DIAMOND AND RELATED MATERIALS
·
2023
·
IF 4.1
Shiqi Zhang,Peidong Ling,Yi Chen,Jun Liu,Chun Yang
Herein, 2D/2D porous Co 3 O 4 nanosheets/rGO composites modified GCE (Co 3 O 4 /rGO/GCE) were proposed for electrochemical detection of tryptophan (Trp). The surface morphology and structure of Co 3 O 4 /rGO nanosheets were carried out using SEM, XRD , and Raman spectra . Electrochemical performance of Trp on as-synthesized modified electrodes were discussed by CV and EIS techniques. Moreover, the best electrochemical property was also investigated by varying test condition detailedly. Consequently, oxidation peak intensity and current density were 130.3 μA and 336.7 μA·cm −2 on Co 3 O 4 /rGO/GCE at working potential of 0.78 V ( vs. SCE electrode), respectively. They were more than 23-times greater than these on bare GCE in electrochemical detection of Trp. It was attributed to the synergy effect of 2D porous Co 3 O 4 nanosheets (high catalytic activity) and 2D rGO nanosheets (large electrochemical active area). After the optimization, wide linear determination ranges (from 1.0 to 800 μM) and low LOD of 0.26 μM (S/N = 3) were acquired. In addition, these electrodes were further successfully applied to the determination of Trp in commercial amino acid injection samples. This 2D porous Co 3 O 4 /rGO modified GCE sensor could provide a slight view on the design of 2D/2D composite materials with high electrochemical properties.
研究领域:
生物医学工程
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2024
·Vol. 35
·期 19
·1-15
·
IF 2.8
Suguna A.,Parthibavarman M.,Sridevi C.,Al-Mohaimeed A. M.,Al-onazi W. A.
New ternary nanocomposites for photocatalysis, composed of ZnFe 2 O 4 @ZnO@rGO, were synthesised in this work using a straightforward hydrothermal method. After characterising the samples' structures, morphologies, and photoelectric outcomes, researchers found that 25–30 nm ZnFe 2 O 4 @ZnO nanoparticles were securely attached to the surface of the rGO sheets' fibres. The photocatalytic activity in the deterioration of rhodamine B (RhB) was much enhanced by the ZnFe 2 O 4 @ZnO@rGO composite photocatalysts when compared to ZnO, ZnFe 2 O 4 , and ZnFe 2 O 4 @ZnO. With a degradation efficiency of 99.9% for RhB and 88.7% for MB after 60 min of ultraviolet (UV) radiation, the ZnFe 2 O 4 @ZnO@rGO composite photocatalyst stood out as the most active photocatalyst. In addition, this nanocomposite exhibited excellent adaptability for use in water treatment, since it could be magnetised apart and maintained a dye removal percentage of about 100% after eight cycles. Analysis of the photodynamic response and TRPL spectra further verified that the manufactured ternary composite had improved charge transfer efficiency. The synergy of multicomponent ternary nanocomposites may have contributed to the enhanced performance by increasing absorption capacities automatically, discouraging the reconsolidation of electron–hole couples, and inducing the photodeveloped separation of proteins.
研究领域:
材料科学
·
环境科学
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产品关联
DOI
高影响因子
Canadian Journal of Chemistry
·
2020
·Vol. 98
·期 12
·
IF 1.171
Xin Chang,Xiangyang Xu,Zhifeng Gao,Yingrui Tao,Yixuan Yin,Guangyu He,Haiqun Chen
A nanocomposite, reduced graphene oxide (RGO) modified ZnCo2O4 (ZnCo2O4–RGO) was synthesized via one-step solvothermal method for activating persulfate (PS) to degrade bisphenol A (BPA). The morphology and structure of the nanocomposite were identified by X-ray diffraction, Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, scanning electron microscopy, and transmission electron microscopy. RGO provides nucleation sites for ZnCo2O4 to grow and inhibits the agglomeration of the nanoparticles. The influence of different reaction conditions on the oxidation of BPA catalyzed by ZnCo2O4–RGO was investigated, including the content of RGO, the dosage of catalyst, the concentration of humic acid (HA), anions in the environment, the reaction temperature, and pH. BPA can be totally degraded within 20 min under optimized reaction conditions. The presence of HA, Cl−, and NO3− only has a slight effect on the oxidation of BPA, whereas the presence of either H2PO4− or HCO3− can greatly inhibit the reaction. ZnCo2O4–RGO shows good cycling stability and practical application potential. A reaction mechanism of the degradation of BPA was also explored.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
MICROCHEMICAL JOURNAL
·
2022
·
IF 5.304
Mao Shen,Wei Li,Fengzao Chen,Lei Chen,Yuxiang Chen,Suqing Chen,Shibin Ren,Deman Han
Bisphenol A (BPA) is a potential endocrine-disrupting compound with adverse effects on both human health and the environment. Therefore, it is urgent to develop a convenient, sensitive and accurate method for BPA detection. In this paper, a ratiometric electrochemical sensor for BPA detection was developed using Ag@Fe 3 O 4 -rGO composite modified glassy carbon electrode (GCE), with the peak oxidation current of silver nanoparticles (NPs) in the material as the reference signal and the peak oxidation current of BPA as the indicator signal. The Ag@Fe 3 O 4 -rGO composite was prepared by a simple one-step solvothermal method. Due to the chemical functionality and two-dimensional structure, the rGO combined with Ag@Fe 3 O 4 core–shell NPs provides an excellent platform for BPA detection. The morphology, structure and electrochemical performance of Ag@Fe 3 O 4 -rGO composite were characterized by scanning electron microscope, transmission electron microscope, X-ray diffraction, X-ray photoelectron spectroscopy, Raman spectroscopy and electrochemical techniques. The proposed ratiometric electrochemical BPA sensor shows the linear detection range of 0.1–10.0 µM (R 2 = 0.997), with detection limit of 0.028 μM (S/N = 3), good selectivity, reproducibility and stability. In addition, this proposed ratiometric electrochemical sensor was successfully verified in the detection of BPA in real water samples.
研究领域:
环境科学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2018
·Vol. 8
·期 16
·8607-8614
·
IF 2.936
Lingxia Zheng,Lingtong Guan,Guang Yang,Sanming Chen,Huajun Zheng
CoFe2O4/reduced graphene oxide (CoFe2O4/rGO) hydrogel was synthesized in situ via a facile one-pot solvothermal approach. The three-dimensional (3D) network structure consists of well-dispersed CoFe2O4 nanoparticles on the surfaces of graphene sheets. As a binder-free electrode material for supercapacitors, the electrochemical properties of the CoFe2O4/rGO hybrid hydrogel can be easily adjusted by changing the concentration of the graphene oxide (GO) precursor solution. The results indicate that the hybrid material made using 3.5 mg mL−1 GO solution exhibits an outstanding specific capacitance of 356 F g−1 at 0.5 A g−1, 68% higher than the pure CoFe2O4 counterpart (111 F g−1 at 0.5 A g−1), owing to the large specific surface area and good electric conductivity. Additionally, an electrochemical energy storage device based on CoFe2O4/rGO and rGO was assembled, which exhibits a high energy density of 17.84 W h kg−1 at a power density of 650 W kg−1 and an excellent cycling stability with 87% capacitance retention at 5 A g−1 after 4000 cycles. This work takes one step further towards the development of 3D hybrid hydrogel supercapacitors and highlights their potential application in energy storage devices.
研究领域:
材料科学
·
能源存储与转换
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF POWER SOURCES
·
2016
·
IF 6.333
Bangrun Wang,Zhaoyin Wen,Jun Jin,Xiaoheng Hong,Sanpei Zhang,Kun Rui
Germanium is considered as a promising anode material for lithium ion batteries (LIBs) due to its high-capacity. However, owing to the huge volume variation during cycling, the batteries based on germanium anodes usually show poor cyclability and inferior rate capability. Herein, we demonstrated a novel strategy to uniformly anchor the core-shell structured germanium@carbon (Ge@C) on the reduced graphene oxide (rGO) nanosheets by the strong adhesion of dopamine. In the resulting Ge@C/rGO hybrid, the amorphous carbon layer and rGO nanosheets can effectively reduce the agglomeration of germanium and provide buffer matrix for the volume change in electrochemical lithium reactions. When used as anode materials for LIBs, Ge@C/rGO hybrids deliver a reversible capacity of 1074.4 mA h g −1 at 2C after 600 cycles (with capacity retention of 96.5%) and high rate capability of 436 mA h g −1 at 20C after 200 cycles. The encouraging electrochemical performance clearly demonstrates that Ge@C/rGO hybrids could be a potential anode material with high capacity, excellent rate capability, and good cycling stability for LIBs.
研究领域:
材料科学
·
能源存储技术
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2018
·Vol. 25
·期 31
·31358-31367
·
IF 2.8
Wan Zhong,Wang Jianlong
The advanced treatment of municipal secondary effluent by heterogeneous and homogeneous Fenton processes using Fe/Ce-RGO (reduced graphene oxide) and Fe 2+ as catalysts was studied and compared. Sulfamethazine (SMT) was spiked in the effluent to examine the effectiveness of the emerging contaminant removal. The Fe/Ce-RGO catalyst was characterized using a scanning electron microscope (SEM) and cycle voltammetry curves. The removal of dissolved organic carbon (DOC), soluble chemical oxygen demand (SCOD), SMT, and ultraviolet-visible spectroscopy in 254 nm (UV 254 ) of municipal secondary effluents was examined. The DOC removal efficiency of secondary effluent (without addition of SMT) was 36.30% and 11.74% using Fe/Ce-RGO and Fe 2+ as catalysts, respectively. The removal efficiency of DOC, SCOD, and SMT in heterogeneous Fenton process was higher than that in homogeneous Fenton process. The changes of three-dimensional excitation-emission matrix (3DEEM) fluorescence, soluble microbial products (SMPs), humic acids, and UV 254 were determined, and the results indicated that UV 254, aromatic proteins, and humic acids decreased rapidly in both processes; however, polysaccharides and protein-like substances were difficult to degrade. Although some toxic substances produced after Fenton-like treatment, the biodegradability of the treated effluent was enhanced.
研究领域:
环境科学
·
污水处理
·
催化材料
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Materials Chemistry A
·
2020
·Vol. 8
·期 9
·4807-4815
·
IF 11.301
Ying Gu,Aiping Wu,Lei Wang,Dongxu Wang,Haijing Yan,Peng Yu,Ying Xie,Chungui Tian,Fanfei Sun,Honggang Fu
Single-atom catalysts (SACs) have been promising in various catalytic fields, but the controllable synthesis of SACs with high stability remains challenging. Here, we show a robust strategy toward the fabrication of highly efficient and stable SACs based on the “competitive occupancy” of two metal (M) species on graphene oxide (GO). The abundant M1 (Ti) species predominantly occupy more groups of GO, thereby leaving a tiny number of groups in the gaps of the M1 species to combine with M2 (Co2+, etc.) species. Consequently, this guarantees the formation of Co–N4 SACs embedded in 2D TiN/rGO sheets during nitridation. Further, TiN can act as a “spacer” to prevent Co–N4 from aggregation, thereby improving catalyst stability. Co–N4/TiN–rGO exhibits outstanding catalytic performance for the fast conversion of highly concentrated aromatic nitro compounds (∼0.3–2 mM) into amino compounds and excellent recyclability, which is the best among reported catalysts. In contrast, TiN/rGO has no obvious activity, and Co4N–rGO prepared without Ti competition shows poor activity and stability, which indicates the vital role of Co–N4 and TiN for obtaining the remarkable catalytic ability of Co–N4/TiN–rGO. The reaction mechanism is also proposed based on theoretical calculations. The strategy can be used to design Ni (Fe, Cr, Cu)-based SACs.
研究领域:
材料科学
·
催化化学
✓ 已验证
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2021
·
IF 6.901
Hong Xiao,Tengfei Zhang,Xiao Liang,Qiuming Gao
HSN-rGO with high specific surface area and high content of N is prepared via GO reduction and N -doping of DMF, corrosion oxidation pore-forming of H 2 O 2 as well as further reduction and N -doping of N 2 H 4 •H 2 O under the solvothermal condition. The porous HSN-rGO has a high BET specific surface area of 464.3 m 2 g −1 . The N content in HSN-rGO is 5.27 at.%. The HSN-rGO shows a strong adsorption capability for the soluble lithium polysulfides (LiPSs) and more importantly it presents an excellent catalytic capability for the redox conversion of LiPSs. The HSN-rGO modified separator can inhibit the shuttle effect of LiPSs in Li-S battery. Besides, the HSN-rGO based separator has a good electrolyte wettability. The catalytic activity of HSN-rGO and Li + diffusion property in Li-S battery are well studied quantitatively. The Li-S battery with HSN-rGO-PP separator exhibits a high initial discharge capacity of 1372.8 mAh g −1 at 0.1 C and 681.5 mAh g −1 at 2 C, and a low-capacity decay rate of 0.055% per cycle for 1000 cycles at 1 C. This study proves the strategy that the HSN-rGO modified separator can effectively inhibit the shuttle effect of LiPSs and accelerate the redox reaction kinetics for high-performance Li-S battery.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2020
·
IF 4.65
Hongtao Zou,Shiliang Zhang,Xiaoling Hong,Qilu Yao,Yan Luo,Zhang-Hui Lu
As an ideal hydrogen supplier in liquid phase, hydrous hydrazine has gained a lot of attention for safe and efficient storage as well as transportation of hydrogen. Herein, a low Pt-containing Ni–Pt bimetallic catalyst immobilized on novel MIL-101/rGO composite has been prepared by a facile impregnation-reduction approach. Unexpectedly, the resultant Ni 0.9 Pt 0.1 /MIL-101/rGO catalyst exhibits optimal catalytic performance and 100% H 2 selectivity for hydrogen evolution from hydrous hydrazine under alkaline conditions at 323 K, giving a turnover frequency (TOF) value of 960.0 h −1 , which is a relatively higher value ever reported heterogeneous catalysts. Even at room temperature, Ni 0.9 Pt 0.1 /MIL-101/rGO catalyst shows excellent catalytic activity for dehydrogenation of hydrazine as well as hydrazine borane. In addition, the Ni 0.9 Pt 0.1 /MIL-101/rGO catalyst also exhibits excellent durability. Even after eight recycles, the catalytic activity is no significant decrease, and the H 2 selectivity still remains 100%.
研究领域:
材料科学
·
催化化学
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Chenyuan Zhao,Yuxiang Zhou,Tianyu Shi,Haihong Yin,Changqing Song,Lin Qin,Zhiliang Wang,Haibao Shao,Ke Yu
Although lithium sulfur batteries (LSBs) have high theoretical capacity and energy density , low conductivity of sulfur and the discharge species (Li 2 S 2 , Li 2 S), the polysulfide shuttle and the large volume change hinder the commercialization of LSBs. To tackle the problem, we hydrothermally prepared a special cocklebur-like ZnSe-VO 2 @rGO nanostructure , in which graphene oxide (GO) is active in inducing thorn-like VO 2 nanorods grown on carambola-like VO 2 nanostructures. In this structure, the polar VO 2 and ZnSe quantum dots (QDs) have strong chemical adsorption that can catalyze the polysulfide conversion and alleviate the shuttle effect; besides, the thorn-like VO 2 nanorods act like numerous tentacles that capture polysulfides by increasing the contact area, and the reduced graphene oxide (rGO) nanosheets not only buffer the volume change, but also enhance the conductivity of the framework and improve the ion and electron transfer . Boosted by the synergetic effects of VO 2 , rGO and ZnSe QDs, the ZnSe-VO 2 @rGO/S cathode achieves a high specific capacity of 1026.1 mA h g −1 at 0.2 C and 712.3 mA h g −1 at 2 C. Good cyclic stability was obtained as well, with a high reversible capacity of 820 mA h g −1 and high retention of 89.1 % after cycling at 0.5 C for 150 cycles. Such outstanding performance indicated its good potential for use in advanced LSBs.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
POLYMER COMPOSITES
·
2025
·
IF 4.7
Jiye Jia,Shijie Chen,Haifeng Tian,Dong Wang,Feng Yang,Pei Feng,Cijun Shuai
The low photogenerated charge carriers and quick complex annihilation of titanium dioxide (TiO 2 )/rGO composite leading to an unsatisfactory photocatalysis antibacterial effect limit its application in the bone scaffold. Herein, graphitic carbon nitride (g-C 3 N 4 ) was assembled with TiO 2 /rGO via a solvothermal method for enhancing the photocatalysis antibacterial properties of poly (lactic acid) (PLLA) bone scaffold prepared via selective laser sintering. The results revealed that g-C 3 N 4 expanded the light absorption range of TiO 2 /rGO from blue-violet light to visible light, resulting in the composites having a narrower band gap and producing more photoinduced charge carriers. More importantly, an S-scheme heterojunction was formed between g-C 3 N 4 and TiO 2 , which promoted the recombination of the electrons in the conduction band of TiO 2 and the holes in the valence band of g-C 3 N 4 . Meanwhile, rGO with excellent electrical conductivity reduced the interfacial charge transfer resistance and enhanced charge transfer efficiency, thus further avoiding the recombination rate of electrons and holes, whether TiO 2 or g-C 3 N 4 , and enhancing the photocatalytic properties. Consequently, the holes in the valence band of TiO 2 and the electrons in the conduction band of g-C 3 N 4 possessed high oxidation and reduction capacity, which oxidized H 2 O and reduced O 2 in the microenvironment, respectively, and generated lots of reactive oxygen species. In vitro antibacterial experiments indicated that the PLLA/TiO 2 /g-C 3 N 4 /rGO scaffold showed a better antibacterial effect, with the bacteriostasis rates of E. coli and S. aureus being 99.1% and 98.9%, respectively. In addition, cell adhesion and fluorescence results indicated that the scaffold had good biocompatibility and could provide a suitable microenvironment for the growth and proliferation of cells.
研究领域:
材料科学
·
生物医学工程
·
抗菌材料研究
✓ 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）