NANOTECHNOLOGY
·
2021
·Vol. 32
·期 50
·505703
·
IF 3.874
Ruxin Deng,Lingling Lin,Liya Li,Jian Wu
Transition metal phosphides are regarded as promising hydrogen evolution reaction (HER) electrocatalysts for water splitting. An efficient mass-transfer mechanism can be promoted through constructing microporous structures. In addition, introducing carbon materials as carriers to form interface interactions is beneficial for increasing electronic conductivity so as to promote the catalytic activity further. In this work, a nitrogen-doped graphene (NGO)-supported microporous nickel phosphide-nickel phosphite (Ni2P-Ni11(HPO3)8(OH)6@NGO, Ni2P-MPH@NGO), where Ni2P nanoparticles uniformly fill the micropores of Ni11(HPO3)8(OH)6 and then are supported on two-dimensional NGO via a simple two-step method, has been studied as a novel efficient electrocatalyst for HER. Compared with carbon nanotubes and graphene as carbon-based carriers, the optimized Ni2P-MPH@NGO catalyst shows excellent HER performance with a smaller overpotential, lower Tafel slope and long-term catalytic durability under acid conditions. The results demonstrate that NGO can enhance the catalytic activity of Ni2P-MPH@NGO efficiently. The results show that the synergistic effect of the microporous structure of Ni11(HPO3)8(OH)6 and NGO effectively improves the catalytic activity of the Ni2P-MPH@NGO composite catalyst, which provides a promising strategy for the design of a new low-cost and high-efficiency HER electrocatalysts.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMOSPHERE
·
2021
·
IF 7.086
Yaohong Ma,Leilei Xiao,Yunwei Wei,P. Senthil Kumar,Yang Tan,Yiwei Li,Hengchang Zang
Microbial fuel cells (MFCs) are sensitive to acidity variations in both bioelectricity generation and biochemical digestion aspects, therefore online pH monitoring is of necessity to guarantee optimal function of MFCs. Present pH meters hardly fulfill this special need. In this work, we designed a novel voltammetric pH sensor based on electrochemically reduced graphene oxide (rGO) modified screen printed electrode. By surface doping of alizarin, good linearity of pH sensing over the range of 4.0–9.0 can be realized. Fast readout can be acquired within 15 s for each test. pH monitoring for artificial wastewater with inoculum of granular activated sludge in a MFC was successfully illustrated. Specially, it was verified that the performance was improved with alizarin doping due to the enhanced rGO surface proton diffusion. This approach provides an online, calibration-free and long stable pH monitoring method for the future MFC development.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Zhen Qin,Hongxia Deng,Ruihua Huang,Shanshan Tong
Research into advanced adsorbents is one of the most promising ways to recycle precious metals from electronic wastes and minerals owing to their high uptake capacity, low maintenance requirements, and ease of use. Herein, a new adsorbent, MXene hybrid aerogels (MXGA), were successfully prepared by means of a hydrothermal reactor with the assistance of graphene oxide (GO) and a freezing-induced assembly method. The MXGA and pure MXene aerogel (MXA) displayed high selectivity to Au(III) ( K d = 2.61 × 10 6 for MXGA; K d = 3.23 × 10 5 for MXA) and Ag(I) ( K d = 2.03 × 10 5 for MXGA; K d = 1.76 × 10 8 for MXA) in a mixture of multiple metal ions. In addition, the trapping capability of MXGA (1063.8 mg/g) and MXA (1851.8 mg/g) for Au(III) was encouragingly high. The capture mechanism was investigated, where a surface complexation from oxygen-containing functional groups was proposed for Ag (I), and the sorption-redox process and electrostatic attraction in MXGA were proposed for Au(III) adsorption. A trapping efficiency of 99.9% for Au(III) by MXA was achieved within 1 min through the redox–capture process. Au(III) and Ag(I) captured on MXA and MXGA were rapidly trapped and the sorbent reused for more than five cycles, without a significant decrease in its capture capacity. Notably, compared with the capture ability at room temperature, MXGA architectures could also maintain superior capture and enrichment capabilities at temperatures as low as 0 °C. This unique property endowed the 3D MXene hybrid architectures with the promising ability to trap gold and silver from ores and electronic waste, providing a new method for the development of green platforms for noble metals regeneration.
✓ 已验证
产品关联
DOI
高影响因子
Materials
·
2021
·Vol. 14
·期 17
·5067
·
IF 3.623
Jiaxin Tang,Luo Wei,Shuaijie He,Jihui Li,Ding Nan,Liqiang Ma,Wanci Shen,Feiyu Kang,Ruitao Lv,Zhenghong Huang
An ultrasensitive enzyme-free glucose sensor was facilely prepared by electrodepositing three-dimensional dendritic Cu on a room temperature exfoliated graphite-derived film (RTEG-F). An excellent electrocatalytic performance was demonstrated for glucose by using Cu/RTEG-F as an electrode. In terms of the high conductivity of RTEG-F and the good catalytic activity of the dendritic Cu structures, the sensor demonstrates high sensitivities of 23.237 mA/mM/cm2, R2= 0.990, and 10.098 mA/mM/cm2, R2= 0.999, corresponding to the concentration of glucose ranging from 0.025 mM to 1.0 mM and 1.0 mM to 2.7 mM, respectively, and the detection limit is 0.68 μM. In addition, the Cu/RTEG-F electrode demonstrates excellent anti-interference to interfering species and a high stability. Our work provides a new idea for the preparation of high-performance electrochemical enzyme-free glucose sensor.Keywords:exfoliated graphite-derived film;dendritic Cu structures;enzyme-free glucose sensor
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2021
·
IF 8.742
Qi Zhong,Guogui Shi,Qing Sun,Peng Mu,Jian Li
Most super-wetting membrane materials are susceptible to oil pollution after separation process, causing a serious degradation of the separation ability. The rough structure of underwater superoleophobic membrane can effectively improve anti-fouling property, thus achieving stable separation. Herein, a composite polyvinyl alcohol-graphene oxide-titanium dioxide (PVA-GO-TiO 2 , PGT) membrane with rough structure is prepared through a simple hydrothermal and suction-filtration method. The as-prepared PGT membrane displays outstanding underwater superoleophobicity even for high-adhesion crude oil. Moreover, the as-fabricated membrane exhibits efficient oil-in-water emulsions separation performance with separation efficiency of larger than 99.1% and permeation flux of over than 762 L m −2 h −1 even after 10 min. Besides, the PGT membrane could separate various oil-in-water emulsions in corrosive environments with separation efficiency of higher than 99.3% and permeation flux of more than 760 L m −2 h −1 . More importantly, the as-prepared membrane could keep the underwater superoleophobicity after sanding test (200 times) and bending test (500 times). The composite membrane with excellent oil-in-water emulsions separation performance, corrosion resistance and mechanical stability has broad prospects in the field of water purification .
✓ 已验证
产品关联
DOI
高影响因子
Journal of the Mechanical Behavior of Biomedical Materials
·
2021
·
IF 3.902
Feng Hu,Hailin Lu,Zishuo Ye,Shoujing Zhang,Wenbo Wang,Li Gao
New fabrication methods and lubrication materials must be developed to improve the lubrication performance of artificial joints and increase the lubrication duration. Herein, a novel polyvinyl alcohol/polyethylene glycol/graphene oxide (PVA/PEG/GO) hydrogel was prepared by a physical cross-linking method, and then the hydrogel and its sustained-release solution were used as lubricant for friction evaluation. The results demonstrated that the slow-release gel solution has good lubrication performance, and coefficient of friction (COF) is only 0.04, which is much lower than the COF of distilled water (about 0.08) under the same conditions. The structure characterization results revealed that no new materials are formed in the gel. The results of thermogravimetric analyses and differential scanning calorimetry demonstrated that the addition of GO may improve the network crosslinking structure of the PVA/PEG hydrogel and improve its mechanical strength . In addition, PVA/PEG/GO hydrogel has superior self-healing function. The self-healing hydrogel did not break again after being pulled under 200 G of weights. The PVA/PEG/GO hydrogel with excellent slow-release lubricating performance and self-healing properties provides a novel candidate for design of long-term lubricating artificial joints, and is expected to promote the progress of artificial joint lubrication applications.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF CHROMATOGRAPHY A
·
2021
·
IF 4.759
Canhong Zhu,Jiani Wu,Xueting Jin,Yinghua Yan,Chuan-Fan Ding,Keqi Tang,Qiaohong Zhang
Herein, a hydrophilic graphene composite functionalized with glutathione (GSH) and L(+)-Cysteine (Cys) was prepared via a simple and fast synthesis route, which was named G@S@Au@GC. The combination attack with two different zwitterionic polymers resulted in enhanced adsorption sites for glycopeptides. The obtained G@S@Au@GC exhibited excellent performance on a low limit of detection (0.2 fmol), a high selectivity (HRP: bovine serum albumin = 1:1500), a good load capacity (250 μg•mg −1 ) and recovery rate (93%), which was also evaluated with IgG. Subsequently, 60 glycopeptides from complex biological sample (human saliva) were identified by Nano-LC-MS/MS. The advantages of combination attack, low-cost, simple and fast synthesis, and superior enrichment performance make G@S@Au@GC composite a bright future on glycoproteomics analysis and related diseases.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2021
·Vol. 139
·期 5
·51571
·
IF 3.125
Legang Chen,Zongxue Yu,Di Yin,Kunyao Cao,Chunxia Xie,Lijuan Zhu,Yong Jiang
Herein, a new strategy for improving epoxy coatings' anti-corrosion performance has been developed, which combined NH 2 -Ce-MOF with graphene oxide (GO) by hydrothermal method. First, the nanocomposite material's morphology and structure (GO-Ce-MOF) were confirmed by Fourier transform infrared, X-ray diffraction, TG, X-ray photoelectron spectroscopy, and scanning electron microscope (SEM) studies. The dispersity of the composite in the epoxy coating was evaluated by SEM and mapping analysis. Meanwhile, the anti-corrosion of as-prepared composite coatings was investigated in detail by the electrochemical impedance spectroscopy (EIS) and the Tafel polarization curve test. The results illustrated that 2.0 wt% GO-Ce-MOF/EP greatly enhanced the composite coating's anti-corrosion performance compared to other coatings. The reasons for the improvement of the anti-corrosion performance of the composite coating are attributed to the following two aspects: On the one hand, the addition of GO can provide a physical barrier to form a labyrinth effect to slow down the invasion of corrosive media into the metal substrate, on the other hand, the modification of GO can GO-Ce-MOF achieve better compatibility and dispersion in epoxy resin.
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2021
·
IF 6.707
Shen Shen,Hongbo Wang,Jiajia Fu
Three-dimensional (3D) graphene aerogel (3DGA) is an emerging photocatalyst support that imparts improved charge-carrier mobility. In this study, a 3DGA framework doped with carbon-quantum-dot-decorated TiO 2 nanosheets (3DGA@CDs-TNs) is fabricated by a hydrothermal method. 3DGA@CDs-TNs is then applied as a catalyst to degrade organic pollutants in aqueous solutions. The degradation rates for Cong-red (CR, 120 mg L -1 ), Rhodamine B (RhB, 20 mg L -1 ), and colorless tetracycline (TC, 100 mg L -1 ) reach 98.7% (after 2 h), 97.6% (after 2 h), and 99.8% (after 40 min), respectively, under visible-light irritation, and these rates are much higher than those for CDs-TNs and 3DGA alone. Meanwhile, the dyed wastewater was collected to verify the practicability of 3DGA@CDs-TNs. These enhanced efficiencies arise from the unique 3DGA@CDs-TNs configuration, in which the conductive 3DGA aerogel acts as an effective electron mediator that connects the CDs-TNs composite fragments, providing channels for fast charge transfer. In addition, 3DGA@CDs-TNs also exhibits excellent stability during recycling experiments, confirming its durability and practicability.
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Jiaxin Wang,Lili Ma,Jinmei He,Yali Yao,Xuedan Zhu,Lei Peng,Jie Yang,Kanshe Li,Mengnan Qu
The triboelectric nanogenerator (TENG) is a promising renewable energy conversion technology for harvesting various low-frequency mechanical motions in nature, such as human motion and raindrops. However, traditional TENGs still suffer from challenges including poor mechanical stability, low environmental adaptability, and single working mode. Herein, a scalable and flexible hybrid dielectric-based TENG (HD-TENG) based on triboelectric layer with internal micro/nano pores and hierarchical superhydrophobic micro-cilia structure has been developed and designed to effectively harvest energy from various human motions as well as natural environment (raindrops and waves). Working in the single-electrode mode, the HD-TENG demonstrates high output (∼465 V, ∼60 μA, ∼3.2 W m −2 ) and maintains a stable signal output under various deformations, vigorous washing, and high humidity environment. Furthermore, two liquid–solid generators are designed to separately harvest droplet energy and wave energy by bulk effect between placed top electrode and the developed HD-TENG. As a result, the output performance of the generators has been significantly improved through further parameter optimization, and peak power densities reach 215 mW m −2 and 1.3 W m −2 , respectively. Due to the strong adaptability and simple fabrication, the versatile HD-TENG can serve as self-powered devices with energy harvested from various sources in different application scenarios.
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS CHEMISTRY AND PHYSICS
·
2021
·
IF 4.094
Chengzhi Li,Hailin Lu,Guangshen Xu,Feng Hu,Jianhui Li,Lisha Wang
For the rotating parts of low-speed heavy machinery, it is difficult to replace and add lubricants, so coating the mechanical surface is an effective method to reduce friction and wear. In this study, a smooth functional film with good mechanical strength was designed and prepared by combining graphene oxide (GO) with polyethylene glycol (PEG). This wachieved by grafting PEG onto the GO surface. The effects of lubrication for the cases of flexible lubricating film, no film, and single film were analysed. The lubrication characteristics of GO–PEG flexible composite film under water lubrication, are discussed in detail. The results show that the mixture of PEG and GO can significantly improve the thermal stability, film forming properties and mechanical properties of GO–PEG composites. The membrane has a good friction limit performance. Compared with the uncoated surface, the friction coefficient is reduced by 74% and the wear rate is reduced by 70%.
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Xinpeng Che,Meiyan Wu,Guang Yu,Chao Liu,Huanfei Xu,Bin Li,Chaoxu Li
Flexible actuators with responses to various environmental stimuli have attracted great attention, but the issues of weak layer-to-layer bonding and low water resistance of cellulose-based actuators severely restrict their practical application. Herein, inspired by the internal structure of lignocellulose and reversible opening movement of pine cones by external humidity stimuli, a novel Janus film consisting of the insulated lignin-containing cellulose nanopaper (CNP) layer and the conductive reduced graphene oxide (rGO) layer was delicately designed and well fabricated through lignin adhesion between the two layers. Characterization showed that the obtained Janus film with a tensile strength of 141 MPa could be used as a flexible actuator, which could be operated based on water absorption and dehydration of the CNP layer as well as the light-to-heat conversion and high conductivity of rGO layer. Thus, the as-fabricated Janus film with excellent durability (folding resistance (>1000 times), good wet stability, and durable electrical actuation (>500 cycles)) had quick multi-responses to humidity, near-infrared radiation and electrical stimulation. Particularly, the resultant Janus film had the fastest response speed (1.875°/s/V) under the electrical stimuli compared to the reported carbon/polymer-based flexible actuators with comparable weights. Therefore, this CNP-based Janus film can be potentially used in many fields such as humidity sensor, bionic artificial arm/driving motor, and it could be helpful to develop facile and environmentally friendly strategies for the construction of multi-responsive Janus actuator/intelligent devices.
✓ 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）