INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2020
·
IF 3.573
Jiuxuan Zhang,Chunhua Zhang,Hong Jiang,Yefei Liu,Rizhi Chen
Selective hydrogenation of phenol is a green strategy to produce cyclohexanone. Achieving high phenol conversion and cyclohexanone selectivity under mild conditions is a significant challenge in the design and synthesis of highly efficient catalysts. Herein, a highly efficient Pd@CN-rGO catalyst is synthesized by supporting Pd nanoparticles on the composite of ZIF-derived N-doped carbon and reduced GO (CN-rGO), which is prepared via annealing the composite of layered ZIF-L-Co and GO. The as-fabricated Pd1.2@CN-rGO-15 catalyst shows superior catalytic performance in phenol hydrogenation, and its turnover frequency (TOF) is 33.7 h–1, 3.2 times higher than that of Pd1.6/rGO and 1.5 times higher than that of Pd0.9@CN-rGO-0. The synergistic effect of CN and rGO leads to the uniform dispersion of Pd, high phenol adsorption ability, and strong antioxidizability of Pd, which contributes to the superior catalytic performance. More importantly, Pd@CN-rGO has good reusability in phenol hydrogenation. These findings will offer new insights into the development of high-performance catalysts for the selective hydrogenation of phenol.
研究领域:
化学工程
·
催化科学
·
绿色化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2016
·
IF 3.014
Bingrong Wang,Jiacheng He,Fangqing Liu,Lei Ding
In this study, Cu 2 O/CuO/reduced graphene oxide (rGO) was synthesized through a rapid and convenient microwave-assisted hydrothermal method . The crystal structure and morphology of the as-prepared product were characterized using X-ray diffraction (XRD), field-emission-scanning electron microscopy (FESEM), transmission electron microscopy (TEM), Raman spectroscopy , and X-ray photoelectron spectroscopy (XPS). The electrochemical performance of the novel Cu 2 O/CuO/rGO biosensor was investigated via cyclic voltammetry . The biosensor was evaluated for ascorbic acid (AA) detection and exhibited a wide linear range of 100 μM–1000 μM, a low detection limit of 0.301 μM, and a sensitivity of 1375.486 μA mM −1 cm −2 .
研究领域:
材料科学
·
分析化学
·
生物传感技术
✓ 已验证
产品关联
DOI
高影响因子
Environmental Science-Water Research & Technology
·
2019
·Vol. 6
·期 2
·303-311
·
IF 4.195
Chengxu Li,Shiyong Wang,Gang Wang,Shuaifeng Wang,Xiaoping Che,Duanzheng Li,Jieshan Qiu
Capacitive deionization (CDI) has developed rapidly due to its advantages of low energy consumption and eco-friendliness. In recent years, many researchers have devoted their efforts to fabricating new electrode materials in order to achieve superior desalination efficiency and excellent long-term recycling stability. Herein, a new CDI cathode material — an NH4V4O10/rGO (NHVO/rGO) composite — was synthesized using a simple hydrothermal process. The as-prepared ammonium vanadium bronze NH4V4O10 (NHVO) displayed a large 2D layer spacing, of about 1.0 nm, and was hence tested as a potential Na+-intercalating material. The graphene present in the composite played a significant role in improving the electrical conductivity of NHVO, greatly promoting its desalting efficiency. During desalination tests, an NHVO/rGO-based CDI system delivered a NaCl removal capacity of 20.1 mg g−1 at an applied voltage of 1.2 V in a 500 mg L−1 NaCl solution; that is, the NHVO/rGO composite displayed a remarkable salt removal performance. Due to the excellent desalination performance of this system, the NH4V4O10/rGO composite is expected to become an appealing candidate for enhancing the performance of CDI electrodes.
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 Physical Chemistry C
·
2022
·
IF 4.177
Ting Yu,Xin Li,Bin Chen,Yanxing Yang,Keng Xu,Yuan Liu,Wufei Gong,Cailei Yuan,Yong Yang
Crystal facet engineering and graphene modification are both effective means to improve the gas sensing performance of metal oxide semiconductors (MOSs) currently. However, research on the crystal facet effect and synergistic effect of graphene modification of p-type MOS sensors is relatively lacking. Here, p-type Co3O4 nanocrystals with controlled crystal facets ({112} and {100}) were in situ wrapped in the two-dimensional (2D) nanosheet network of graphene. It was found that bare {112} facets showed a significantly higher triethylamine sensing performance than {100} facets, implying a strong crystal facet effect. Interestingly, the triethylamine sensing performance of {112} facets was significantly improved after rGO modification, while the performance improvement of Co3O4 {100} was limited after rGO modification. Further study suggested that {112} facets contained more active Co3+ species and chemically adsorbed oxygen species than {100} facets, which promoted the adsorption of triethylamine and the subsequent sensing reaction. In addition, the strong electronic interaction between Co3O4 {112} crystal facets and rGO promoted efficient charge exchange through the heterogeneous interface. This work provides a new way to improve the gas sensing performance of Co3O4 through the synergistic effect of crystal facet engineering and graphene modification.
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
ACS Applied Materials & Interfaces
·
2018
·
IF 8.097
Junfang Ding,Liping Li,Huixia Li,Shaoqing Chen,Shaofan Fang,Tao Feng,Guangshe Li
Interfacial regulation offers a promising route to rationally and effectively design advanced materials for CO preferential oxidation. Herein, we initiated an interfacial regulation of CeO2–CuOx–RGO composites by adjusting the addition sequence of the components during the support formation. The presence of RGO along with the sequence tuning of the components is confirmed to survey the changes of the oxidation state of copper species, the content and distribution of the Cu+ site, and the synergistic interactions between Cu–Ce mixed oxides and reduced graphene oxide (RGO) over the catalysts. These catalysts were systematically characterized by inductively coupled plasma, X-ray diffraction, transmission electron microscopy/high-resolution transmission electron microscopy, hydrogen temperature-programmed reduction, X-ray photoelectron spectra, thermal gravimetric analysis, Raman spectra, and in situ diffuse reflectance infrared Fourier transform spectroscopy measurements. The results show that RGO is favorable for the generation of Cu+ and the dispersion of copper–cerium species in the as-prepared catalysts. Furthermore, by multi-interfacial regulation of the CeO2–CuOx–RGO composites, the catalyst CeO2/CuOx–RGO exhibits a strikingly high catalytic oxidation activity at a low temperature coupled with a broader operation temperature window (i.e., CO conversion >99.0%, 140–220 °C) in the CO-selective oxidation reaction, which has been attributed to the high content of the active species Cu+ enriched on the surface, the highly dispersed copper oxide clusters subjected to a strong interaction with ceria, and the synergistic interactions between Cu–Ce mixed oxides and RGO.
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
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2018
·
IF 4.229
Kewei Wang,Jinshan Tan,Zejia Lu,Shuai Chen,Xilin She,Huawei Zhang,Dongjiang Yang
The preparation of hydrogen evolution reaction (HER) electrocatalyst with high catalytic performance is a huge challenge. In this work, we develop a MoP/Fe 2 P/RGO composite as a electrocatalyst for HER. The MoP/Fe 2 P/RGO exhibits excellent electrocatalytic performance with a Tafel slope and an onset overpotential of 51 mV/dec and 105 mV, respectively. To drive 10 mA/cm 2 , it only requires a small over-potential of 156 mV. The high electrocatalytic HER activity is mainly due to the synergistic effect of MoP and Fe 2 P. In addition, the introduction of RGO not only prevents particle aggregation and coalescence during high temperature phosphating, but also improves the conductivity of the catalyst.
研究领域:
材料科学
·
电化学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
·
2024
·
IF 6.1
Tao Liu,Chang Jiang,Zekai Liu,Xuehui Zhang,Wenmin Zhao,Longfei Zeng,Lina Zhang
Reduced graphene oxide (rGO) with surface-loaded Cu particles (scCu-rGO) was prepared by supercritical CO 2 deposition, and Cu matrix composites with scCu-rGO as a reinforcement (scCu-rGO/Cu composites) were successfully prepared by ball milling for different times and spark plasma sintering (SPS). The scCu-rGO/Cu composites prepared with a ball milling time of 20 h exhibited high electrical conductivity (96.3 % IACS), tensile strength (240 MPa), and elongation (37 %). The outstanding properties are mainly ascribed to the uniform distribution of rGO by the ball milling process and rGO promoted by loading Cu particles onto its surface through supercritical deposition, which led to an interfacial reaction between rGO and Cu, resulting in the formation of a Cu 2 O transition layer with a load-transferring effect that enhanced the mechanical properties of the composites. Based on the experimental results, the strength of scCu-rGO/Cu composites is mainly enhanced by synergistic strengthening through grain refinement, Orowan looping and load transfer strengthening. This study demonstrates that the use of supercritical deposition to construct Cu 2 O transition layers can result in a strength-plasticity and high electrical conductivity match in scCu-rGO/Cu composites. The findings presented here offer new insights for innovative design of Cu matrix composites for advanced engineering applications by using supercritical deposition.
研究领域:
材料科学
·
复合材料工程
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2018
·
IF 11.698
Zhenying Jiang,Lingzhi Wang,Juying Lei,Yongdi Liu,Jinlong Zhang
The application of photo-Fenton process is restricted by the acidic pH and additional hydrogen peroxide (H 2 O 2 ). In order to overcome these drawbacks, a photo-Fenton system of CdS/rGO/Fe 2+ which can perform at natural pH with in situ -generated H 2 O 2 has been successfully developed. Highly efficient photo-Fenton degradation of phenol was achieved under the visible light irradiation via the CdS/rGO/Fe 2+ system. Experimental results showed that phenol could be degraded completely in 1 h at natural pH. The plentiful in situ generation of H 2 O 2 was further proved to act as an important role in phenol degradation with the addition of Fe 2+ . The advantages of degradation at natural pH with in situ -generated H 2 O 2 can provide a new prospective to the environmental-friendly Fenton process.
研究领域:
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2017
·
IF 3.387
Xuejun Xu,Zhichun Si,Liping Liu,Zehao Wang,Ze Chen,Rui Ran,Yonghong He,Duan Weng
Noble metal free MoS 2 /g-C 3 N 4 catalyst has attracted intense attentions for visible light photocatalytic hydrogen evolution as a result of its earth abundance, low cost and unique heterojunctions stacked with two dimensional sheets. However, the low charge separation efficiency resulted from the poor conductivity of g-C 3 N 4 and MoS 2 , and lack of abundant active sites from coordinative unsaturated atoms in MoS 2 , restricts the photocatalytic hydrogen evolution activity and stability enhancement of MoS 2 /C 3 N 4 composite catalysts. Herein, CoMoS 2 /rGO/g-C 3 N 4 catalysts with ternary heterojunctions are prepared by facile solvothermal method, which exhibit high visible light photocatalytic activity and stability for hydrogen evolution. The optimal hydrogen evolution rate of CoMoS 2 /rGO/g-C 3 N 4 catalysts is 684 μmol g −1 h −1 when the content of CoMoS 2 is 2% and the content of rGO is 0.5%. The stability of CoMoS 2 /rGO/C 3 N 4 catalysts just decrease about 3% after 4 cycling runs for 16 h. The good catalytic performances of catalysts are attributed to the synergistic effect among the g-C 3 N 4 nanosheets, rGO nanosheets and CoMoS 2 nanosheets. The high conductivity of rGO nanosheets enhances the electron-hole separation and charge transfer, and Co doping increases the active sites for hydrogen evolution due to the increase of unsaturated atoms in CoMoS 2 nanosheets.
研究领域:
材料科学
·
能源化学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Physical Chemistry C
·
2025
·
IF 3.2
Wei Zeng,Sili luo,Da Rong,Yanlong Li,Yunying Fei,Meng Zhao,Linsheng Huang
A highly sensitive electrochemical sensor based on a composite of two-dimensional (2D) reduced graphene oxide (rGO) and three-dimensional (3D) zeolitic imidazolate framework-8 (ZIF-8) for detecting the NH4+ ion is reported. The ZIF-8/rGO composite electrode is in situ grown to be anchored on the Si/Ag substrate. Here, the rGO layer has high conductivity, while ZIF-8 has a large specific surface area, which provides a large number of active sites. This structure significantly increases the electrical conductivity and enhances the electrochemical performance. With a differential pulse voltammetry measurement at the pH value of 7.00, the multidimensional composite electrode with the optimal ZIF-8 structure exhibits a sensitivity of 9.30 μA μM–1, and a detection range of 5–50 μM with a low detection limit of 3.00 × 10–9 M, as well as high repeatability, stability, and selectivity. These results might be due to the oxidation reaction of NH4+ with the ZIF-8 framework and the special 2D–3D electron transfer channel formed by the composite.
研究领域:
材料科学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Lizhe Ma,Jieli Duan,Bang Ji,Yunfeng Liu,Chengjie Li,Can Li,Wenfeng Zhao,Zhou Yang
Overuse of antibiotics threatens water security, and photocatalysis is a potential technology to alleviate this problem. In this study, the TiO 2 /Bi 2 WO 6 /rGO nanocomposite materials were prepared by a solvothermal process, and a series of characterizations were carefully examined. Then, the removal of norfloxacin from water under visible light irradiation was investigated to evaluate the photocatalytic activity of TiO 2 /Bi 2 WO 6 /rGO. The TiO 2 /Bi 2 WO 6 /rGO composite catalyst has higher photocatalytic activity than TiO 2 and TiO 2 /Bi 2 WO 6 under visible light, and the optimal addition content for rGO is 0.5%. After 60 min of visible light irradiation, the degradation rate of norfloxacin on TiO 2 /Bi 2 WO 6 /rGO-0.5% reached 87.79%. Furthermore, the UV–Vis of the complex suggests that the ligand-metal electron transfer mechanism enhances the catalytic activity of TiO 2 /Bi 2 WO 6 /rGO. Finally, the mechanism of photocatalytic degradation of norfloxacin by TiO 2 /Bi 2 WO 6 /rGO composite catalyst was proposed.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2020
·Vol. 31
·期 5
·1164-1171
·
IF 2.578
Mengmeng Song,Meng Zhou,Hengfeng Hu,Heqing Fu
First, attapulgite-Fe 3 O 4 magnetic filler (ATP-Fe 3 O 4 ) was prepared by using a chemical precipitation method. Subsequently, graphite oxide (GO) was prepared through Hummer method, and then reduced GO (RGO) was prepared through GO reduced by chitosan (CS). Finally, a series of WPU-RGO/ATP-Fe 3 O 4 /CS composites were prepared by introduced RGO/ATP-Fe 3 O 4 /CS to waterborne polyurethane. The structure and properties were characterized by scanning electron microscopy (SEM), Fourier transform infrared (FTIR), X-ray diffraction (XRD), vibrating sample magnetometry (VSM), thermogravimetric analysis TGA, conductivity test, and tensile test. The experimental results indicated that thermal stability and tensile strength of nanocomposites were improved with the increase of the content of RGO/ATP-Fe 3 O 4 /CS. Meanwhile, with the increase of the RGO/ATP-Fe 3 O 4 /CS content, the electrical and magnetic properties of WPU-RGO/ATP-Fe 3 O 4 /CS composites were improved. When the content of RGO/ATP-Fe 3 O 4 /CS was 8 wt%, the electrical conductivity and the saturation magnetic strength of WPU-RGO/ATP-Fe 3 O 4 /CS composites were 3.1 × 10 −7 S·cm −1 and 1.38 emu/g, respectively. WPU-RGO/ATP-Fe 3 O 4 /CS composites have excellent electrical and magnetic properties.
研究领域:
材料科学
·
纳米技术
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）