APPLIED SURFACE SCIENCE
·
2020
·
IF 6.182
Hongye Zhao,Xiangyang Xu,Yunfei Yao,Yina Li
Si/graphene composite has been considered as a promising structure to limit the volume expansion and improve poor conductivity of silicon anode. Herein, a novel method to prepare Si/reduced graphene oxide (Si/rGO) composite anode was proposed. With this approach, nickel shell was pre-coated on Si particles via electroless deposition before used as a template to in-situ reduce GO. During the reduction process, the nickel template can as well promote the self-assembly of graphene sheets on the surface of Si nanoparticles. Following these facile and convenient processes, a Si/rGO hybrid-structure can be directly fabricated. Compared with pure Si anode, this Si/rGO composite displays a greatly improved electrochemical performance in both cycling stability and rate capability. It delivers a reversible capacity as high as 975 mA h g −1 and 717 mA h g −1 after 300 cycles under the current densities of 1 A g −1 and 3 A g −1 , respectively. Meanwhile, its capacity can still maintain at 602 mA h g −1 even at a rather higher current of 5 A g −1 .
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ELECTROCHIMICA ACTA
·
2017
·
IF 4.798
Lingna Sun,Qingwei Deng,Yongliang Li,Hongwei Mi,Suhang Wang,Libo Deng,Xiangzhong Ren,Peixin Zhang
CoO-Co 3 O 4 heterostructure nanoribbons were successfully sandwiched between reduced graphene oxide (RGO) nanosheets through a facile solvothermal method and sintering process, which used directly as the anode material for lithium ion batteries. The as-prepared ultrathin CoO-Co 3 O 4 nanoribbon/RGO sandwich-like nanostructures (CoO-Co 3 O 4 -RGO) delivers a reversible capacity of 994 mAh g −1 at a current density of 100 mA g −1 after 200 cycles. Even at a high charge-discharge rate of 1000 mA g −1 , CoO-Co 3 O 4 -RGO still demonstrate a reversible capacity of 395 mAh g −1 after 500 cycles. The rate capability of CoO-Co 3 O 4 -RGO evaluated by the ratio of capacity at 100, 200, 500, 1000, 2000, 5000 and 100 mA g −1 after each 10 cycles was about 1210, 1060, 890, 730, 578, 392 and 915 mAh g −1 , respectively. The greatly enhanced performances for CoO-Co 3 O 4 -RGO may be ascribed to the synergistic effects: The multicomponent generates hybridizing advantages; The mutual influence of both CoO-Co 3 O 4 nanoribbons and RGO nanosheets decreases the aggregation; The two-dimensional (2D) nanoribbons with the short lithium ion diffusion and 2D RGO sheets as conductive network built an efficient three dimensional (3D) storage active material.
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JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
·
2020
·Vol. 20
·期 10
·6334-6343
·
IF 1.134
Xie Cong,Zhao Yubin,Song Yuxiang,Liu Yingjie,Wang Yaya,Yang. Ping,Gao Guanggang
On the basis of maintaining the original characteristics of each component, the composite material obtains the properties that the single component does not have through the synergy between the components. It is of great significance to understand the synergy between the components
for the development of the composite. First of all, we prepared different emitting CdTe quantum dots (QDs), and then fabricated CdTe QDs@reduced graphene oxide (rGO) composites by a simple ultrasonic method. It is found that the fluorescence of QDs quenched, the photocurrent significantly
improved, but the growth rate different from each other because of the different QDs. Afterwards, on the basis of naked QDs, hybrid SiO2-coated QDs were fabricated by a two-step method. After that, hybrid SiO2-coated CdTe QDs@rGO composites were prepared by the same method.
It is found that the existence of the hybrid SiO2 shell leads to the decrease of photocurrent of the composites before and after coating, but the specific capacitance significantly improved, and the cycle stability also better than the naked QDs. This research will make grapheme-based
composites have broad application prospects in energy storage equipment.
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高影响因子
RSC Advances
·
2018
·Vol. 8
·期 11
·5749-5759
·
IF 2.936
Pingfan Xu,Siyi Huang,Yuancai Lv,Yi Chen,Minghua Liu,Haojun Fan
To solve the problem of contamination of hexavalent chromium (Cr(VI)), visible-light-driven graphene-based ternary metal chalcogenide nanosheets (rGO/SnIn4S8) were synthesized via a one-pot surfactant-assisted hydrothermal method for the photoreduction of Cr(VI). Characterizations demonstrated that SnIn4S8 nanosheets were uniformly distributed on the surface of rGO and the as-synthesized nanosheets exhibited excellent photocatalytic activity under visible light. In addition, the effects of pH, concentration of critic acid, holes and electron scavengers on the reduction of Cr(VI) were systematically investigated. It was found that 50 mg L−1 of Cr(VI) could be completely removed within 30 min at pH 2 when citric acid served as a hole scavenger. Kinetic studies showed that the photocatalytic reduction of Cr(VI) processes obeyed the pseudo first order model. Further study indicated that the Cr(III) species was immediately adsorbed onto the surface of the rGO/SnIn4S8 nanosheets after photocatalytic reduction of Cr(VI). Additionally, recycling results suggested that rGO/SnIn4S8 nanosheets possessed high recycle ability and stability after repeated use (5 times). This effective and promising work might provide a new strategy for the photoreduction of Cr(VI) and complete removal of chromium from effluent through the novel photocatalyst rGO/SnIn4S8.
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APPLIED SURFACE SCIENCE
·
2021
·
IF 6.707
Zhouyu Tong,Yuxin Bi,Mingliang Ma,Zijian Liao,Weibo Huang,Kwok L. Chung,Yong Ma,Guanglei Wu,Yulong Qu,Chengbo Pan,Yusheng Wang
Novel composite microwave absorption (MA) materials with multiple loss mechanism have attracted considerable attention. In this work, flower-like surface Ni@Co 3 O 4 nanowires were designed and fabricated through chemical reduction method induced by magnetic field, followed by in-situ polymerization, low temperature oil bath and thermal annealing. Then, the Ni@Co 3 O 4 /RGO composites were prepared through a hydrothermal reaction of the Ni@Co 3 O 4 nanowires and graphene oxide suspension. The electromagnetic properties of different loading content samples (15 wt%, 25 wt% and 35 wt%) were measured to investigate the influence of loading content on the MA performance. For the 35 wt% loading sample, the minimum reflection loss (RL min ) value of −60.0 dB was determined at the thickness of 2.3 mm, and the maximum effective absorption bandwidth (EAB, RL < −10 dB) of 4.62 GHz can be achieved when the thickness is 1.6 mm. This research provides a reference for exploiting high-efficient flower-like surface magnetic-dielectric composites in the field of MA.
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CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Bowen Zhang,Lulu Guo,Jiayue Xin,Guangrui Xiang,Shengxuan Xu,Yu Gong,Xiaohan Sun,LeTian Zhao,Ke Wu,Fan Li,Zhimin Yang
The development of self-powered humidity sensors featuring rapid response, low hysteresis, and dual-mode signal output is highly anticipated in healthcare monitoring, wearable electronics and human-machine interaction. Here, we present a hydrogen bonding-mediated self-assembly strategy to synthesize α-Fe 2 O 3 -decorated reduced graphene oxide (Fe 2 O 3 -rGO) hybrids for high-performance dual-mode humidity sensing. In impedance mode, the sensor demonstrates a broad detection range (11–98 % RH), a response value of 71.1 at 98 % RH, fast response/recovery times (1 s/5 s), and minimal hysteresis (3.7 %). The sensing mechanism, elucidated through complex impedance spectroscopy and water adsorption isotherms, reveals synergistic proton transport and p-n heterojunction effects at the α-Fe 2 O 3 -rGO interface. Notably, the sensor also operates in a self-powered mode, generating an ultrahigh output voltage (1.1 V at 98 % RH) through humidity-triggered galvanic reactions, enabling capacitor charging and light-emitting diode (LED) driving. Practical applicability is demonstrated through real-time respiratory monitoring, Morse code communication, and non-contact finger motion tracking, underscoring its utility in wearable electronics. This work provides a scalable and cost-effective approach to designing multifunctional humidity sensors with broad applicability in smart systems and healthcare.
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产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
Xing Kang,Qinghua Liu,Zhihao Lu,Haonan Chen,Yingying Cai,Kun Gao,Yaning Liu,Gang Lu
Electrocatalytic hydrogen evolution reaction (HER) is a promising way to produce clean hydrogen energy. Although a variety of strategies have been developed to improve the performance of HER, it is still necessary to further develop cost-effective and efficient method for further improvement of HER performance. In this work, we proposed a novel method to further improve the HER performance of platinum (Pt) by adsorbing carefully chosen molecules on the composite of Pt and reduced graphene oxide (rGO). Typically, the molecules of methyl blue (MB) were selectively adsorbed on the surface of rGO sheets. The adsorption of MB molecules could promote interfacial charge transfer, leading to an improvement in electrocatalytic HER. After the adsorption of MB, the output current density at −0.6 V vs. RHE increased for 1.5 folds to −195 mA·cm −2 , and the overpotential at 10 mA·cm −2 decreased from −0.109 to −0.084 V vs. RHE. The improved charge transfer at interface was verified with many electrochemical measurements and theoretical calculations. Overall, this work proposes a simple and effective method to improve the electrocatalytic performance of HER, and this method could be easily and conveniently applied to many other catalytic systems.
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2018
·
IF 3.235
Lei Gao,Ruirui Yue,Jingkun Xu,Zhen Liu,Jingdang Chai
In this paper, Pt-PEDOT/reduced graphene oxide (Pt-PEDOT/rGO) nanocomposites were facilely prepared by a simple and cost-effective one-pot method. The obtained nanocomposites were characterized and confirmed by scanning electron microscopy, transmission electron microscopy, energy dispersive X-ray spectroscopy, X-ray diffraction, X-ray photoelectron spectroscopy and Raman spectra . As expected, the Pt-PEDOT/rGO nanocomposites modified glassy carbon electrode (Pt-PEDOT/rGO/GCE) exhibited higher charge transfer efficiency and electrocatalytic activity to the oxidation of caffeic acid (CA) in comparison with the bare GCE, rGO and Pt-PEDOT modified electrodes (rGO/GCE and Pt-PEDOT/GCE). Furthermore, the Pt-PEDOT/rGO/GCE showed a wide linear range of 5.0 × 10 −9 to 5.0 × 10 −5 M with a low detection limit of 2.0 × 10 −9 M (S/N = 3) for the determination of CA. More experiments indicated that the Pt-PEDOT/rGO/GCE performed superior reproducibility, selectivity and long-term stability. Finally, the modified electrode was also applied to detect CA in green tea and black tea samples with promising recovery and application prospect.
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高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Chenghong Sun,Enze Zhu,Chaoyang Shi,Juan Yu,Shubiao Yin,Chunxia Liu,Xiaoying Cui,Weiping Liu,Mingli Xu
The vigorous development of efficient cathode-side oxygen reduction reaction (ORR) catalysts is one of the keys to the practical application of fuel cells and Zn-air batteries (ZABs). Herein, a facile and green photochemical method is developed to synthesize pure-phase Mn 3 O 4 nanoparticles , which are uniformly anchored on nitrogen-doped reduced graphene oxide (N-rGO), followed by simple one-step annealing to highly catalytical active and stable MnO/N-rGO. The resultant MnO/N-rGO exhibits exciting ORR performance in alkaline media. Particularly, both GDE (gas diffusion electrode) half-cell and ZABs assembled from MnO/N-rGO have excellent overall performance and outstanding long-term durability, obviously better than Pt/C-based GDE half-cell and Pt/C + RuO 2 -based ZABs, respectively. It is mainly attributed to the synergistic effect between MnO nanoparticles and N-rGO support, which significantly increases the active sites and facilitates 4-electron transfer. This research paves a way for the green photochemical synthesis of transition metal oxide ORR catalysts at room temperature.
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JOURNAL OF SOLID STATE CHEMISTRY
·
2020
·
IF 2.726
Rong Zhao,Mengya Yang,Huan Wang,Tian-Nan Ye,Yi Liu,Dongming Yan
Developing non-noble metal catalysts with low price, functional activity, and robust stability for hydrogen evolution reaction (HER) is greatly desirable. Herein, we report Ni x Co 1-x P nanoparticles anchoring reduced graphene oxide (Ni x Co 1-x P/rGO) fabricated from metal-organic frameworks precursors via a facile phosphorization reaction under N 2 atmosphere. The as-prepared Ni x Co 1-x P/rGO catalysts were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), field-emission transmission electron microscopy (FE-TEM), X-ray photoelectron spectroscopy (XPS) and N 2 adsorption-desorption isotherm. In particular, the optimized Ni 0.14 Co 0.86 P/rGO composite shows a good performance towards HER electrocatalysis with a low overpotential of 181 mV at a current density of 10 mA cm −2 and Tafel slope of 65 mV dec −1 , benefiting from the synergistic effect of both Ni doping and rGO incorporation. Such collaborative interplay can significantly tune electronic conductivity and thereby promote the HER process. This simple fabrication process of Ni x Co 1-x P/rGO catalysts is expected to offer useful guidelines for exploring excellent HER catalysts.
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ELECTROCHIMICA ACTA
·
2020
·
IF 6.215
Na Ye,Zhao Jiang,Tao Fang
Direct methanol fuel cells (DMFCs) have attracted extensive attention due to clean, efficient characteristics and portable applications. In this work, a series of Pd x Cu y /reduced graphene oxide (rGO) catalysts are assembled and the catalytic performances are investigated for methanol oxidation reaction (MOR) in alkaline media. The intrinsic surface electronic structures of the Pd x Cu y /rGO bimetallic catalysts are also studied to clarify the reaction mechanism. The results reveal that Pd 1.2 Cu 0.2 /rGO exhibits superior catalytic activity (1101.58 A g Pd −1 ), 4.2 and 5.2 times higher than those of the commercial PtRu/C and Pd/C catalysts. CO stripping suggests that the onset potential for CO oxidation on the Pd 1.2 Cu 0.2 /rGO catalyst is lower than those on the commercial PtRu/C and Pd/C catalysts, implying that the anti-CO poisoning ability is enhanced. Combined with the analysis of X-ray diffraction (XRD), high-resolution transmission electron microscopy (HRTEM), X-ray photoelectron spectroscopy (XPS) and Raman, the enhanced catalytic activity and anti-CO poisoning ability are attributed to the charge transfer and lattice compression between Pd and Cu, which modify the d-band center and weaken the adsorption of CO. Furthermore, a volcano plot is found between the MOR activity and d-band center, indicating that the excellent MOR activity is attributed to the optimal d-band center with the moderate adsorption strength of CO-like intermediates.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2019
·
IF 14.229
Qiaoqiao Mu,Wei Zhu,Xian Li,Chufeng Zhang,Yanhui Su,Yuebin Lian,Pengwei Qi,Zhao Deng,Duo Zhang,Shuao Wang,Xing Zhu,Yang Peng
In this work, composite thin films comprising the 2D/2D MOF/rGO heterostructures assembled via Coulomb interaction are employed as the cocatalyst for photocatalytic CO 2 reduction for the first time. The electrostatic charge transfer and the strong π-π interaction induced in the heterostructure effectively modulate the electronic structure of the metal centers in the conductive 2D MOF (Ni 3 HITP 2 ), evidenced by Zeta Potentials, HR-TEM, XPS and XANES. The best thin-film catalyst with an optimal MOF/rGO ratio demonstrates a high CO evolution rate of 3.8 × 10 4 μmol h −1 g film −1 (0.46 min −1 in TOF) and a good selectivity of 91.74%, synergically contributed by the improved photoelectron harvesting on the rGO scaffold, the efficient charge transportation/transfer within the conductive and intimate 2D heterostructure, the coherent energy flow owing to aligned energy levels, and the enriched electron density at the isolated Ni-N 4 sites boosted by electrostatic charge transfer.
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