic core and hydrophobic shell are employed for the hybridization modification of PVDF ultrafiltration membrane to improve the separation and antifouling performances. The results suggest the modified SiO 2 -g-PDMS nanoparticles exhibit improved dispersion and significant amphiphilic characteristics, and the wetting properties of membrane surface and mimetic matrix of hybrid PVDF membranes are distinctly different with the contact angle values at 105° and 15°, respectively. In addition, the added SiO 2 -g-PDMS nanoparticles significantly improve the fouling repulsion and fouling release properties of hybrid PVDF membranes, the anti-adsorption ability and water flux recovery ratio (FRR-W) of hybrid PVDF membranes to the two typical pollutants of bovine serum albumin (BSA) and humic acid (HA) have been significantly improved. This article aims to provide a simple way to improve the antifouling performance of PVDF ultrafiltration membrane with dual-mode multi-functional modifier.
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MATERIALS RESEARCH BULLETIN
·
2016
·
IF 2.435
Ailan Qu,Xinmei Xu,Haolong Xie,Yangyu Zhang,Yuyu Li,Junxian Wang
A composite of graphitic carbon nitride and TiO 2 (g-C 3 N 4 /TiO 2 ) with enhanced photocatalytic hydrogen evolution capacity was achieved by calcining melamine and TiO 2 sol-gel precursor. Characterization results reveal that heating temperature had a great influence on the structure, surface area and properties of the composites. Compared with the polycondensation of pure melamine, the presence of TiO 2 precursor can promote the formation of melon at a low temperature. The highest photocatalytic activity of g-C 3 N 4 /TiO 2 (400) was achieved when the calcination was performed at 400 °C, exhibiting H 2 production rate of 76.25 μmol/h under UV–vis light irradiation (λ > 320 nm) and 35.44 μmol/h under visible light irradiation (λ > 420 nm). The highest photocatalytic performance of g-C 3 N 4 /TiO 2 (400) can be attributed to: (1) the strong UV–vis light absorption due to the narrow bandgap caused by synergic effect of TiO 2 and g-C 3 N 4 , (2) high surface area and porosity, (3) the effective separation of photo-generated electron-holes owing to the favorable heterojunction between TiO 2 and g-C 3 N 4 .
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JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL
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2016
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IF 3.958
Kainan Song,Feng Xiao,Lijuan Zhang,Fan Yue,Xiaoyu Liang,Jide Wang,Xintai Su
A hybrid nanomaterial comprising of one-dimensional W 18 O 49 nanowires grown on two-dimensional g-C 3 N 4 sheets was prepared by a facile solvothermal process. Photocatalytic activity of these materials for H 2 generation under visible light was evaluated. The optimum efficiency of W 18 O 49 /g-C 3 N 4 composite photocatalyst at a mass content of 30% was up to 4.5 times as high as that of the pure g-C 3 N 4 . The significantly enhanced performance of W 18 O 49 /g-C 3 N 4 composites was mainly attributed to the synergistic effect between the interface of W 18 O 49 nanowires and g-C 3 N 4 sheets, involving stronger light absorption in the visible range, faster transfer and more efficient separation of the photo-generated electron-hole pairs. In short, the W 18 O 49 /g-C 3 N 4 hybrid nanomaterial was demonstrated to be an effective photocatalyst for H 2 production.
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Molecular Catalysis
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2017
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IF 0
Feng-Yun Su,Wei-De Zhang
Relatively narrow visible light responsive region and high recombination probability of photogenerated charge carriers are the main barriers that limit the photocatalytic activity of graphitic carbon nitride (g-C 3 N 4 ). In this study, modified g-C 3 N 4 was synthesized by adding minor amount of ethylenediaminetetraacetic acid (EDTA) into urea as precursors for subsequent thermal polymerization. The thermal intermediate product ethylenediaminetetramethylene (EDTM) during decarboxylation of EDTA was grafted to the framework of g-C 3 N 4 by connecting adjacent 3,s-triazine units. The special chelate structure of EDTA leads to the distortion of g-C 3 N 4 to a nonplanar structure, which is responsible for extending the light harvesting around 500 nm, and consequently promoting the generation, separation and transfer of charge carriers. The H 2 evolution rate on an optimized EDTM-grafted g-C 3 N 4 photocatalyst (UCN-10) reaches 116.4 μmol h −1 , which is about 3.5 times of that on the pristine g-C 3 N 4 (UCN). The formation process of the grafted structure and the mechanism for the enhanced photocatalytic H 2 evolution over UCN-10 were proposed based on experimental results.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2017
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IF 3.582
Li Liu,Panru Hu,Wenquan Cui,Xingang Li,Zisheng Zhang
A novel visible-light-active CdS@g-C 3 N 4 photocatalyst was synthesized via a chemisorption method. This core@shell structure catalyst exhibited enhanced photocatalytic H 2 production activity under visible-light (λ ≥ 420 nm) irradiation. The nano-sheet g-C 3 N 4 was successfully coated on CdS nanoparticles with intimate contact. When the content of g-C 3 N 4 in the hybridized composite is 3 wt. %, the hydrogen-production rate of the CdS@g-C 3 N 4 is 2.5 and 2.2 times faster than pure CdS and bulk g-C 3 N 4 , respectively. Superior stability was also observed in the cyclic runs. The improvement in stability and activity result from the ability of the π-conjugated g-C 3 N 4 material in transporting photo-induced holes. The core@shell structure promoted separation of the photo-generated electron-hole pair and accelerated the emigration speed of the hole from the valence band of CdS. This effect also results in a greatly improved amount of hydrogen production . The possible mechanism for the photocatalytic activity and stability of CdS@g-C 3 N 4 are tentatively proposed.
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高影响因子
RSC Advances
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2017
·Vol. 7
·期 4
·2333-2341
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IF 3.108
Yanfang Yang,Jingjing Chen,Zhiyong Mao,Na An,Dajian Wang,Bradley D. Fahlman
Ultrathin graphitic carbon nitride (g-C3N4) nanosheets were synthesized via thermal exfoliation of bulk urea-derived g-C3N4 under an argon atmosphere. As a visible-light responsive photocatalyst, this material exhibits a much superior photocatalytic activity in pollution degradation and H2 evolution than bulk g-C3N4, as a result of the extended region of visible light response and the enhanced surface area of ultrathin g-C3N4 nanosheets. These findings may provide a promising and facile approach to the design of high-performance photocatalysts.
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JOURNAL OF HAZARDOUS MATERIALS
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2017
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IF 6.065
Wang Ren,Ying Zhang,Yu Zhu Fan,Jiang Xue Dong,Nian Bing Li,Hong Qun Luo
A resonance Rayleigh scattering (RRS) aptasensor was fabricated for detection of Pb 2+ via hairpin-like label-free substrate and G-wire for signal amplification. A hairpin-like DNA substrate contains a sequence in the loop labeled with ribonucleobase A and c-myc sequence in the stem. When hybridized with 8–17 DNAzyme in the presence of Pb 2+ , the sequence in the loop was activated and cleaved. Hundreds of c-myc sequences departing from the 8–17 DNAzyme yield nanowires superstructure called G-wire in the presence of Mg 2+ . The polymer G-wire was demonstrated by the RRS spectrum, polyacrylamide gel electrophoresis, and AFM. The RRS intensity was enhanced by the product G-wires, and the RRS signal at 370 nm was linear with the logarithm of Pb 2+ concentration in the range of 2.0 nM to 5.0 μM. This method was selective for Pb 2+ even coexisting with other metal ions at high concentrations and was successfully applied to the determination of Pb 2+ in real samples. The aptasensor holds a great promise for universal RRS sensing platform for sensitive detection of various metal ions just by changing the sequence of the probe in the loop and DNAzyme.
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高影响因子
JOURNAL OF CHROMATOGRAPHY B-ANALYTICAL TECHNOLOGIES IN THE BIOMEDICAL AND LIFE SCIENCES
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2016
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IF 2.687
Ying-Di Luo,Qi-Lei Zhang,Xiao-Ming Yuan,Wei Shi,Shan-Jing Yao,Dong-Qiang Lin
Adsorption selectivity is critical important for mixed-mode chromatography with specially-designed ligands. Human immunoglobulin G (hIgG), Fc and Fab fragments were used in the present work to evaluate adsorption behavior and binding selectivity of four mixed-mode resins with the ligands of 4-mercatoethyl-pyridine (MEP), 2-mercapto-1-methylimidazole (MMI), 5-aminobenzimidazole (ABI) and tryptophan-5-aminobenzimidazole (W-ABI), respectively. The resins showed an obvious pH-dependent adsorption behavior. High adsorption capacities were found at neutral pH for hIgG, Fc and Fab, and almost no adsorption happened under acidic conditions. An adsorption selectivity index was proposed to evaluate separation efficiency. High specificity of hIgG/Fc was found at pH 8.9 for MEP resin, and for W-ABI resin at pH 8.0 and 8.9. In addition, isothermal titration calorimetry was used to evaluate ligand-protein interactions. Finally, the separation of hIgG and Fc (1:1) was optimized with mixed-mode resins, and the best separation performance was obtained with W-ABI-based resin. Loading at pH 8.0 resulted in the flow through of Fc with purity of 90.4% and recovery of 98.8%, while elution at pH 3.6 provided hIgG with purity of 99.7% and recovery of 86.5%.
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高影响因子
APPLIED SURFACE SCIENCE
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2016
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IF 3.15
Kui Li,Feng-Yun Su,Wei-De Zhang
Carbon quantum dots (CQDs) were deposited onto graphite-like carbon nitride nanosheets (CNNS) to form CNNS/CQDs composites. The prepared CNNS/CQDs composites exhibit much higher photocatalytic activity under visible light irradiation than pure CNNS do. The CNNS/CQDs-7 sample displays the highest photocatalytic performance, with H 2 production rate of 116.1 μmol h −1 , which is three times of that over pure CNNS (37.8 μmol h −1 ). Photoluminescence spectroscopy and photoelectrochemical (PEC) analysis reveal that the CQDs are favorable for trapping electrons and promoting the separation of photogenerated electron-hole pairs in CNNS. A possible photocatalytic mechanism of the enhanced photocatalytic performance for H 2 generation over CNNS/CQDs will be proposed in this paper.
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高影响因子
ELECTROCHIMICA ACTA
·
2016
·
IF 4.803
Pengfei Wang,Hui Liu,Yuxing Xu,Yunfa Chen,Jun Yang,Qiangqiang Tan
Reducing the particle size is a straightforward way to increase the specific surface area of ruthenium oxide, which usually translates to the high specific capacitance for a supercapacitor. Herein, we report a facile strategy to fabricate ultrafine ruthenium oxides supported on various carbon-based substrates (carbon powders, carbon nanotubes, or reduced graphene oxides) as excellent electrode materials for a supercapacitor. The novelty of this work lies in its synthetic approach, which involves an aqueous synthesis of ruthenium nanoclusters under the control of pH value, and an air oxidation-based conversion process. In particular, owing to their ultrafine particle size, the as-prepared carbon-, carbon nanotube-, or reduced graphene oxide-supported ruthenium oxides exhibit specific capacitance as high as 879.1 F g −1 , 966.8 F g −1 and 1099.6 F g −1 , respectively, for a supercapacitor at a current density of 0.5 A g −1 . The specific capacitance maintains 98.4% (for carbon supports), 98.0% (for carbon nanotube supports) and 98.4% (for reduced graphene oxide supports) at current density of 1 A g −1 with good cycling stability. The remarkable simplicity and environmental friendliness of this synthesis may provide a liable quantity production route to produce ruthenium oxides as highly efficient electrode materials for a supercapacitor.
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