Journal of Energy Storage
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2023
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IF 9.4
T. Nandagopal,G. Balaji,S. Vadivel
The efficiency of a supercapacitor depends heavily on the materials used to create its electrodes. Physicochemical properties have piqued interest in using transition metal molybdates as electrode materials in supercapacitors . Monodisperse CoMoO 4 nanorods with a modest dimension (about 40–60 nm in width and 1.5–2 μm in length) were created on reduced graphene oxide (rGO) nanosheets were synthesized via a facile hydrothermal method . Hybrid CoMoO 4 @rGO electrodes have shown exceptional electrochemical properties, especially when compared to pure CoMoO 4 in an alkaline electrolyte . In particular, the maximum specific capacitance of CoMoO 4 @rGO is 1425 Fg −1 at a current density of 1Ag −1 , while the greatest specific capacitance of CoMoO 4 is 751 Fg −1 at the same current density. Both the pure and hybrid electrodes show excellent rate capability and long-term cyclic stability, even at high current densities of 20 Ag −1 . Also, at a current density of 20 Ag −1 , the constructed asymmetric supercapacitor generated a maximum power density of 4.5 kWkg −1 , and at a current density of 1 Ag −1 , it generated a high energy density of 51.2 Whkg −1 . Based on their promising electrochemical performance, the hierarchical CoMoO 4 @rGO nanocomposites were discovered to provide for a promising electrode material in the creation of highly effective supercapacitors for power storage.
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International Journal of Electrochemical Science
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2023
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IF 1.5
Qishi Zhong,Zhiyong Zhao,Zhihua Liu,Yujun Qin
The exploration of graphene-based electrochemical sensors has aroused intensive interest in application research. Here, we report the decoration of a reduced graphene oxide hydrogel film with Cu 2 O through a facile electrodeposition method and show that the as-prepared Cu 2 O/graphene hydrogel film can be directly utilized as an electrochemical H 2 O 2 sensor. The morphology and structure of the hydrogel composite are characterized, and the optimal electrodeposition time is determined. The graphene/Cu 2 O hydrogel film acting as a H 2 O 2 sensor exhibits high electrochemical sensing properties in terms of response, detection limit and selectivity. The present study could expand the potential of graphene hydrogel materials in the fields of sensors and biosensors.
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International Journal of Electrochemical Science
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2023
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IF 1.5
Alif Daffa Setyoputra,Heydar Ruffa,Heri Sutanto,Agus Subagio
Increasing energy demands are triggering the development of high performance, low-cost supercapacitor electrode material, particularly in countries that are shifting to renewable energy as their current energy supply cannot meet their significant energy demands. These countries require high-voltage, safe and long-lasting electrical energy storage devices. Multi-walled carbon nanotubes (MWCNTs), reduced graphene oxide (rGO) and Titanium Dioxide (TiO 2 ) were tested during an in-situ hydrothermal process. The structure test of X-ray diffraction (XRD) and scanning electron microscope (SEM) characterisation was used to determine the relation between the morphology of the electrode and its electrochemical value. The morphology of the composite electrode indicated that the nanocomposite electrode had better values than the single material electrode. Additionally, cyclic voltammetry (CV) and electrochemical impedance spectrum (EIS) tested in a two-electrode system indicated that the specific capacitance of MWCNT-rGO-TiO 2 30% was 168 F g −1 and showed the energy and power density to be 15 Wh kg −1 and 337.5 W kg −1 , respectively. This result was higher with the other electrode due to the faradaic and non-faradaic processes in the electrode.
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APPLIED SURFACE SCIENCE
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2023
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IF 6.7
Yuan Shu,Tingkai Zhao,Yatao Li,Lei Yang,Xianghong Li,Guyue Feng,Weiyu Jia,Fa Luo
Electromagnetic wave absorbers composed of reduced graphene oxide (RGO) and magnetic nanoparticles integrates dielectric and magnetic loss features, which is extremely desirable for enhancing electromagnetic wave absorption ability. Here, porous Fe/FeO/Fe 2 O 3 nanorods/RGO composites (FFORGO) are synthesized via anchoring FeO(OH) nanorods on graphene oxide (GO) through dopamine polymerization followed by thermal reduction treatment. The porous Fe/FeO/Fe 2 O 3 nanorods are anchored on RGO, and crosslinked structure formed in FFORGO composites when the GO addition is higher than 5 mg‧ml −1 . The abundant active sites (e.g., functional groups, dangling bonds, and lattice defects), the numerous heterointerfaces (among Fe, FeO, Fe 2 O 3 and RGO) and crosslinked structure trigger multiple dipole polarization, interface polarization and enhanced conductive loss. The EM wave absorption property is optimized by tuning the GO addition. FORGO4 with filler loading of 30 wt% achieves the maximal reflection loss of −24.1 dB at a thickness of 1.9 mm and the effective bandwidth below −10 dB of 3.01 GHz with a thickness of 2.2 mm, owing to the proper ratio of Fe/FeO/Fe 2 O 3 nanorods/RGO and synergistic effect between dielectric loss (dipole polarization, interface polarization, conductive loss) and magnetic loss (eddy current loss and exchange resonance). With the filler loading of 35 wt%, the maximal reflection loss of FFORGO4 is −50.7 dB at a thickness of 1.7 mm and the effective bandwidth reaches to 3.74 GHz at a thickness of 1.8 mm.
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高影响因子
DIAMOND AND RELATED MATERIALS
·
2023
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IF 4.1
Shang Wu,Xin Xu,Xin Sun,Sheng Zhou,Chaoyang Liu,Penghui Zhang,Shuaishuai Fu,Hong Zhang,Shaofeng Pang,Xia Wang,Quanlu Yang
Metal organic framework (MOF) as an electrode material is still a great challenge due to inherent instability and poor electrical conductivity . Herein, we design a material rGO/NiCo 2 S 4 , which by using GO and metal organic framework (ZIF-67) as the template and precursor. Additionally, the presence of GO and ZIF-67 can increase specific surface area and provide active sites for redox reactions and shortens ion transport pathways. The synthesized of rGO-10/NiCo 2 S 4 has excellent electrochemical properties as electrode material, which has a high specific capacity of 171 mAh g −1 and 121.9 mAh g −1 (1 A g −1 and 10 A g −1 ). The as-obtained rGO-10/NiCo 2 S 4 //AC asymmetric supercapacitor (ASC) of power density is 870 W kg −1 when the specific energy 41 Wh kg −1 , and with 88.2 % capacitance retention after 5000 cycles at 5 A g −1 . Therefore, the rGO-10/NiCo 2 S 4 derived from ZIF-67 as electrode materials for high-performance asymmetric supercapacitors has a good prospect.
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Biomedical Physics & Engineering Express
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2019
·Vol. 5
·期 2
·025002
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IF 0
Orwa Shueibi,Ziyan Zhou,Xianliu Wang,Bingcheng Yi,Xing He,Yanzhong Zhang
Graphene oxide (GO) and reduced graphene oxide (rGO) are two of the most representative graphene derivatives that can be employed to engineer bioactive and/or electroactive scaffolds for neural tissue engineering (NTE). However, a comparison with regard to their chemical structural impact on cytocompatibility has yet to be performed. In this study, GO was prepared using a modified Hummers' method followed by thermal treatment to obtain the rGO. Thereafter, a stable jet electrospinning approach was used to electrospin a viscous mixed solution of polycaprolactone (PCL)/poly(ethylene oxide) (PEO) (mass ratio 4:1) containing a tiny amount of GO and rGO (1% w/w), for the generation of highly-aligned nanoscale fibers of PCL-PEO-GO and PCL-PEO-rGO, respectively. Structural characteristics and physicochemical properties of the GO and/or rGO incorporated PCL-PEO nanofibers were characterized by various analytical techniques including Raman, FTIR, SEM, water drop contact angle, cyclic voltammetry and tensile testing. Finally, biological study in vitro by culturing the fibrous scaffolds with murine Schwann cells for cytocompatibility evaluation demonstrated that comparatively PCL-PEO-GO scaffold could more favorably promote the proliferation of the Schwann cells. However, considering the noted higher electroconductivity, the fibrous PCL-PEO-rGO may be applied to induce stem cell differentiation towards neural lineage. This research could provide a guidance for judicious selection of the GO and rGO incorporated nanofibers to construct electroactive scaffolds for engineering functional neural tissues.
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ACS Omega
·
2019
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IF 2.584
Ruijie Yang,Kelin Song,Jiansheng He,Yingying Fan,Rongshu Zhu
In this work, the study of photocatalytic hydrogen production by RGO/ZnIn2S4 with simultaneous degradation of organic amines was carried out in the presence of organic amines in wastewater as the sacrificial agents. The effects of several factors, such as organic amine types, pH value, catalyst concentration, organic amine concentration, and sunlight source, on the photocatalytic activity of RGO/ZnIn2S4 for H2 production were investigated. At the same time, its performance of degrading organic amines during H2 production was also examined. The results showed that the order of H2 production activity of RGO/ZnIn2S4 in six organic amine solutions was N(CH2CH3)3 > N(HOCH2CH2)3 > N(CH3)3 > HO(CH2)2NH2 > C6H5–N2> CO(NH2)2, and the highest H2 production was in N(CH2CH3)3 (triethylamine) solution, being 1597 μmol·g–1·h–1, which is 2.6 times as high as that using the aqueous solution mixture of Na2S and Na2SO3 as the sacrificial agent. In addition, when the pH was 13, the catalyst concentration was 1.0 g·L–1, and the triethylamine concentration was 1.0 mol·L–1, the photocatalytic activity was the highest. Furthermore, the relationship between triethylamine concentration and H2 production was analyzed according to the theory of dynamics.
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PubMed
高影响因子
CATALYSIS LETTERS
·
2019
·Vol. 149
·期 5
·1197-1210
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IF 2.372
Wang Lina,Guo Tong,Sun Sen,Wang Yan,Chen Xiaoling,Zhang Kangning,Zhang Dongxia,Xue Zhonghua,Zhou Xibin
Abstract The electrocatalytic activity of transition metal dichalcogenides (TMDs) is largely dependent on the exposed massive active sites and electrical conductivity of the catalysts. In this work, a tree-like nanocomposite (NiS 2 /MoS 2 -RGO) which is composed of bimetal sulfide (NiS 2 /MoS 2 ) nanocomposites uniformly anchored on the surface of reduced graphene oxide (RGO) was successfully synthesized. As a catalytic material for the hydrogen evolution reaction (HER), the NiS 2 /MoS 2 -RGO composites exhibit significantly enhanced electrocatalytic activity and impressive long-term stability for the hydrogen evolution reaction over a wide pH range. The tree-like NiS 2 /MoS 2 -RGO nanocomposites afford a current density (η 10 ) of 10 mA/cm 2 at small overpotentials of 172, 144 and 229 mV, and have a small Tafel slope of 51, 82 and 103 mV/dec in acidic, alkaline and neutral solution, respectively. Further studies reveal that the effective activities benefit from the abundant active edge sites and defects of NiS 2 /MoS 2 nanocomposites and the excellent conductivity of RGO. Graphical Abstract
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高影响因子
Catalysts
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2019
·Vol. 9
·期 2
·187
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IF 3.444
Pingfan Xu,Siyi Huang,Minghua Liu,Yuancai Lv,Zhonghui Wang,Jinlin Long,Wei Zhang,Haojun Fan
Semiconductor photocatalysis has received much attention as a promising technique to solve energy crisis and environmental pollution. This work demonstrated the rational design of “sandwich” WO3/rGO/SnIn4S8(WGS) Z-scheme photocatalysts for efficient purification of wastewater emitted from tannery and dyeing industries. Such materials were prepared by a combined protocol of the in situ precipitation method with hydrothermal synthesis, and structurally characterized by XRD, SEM, HRTEM, UV-vis DRS, and PL spectroscopy. Results showed that the Z-schemed nanohybrids significantly enhanced the photocatalytic activity compared to the single component photocatalysts. An optimized case of the WGS-2.5% photocatalysts exhibited the highest Cr(VI) reduction rate, which was ca. 1.8 and 12 times more than those of pure SnIn4S8(SIS) and WO3, respectively. Moreover, the molecular mechanism of the enhanced photocatalysis was clearly revealed by the radical-trapping control experiments and electron paramagnetic resonance (ESR) spectroscopy. The amount of superoxide and hydroxyl radicals as the major reactive oxygen species performing the redox catalysis was enhanced significantly on the Z-scheme WGS photocatalysts, where the spatial separation of photoinduced electron–hole pairs was therefore accelerated for the reduction of Cr(VI) and degradation of Rhodamine B (RhB). This study provides a novel strategy for the synthesis of all-solid-state Z-scheme photocatalysts for environmental remediation.Keywords:WO3/rGO/SnIn4S8;Z-scheme photocatalyst;active oxygen species;photocatalytic Cr (VI) reduction;rGO
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高影响因子
PROGRESS IN ORGANIC COATINGS
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2019
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IF 3.42
Haowei Huang,Xiaofeng Huang,Yuhui Xie,Yuqin Tian,Xiang Jiang,Xinya Zhang
Inspired by mussels’ universal adhesive ability to various substrates, polydopamine (PDA) was used to bind graphene oxide (GO) and hexagonal boron nitride (h-BN) together to fabricate h-BN-rGO@PDA nanohybrids. The as-prepared h-BN-rGO@PDA nanohybrids were served as anticorrosive nanofillers for polyvinylbutyral (PVB) coatings on mild steel. The structure of h-BN-rGO@PDA nanohybrids were characterized by SEM, XRD, FT-IR, UV–vis and Raman spectroscopies. Electrochemical corrosion tests were conducted to examine the anticorrosion properties of h-BN-rGO@PDA/PVB composite coatings. The results show that the stacked h-BN nanosheets are exfoliated by GO. And PDA is successfully grafted onto the surface of h-BN-rGO@PDA and simultaneously reduced GO into rGO. The h-BN-rGO@PDA nanohybrids are homogeneously distributed in the PVB matrix. When the mass ratio of GO to h-BN in h-BN-rGO@PDA is 1:1, the as-prepared h-BN-rGO@PDA possesses effective aspect ratio and thus its PVB composite coating obtains the optimal anticorrosion performance with 2 orders of magnitude higher than pure PVB.
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高影响因子
ELECTROCHIMICA ACTA
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2019
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IF 5.383
Cheng Cheng,Jiangtao Xu,Wei Gao,Shouxiang Jiang,Ronghui Guo
Metal-organic frameworks (MOFs) show promise and potential in energy storage but have limited applications due to their poor conductivity. In this work, a flexible fabric electrode is constructed with a sphere-flake-sphere structure formed by a nick-metal-framework (Ni-MOF) and reduced graphene oxide (RGO). The sphere-flake-sphere structure improves the conductivity and enhances the electrochemical performance of flexible RGO/Ni-MOF/metallic fabric electrodes (RNMEs). The areal capacitance of the RNME samples can reach 260 mF/cm 2 at a current density of 4 mA/cm 2 . The areal capacitance of RNME samples shows a good cycle stability after undergoing 2000 charging/discharging cycles. The all-solid-state asymmetric fabric supercapacitor (AAFSC) based on this hybrid and PPy fabric electrode shows excellent electrochemical energy-storage performance, with an areal capacitance of 95 mF/cm 2 , a power density of 3.07 mW/cm 2 , and an energy density of 7.72 μWh/cm 2 . The areal capacitance of AAFSC can keep over 70% of original areal capacitance after 1500 charging/discharging cycles. This flexible AAFSC shows a promise and potential for wearable textile electronics.
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SUPERLATTICES AND MICROSTRUCTURES
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2018
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IF 2.099
Ni Sun,Jing Ma,Chao Wang,Juanqin Xue,Liangsheng Qiang,Jieli Tang
A facile and efficient one-step hydrothermal method was performed to prepare the TiO 2 /reduced graphene oxide (TiO 2 /rGO). The obtained materials were characterized by X-ray diffraction (XRD), Raman spectra , transmission electron microscopy (TEM), X-ray photoelectron spectra (XPS) and UV–vis diffuse reflectance spectra. The results showed that the well dispersed TiO 2 nanoparticles with anatase were found uniformly distributed throughout the surface of rGO sheets. The as-prepared composite was used to photocatalytic degradation of Methylene blue (MB), and the experiment results show that TiO 2 /rGO exhibited an enhanced photocatalytic activity for MB degradation under visible-light irradiation compared to Degussa P25, which was attributed to extended light absorption and increased charge separation efficiency due to excellent electrical properties of GO and the chemical bond between rGO and TiO 2 nanoparticles. The composite maintained a higher level of activity after five recycles without any significant loss of photo-catalytic activity. The results manifested that the facile synthesis via a one-pot hydrothermal treatment can provide an effective approach to enhance the performance of TiO 2 /rGO, which is a promising candidate in wastewater treatment application.
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