ACS Omega
·
2020
·
IF 2.87
Shaochun Zhang,Linlin Zang,Tianwei Dou,Jinlong Zou,Yanhong Zhang,Liguo Sun
Biomass wastes are abundant and common in our daily life, and they are cost-effective, promising, and renewable. Herein, collected willow catkins were used to prepare a hydrophilic biochar composite membrane, which was placed in a tree-like evaporation configuration to simulate a natural transpiration process. The strong light absorption (∼96%) of the biochar layer could harvest light and convert it into thermal energy, which then is used to heat the surrounding water pumped by a porous water channel via capillary action. A hydrophilic light-absorber layer remarkably increased the attachment sites of water molecules, thereby maximizing the use of thermal energy. At the same time, hierarchically porous structure and large specific surface area (∼1380 m2 g–1) supplied more available channels for rapid water vapor diffusion. The as-prepared composite membrane with a low-cost advantage realized a high evaporation rate (1.65 kg m–2 h–1) only under 1 sun illumination (1 kW m–2), which was improved by roughly 27% in comparison with the unmodified hydrophobic composite membrane. The tree-like evaporation configuration with excellent heat localization resulted in the evaporator achieving a high solar-to-vapor conversion efficiency of ∼90.5%. Besides, the composite membrane could remove 99.9% sodium ions from actual seawater and 99.5% heavy metal ions from simulated wastewater, and the long-term stable evaporation performance proved its potential in actual solar desalination. This work not only fabricated an efficient evaporator but also provided a strategy for reusing various natural wastes for water purification.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2012
·
IF 4.951
Yingying Hu,Zhaoyin Wen,Xiangwei Wu,Jun Jin
Porous carbon films with tunable pore structure to modify the β″-alumina electrolyte surface are fabricated through a low-cost and direct wet chemistry method with glucose and poly(methyl-methacrylate) (PMMA) as precursors. FTIR analysis confirms the effective connection between the carbohydrate and the pore-forming agent PMMA through hydrogen bonds . The experimental results indicate that the structural parameters of the porous carbon films, including mean pore size and film thickness, can be tuned simply by adjusting the amount of PMMA in the glucose/PMMA composite. This soft-template-assisted method could be readily extended to modify any other ceramic surfaces. The porous carbon films are demonstrated to greatly improve the wettability of the β″-alumina ceramics by molten sodium . Na/β″-alumina/Na cells are used to investigate the interfacial properties between sodium and the β″-alumina electrolyte. The results obtained at 350 °C reveal that the polarization behavior of the cell is alleviated by the porous coating . This work represents a successful method to coat ceramics with porous carbon and offers a promising solution to overcome the polarization problems of the sodium/β″-alumina interface in Na-based batteries .
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
DALTON TRANSACTIONS
·
2025
·
IF 3.3
Fang Wang,Mengjuan Xu,Jinyu Ma,Yiming Li,Jiao Zhang,Zhengguo Zhang,Shixiong Min
Porous carbon membrane-based bifunctional electrodes (NixCoyP@CSA) are developed by direct carbonization followed by vapor-phase phosphidation of Ni2+/Co2+-crosslinked starch aerogel. During the carbonization and phosphidation processes, the crosslinked starch framework is transformed into a hierarchically porous, conductive, and mechancially strong carbon membrane while the Ni2+/Co2+ species are concurrently converted into embedded carbon-coated NixCoyP nanoparticles with a loading exceeding 40 wt%. Benefitting from hierarchically porous structure, excellent wettability, abundant active sites, the best NiCo2P@CSA electrode exhibits a high areal specific capacitance (Ca) of 9.41 F cm-2 at 2 mA cm-2, a volumetric capacitance (CV) of 115.0 F cm-3 at 20 mA cm-3, and a NiCo2P loading-based mass capacitance (Cm) of 1108.9 F g-1 at 0.2 A g-1, in a three-electrode system. In addition, an asymmetrical supercapacitror (SC) assembled by paring NiCo2P@CSA and activated carbon/Ni foam (AC/NF) exhibits a high Ca of 2.46 F cm-2 at 2 mA cm-2, an energy density of 0.41 mWh cm−2 at the power density of 1.1 mW cm−2, and a 75 % capacitance retention with a unit coulombic efficiency after 10000 cycles. In addition, the NiCo2P@CSA can also be directly used as a binder-free bifunctional electrode for electrocatalytic water splitting, requiring low overpotentials of 192.4 and 418.5 mV to achieve a current density of 100 mA cm-2 for hydrogen evolution reaction (HER) and oxygen evolution reaction (OER), respectively, and it exhibits superior durability in both HER (>100 h at 20 mA cm-2) and OER (>40 h at 20 mA cm-2).
研究领域:
材料科学
·
能源化学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Solar RRL
·
2022
·Vol. 7
·期 2
·2200803
·
IF 9.173
Fenghua Liu,Yunjiao Gu,Yigu Hu,Zan Wang,Yuesheng Ning,Robert Bradley,Deyuan Lou,Binyuan Zhao,Weiping Wu
Solar-energy-powered interfacial evaporation is the most meaningful strategy for energy utilization, water desalination, and mineral purification. It can achieve high efficiency, low-density energy, and sustainable harvest and utilization. However, the microstructure and surface/interface design still lead to a balance between solar–thermal conversion, water conduction, and thermal management, which also determines the efficiency of photothermal interfacial evaporation. Here, a free-standing, ultrathin carbon film with a tunable nanopore diameter is prepared and used as a blackbody layer for solar photothermal evaporation. By 3D reconstruction methods, the effect of pore structure on interfacial evaporation is systematically studied. Hierarchical porous carbon film with an average pore size of about 300 nm exhibits outstanding photothermal evaporation performance, reaching up to 1.96 kg m −2 h −1 with excellent stability. Ultra-hydrophobic, optically enhanced absorption graphene array is constructed on the carbon film surface through femtosecond laser nanoprocessing, further increasing the evaporation rate to 2.12 kg m −2 h −1 (1 sun) and 5.55 kg m −2 h −1 (3 suns).
研究领域:
材料科学
·
能源技术
·
环境工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2016
·
IF 5.557
Fen Ran,Kuiwen Shen,Yongtao Tan,Bowu Peng,Shaohua Chen,Weijie Zhang,Xiaoqin Niu,Lingbin Kong,Long Kang
Homopolymer PAN and triblock copolymer PAN- b -PMMA- b -PAN synthesized by RAFT polymerization were used to fabricate activated hierarchical porous carbon membranes by combining phase inversion , carbonization , and HNO 3 activation method; during the preparation process, a lot of micro- and meso-pores generated because of phase separation of PAN and microphase separation of PAN- b -PMMA- b -PAN. The hierarchical porous structure shortened ions transport paths and facilitated the rapid migration of electrolyte ions . When the polymer membrane was prepared by the casting solution with 5 wt% of PAN- b -PMMA- b -PAN and the electrochemical performance was tested at the current densities from 0.5 to 5 A g −1 , a high-end specific capacitance of 297.0 F g −1 and a capacitance retention of 75% were obtained in three-electrode configuration; this specific capacitance remained above 90% of initial value after 2000 cycles at 2 A g −1 in 6 M KOH aqueous solution. Moreover, symmetric supercapacitors assembled with the prepared materials achieved high energy density (15.8 Wh Kg −1 ) and power density (4000 W Kg −1 ) in 1 M Na 2 SO 4 solution. The unique features and structures endowed the electrode membrane with good capacitive performance in both three-electrode and two-electrode configuration, which can be used as electrode membranes for high-performance energy storage devices and other applications.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
CHINESE JOURNAL OF POLYMER SCIENCE
·
2015
·Vol. 34
·期 1
·23-33
·
IF 1.835
Wu Qing-yun,Liang Hong-qing,Li Meng,Liu Bo-tong,Xu Zhi-kang
Porous carbon membranes were favorably fabricated through the pyrolysis of polyacrylonitrile (PAN) precursors, which were prepared with a template-free technique-thermally induced phase separation. These carbon membranes possess hierarchical pores, including cellular macropores across the whole membranes and much small pores in the matrix as well as on the pore walls. Nitrogen adsorption indicates micropores (1.47 and 1.84 nm) and mesopores (2.21 nm) exist inside the carbon membranes, resulting in their specific surface area as large as 1062 m 2 /g. The carbon membranes were used to adsorb organic dyes (methyl orange, Congo red, and rhodamine B) from aqueous solutions based on their advantages of hierarchical pore structures and large specific surface area. It is particularly noteworthy that the membranes present a selective adsorption towards methyl orange, whose molecular size (1.2 nm) is smaller than those of Congo red (2.3 nm) and rhodamine B (1.8 nm). This attractive result can be attributed to the steric structure matching between the molecular size and the pore size, rather than electrostatic attraction. Furthermore, the used carbon membranes can be easily regenerated by hydrochloric acid, and their recovery adsorption ratio maintains above 90% even in the third cycle. This work may provide a new route for carbon-based adsorbents with hierarchical pores via a template-free approach, which could be promisingly applied to selectively remove dye contaminants in aqueous effluents.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
Small
·
2019
·Vol. 15
·期 44
·1902819
·
IF 10.856
Xiaojun Ruan,Jiangjiang Luo,Rui Wang,Yanbo Yao,Jingjiao Guan,Tao Liu
A nanometer-thick carbon film with a highly ordered pattern structure is very useful in a variety of applications. However, its large-scale, high-throughput, and low-cost fabrication is still a great challenge. Herein, microcontact printing (µCP) and direct laser writing carbonization (DLWc) are combined to develop a novel method that enables ease of fabrication of nanometer-thick and regularly patterned carbon disk arrays (CDAs) and holey carbon films (HCFs) from a pyromellitic dianhydride-oxydianiline-based polyamic acid (PAA) solution. The effect of PAA concentration and pillar lattice structure of the polydimethyl siloxane stamp are systematically studied for their influence on the geometrical parameter, surface morphology, and chemical structure of the finally achieved CDAs and HCFs. Within the PAA concentration being investigated, the averaged thickness of CDAs and HCFs can be tailored in a range from a few tens to a few hundred of nanometers. The µCP+DLWc-enabled electrically conductive CDAs and HCFs possess the characteristics of ease-of-fabrication, nanometer-thickness, highly regular and controlled patterns and structures, and the ability to form on both hard and soft substrates, which imparts usefulness in electronics, photonics, energy storage, catalysis, tissue engineering, as well as physical, chemical, and bio-sensing applications.
研究领域:
材料科学
·
纳米科技
·
生物医学工程
·
表面化学
·
微纳加工
✓ 已验证
DOI
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2024
·
IF 4.3
Qinli Ye,Miaomiao Wu,Qian Xu,Shuwen Zeng,Tao Jiang,Wei Xiong,Songyin Fu,Muhammad Danang Birowosuto,Chenjie Gu
The Surface-enhanced Raman scattering (SERS) is an attractive optical detecting method with high sensitivity and detectivity, however challenges on large-area signal uniformity and complex spectra analysis methods always retards its wide application. Herein, a highly sensitive and uniform SERS detection strategy supported by porous carbon film/WO 3-x nanosheets (PorC/WO 3-x ) based noble-metal-free SERS substrate and deep learning algorithm are reported. Experimentally, the PorC/WO 3-x substrate was prepared by high-temperature annealing the PorC/WO 3 films under the argon atmosphere. The defect density of the WO 3 was controlled by tuning the reducing reaction time during the annealing process. The SERS performance was evaluated by using R6G as the Raman reporter, it showed that the SERS intensity obtained on the substrate with the optimal annealing time of 3 h was about 8 times as high as that obtained on the PorC/WO 3 substrate without annealing treatment. And detection limit of 10 -7 M and Raman enhancement factor of 10 6 could be achieved. Moreover, the above optimal SERS substrate was utilized to detect flavonoids of quercetin, 3-hydroxyflavone and flavone, and a deep learning algorithms was incorporated to identify the quercetin. It revealed that quercetin can be accurately detected within the above flavonoids, and lowest detectable concentration of 10 -5 M can be achieved.
研究领域:
材料科学
·
分析化学
·
光学
·
机器学习
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Jianwei Li,Wei Chu,Qiang Gao,Hongming Zhang,Xinhai He,Bin Wang
Carbon-based materials have been recognized as a promising method to eliminate electromagnetic interference (EMI) shielding and electromagnetic (EM) wave absorption. However, developing lightweight, ultrathin, and efficient EM wave-shielding and wave-absorbing materials remains a challenge. Herein, a series of magnetic porous carbon composite films with a hierarchical network structure were fabricated via pyrolysis of porous polyimide (PI) films containing magnetic metallic salts of Fe(acac)3 and Ni(acac)2. After pyrolysis, the obtained uniform porous carbon films (CFs) possess a favorable EMI-shielding efficiency (SE) of 46 dB in the X-band with a thickness of ∼0.3 mm. In addition, a higher EMI SE of 58 dB can be achieved by increasing the thickness of the porous CF-20Ni to 0.53 mm. Moreover, the CF-20Ni composites also present effective EM wave-absorbing performance of RLmin = – 30.2 dB with a loading amount of 20 wt % at 13.0 GHz owing to the hierarchically conductive carbon skeleton, magnetic Ni nanoparticles, and dielectric interlaced carbon nanotube cluster within the micropores. These novel lightweight and ultrathin porous CFs are expected to be attractive candidates for efficient EM wave absorption and EMI shielding.
研究领域:
材料科学
·
电磁工程
·
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）