International Journal of Electrochemical Science
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2023
·
IF 1.5
Ya’nan Zou,Yijing Ai,Jinfeng Du,Yucen Yao,Zejun Zhang,Baoli Wang,Wei Sun
In this paper, graphene-supported S-doped cobalt molybdate composite (S-CoMoO 4 /GR) was prepared by a simple in situ hydrothermal method. X-ray diffractometer (XRD) was employed to determine the component, which verified that S was doped in the CoMoO 4 . X-ray photoelectron spectroscopy (XPS), N 2 adsorption-desorption analysis and scanning electron microscopy (SEM) was used to observe the surface valence state, microstructure and the morphology of the composite, which demonstrated that S-CoMoO 4 was dispersed on the carrier of GR with small plate morphology. Then, the composite was applied on the surface of glassy carbon electrode with oxygen evolution reaction (OER) performance investigated by different electrochemical technologies including linear sweep voltammetry, cyclic voltammetry, electrochemical impedance spectroscopy and i-t tests. The results demonstrate that the prepared catalyst needs an overpotential of 354 mV to achieve the current density of 10 mA cm −2 (η 10 ) and presents good long-term stability with a negligible current decrease in 30 h i-t test, verifying its good OER performance.
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Advanced Composites and Hybrid Materials
·
2023
·Vol. 6
·期 6
·1-15
·
IF 20.1
Xiang Lele,Darboe Abdou Karim,Luo Zhihong,Qi Xiaosi,Shao Jiao-jing,Ye Xiao-Juan,Liu Chun-Sheng,Sun Kai,Qu Yunpeng,Xu Jing,Zhong Wei
Interface engineering and/or impedance matching characteristic played a very important role in microwave absorption. To simultaneously make best of these aspects, herein, two-dimensional (2D)/2D reduced graphene oxide (RGO)/MoSe 2 van der Waals heterojunctions (VDWHs) were elaborately designed and successfully produced in large scale and high efficiency through a simple solvothermal method. By increasing the amount of graphene oxide (GO) from 15 to 45 mg, the designed 2D/2D RGO/MoSe 2 VDWHs with enhanced RGO contents and interfaces could be synthesized, which resulted in their progressively boosted comprehensive microwave absorption properties (MAPs). Furthermore, the proposed route could also be expanded to fabricate 2D/2D RGO/MoS 2 VDWHs. The obtained results demonstrated that the enhanced amount of GO effectively improved their impedance matching characteristics, conductivity loss, and polarization loss capabilities of 2D/2D RGO/MoX 2 (X = Se and S) VDWHs, which contributed to their enhanced comprehensive MAPs. In particular, the RGO/MoSe 2 VDWHs displayed a minimum reflection loss of − 65.34 dB at 6.40 GHz and an effective absorption bandwidth of 4.20 GHz. Therefore, the findings not only presented a combined composition modulation and interface engineering strategy to simultaneously take full advantage of impedance matching characteristics and interfaces for improving the comprehensive MAPs but also provided a simple and propagable route to design and synthesize 2D/2D RGO/MoX 2 (X = Se and S) VDWHs, which could be acted as the good candidates for lightweight high-efficiency microwave absorbers.
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ChemistrySelect
·
2023
·Vol. 8
·期 44
·e202303144
·
IF 2.1
Sainan Cao,Yongqi Pan,Huangdi Feng,Jingxia Yang
Graphical CuS with three different morphologies (nanoparticles-NP, nanorods-NR, nanoflakes-NFS) were used as catalysts for A 3 coupling reaction, and CuS-NP exhibited the best behavior due to its higher specific surface area and higher Cu + /Cu 0 , which is benefit to promot the activation of alkyne terminal C−H. A 3 coupling reaction can be used to efficiently synthesize propargylamine, which is an important bioactive molecule intermediate, and copper sulfide (CuS) as its catalyst is rarely reported. Herein, CuS with different morphologies including nanoflowers (NFS), nanorods (NR), nanoparticles (NP) were synthesized and applied to the A 3 coupling reaction. The results show that CuS NP has the highest catalytic activity (99 % conversion) compared to other CuS, and also has good group compatibility and recyclability. Combining the activity with the CuS surface structure checked by XPS, BET and HRTEM etc., the excellent catalytic performance of CuS NP can be attributed to its higher specific surface area ((S BET =26.9 m 2 /g, S Langmuir =144.2 m 2 /g), and higher Cu + /Cu 0 (58.9 %), S n 2− (16.7 %). The large specific surface area can provide more active sites, and higher Cu + /Cu 0 , S n 2− content are conducive to promoting the activation of alkyne terminal C−H, which is an important step in the A 3 coupling reaction.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2023
·
IF 22.1
Xianbo Yu,Feng Yan,Yang Zhao,Bo Geng,Xinzhi Ma,Lili Wu,Xitian Zhang,Yujin Chen
The inferior hydrogen evolution reaction (HER) catalytic performance of MoS 2 can be attributed to its small edge ratio, large inert substrate surface, and poor electrical conductivity, while the multiple strategies are expected to be employed simultaneously to modulate the electronic structure of MoS 2 and yield catalysts with superior HER catalytic performance. Here, we report a MoS 2 containing a 1 T phase with expanded layer spacing and construct it as a heterostructured material with MoO 2 (MoO 2 @E-MoS 2 ). Specifically, the presence of the 1 T phase and expanded layer structure of MoS 2 can enhance electrode conductivity, increase active site exposure, promote H 2 O adsorption, and optimize the Gibbs-free energy of hydrogen. The constructed heterostructure can modulate the electronic structure of the catalyst, enhance electron transfer at the interface, elevate water adsorption energy, and reduce the hydrogen reaction energy barrier. Moreover, density functional theory calculations indicate that the S site of MoS 2 in this catalyst exhibits a higher affinity for H 2 O adsorption, while the Mo site demonstrates a greater capacity for H* adsorption/desorption. Ultimately, MoO 2 @E-MoS 2 shows low overpotentials of 93 and 99 mV at a current density of 10 mA cm −2 , as well as exceptional long-term stabilities exceeding 70 and 130 h at current densities ranging from 10 to 30 mA cm −2 in acidic and alkaline media, respectively.
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MOLECULES
·
2023
·Vol. 28
·期 23
·7846
·
IF 4.6
Ligang Ma,Wenjun Jiang,Chao Lin,Le Xu,Tianyu Zhu,Xiaoqian Ai
Ultra-thin two-dimensional materials are attracting widespread interest due to their excellent properties, and they are becoming ideal candidates for a variety of energy and environmental photocatalytic applications. Herein, CdS nanorods are successfully grown in situ between a monolayer of g-C3N4using a chemical water bath method. Continuous ultrasound is introduced during the preparation process, which effectively prevents the accumulation of a g-C3N4layer. The g-C3N4@CdS nanocomposite exhibits significantly enhanced photocatalytic activity for hydrogen production under visible-light irradiation, which is attributed to a well-matched band structure and an intimate van der Waals heterojunction interface. The mechanism of photocatalytic hydrogen production is discussed in detail. Moreover, our work can serve as a basis for the construction of other highly catalytically active two-dimensional heterostructures.Keywords:monolayer g-C3N4;CdS;heterojunction;photocatalytic hydrogen production
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Junjie Zhang,Yongjia Hong,Xu Tang,Yong Chen,Wenran Gao,Yuncheng Cai,Ningning Dong,Jiazi Xu,Li Zhang,Quli Fan,Bin Sun
The rational design of active sites in nanocarbons are the long-term pursuit for their practical applications. However, N, as the most potential active site, still encounters the problems of low atom utilization efficiency and stability in practical environmental remediation. Herein, we successfully constructed synergistic active sites consisting of graphitic N, pyridinic N, and thiophene S in heavy S, N co-doped hollow graphene spheres (HSNGS). The HSNGS exhibited exceptional efficiency in degrading tetracycline in real water, with a turnover frequency of 6.24 min −1 , which is among the highest reported. Moreover, tetracycline dissolved in practical water could be continuously and rapidly eliminated by passing through a column filled with HSNGS, maintaining its high performance even after 40 consecutive cycles. In the synergistic active sites, graphitic N and pyridinic N species accepted electrons from peroxymonosulfate, generating singlet oxygen for tetracycline degradation. Simultaneously, thiophene S coordinated with metal ions present in the practical water, synergistically enhancing the degradation of tetracycline. Additionally, the coordinated metal ions provided protection for the synergistic active sites during peroxymonosulfate activation, preventing their oxidation and enabling the continuous and rapid degradation of tetracycline. This work opens up possibilities for the industrial application of nanocarbon materials in environmental remediation.
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ENERGY & FUELS
·
2023
·
IF 5.3
Dongfang Lv,Jiaming Li,Qiwei Bo,Zhongxu Xie,Caili Dai,Guang Zhao
A high-temperature- and high-salinity-resistant dispersed particle gel (DPG) was successfully prepared by shearing a modified nanographite-strengthened bulk gel. Through the preparation requirements, a modified nanographite-strengthened bulk gel was prepared using a modified nanographite hybrid polymer and monomer cross-linkers. The effect of the nanographite hybrid polymer, cross-linkers, temperature, and salinity on the gel performance of the strengthened bulk gel was systematically studied. The higher proportion of bound water and the dense three-dimensional network structure of the strengthened bulk gel are the keys to temperature and salinity resistance. Rheological test results show that the bulk gel had excellent viscoelasticity. The effects of temperature, salinity, and aging time on DPG coalescence were studied from the perspective of micromorphology and particle size. The accelerated thermal motion at a high temperature increases the probability of collision and coalescence between particles. The high-salinity compression diffusion double layer reduces the electrostatic repulsion between particles. Finally, the strengthening mechanism of DPG by the modified nanographite was discussed. The high-temperature- and high-salinity-resistant DPG may be an alternative for profile control and water plugging in deep oil reservoirs.
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ACS Applied Nano Materials
·
2023
·
IF 5.9
Cijun Shuai,Xiuwen Gao,Yifeng Wang,Hongyi Qian,Wei Li,Shuling Liu,Huarui Zhou,Shuping Peng,Fangwei Qi
Bismuth sulfide (Bi2S3) could respond to near-infrared light to generate photocurrent, demonstrating tremendous potential in constructing self-powered electrical stimulation to accelerate bone regeneration. Nevertheless, the facile recombination of electron–hole pairs undermined its photoelectric performance. Herein, a sea-buckthorn-like nanostructured Bi2S3–BaTiO3 was synthesized by loading BaTiO3 nanoparticles onto Bi2S3 nanorods through a self-assembly method and then integrated into poly-L-lactic acid (PLLA) powders to fabricate PLLA/Bi2S3–BaTiO3 scaffolds. Piezoelectric BaTiO3 would deform under stress to produce instantaneous polarization, which triggered positive and negative charges presented on the relative surfaces of BaTiO3. Thus, the photogenerated electrons and holes of Bi2S3 would be, respectively, transferred to the positive and negative charged surfaces of BaTiO3, thereby achieving the electron–hole separation. Results revealed that under ultrasonic irradiation, the photoluminescence peak intensity of Bi2S3–BaTiO3 was significantly reduced compared with that of Bi2S3, confirming the improved electron–hole pair separation. Accordingly, the photocurrent of Bi2S3–BaTiO3 was increased by approximately 1.4 times in comparison with that of Bi2S3. The enhanced photocurrent effectively promoted cell proliferation and differentiation by upregulating alkaline phosphatase expression, enhancing calcium nodule deposition, and promoting cellular Ca2+ influx. Consequently, this work provided a perspective for establishing a self-powered electrical stimulated scaffold for bone repair.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2023
·
IF 6.2
Lianshan Sun,Chunyu Yue,Jianxun Zhao,Peng Chen,Heng Liu,Xinwei Wang,Wanqiang Liu
The three-dimensional mesh CoS 2 -MoS 2 -CNT composite material with abundant pores was prepared by two-step hydrothermal method as CoS 2 -MoS 2 -CNT functional separator and introduced into lithium-sulfur battery. XRD , XPS and SEM tests of CoS 2 -MoS 2 -CNT proved that the material was successfully prepared, and its morphology was a three-position porous structure composed of interwoven nanotubes and nanosheets . The results of Li 2 S 6 adsorption experiment and visual penetration experiment show that CoS 2 -MoS 2 -CNT composite material has strong adsorption effect on LiPS, and can prevent LiPS from passing through the separator, which effectively inhibits the shuttle effect. CoS 2 -MoS 2 -CNT coating effectively plays the synergistic effect of each component to achieve effective fixation and transformation of LiPS, which solves the shortage of lithium-sulfur batteries. Cells with CoS 2 -MoS 2 -CNT functional separators have a high initial specific capacity (0.2C, 1411 mAh g −1 ), excellent rate performance and excellent cycle stability at large currents (0.13% attenuation per cycle at 2C).
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ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Zheng Liu,Hong Ding,Lin Qi,Jing Wang,Yubao Li,Limin Liu,Ganjun Feng,Li Zhang
Developing bone implants with dynamic self-adjustment of antibacterial, angiogenic, and osteogenic functions in line with a bone regenerative cascade is highly required in orthopedics. Herein, a unique core–shell nanorods array featuring a thin layer of NiS coated on each SrTiO3 nanorod (NiS@SrTiO3) was in situ constructed on titanium (Ti) through a two-step hydrothermal treatment. Under near-infrared (NIR) irradiation, the photoresponsive effect of NiS layer in synergy with the physical perforation of SrTiO3 nanorods initially enabled in vitro antibacterial rates of 96.5% to Escherichia coli and 93.1% to Staphylococcus aureus. With the degradation of the NiS layer, trace amounts of Ni ions were released, which accelerated angiogenesis by upregulating the expression of vascular regeneration-related factors, while the gradual exposure of SrTiO3 nanorods could simultaneously enhance the surface hydrophilicity in favor of cell adhesion and slowly release Sr ions to promote the proliferation and differentiation of MC3T3-E1 cells. The in vivo assessment verified not only the satisfactory antibacterial effect but also the superior osteogenic ability of the NiS@SrTiO3/Ti group with the aid of NIR irradiation, finally promoting the osseointegration of the Ti implant. The modification method endowing Ti implant with antibacterial, angiogenic, and osteogenic functions provides a new strategy to improve the long-term reliability of Ti-based devices.
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Electrocatalysis
·
2023
·
IF 3.1
Zhao Hongyu,Zhang Hao,Huang Ruoyu,Wang Jianmin,Cai Jiajia,Hu Jing,Chen Zhijie,Li Yongtao,Li Haijin
Developing excellent electrocatalysts is a significant step in accelerating the widespread implementation of the electrochemical hydrogen evolution reaction (HER). MoS 2 is one of the promising alternatives to platinum-based catalysts, while its HER activity is far from Pt due to the lack of active sites. It is urgent to develop a novel strategy to activate the basal planes of MoS 2 for enhancing the HER activity. Herein, a facile hydrothermal method with a low-temperature H 2 O 2 etching method is developed to fabricate MoS 2 with O-doped and S-vacancy dual defects. The dual defects MoS 2 nanosheet demonstrates remarkable hydrogen evolution reaction (HER) activity, achieving 10 mA cm −2 with a small overpotential of around 143 mV in 0.5 M H 2 SO 4 . Graphical Abstract
Construct dual-defect MoS2 via a facile hydrothermal method and mild H2O2 etching process.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Yinghong Ji,Xiaoyan Ding,Yanjun Xue,Jingjing Wang,Jian Tian
The formation of composites by loading co-catalysts on semiconductor photocatalysts to improve hydrogen (H 2 ) evolution performance is a feasible strategy. Metallic 1T phase molybdenum disulfide (MoS 2 ) as cocatalysts were decorated on zinc indium sulfide (ZnIn 2 S 4 ) nanoflowers by a grinding method to construct 1T-MoS 2 @ZnIn 2 S 4 composites. The H 2 production rate of 1T-MoS 2 @ZnIn 2 S 4 composites with optimum 7 wt% 1T-MoS 2 loading achieves 15.6 mmol g −1 h −1 , 5.5 times higher than ZnIn 2 S 4 nanoflowers. The apparent quantum efficiency (AQY) increases from 3.1 % (ZnIn 2 S 4 nanoflowers) to 13.0 % (1T-MoS 2 @ZnIn 2 S 4 composites) under the wavelength light irradiation at λ = 370 nm. The loading of metallic 1T-MoS 2 with abundant edge and substrate active sites on ZnIn 2 S 4 can enhance visible light absorption, promote the transfer of electrons, and inhibit carrier recombination, thereby improving photocatalytic performance. This work offers inspiration for the design of composite photocatalysts with efficient photocatalytic capabilities.
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