Materials Today Chemistry
·
2023
·
IF 7.3
Yang Du,Yunxiu Wang,Zhuofan Cao,Jie Ding,Zifeng Guo,Hengjia Shao,Yang Li,Juyang Yan,Renqing Sun,Xintao Zhang,Tao Sun,Fuyi Jiang,Caifu Dong
Metal sulfides with high capacity, morphology-controlled, and facile synthesis are considered as potential anodes for Na-ion batteries. However, the conductivity and structural stability of electrode materials are still hampered by its inherent low conductivity and obvious volume changes during cycling. Herein, Cu 7.2 S 4 nanoparticles anchored on reduced graphene oxide (Cu 7.2 S 4 /RGO) are successfully prepared by solvothermal and thermal processes. The product, Cu 7.2 S 4 /RGO-10, not only features optimized the amount of RGO , but also delivers a large reversible capacity (314.4 mAh g −1 at 2 A g −1 ), good cycling stability (with a capacity fading of 0.11% per cycle from 2nd to 400th) and excellent rate capability (209 mAh g −1 at a high current density of 20 A g −1 ), making it the promising anode material for SIBs . Kinetics analysis clarifies that the high ion diffusion coefficient and the pseudo-capacitance contribution are important reasons for the superior performance. As expected, sodium-ion full cells (Cu 7.2 S 4 /RGO//Na 3 V 2 (PO 4 ) 3 ) also show good cycling stability.
研究领域:
材料科学
·
储能
·
电化学
·
纳米材料
✓ 已验证
DOI
高影响因子
Desalination and Water Treatment
·
2024
·
IF 1
Mingyue Piao,Xue Peng,Huishi Du,Hongxue Du,Wei Zhang,Yuwei Sun,Honghui Teng
Cadmium (Cd) emissions have a negative impact on both human health and the environment. Although nano zero-valent iron (nZVI) offers a lot of potential for water pollution treatment, it has been constrained by its instability and ease of aggregation. For the elimination of Cd(II) from aqueous solution, nZVI/MCM supported nZVI (nZVI/MCM-41/rGO) was designed to improve its dispersion and stability. It had a rough, porous structure with apparent Fe (0) crystallinity and slight rGO crystallinity. On the surface of nZVI/MCM-41/rGO, several oxygen-containing groups were detected. The specific surface area was 15.94 cm 2 /g, and the pore diameter was concentrated at 23.82 nm. The best performance was occurred at pH 6 with an adsorbent dosage of 2 g/L, and a maximum adsorption capacity of 31 mg/g was achieved after 600 min. Cd(II) removal process was well fitted with second-order kinetic, Langmuir and Freundlich isotherm. The thermodynamic parameter was also analyzed and proved that it was an endothermic (ΔH° > 0) and spontaneous (ΔG° < 0) progress. During adsorption, the crystal type and functional groups of nZVI/MCM-41/rGO did not change, but Fe (0) was oxidized.
研究领域:
环境科学
·
材料科学
·
水处理
·
纳米技术
·
吸附技术
✓ 已验证
DOI
高影响因子
RSC Advances
·
2014
·Vol. 4
·期 28
·14441-14446
·
IF 3.708
Hui Zhang,Anjian Xie,Cuiping Wang,Haisheng Wang,Yuhua Shen,Xingyou Tian
As a result of their lightweight properties and high dielectric loss, graphene and their composites have attracted great attention for potential applications in wave absorption. Herein, we report room temperature conditions for the synthesis of a 3D composite hydrogel composed of reduced graphene oxide nanosheets and Fe3O4 nanoparticles (RGO–Fe3O4). The experimental results show that the composite has an interconnected 3D porous network with micrometer-sized pores, and that the Fe3O4 nanoparticles with a small size of about 5–10 nm are uniformly dispersed onto the thin graphene nanosheets. The as-prepared RGO–Fe3O4 composite hydrogel shows excellent microwave absorbability compared with previously reported nanocomposites based on graphene and Fe3O4. The obtained composite with a coating layer thickness of only 2.5 mm exhibits a maximum absorption of −47.9 dB at 10.1 GHz. In particular, the product with a coating layer thickness of only 2.0 mm shows a bandwidth of 5.3 GHz (from frequency of 11.3–16.6 GHz) corresponding to reflection loss at −10 dB (90% absorption). Additionally, the fabrication method is simple, low cost and easily done on a large scale. This further confirms that nanoscale Fe3O4 particles on graphene networks give the composite hydrogel the ability to realize practical applications for wave absorption.
研究领域:
材料科学
·
纳米技术
·
电磁波吸收
·
复合材料
✓ 已验证
DOI
高影响因子
Nanomaterials
·
2023
·Vol. 13
·期 4
·752
·
IF 5.3
Xiaoyan Bai,Tianqi Cao,Tianyu Xia,Chenxiao Wu,Menglin Feng,Xinru Li,Ziqing Mei,Han Gao,Dongyu Huo,Xiaoyan Ren,Shunfang Li,Haizhong Guo,Rongming Wang
Constructing a heterogeneous interface using different components is one of the effective measures to achieve the bifunctionality of nanocatalysts, while synergistic interactions between multiple interfaces can further optimize the performance of single-interface nanocatalysts. The non-precious metal nanocatalysts MoS2/NiSe2/reduced graphene oxide (rGO) bilayer sandwich-like nanostructure with multiple well-defined interfaces is prepared by a simple hydrothermal method. MoS2and rGO are layered nanostructures with clear boundaries, and the NiSe2nanoparticles with uniform size are sandwiched between both layered nanostructures. This multiple-interfaced sandwich-like nanostructure is prominent in catalytic water splitting with low overpotential for oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) and almost no degradation in performance after a 20 h long-term reaction. In order to simulate the actual overall water splitting process, the prepared nanostructures are assembled into MoS2/NiSe2/rGO||MoS2/NiSe2/rGO modified two-electrode system, whose overpotential is only 1.52 mV, even exceeded that of noble metal nanocatalyst (Pt/C||RuO2~1.63 mV). This work provides a feasible idea for constructing multi-interface bifunctional electrocatalysts using nanoparticle-doped bilayer-like nanostructures.Keywords:nanoparticle-doped bilayer-like nanostructures;multiple interfaces;overall water splitting;dual function;non-precious metal catalysis
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2022
·Vol. 12
·期 48
·31415-31423
·
IF 4.036
Yujie Ma,Xindong Wei,Kedeerya Aishanjiang,Yi Fu,Jiamei Le,Hailong Wu
As a narrow band-gap semiconductor, cuprous oxide (Cu2O) has a relatively high conduction band that can exhibit high driving force for the photocatalytic generation of hydrogen under visible light. Besides, its adjustable morphologies and abundant source also make it possible to be employed as a theoretically optimal photocatalyst. However, the low charge migration and poor stability commonly limit its practical application, and various strategies have been explored in previous studies. In this study, we have novelly utilized Au nanorod (NR) and nanobipyramid (NBP) nanocrystallites as well as rGO nanosheets to boost the photocatalytic activity of Cu2O over hydrogen generation. The ternary rGO wrapped Au@Cu2O with a yolk–shelled structure (y-Au@Cu2O/rGO) was synthesized by a handy and controllable method. When excited by solar light (λ > 400 nm), it was found that the H2 yields of Cu2O/rGO, y-Au nanoparticle@Cu2O/rGO, y-Au NR@Cu2O/rGO, and y-Au NBP@Cu2O/rGO were increased in the order of 248, 702, 1582 and 1894 μmol g−1 in 4 h. The outstanding photocatalytic performances of y-Au NR@Cu2O/rGO and y-Au NBP@Cu2O/rGO could be attributed to the combination function of quick electron transfer of rGO and abundant near-infrared-light-driven hot carriers on Au NRs and NBPs that could inject into Cu2O and then a quick transfer to rGO to participate in H2 reduction. Besides the above results, it was also found that Cu2O maintained good stability after several cycling photocatalysis tests, which could be ascribed to the migration of holes from Cu2O to Au that prevented the photooxidation of Cu2O. This study may give a guide to fabricating controllable and effective photocatalysts based on plasmonic metals, semiconductors, or two-dimensional nanosheets, which possess full-solar-light-driven photocatalytic activities in the future.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ELECTRONIC MATERIALS
·
2022
·Vol. 51
·期 7
·3831-3842
·
IF 2.047
Zhang Baozhong,He Jintao,Tian Panpan,Lv Lina,Zhu Huina,Xie Lingling,Liu Xiaolong,He Baoshan
In this study, based on the specific binding of nucleic acid aptamers (Apts) to 3,3′,4,4′-tetrachlorobiphenyl (PCB77), an ultrasensitive electrochemical aptasensor was constructed for the detection of PCB77. The Apts were captured by hairpin (HP) deoxyribonucleic acid capture probes through complementary base pairing. The large surface area of reduced graphene oxide (rGO) combined with Ag-Cu 2 O significantly improved the efficiency of electron transfer on the electrode surface and provided a large number of binding sites for HP capture probes. Streptavidin (SA)-modified CeO 2 /AuPt was used as signal-generating material to amplify electrical signals cooperatively with Ag-Cu 2 O/rGO, and it was also combined with biotin-modified nucleic acid Apts via the SA-biotin system to form signal labels, which significantly improved the sensitivity of the aptasensor. The morphology and size of the synthesized materials were characterized by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The internal structure and composition of the materials were further analyzed by x-ray photoelectron spectroscopy (XPS), x-ray diffraction (XRD), and Fourier transform infrared (FT-IR) spectroscopy. The sensor assembly process was confirmed by electrochemical impedance spectroscopy (EIS) and cyclic voltammetry (CV). Differential pulse voltammetry (DPV) was used to optimize the experimental conditions and evaluate the performance of the sensor. Under optimal conditions, the detection limit of the aptasensor was 0.069 ng/L, and the dynamic range was 0.1–10 3 ng/L, providing a high-quality platform for PCB77 detection. Graphical Abstract
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Meiyu Yuan,Changxin Peng,Junjie Fu,Xuening Liu,Zihan Wang,Shiyu Xu,Sheng Cui
Accurate and convenient detection of nitrogen dioxide (NO 2 ) in the air, which is harmful to human health, is vital. However, it is difficult for many NO 2 detection devices to achieve high sensitivity at room temperature. In this work, we synthesized zeolite-imidazolate-frameworks-8 (ZIF-8) nanoparticles and zinc oxide/reduced graphene oxide (ZnO/rGO) aerogel by low-temperature synthesis and sol-gel method. The aerogel composite materials were investigated by X-ray diffractometer (XRD), scanning electron microscopy (SEM), Brunaue-Emmette-Teller (BET), and Raman spectroscopy . The gas-sensitive element prepared by the material with the mass ratio ZIF-8 to rGO is 5:1 possesses excellent selectivity and higher sensitivity (3.21) to 100 ppm NO 2 at room temperature. Reduced graphene oxide (rGO) provides more gas transmission and diffusion channels for improving sensitivity because of a three-dimensional porous structure. When NO 2 is exposed, electrons transfer into p-n heterostructure formed by rGO and ZnO composite to achieve the purpose of sense. In this study, the material preparation method is relatively simple and efficient, which is of profound significance to accurately detect the variation of NO 2 concentration in air at room temperature.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Lanlan Tian,Yuanlin Xie,Jing Lu,Tiefeng Liu,Qiang Hu,Yongneng Xiao,Xiaoquan Zhu,Xintai Su
Iron-nitride based materials are considered to be one of the most promising anode materials for Lithium-ion batteries (LIBs) due to their good electrical conductivity and high theoretical capacity. However, iron-based nitrides are easily deteriorated in the long-term lithiation/delithiation process, which reduces the electrochemical stability and limits their large-scale application. Here, we report a Fe 3 N or Fe 2 N reduced graphene oxide nanosheets (rGO) composite prepared through a facile annealing process under different atmosphere (NH 3 /Ar) from Fe 3 O 4 original material. The voids in cubic structure of Fe 3 N or Fe 2 N can be beneficial to buffer volume changes during lithiation/delithiation processes and provide active sites, and the rGO is helpful to improve electrical conductivity of composites. Moreover, the proportion of Fe 3 N in the composite is higher than that of Fe 2 N, indicating that more cubic structure can be released in Fe 3 N/rGO. Therefore, Fe 3 N/rGO showed a higher capacity (513 mA h g −1 after 200 cycles at a current density of 0.5 A g −1 ), better rate performance and more stable cycling performance. This work provides a new direction for the construction of iron-based nitrides with different valence states as anode active materials for LIBs using Fe 3 O 4 as raw material.
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Jiayi Wang,Shuhang Hu,Qi Tang,Jian Xu,Nianxi Xu,Shansheng Yu,Xiaoyi Wang,Hongwei Tian
Currently, to solve the problem of electromagnetic radiation, it is imperative to develop a thin, lightweight absorber, with a wide bandwidth and an excellent absorption ability. In this study, SiC and CoFe 2 O 4 were combined on reduced graphene oxide (rGO) with immobilized rGO and SiC nanoparticles and varying amounts of CoFe 2 O 4 nanoparticles . A facile one-pot hydrothermal technique was employed to prepare four rGO/SiC/CoFe 2 O 4 composite samples with varied CoFe 2 O 4 concentrations. The electromagnetic properties of rGO/SiC/CoFe 2 O 4 composites were affected by CoFe 2 O 4 content, and CoFe 2 O 4 content was varied to change the electromagnetic properties of composites. The rGO/SiC/CoFe 2 O 4 composite samples were prepared at a graphene oxide (GO) mass of 0.5 g, SiC mass of 0.25 g, and CoFe 2 O 4 mass of 1.5 g, and this composite sample exhibited the best microwave absorption consumption. At 60 wt% of rGO/SiC/CoFe 2 O 4 composite sample, the RL min at 7.4 GHz with a thickness of 2.43 mm was −62.39 dB, and efficient absorption of broadband (EAB) was 1.4 GHz (6.8–8.2 GHz). The EAB was 3.2 GHz (11.8–15 GHz), and the RL min was −59.77 dB at 13.2 GHz with a thickness of 1.39 mm. The RL min at 17.2 GHz was −65.49 dB, and the EAB was 2.3 GHz (15.7–18 GHz), despite a thickness of only 1.06 mm. The rGO/SiC/CoFe 2 O 4 composite comprised carbon materials, magnetic metals, and semiconductors. High-performance microwave absorption was achieved by the introduction of more than one loss mechanism and coordination and supplementation of multicomponent functions. The proposed carbon/semiconductor/magnetic composite material provides a feasible solution for the preparation of excellent microwave absorbing materials in the future.
✓ 已验证
产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2021
·Vol. 46
·期 2
·857-867
·
IF 3.591
Ziwen Wang,Baichuan Lu,Xiaokun Zhang,Shixiang Lu,Wenguo Xu
Herein, we have prepared a new nanocomposite Bi2S3/Co3O4/rGO/Ni foam substrate electrode through hydrothermal synthesis and an annealing process. SEM clearly shows that the Bi2S3/rGO/Ni foam substrate and Co3O4/rGO/Ni foam substrate prepared under the experimental conditions are cuboid-shaped and flower-shaped, respectively. However, the shape of Bi2S3/Co3O4/rGO/Ni foam is a perfect combination of the above two. We call this cuboid full of petals a flower-rod-like shape. The BET test found that the specific surface area of this unique morphology is as high as 152.7 cm2 g−1, which is beneficial towards charge transfer and improves the overall electrochemical reaction performance of the electrode. In addition, electrochemical performance tests displayed that the Bi2S3/Co3O4/rGO/Ni foam electrode had a high specific capacitance of 2214.3 F g−1 at 1 A g−1. The highest energy density of the Bi2S3/Co3O4/rGO/Ni foam//activated carbon asymmetric supercapacitor is 133.4 W h kg−1 (the corresponding power density is 800.1 W kg−1), and the highest power density is 8568.2 W kg−1 (the corresponding energy density is 70.5 W h kg−1). Additionally, under the condition of 10 A g−1 current density, the capacitance retention rate is still extremely high: 99.4% after 10 000 continuous charge and discharge tests. In practical application, two Bi2S3/Co3O4/rGO/Ni foam//activated carbon asymmetric supercapacitors in series can make a 2.5 V bulb maintain a high brightness for 1 minute.
✓ 已验证
产品关联
DOI
高影响因子
COMPOSITES PART B-ENGINEERING
·
2021
·
IF 9.078
Hewei Zhao,Xiaolong Zeng,Tian Zheng,Shaojia Liu,Jie Yang,Rui Hao,Fengshi Li,Lin Guo
High capacity, ultra-fast charge/discharge rate, and long cycling life are external targets for Lithium-ion batteries (LIBs) to satisfy modern energy storage, but it is still challenging to realize them simultaneously. Here, we report a three-dimensional (3D) porous rGO@SnO 2 nanosheets aerogel (rGO@SnO 2 NSA) based on in-situ growing two-dimensional (2D) SnO 2 nanosheets on graphene oxide (GO@SnO 2 NS), subsequent controllable assembly and reduction. The 2D structure of SnO 2 can shorten the electron-transfer path, and the porous architecture of the 3D aerogel endows the aerogels with external ion-transfer channels and exceptional capacitive contribution. As a result, the LIBs using our 3D aerogels as anodes can endure ultrafast charge/discharge (10 A g −1 ) rate and exhibit ultra-long cycling life with a high energy density (512.1 mAh g −1 after 10,000 cycles). For application exploration, the LiFePO 4 /rGO@SnO 2 NSA cell also possesses excellent energy storage performance (364.5 mAh g −1 after 100 cycles). Our electrode design strategy of combining 2D active materials and 3D porous architecture provides a new path to develop next-generation rechargeable energy storage devices.
✓ 已验证
产品关联
DOI
高影响因子
PLASMA SCIENCE & TECHNOLOGY
·
2021
·Vol. 23
·期 11
·115503
·
IF 1.567
Xinghao LIU,Cheng CHENG,Zimu XU,Shuheng HU,Jie SHEN,Yan LAN,Paul K CHU
Tetracycline (TC) is an antibiotic mainly used in livestock production and respiratory infection. Traditional methods are not effective in removing TC from solution. In this study, TC was degraded by gas–liquid plasma in the presence of rGO-TiO2 in solution. The rGO-TiO2 was prepared by modified hummers and hydrothermal method. The electrical and optical properties of the gas–liquid discharge plasma were studied and the produced long-lived reactive species were analyzed by spectrophotometer. The degradation efficiency of TC was improved by 41.4% after plasma treatment for 12 min in presence of 30 mg l−1 rGO-TiO2 compared to that with plasma alone. The degradation efficiency increased with increasing discharge power, but as the initial concentration was increased from 20 to 80 mg l−1, the degradation efficiency of TC decreased. The initial pH had no significant effect on the degradation of TC. The intermediate products were determined by UV–vis spectrophotometry and ESI (+)–MS, and the degradation mechanism was analyzed. The reactive species, including O3, ·OH, and H2O2, etc., produced in the plasma/catalyst system attracted electron-rich functional groups (amino group, aromatic ring, and double bond). Therefore, the gas–liquid plasma/catalyst system could be an effective and promising method for pharmaceutical wastewater treatment in future.
✓ 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）