Journal of Materials Chemistry A
·
2019
·Vol. 7
·期 22
·13762-13769
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IF 10.733
Yong Jiang,Jin-Feng Liao,Yang-Fan Xu,Hong-Yan Chen,Xu-Dong Wang,Dai-Bin Kuang
Solar-driven CO2 conversion for chemical fuel production has been regarded as an effective strategy to alleviate environmental and energy issues. In this study, we constructed a novel composite catalyst film, in which CsPbBr3 nanocrystals (NCs) were loaded on a hierarchical branched ZnO nanowire (BZNW)/macroporous graphene scaffold (CsPbBr3 NC/BZNW/MRGO). This well-designed multi-dimensional architecture rationally integrated the excellent visible-light absorption capability of CsPbBr3 NCs, and fast charge transport and improved CO2 capture ability afforded by ZnO nanowire-branched macroporous graphene. Due to this favorable synergistic effect, a boosted photocatalytic performance was achieved with a photoelectron consumption rate of 52.02 μmol gcat−1 h−1 under visible light irradiation, which is 4.98 and 1.65 times higher than that of CsPbBr3 NC (10.44 μmol gcat−1 h−1) and CsPbBr3 NC/MRGO (31.52 μmol gcat−1 h−1), respectively. Furthermore, desirable CH4 selectivity of up to 96.7% was achieved.
研究领域:
材料科学
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环境科学
·
能源科学
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产品关联
DOI
高影响因子
Separation Science Plus
·
2022
·Vol. 5
·期 9
·513-519
·
IF 0
Yanni Huang,Jia Chen,Gafang Fu,Chi Zhang,Hongdeng Qiu
This work reported the preparation and evaluation of a 2D porous graphene as the stationary phase for gas chromatography with high-resolution performance from non-polar to polar structural isomers. As a result, the dynamically coated porous graphene capillary column has a film thickness of about 16 μm. After aging treatment at different temperatures, the porous graphene capillary column exhibited high thermal stability up to 300°C. In addition, the porous graphene capillary column has good column repeatability and reproducibility. The retention time RSDs are 2.61–3.90% ( n = 3) during the days and 4.58–4.78% ( n = 3) column-to-column. This work demonstrates the advantageous separation performance of a good potential for the porous graphene as a new stationary phase for gas chromatography analysis.
研究领域:
分析化学
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材料科学
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产品关联
DOI
International Journal of Electrochemical Science
·
2023
·
IF 1.5
Fengping Liu,Wei Huang,Zhenfa Zhang,Cuizhong Zhang,Qing Huang,Gang Xiang,Meiyan Liang,Jinyun Peng
In this work, a novel electrochemical sensor based on sulfur and nitrogen co-doped porous graphene (SNPG) is developed for the simultaneous detection of Cd 2+ and Pb 2+ by in situ plating bismuth film. The large effective surface area and doped sulfur and nitrogen in porous graphene supply active sites with high affinity toward Cd 2+ and Pb 2+ by electrostatic interaction to improve the sensor performance, and the bismuth film improves the stripping voltammetric performance by forming bismuth-metal (Cd, Pb) alloys. Under optimized conditions, this sensor exhibits linearity in the range of 0.05-2 μM for Cd 2+ and Pb 2+ with a low detection limit of 0.02 μM for Cd 2+ and 0.008 μM for Pb 2+ . Moreover, the proposed sensor was applied for the simultaneous detection of Cd 2+ and Pb 2+ in tap water with satisfactory results, suggesting that SNPG is a promising electrode material for detecting heavy metal ions.
研究领域:
材料科学
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环境科学
·
分析化学
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产品关联
DOI
PubMed
高影响因子
Journal of Materials Chemistry A
·
2019
·Vol. 7
·期 38
·22054-22062
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IF 10.733
Wenqiang Wang,Jie Jin,Yiyang Wu,Wenyi Zhang,Hao Jiang,Xingwei Li,Gengchao Wang
It is still a big challenge to integrate intrinsic modification and self-standing structure construction into graphene via a rapid and facile approach. Herein, we report a sampling and quick in situ chain reduction technology to prepare nitrogen-doped porous graphene frameworks. In this process, easily dispersible graphene serves as an effective receptor for microwave absorption and initiates the reduction of graphene oxide; the reduced part of GO becomes the microwave-absorbing receptor to cause a “chain reduction”, which allows the NPGFs to form in 3–5 s. The as-prepared graphene frameworks maintain the long-range layered structure of the precursor film, while the holey graphene sheets loaded with nanoparticles form a networked structure in the short range. Furthermore, the hierarchical framework with a high specific surface area shows interesting applications in supercapacitors and oil–water separation. The assembled compressible supercapacitor delivered a volumetric energy density of 12.3 mW h cm−3 at a power density of 0.42 W cm−3 and exhibits stable performance under compression. In addition, the graphene frameworks exhibited reusability with mechanical squeezing and extremely high volumetric absorption capacity of 100–243 g cm−3 for different oils and organic solvents, which is much higher than that in other reports (the performance index is ∼1 g cm−3). This study provides a new way to construct a multi-functional graphene self-standing structure, which presents potential application value in catalysis, energy storage, and environmental protection.
研究领域:
材料科学
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能源存储
·
环境工程
✓ 已验证
DOI
高影响因子
MATERIALS CHEMISTRY AND PHYSICS
·
2020
·
IF 3.408
Junbo Liu,Huilong Liu,Na Lin,Yingxi Xie,Shigen Bai,Zhiran Lin,Longsheng Lu,Yong Tang
This study demonstrated a facile method to fabricate super-hydrophilic 3D porous graphene with high capillary force and ultra-fast spreading characteristic by direct laser writing on KMnO 4 -coated polyimide (PI) films. Highly oxidized laser-induced graphene (OLIG) was obtained with dominated sp 2 carbon referring from Raman spectroscopy and X-ray diffraction. In addition, abundant oxygen functional groups and a 3D porous scaffold structure with foam-like flakes were produced based on the results of X-ray photoelectron pattern and scanning electron microscopy. OLIG showed ultra-fast spreading properties that water drops can spread completely within dozens of milliseconds. The morphology and chemical composition also render the new material with good capillary effect. The capillary rate-of-rise test with IR camera demonstrated that the wetted height of OLIG strip can reach around 16 mm within 5 min.
研究领域:
材料科学
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化学工程
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DOI
高影响因子
Journal of Materials Chemistry A
·
2015
·Vol. 3
·期 22
·11740-11744
·
IF 7.443
K. P. Annamalai,Jianping Gao,Lile Liu,Jun Mei,Woonming Lau,Yousheng Tao
This is the first report on the synthesis of nanoporous graphene/single wall carbon nanohorns (G/SWCNHs), a novel multicomponent of nanocarbons, using a facile hydrothermal method. Heterostructures were formed with interconnected graphene to support single wall carbon nanohorns (SWCNHs); meanwhile, SWCNHs prevented graphene nanosheets from stacking face-to-face. The samples were thoroughly characterized to illustrate their nanostructures and electrochemical properties. G/SWCNHs showed xerogel-like structures having ultra-micropores of ca. 0.6 nm and mesopores of 2–12 nm with the total nanopore volume of 0.20 cm3 g−1. The heterostructures of G/SWCNHs had an enhanced capacitance of 244 F g−1 in 1 M KOH with ultra fast charge–discharge and excellent rate capability, superior to reduced graphene oxide, SWCNHs and SWCNH composites. The nanohybrid achieved a capacitance retention of 99% after 1000 cycles at a current density of 10 A g−1, promising for practical high power density applications. This study also provides an environmentally friendly process for the preparation of better nanostructured carbons for electrochemical energy storage devices of high-performance.
研究领域:
材料科学
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电化学
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纳米技术
✓ 已验证
DOI
高影响因子
CARBON
·
2019
·
IF 7.466
Xiaocong Tian,Kang Tang,Hongyun Jin,Teng Wang,Xiaowei Liu,Wei Yang,Zhicheng Zou,Shuen Hou,Kun Zhou
Micro-pseudocapacitors (MPCs) are prospective power source candidates with compatible sizes as well as superior power densities for miniaturized electronic devices; however, their limited capacitive charge storage characteristics are still hindering their further development. Herein, an optimized 3D printing technique is employed to build remarkable reduced holey graphene oxide (rHGO) supported MPC microelectrodes. In such microelectrodes, the presence of macroscale pores introduced through freeze drying is beneficial to the accessibility to electrolyte ions . Moreover, with two additional pore modals including the microscale pores from pseudocapacitive nanoparticles stacking and nanoscale in-plane holes formed by rational HGO engineering, the MPC microelectrodes offer an enhancement in both electrical and ionic transports. The resultant 3D-printed planar MPCs exhibit a remarkable device specific charge storage capacity of 241.3 mC cm −2 , which is approximately 1.7-fold that of a non-optimized one and much higher than most reported planar micro-supercapacitors. Superior rate capability and high capacity retention (91% capacity retention after 11000 charge and discharge cycles) are also achieved. Our porosity engineering strategy combined with 3D printing is expected to serve as a facile and general design in the roadmap for next-generation state-of-the-art customized electrochemical energy storage devices.
研究领域:
材料科学
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电化学储能
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产品关联
DOI
高影响因子
Advanced Materials Interfaces
·
2018
·Vol. 5
·期 5
·1701261
·
IF 4.834
Huanlong Liu,Yufeng Tang,Wei Zhao,Wei Ding,Jijian Xu,Chenliang Liang,Zhichao Zhang,Tianquan Lin,Fuqiang Huang
Nonmetal-dual doped graphene has attracted considerable attention as high-performance anode material for lithium-ion batteries (LIBs) due to the synergistic effects of heteroatom dopants. Herein, nitrogen and halogen (including Cl, Br, and I) dual-doped graphene is successfully synthesized by a general wet chemical method and lithium storage performance of N, Cl codoped graphene as anode material for LIBs is investigated in detail. The dual-doped heteroatoms introduce abundant defects and expand the interlayer spacing of graphene to benefit lithium insertion and extraction. When used as a typical anode material, the N and Cl dual-doped porous graphene reveals a high specific capacity of 1200 mA h g −1 at 0.1 A g −1 and 1010 mA h g −1 at 1.0 A g −1 . The as-prepared sample exhibits superior cycling performance, whose specific capacity remains 95% at 5.0 A g −1 after 1800 cycles. The excellent performance mainly stems from the synergistic effect of structure modification and heteroatom doping, and the capacitive effects are dictated by kinetical analysis. The synthesized nitrogen and halogen dual-doped porous graphene is a promising anode material for LIBs.
研究领域:
材料科学
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能源科学
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产品关联
DOI
高影响因子
Journal of Water Process Engineering
·
2022
·
IF 7.34
Hridam Deb,Md Zahidul Islam,Arsalan Ahmed,Md Khalid Hasan,Md Khurrom Hossain,Huifeng Hu,Chaoying Chen,Shujuan Yang,Yong Zhang,Juming Yao
Due to high surface area, large delocalized pi (π) electrons, and tunable chemical attributes, porous graphene Nanomaterials (PGN) are exceptionally fascinating adsorbents for environmental decontamination applications. A facile wet-chemical exfoliation is used to synthesize exfoliated Graphene, leading to low-temperature treated porous reactive graphene Nano-adsorbents (APG), observing dye adsorption and removal of dissolved toxic contents. Various systematic characterization techniques are employed to investigate and correlate the physical and chemical moieties between APG and its counterpart Graphene oxide (GO), resorting to the structural properties, optimized surface functionality, adsorption characteristics, and mechanisms. The distinctive average crystal size of 4.49 Å for APG is observed compared to GO (5.7 nm) and Graphite (71 nm). A large specific surface area (SSA) of APG is estimated as 589.06 m 2 g −1 with a “slit-like” porous structure and induced surface roughness , distinct from observed materials (graphite 3.91m 2 g −1 and GO 84.05 m 2 g −1 ). Results demonstrate that methyl blue (MB) adsorptive removal capacity (821.05 mgg −1 ) reaches 99.69% within 120 min, and adsorption follows the Langmuir isotherm and pseudo-2nd-order kinetic models. Interestingly, as-synthesized adsorbent accommodates substantial demineralization by reducing chemical oxygen demand (COD) over 98% with total dissolved solids (TDS), remaining well below the permissible limit. Above all, results advocate that APG can be identified as a promising low-cost adsorbent.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
NANOTECHNOLOGY
·
2015
·Vol. 27
·期 5
·055702
·
IF 3.821
Xitao Guo,Hengchang Bi,Amina Zafar,Zheng Liang,Zhixiang Shi,Litao Sun,Zhenhua Ni
Three-dimensional (3D) carbon nano-materials, e.g. a graphene sponge (GS) are promising candidates for the removal of pollutants and the separation of oil and water. A systematic study on how oils or organic solvents disperse in the porous structures of 3D carbon nano-materials, and the factors affecting their sorption process, would be beneficial for designing a superior sorbent with desirable porous structures. Here, confocal Raman spectroscopic imaging was utilized to explore the absorption and desorption processes of dodecane (a constituent in petroleum products) in 3D porous GS with different pore size. It was found that dodecane predominately locates within the interior pores composed of reduced graphene oxide (rGO) sheets, which provide storage spaces for the absorbed molecules. The larger pore GS has a higher absorption capacity and faster desorption rate compared to the smaller one, which is due to the higher pore volume and weaker interaction with the absorbed molecules. A possible mechanism was also proposed to explain the role of porous macrostructures on the absorption and desorption properties of GSs.
研究领域:
材料科学
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环境科学
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DOI
高影响因子
CHEMOSPHERE
·
2021
·
IF 7.086
An Ding,Zixiao Ren,Yuehua Zhang,Jun Ma,Langming Bai,Bo Wang,Xiaoxiang Cheng
Membrane technology has been widely used in the fields of drinking water treatment with the advantages of pollutants separation. However, membrane fouling has become main obstacle in further application. Graphene oxide (GO) and its functionalized derivatives are considered to be ideal membrane modification materials of membrane fouling control. However, GO coated membranes were suffered from serious flux decline which raises challenges for GO modification. In this study, porous holey graphene oxide (HGO) was synthesized by hydrothermal etched GO to modify UF membranes. Water permeability of HGO membrane was more than twice that of GO membrane at the loading of 0.08 g/m 2 . At the optimal loading of 0.08 g/m 2 , the rejection rate of HGO coated membrane on natural organic matter (NOM) such as bovine serum albumin (BSA), sodium alginate (SA) and humic acid (HA) was increased from 55%, 29%, 58%–85%, 72%, 92%, and the contact angle was reduced from 71° to 35° with the HGO coating amount of 0.04 g/m 2 . Finally, the membrane fouling resistance distribution of each HGO membrane was analyzed given HA as model pollutant, and the effects of HGO on mitigating the organic fouling of Polyethersulfone (PES) membranes were discussed. The total fouling resistance decreased from 3.45 to 1.73 with HGO coating, the irreversible fouling decreased by 62.86%–95.83%. Standard blocking was dominated during filtration. It was also found that increasing the loading of HGO could delay the conversion of pore blocking to the cake layer. Overall, HGO coating has an application prospect for membrane fouling control.
研究领域:
环境科学
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材料科学
·
水处理技术
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产品关联
DOI
PubMed
高影响因子
JACS Au
·
2023
·
IF 8
Chunyu Yuan,Hongfei Yin,Huijun Lv,Yujin Zhang,Jing Li,Dongdong Xiao,Xiaoyong Yang,Yongzheng Zhang,Ping Zhang
Given the rapid recombination of photogenerated charge carriers and photocorrosion, transition metal sulfide photocatalysts usually suffer from modest photocatalytic performance. Herein, S-vacancy-rich ZnIn2S4 (VS-ZIS) nanosheets are integrated on 3D bicontinuous nitrogen-doped nanoporous graphene (N-npG), forming 3D heterostructures with well-fitted geometric configuration (VS-ZIS/N-npG) for highly efficient photocatalytic hydrogen production. The VS-ZIS/N-npG presents ultrafast interfacial photogenerated electrons captured by the S vacancies in VS-ZIS and holes neutralization behaviors by the extra free electrons in N-npG during photocatalysis, which are demonstrated by in situ XPS, femtosecond transient absorption (fs-TA) spectroscopy, and transient-state surface photovoltage (TS-SPV) spectra. The simulated interfacial charge rearrangement behaviors from DFT calculations also verify the separation tendency of photogenerated charge carriers. Thus, the optimized VS-ZIS/N-npG 3D hierarchical heterojunction with 1.0 wt % N-npG exhibits a comparably high hydrogen generation rate of 4222.4 μmol g–1 h–1, which is 5.6-fold higher than the bare VS-ZIS and 12.7-fold higher than the ZIS without S vacancies. This work sheds light on the rational design of photogenerated carrier transfer paths to facilitate charge separation and provides further hints for the design of hierarchical heterostructure photocatalysts.
研究领域:
材料科学
·
光催化
·
纳米技术
✓ 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）