JOURNAL OF THE AMERICAN CERAMIC SOCIETY
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2021
·Vol. 104
·期 12
·6696-6708
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IF 3.784
Huaiyang Chen,Xiaoping Shen,Keqiang Xu,Yao Chen,Aihua Yuan,Zhenyuan Ji,Zhitao Wang,Guoxing Zhu
Binary transition-metal oxides with spinel structure have great potential as advanced anode materials for lithium-ion batteries (LIBs). Herein, NiFe-NiFe 2 O 4 / reduced graphene oxide (rGO) composites are obtained via a facile cyanometallic framework precursor strategy to improve the lithium storage performance of NiFe 2 O 4 . In the composites, NiFe-NiFe 2 O 4 nanoparticles with adjustable mass ratios of NiFe 2 O 4 to NiFe alloy are homogeneously deposited on rGO sheets. As anode material for LIBs, the optimized NiFe-NiFe 2 O 4 /rGO composite displays remarkably enhanced lithium storage performance with an initial specific capacity as high as 1362 mAh g −1 at 0.1 A g −1 and a decent capacity retention of ca . 80% after 130 cycles. Besides, the composite delivers a reversible capacity of 550 mAh g −1 at 1 A g −1 after 300 cycles. During the charge–discharge cycles, the aggregation of the NiFe-NiFe 2 O 4 nanoparticles and the structural collapse of the electrode can be well alleviated by rGO sheets. Moreover, the conductivity of the electrode can be significantly improved by the well-conductive NiFe alloy and rGO sheets. All these contribute to the improved lithium storage performance of NiFe-NiFe 2 O 4 /rGO composites.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2021
·Vol. 32
·期 14
·19179-19190
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IF 2.478
Li Yuting,Yan Luting,Zhang Lu,Song Xiaodong,Dai Chunai
An electrochromic supercapacitor is a new type of multifunctional device. It can store energy, change its optical properties, and its color can intuitively reflect the energy storage of the device in real time. This study focused on W 18 O 49 nanowires (WNS) and polyaniline (PANI) electrochromic materials and their thin-film electrodes. Graphene oxide was incorporated in the process of solvothermal preparation of WNS and graphene/W 18 O 49 nanowires composite (rGO–WNS) was obtained. Compared with WNS, the electron transport capability of rGO–WNS is improved, which effectively reduce the discoloration time from 7 to 4 s and the coloring time from 10 to 2 s. In addition, the coloration efficiency has also improved from 45.37 to 52.72 cm −2 ·C −1 , however, the optical modulation amplitude of the composite is reduced from 35 to 20% due to the obstruction of graphene to the transmittance. A characteristic pseudocapacitive behavior is observed for rGO–WNS and PANI electrodes, which were assembled in pairs to form an EC supercapacitor (ECSC) device. With the voltage increased from − 0.2 to 1.4 V, the color of ECSC varies among light green, dark green, light blue and dark blue.
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ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Zhi-Guo Wang,Jia-Cheng Lv,Zi-Li Zheng,Ji-Guang Du,Kun Dai,Jun Lei,Ling Xu,Jia-Zhuang Xu,Zhong-Ming Li
Innovations of transistors toward miniaturization and integration aggravate heat accumulation of central processing units (CPUs). Thermal interface materials (TIMs) are critical to remove the generated heat and to guarantee the device reliability. Herein, maltose-assisted mechanochemical exfoliation was proposed to prepare maltose-g-graphene as a structural motif of TIMs. Then, maltose-g-graphene/gelatin composite films with a bilayer structure were prepared by two-step vacuum filtration to construct effective thermally conductive pathways consisting of the directionally arranged and tightly packed maltose-g-graphene. The bilayer composite film exhibited a remarkable in-plane thermal conductivity (30.8 W m–1 K–1) and strong anisotropic ratio (∼8325%) at 40 wt % maltose-g-graphene addition. More intriguingly, the cooling effect on CPUs was significantly better for the bilayer composite films than commercial thermal pads as TIMs. The outstanding thermally conductive stability in resistance to instantaneous and prolonged thermal shocks as well as fatigue stability was gathered. Our work offers a valuable reference to design and fabricate high-performance TIMs for CPU cooling to surmount harsh application scenarios.
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高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2021
·
IF 4.464
Chao Yang,Jun Yang,Chunliu Liang,Limin Zang,Zijie Zhao,Hongjie Li,Lijie Bai
Realization of flexible supercapacitors with tunable capacitance, high mechanical performance, and superior electrochemical performance has been achieved by precisely controlling the volume of vacuum filtration of reduced graphene oxide/tannin (RGO/TA) mixture slurry in this study. The TA coating on the surface of RGO can not only prevent RGO sheets from aggregation, but also provide extra pseudocapacitance and facilitate the reduction of graphene oxide at the same time owing to the abundant redox-active groups of TA. The capacitance of the RGO/TA film electrode can be continuously adjusted in the range of 40.69 to 234.13 mF cm −2 . The flexible all-solid-state supercapacitor (FASC) based on RGO/TA film electrode exhibits a good capacitance of 40.37 mF cm −2 , superior cycling stability, and good energy density of 3.60 μ W h cm −2 at a power density of 107.6 μ W cm −2 . Due to the 3D network structure of the RGO/TA film electrode and good mechanical properties of the substrate (nylon filter membrane), the FASC also shows acceptable performance at various bending states, which is conducive to expand its application in wearable and portable electronics. Besides, this simple and reliable method can be also applied to fabricate other supercapacitors/electrodes with desired shapes and capacitance, which can more effectively meet the practical needs.
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APPLIED SURFACE SCIENCE
·
2021
·
IF 6.707
Jiamin Zeng,Ning Fu,Xiaodong Wang,An'an Zhou,Zhenglong Yang
Ultrahigh specific capacity silicon is considered as a potential anode candidate for lithium-ion batteries (LIBs). In order to reduce the influence of the large volume expansion and poor conductivity of silicon, a few silicon nanoparticles are now used in commercial anodes, which increases costs and weakens the overall specific capacity. Here, we used low-cost aluminum–silicon alloys as raw materials to obtain porous silicon (pSi) particles by simple chemical etching. Then, Ag doped porous silicon/graphite (Ag-pSi/G) composite was prepared by depositing ultrafine Ag nanoparticles and mixing low-quality graphite. The large specific surface area, Ag nanoparticles and graphite provide multiple electron transport pathways in Ag-pSi/G, so they greatly increase the conductivity of the Ag-pSi/G and effectively reduce its volume expansion. The Ag-pSi/G composite shows high initial charging capacity (3313 mAh g −1 at 0.1 A g −1 ) and initial coulombic efficiency (82.2%), and stable reversible specific capacity of 770 mAh g −1 over 300 cycles at 1 A g −1 . This simple and scalable preparation process provides a new thought for the broad application of micron silicon materials in the high-performance LIBs.
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Surfaces and Interfaces
·
2021
·
IF 4.837
Tao Wang,Li-Chao Jing,Zelong Bao,Pengfei Qian,Wenming Geng,Anita Sagadevan Ethiraj,Wen-Hao Geng,Lvyun Chen,Qingxia Zhu,Hong-Zhang Geng
Carbon nanotubes (CNTs) and graphene (Gr) are promising materials for flexible transparent conductive films (TCFs) in optoelectronic application because of their exceptional electrical, optical, and mechanical properties . Here, high-quality graphene nanosheets were synthesized by the one-step green method which using natural polyphenols-gallic acid (GA) as the exfoliation medium through high-pressure homogenization ; besides, GA molecules can also be used as a non-covalent modifier to obtain GA modified CNTs (GCNTs). Then, the Au decorated Gr/GCNT-PET (Au-Gr/GCNT-PET) TCFs were obtained by a simple spray-coating process. The TCFs exhibited an excellent optoelectronic performance ( Rs = 45.6 Ω/sq., T = ca. 80% at 550 nm), relatively flat surface (roughness = 12.43 nm), good bending resistance (the ΔR Au-Gr/GCNT-PET TCF /R 0 was 0.07 after 1000 times bending tests) and strong adhesion (the f T of all Au-Gr/GCNT PET films was higher than 0.8). Finally, the Au-Gr/GCNT-PET films were used as an anode to prepare flexible green-light OLED devices; the maximum luminance of the Au-Gr/GCNT-PET device was 6554.1 cd/m 2 at 15V, and the maximum current efficiency was 4.03 cd/A. It confirmed that this type of TCFs has considerable potential application in photovoltaic devices .
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Polymers
·
2021
·Vol. 13
·期 10
·1657
·
IF 4.329
Yong Tian,Zhenxiao Bi,Gan Cui
In order to improve the corrosion resistance of zinc-rich epoxy coatings and reduce the amount of zinc used, first, graphene oxide (GO) was modified by sulfonated multiwall carbon nanotubes (SMWCNTs) to obtain the modified graphene oxide (SM-GO). The samples were characterized by Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD) and Raman spectroscopy. Then, four kinds of coatings were prepared, namely pure zinc-rich coating (0-ZRC), graphene oxide-based zinc-rich coating (GO-ZRC), sulfonated multiwall carbon nanotube-based zinc-rich coating (SM-ZRC) and SM-GO-based zinc-rich coating (SG-ZRC). The corrosion resistance of the above coatings was studied by open circuit potential (OCP), electrochemical impedance spectroscopy (EIS), a salt spray test, 3D confocal microscope, and electron scanning electron microscope (SEM). The results indicate that GO is successfully non-covalently modified by SMWCNTs, of which the interlayer spacing increases and dispersion is improved. The order of the corrosion resistance is GO-ZRC > SG-ZRC > SM-ZRC > 0-ZRC. The addition of GO, SMWCNTs, and SM-GO increases the shielding effect and increases the electrical connection between Zn particles and metal substrates, which improves the corrosion resistance. However, SMWCNTs and SM-GO also strengthen the galvanic corrosion, which decreases the corrosion resistance to some extent.Keywords:sulfonated;multiwall carbon nanotubes;graphene oxide;epoxy zinc-rich coating;corrosion resistance
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高影响因子
Journal of Materials Chemistry A
·
2021
·Vol. 9
·期 21
·12853-12869
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IF 12.732
Tahereh Sadeghian Renani,Seyyed Mehdi Khoshfetrat,Jalal Arjomandi,Hu Shi,Sadegh Khazalpour
Great efforts have been made to design and fabricate low-cost, high efficiency advanced electrode materials for energy storage devices such as batteries and high-performance supercapacitors. Choosing organic and redox active species that increase the faradaic charge storage of electrode systems has thus become a challenge to increase energy density and conductivity. To this aim, herein, azure A/3D graphene aerogel (Az–GA), and trypan (Try) blue–nickel metal–organic framework (Try–Ni-MOF) nanosheet array redox active electrodes are fabricated via a hydrothermal method and used in an asymmetric supercapattery. Az links to 3D GA via π–π interactions to form an anode. A nickel chloride hexahydrate array combines with Try as a MOF to form a cathode. These redox active materials increase the faradaic charge storage of the system. The as-prepared asymmetric device shows a high specific capacitance of 319 F g−1 at 1 A g−1, a specific energy of 66.55 W h kg−1, a specific power of up to 4.45 kW kg−1, and a higher capacity retention of 92.12% after 5000 charge–discharge cycles at 10 A g−1. This device exhibits a broad potential window of 1.60 V and represents a promising strategy toward safe and sustainable energy storage devices.
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NEW JOURNAL OF CHEMISTRY
·
2021
·Vol. 45
·期 24
·10850-10856
·
IF 3.591
Xiaoyan Chen,Lin Song,Guanyang Zhu,Jing Ma,Ajing Xu,Wenya Zhao,Yingying Gu,Yarui An,Yuqing Miao
In this work, a unique zirconium dioxide solid superacid (ZrO2/SO42−) was utilized for the fabrication of an IgG electrochemical immunosensor. The treated ZrO2 formed a SO bond on the surface, which has the electron-attracting induction effect and can further enhance the quantity and stability of immobilized biomolecules. In addition, using a platinum nanoparticle–chitosan–reduced graphene oxide (PtNP–CHIT–rGO) nanocomposite as a substrate modification material not only improves the conductivity of the electrode, but also increases the effective surface area of the immunosensing platform. The proposed label-free immunosensor has a lower detection limit of 11.0 pg mL−1 and a wide linear range of 0.01–10.0 ng mL−1 and 10.0–4000.0 ng mL−1. Importantly, the immunosensor exhibits good selectivity, excellent stability and reproducibility, and is expected to be applied to the detection of other biomolecules.
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DIAMOND AND RELATED MATERIALS
·
2021
·
IF 3.315
Zhanfan Jin,Songfeng E,Zhirong Luo,Doudou Ning,Jizhen Huang,Qin Ma,Fengfeng Jia,Zhaoqing Lu
Recently, aramid nanofibers (ANF) have attracted much attention due to the outstanding mechanical, insulating, and high temperature resistance properties. However, the poor thermal conduction behaviors severely limit their application fields, especially under some harsh conditions. To overcome this issue, reduced graphene oxide (rGO) which has been proven to have high thermal conductivity was used as an additive to improve the thermal conduction ability of ANF films in this work. The results show that the thermal conductivity of rGO/ANF composite is higher than those of pure ANF and GO/ANF films, which also increases with the increased rGO content. The 40% rGO can enhance the thermal conductivity of ANF by 1250%.
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Journal of CO2 Utilization
·
2021
·
IF 7.132
Jun Zhang,Shuai Shao,Desen Zhou,Quanlong Xu,Tielin Wang
Photocatalytic CO 2 reduction is considered as a potential route to solve the increasing energy crisis and greenhouse effect. However, CO 2 activation is still a big challenge because of the formidable electron transfer to CO 2 . Herein, an effective strategy was developed to facilitate CO 2 activation and reduction by in situ growth of ZnO nanowire arrays (ZnO NWAs) on the electronic-rich surface of three-dimensional (3D) N-doped reduced graphene oxide (N-rGO). Thanks to the positive effects of 3D N-rGO, ZnO/N-rGO exhibits a significantly enhanced photocatalytic CO 2 reduction to CH 3 OH performance (CH 3 OH-production rate of 1.51 μmol h −1 g -1 ), which was ca . 2.3 and 4.7 times higher than that of the pristine ZnO and commercial ZnO, respectively. It is found that 3D N-rGO can work as a trifunctional co-catalyst to support the uniform growth of ZnO NWAs, effectively improve the separation of electron-hole pairs and act as CO 2 adsorption and reduction active sites. This work exhibits a facile method to prepare 3D N-rGO-based composite materials, and also demonstrates that N-rGO is a promising multifunctional co-catalyst for photoreduction of CO 2 .
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PROGRESS IN ORGANIC COATINGS
·
2021
·
IF 5.161
Jie Zhang,Xiang Zhang,Yuying Zheng
Graphene (G) is an excellent protection material, but suffering corrosion-promotion effect because of its intrinsic high electrical-conductivity. Herein, a facile strategy is presented to effectively lower the conductivity of the G by the encapsulation of insulating poly(p-phenylenediamine) (PpPD). The obtained G@PpPD, which delivers an extremely low conductivity of 3.5×10 −7 S cm -1 , were then mixed with polyvinyl-butyral (PVB), forming a compact composite coating that can effectively protect Q235 steel from being corroded over a very long period. Such a superior anticorrosion property can be owing to the synergistic effect between impermeable graphene and insulated PpPD, which not only hinders the diffusion of the corrosive media, but also inhibits the corrosion-promotion activity of the graphene. This effective strategy may provide valuable enlightenment for the further development of graphene-based polymer anticorrosive coatings with long-lasting corrosion resistance .
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