Journal of Materials Chemistry A
·
2014
·Vol. 3
·期 7
·3739-3747
·
IF 0
Weiwei Liu,Hua Li,Qingping Zeng,Huanan Duan,Yiping Guo,Xuefa Liu,Chongyang Sun,Hezhou Liu
Thermally reduced graphene networks (TRGN) with low densities, less than 10 mg cm−3, were synthesized by thermal reduction of graphene oxide/poly(vinyl alcohol) networks. To evaluate the electromagnetic wave absorption properties of TRGN, TRGN were nondestructively backfilled with wax via a vacuum-assisted method. The as-prepared TRGN/wax composites, using integrated TRGN as fillers rather than directly dispersing graphene sheets in wax, exhibit better electromagnetic wave absorption capabilities because of the 3D conductive frameworks, which could generate more effective electrical loss in terms of dissipating the induced current in the TRGN/wax composites. Specifically, for the TRGN/wax composite with ∼1 wt% TRGN, the minimum reflection loss reaches −43.5 dB at 12.19 GHz with a thickness of 3.5 mm, and the bandwidth of reflection loss less than −10 dB (90% absorption) can reach up to 7.47 GHz. More importantly, our work provides a promising approach for constructing graphene-based composites with strong electromagnetic wave absorption ability at very low filler loadings.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2017
·
IF 2.843
Jiaojiao Jiang,Zipeng Xing,Meng Li,Zhenzi Li,Xiaoyan Wu,Mengqiao Hu,Jiafeng Wan,Nan Wang,Alexey Sergeevich Besov,Wei Zhou
In situ Ti3+/N-codoped 3D urchinlike black TiO2 (b-N-TiO2) is synthesized via hydrothermal treatment with an in situ solid-state chemical reduction method, followed by annealing at 350 °C in argon. The results indicate that N and Ti3+ was codoped into the lattice of anatase TiO2. The prepared b-N-TiO2, with a narrow bandgap of ∼2.43 eV, possesses a three-dimensional (3D) urchinlike nanostructure, which is composed of fiberlike architecture with a length of 200–400 nm and a width of 25 nm. The visible-light-driven photocatalytic degradation rate of Methyl Orange and hydrogen evolution rate for b-N-TiO2 are 95.2% and 178 μmol h–1 g–1, respectively, which are ∼3 and ∼8 times higher than those of pristine TiO2. The excellent photocatalytic activity is mainly attributed to synergistic effect of the N and Ti3+ codoping narrowing the bandgap, and unique 3D urchinlike architecture favors the separation and transport of photogenerated charge carriers and offers more surface-active sites.
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
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Honglei Shuai,Renzhi Liu,Wenxuan Li,Xiaojian Yang,Hui Lu,Yongping Gao,Jing Xu,Kejing Huang
Layered molybdenum disulfide (MoS 2 ) shows tremendous prospect as cathode material for aqueous zinc-ion batteries (AZIBs) due to the two-dimensional zinc ions (Zn 2+ ) diffusion channels and tunable interlayer spacing. However, it is subjected to sluggish insertion/extraction kinetics, inferior electronic conductivity and inadequate active capacities. Herein, a three-dimensional (3D) interconnected MoS 2 /multi-walled carbon nanotubes (MWCNTs) framework is proposed to address these issues. Importantly, the MWCNTs cores offer interconnection routes for fast electrons and zinc ions transport, the expanded spacing of MoS 2 interlayer with 1.05 nm can facilitate rapid Zn 2+ intercalation/extraction, and the confined MoS 2 layers in inner MWCNTs can mitigate the agglomeration and restacking of MoS 2 nanosheets. Benefitting from the confined structural configuration, sufficient active surface and 3D structural stability, the MoS 2 /MWCNTs as AZIBs cathode delivers a large initial reversible capacity of 218.3 mAh/g and high coulombic efficiency of 78.2 % at 0.1 A/g. Additionally, the 3D interconnected cathode maintains nearly intact structure after a fierce galvanostatic charge/discharge process, resulting in large retained capacities of 126.3 mAh/g at 1 A/g after 650 cycles and 101.1 mAh/g at 3 A/g after 1000 cycles. This work offers a novel strategy for the structure design of two-dimensional materials to develop high-performance cathodes for AZIBs.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2023
·
IF 4.5
Huaiyu Li,Chenxi Xu,Wei Wang,Gangyong Li,Junlin Huang,Liang Chen,Zhaohui Hou
The development of single atom catalysts is considered as a hotspot in the field of electrocatalysis. As the representative of single atom catalysts, metal and nitrogen co–doped carbon (M N C) attracts worldwide attentions due to its great potential in the application of oxygen reduction reaction (ORR). However, the actual preparation of M N C still confronts with tedious procedure, harsh condition and relatively low loading of single metal atom. In this work, we successfully prepare high–loading 3D Co N C architecture by a facile oxidation polymerization followed by pyrolysis process employing 3D nitrogen–doped graphene hydrogel (NGH) and pyrrole (PY) as the reaction precursors. Benefitting from the individual advantages of 3D NGH and PY, the resultant 3D Co N C possesses unique 3D architecture, high–loading single Co atom (2.74 wt%), large specific surface area and enriched mesopores, which benefit the exposure of sufficient catalytic sites and facilitate electrons transfer and ions transport, thus generating much enhanced ORR performance. When used as the cathode catalyst for zinc–air batteries (ZABs), it shows comparable performance with commercial Pt/C catalyst. Clearly, our finding offers a good guidance on the design and synthesis of advanced high–loading single atom catalysts.
研究领域:
材料科学
·
电催化
·
能源存储与转换
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2023
·
IF 7.2
Fengzhan Si,Yan Zhang,Yue Liang,Xiaomin Kang,Jianwen Liu,Xian-Zhu Fu,Jing-Li Luo
Water decomposition is the most promising system for developing renewable energy, but the sluggish kinetics of the oxygen evolution reaction (OER) is the key limiting factor. Recently, inorganic nanomaterials have been widely used as an effective catalyst for the stimulation of OER kinetics, for which the subsequent dispersion and the current collector are essential. We present a three-dimensional NiFe-layered double hydroxide (NiFe-LDH) synthesized by electrochemical corrosion , with increased electrochemical performance for electrocatalytic water splitting. Electrochemical measurements reveal that the NiFe-LDH has a lower Tafel slope of 46 mVˑdec −1 compared with the NiFe foam. The resulting electrode had a current density of 50 mAˑcm −2 and a remarkably low overpotential of 150 mV. Theoretical calculations and experimental observations showed and explained NiFe-LDH-90 electrode has high alkaline medium endurance, implying excellent OER electrocatalytic activity . The produced composite is expected to bring new insights into the design of foam electrocatalyst materials for OER.
研究领域:
材料科学
·
电化学
·
可再生能源
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Junkai Zhao,Mingzhu Xie,Kaimeng Yang,Daina Wei,Ce Zhang,Zhaolong Wang,Xiaojing Yang
Silicon (Si) is considered as one of the most promising candidates for next-generation lithium-ion battery (LIB) anode due to its high theoretical capacity. However, the drastic volume change of Si anodes during lithiation/delithiation processes leads to rapid capacity fade. Herein, a three-dimensional Si anode with multiple protection strategy is proposed, including citric acid-modification of Si particles (CA@Si), GaInSn ternary liquid metal (LM) addition, and porous copper foam (CF) based electrode. The CA modified supports strong adhesive attraction of Si particles with binder and LM penetration maintains good electrical contact of the composite. The CF substrate constructs a stable hierarchical conductive framework, which could accommodate the volume expansion to retain integrity of the electrode during cycling. As a result, the obtained Si composite anode (CF-LM-CA@Si) demonstrates a discharge capacity of 3.14 mAh cm −2 after 100 cycles at 0.4 A g −1 , corresponding to 76.1% capacity retention rate based on the initial discharge capacity and delivers comparable performance in full cells. The present study provides an applicable prototype of high-energy density electrodes for LIBs.
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Zheng Lu,Shuai Wang,Yuan Fang,Wenjian Wang,Xiaohong Gao,Rui Zhao,Weidong Xue
Three-dimensional boron, nitrogen co-doped carbon nanotubes encapsulated with nickel nanoparticles (3D Ni@BNCNTs) composite have been prepared by a simple pyrolysis process using flower-like Ni 2 B alloy nanosheets (Ni 2 B NS) as catalyst. This technique enables one-step regulation of the growth diameter and structure of CNTs as well as in situ doping of B atoms. The doping of B and N atoms generates dipolar polarization and increases the dielectric loss. The prepared 3D Ni@BNCNTs samples exhibit excellent electromagnetic wave absorption capacity due to the abundant interface polarization, rich defective polarization, good conduction loss and good magnetic loss synergistically. 3D Ni@BNCNTs has a minimum reflection loss of −63.7 dB with a matching thickness of 1.7 mm and a broad effective absorption bandwidth which can reach 4.56 GHz at 1.5 mm with the merely filler loading ratio of 20 wt%. Therefore, this work developed a promising electromagnetic wave absorber for ultra-lightweight, ultra-thin and high-efficiency.
研究领域:
材料科学
·
电子工程
✓ 已验证
DOI
高影响因子
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
·
2013
·Vol. 15
·期 37
·15660-15668
·
IF 3.829
Jungang Hou,Chao Yang,Huijie Cheng,Zheng Wang,Shuqiang Jiao,Hongmin Zhu
Highly efficient hydrogen production can be achieved by three-dimensional (3D) architectures of CdS quantum dots (QDs) incorporated in the porous assembly of marigold-like ZnIn2S4 heterostructures coupled with graphene, leading to an efficient electron transfer between them and the enhancement of the ZnIn2S4 photostability. The as-prepared samples were characterized by X-ray diffraction, electron microscopy, Brunauer–Emmett–Teller analysis, X-ray photoelectron spectroscopy, UV-vis diffuse reflectance absorption spectra, and photoluminescence spectra. Especially, 3 wt% CdS QDs decorated ZnIn2S4 heteroarchitectures showed a high rate of H2-production at 1.9 mmol h−1, more 2.7 times than that of ZnIn2S4. The rate was further increased to 2.7 mmol h−1 with a high quantum efficiency of 56% using the 3 wt% CdS QDs decorated ZnIn2S4 composites coupled with 1 wt% graphene (about 4 times higher than that of the pure ZnIn2S4). Moreover, the CdS QDs/graphene/ZnIn2S4 exhibited strong durability due to the high hydrothermal stability of the flower-like structure and the inhibition of CdS leaching owing to its strong interaction with ZnIn2S4. The excellent photocatalytic performance is ascribed to the enhanced light absorption and the improved separation of photogenerated carriers. This finding highlights the validity of 3D semiconductor heterostructures as effective building blocks for exploring efficient visible-light-active photocatalysts.
研究领域:
材料科学
·
光催化
·
纳米材料
·
能源化学
·
半导体物理
✓ 已验证
DOI
高影响因子
Materials Today Communications
·
2020
·
IF 2.678
Erhui Zhang,Weifeng Liu,Xuguang Liu,Zongbin Zhao,Yongzhen Yang
A facile strategy of spacer functionalization-lyophilization-annealing treatment is designed to synthesize nitrogen-doped carbon microspheres/graphene aerogel (N-CMS/GA) with three-dimensional (3D) hierarchical structure, high compressibility and excellent capacitive property. The as-synthesized PPy by weak oxidant (FeCl 2 /H 2 O 2 ) owns high water wettability favorable for the self-assembly of the precursor into high-performance graphene-based aerogel. The N-CMS/GA exhibits a Young’s modulus of 8.7 kPa, even compressed to ε = 90%, it could still rebound to nearly its initial volume. Besides, high specific capacitance (346 F g −1 ) at a current density of 1 A g −1 , superior rate capability (92 % of initial capacitance value kept at the current density increasing from 0.1 to 2.0 A g −1 ) and excellent cycle life (98.7% after cycling 10 000 times in 1.0 M KOH electrolyte) can be obtained. This research provides contributions to large scale and simple preparation of graphene-based hybrid aerogels for application in flexible devices whose mass and volume are limited seriously.
研究领域:
材料科学
·
能源存储
✓ 已验证
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2020
·
IF 7.1
Li Lv,Pengfei Cheng,Yinglin Wang,Luping Xu,Bao Zhang,Chao Lv,Jian Ma,Yue Zhang
In this paper, the preparation process and gas sensing performance of Sb-doped three-dimensional spinel ferrite (3D ZnFe 2 O 4 ) with well-assembled macroporous spherical structure have been investigated. Sb-doped 3D ZnFe 2 O 4 macroporous spheres (MPs) were prepared through a one-step ultrasonic spray pyrolysis (USP) method by sacrificing self-assembly sulfonated polystyrene spheres (S-PSs). The interconnected macropores (an average pore size about 200 nm) can be observed in the as-prepared materials by SEM and TEM characterization, which provided the dual functions of accelerating the diffusion of gas molecules and providing more reactive sites. The XPS analysis showed that the element Sb existed as Sb 5+ in doped samples. Compared with the pure 3D ZnFe 2 O 4 MPs (response = 18), 0.5 % Sb-doped sample presented the response of 35.5–100 ppm n-butanol at 250 °C, and also revealed excellent selectivity and long-term stability to n-butanol. The greatly enhanced sensing performance of Sb-doped simples can be attributed to the construction of 3D spheres with interconnected macroporous structures and the modification of Sb doping. The formation of p-n junctions at interface through Sb doping also improved the sensing performance for n-butanol. In addition, the relative sensing mechanism of Sb-doped 3D ZnFe 2 O 4 MPs for n-butanol sensing has been discussed in detail.
研究领域:
材料科学
·
传感器技术
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2019
·Vol. 9
·期 17
·9620-9628
·
IF 3.049
Qiuli Wei,Tongjun Liu,Yuanyuan Wang,Liyi Dai
Herein, three-dimensional (3D) nitrogen-doped graphene with large surface areas and abundant porous structures was prepared by a hydrothermal synthesis method, which served as a novel support to enhance the catalytic properties of noble metal catalysts for the solvent-free selective oxidation of benzyl alcohol. The as-prepared samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), Raman spectroscopy, Fourier transform infrared (FTIR) spectroscopy, and Brunauer–Emmett–Teller (BET) method. The results clearly showed that the introduced N-containing group prevented the aggregation of graphene sheets and provided more structural defects to maximize the number of exposed active sites. The three-dimensional structure can provide a unique porous structure and large specific surface area. Moreover, the three-dimensional structure makes the recycling and reuse of the catalyst easier. The combination of these properties results in the reduction of the average particle size of metal palladium to 3.2 nm; this significantly increases the catalytic activity of the catalyst. The three-dimensional N-doped graphene aerogel-supported Pd nanoparticle (3D Pd/NRGO) composites exhibit excellent catalytic activity for the solvent-free selective oxidation of benzyl alcohol to benzaldehyde by molecular oxygen at 90 °C for 3 hours under atmospheric pressure, resulting in a 72.2% conversion of benzyl alcohol with 94.5% selectivity for benzaldehyde. In addition, the catalytic efficiency shows no obvious loss even after six repeated cycles. Thus, 3D Pd/NRGO can be used as an efficient, easily separable, recyclable, and stable catalyst for the solvent-free selective oxidation of benzyl alcohol under relatively mild conditions.
研究领域:
材料科学
·
催化化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
DESALINATION
·
2016
·
IF 4.412
Bo Feng,Kai Xu,Aisheng Huang
In the present work, we reported the preparation of graphene oxide framework (GOF) membrane through vacuum filtration of GOF suspension for seawater desalination . Firstly, 1, 4-phenylene diisocyanate (PDI) was selected as cross-linking for covalent modification of GO nanosheets to prepare three-dimensional GOF. Secondly, micron-thickness GOF membrane was prepared on the PDI-modified α-Al 2 O 3 tube through vacuum filtration of GOF suspension. The developed GOF membrane was evaluated for seawater desalination by pervaporation . Attributing to a three-dimensional structure, the resistance of the mass transferring through GOF membrane can be reduced, thus the water flux of the GOF membranes can be increased significantly. For an 18 μm thickness of GOF membrane at 90 °C, the water flux is 11.4 kg·m − 2 ·h − 1 and ion rejection is over 99.9% for desalination of 3.5 wt.% seawater. Further, the GOF membrane also displays high stability for seawater desalination. This high separation performance combined with high stability and facile fabrication road of the GOF membrane suggests that the developed GOF membrane is a promising candidate for desalination of seawater and brackish water.
研究领域:
材料科学
·
环境工程
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）