INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2022
·
IF 4.326
Yunxia Bai,Mei Li,Xuemei Liu,Jinyu Han,Xinli Zhu,Qingfeng Ge,Hua Wang
Photocatalytic CO2 reduction is a promising route to simultaneously address two critical issues related to the energy and environment. Herein, a direct Z-scheme photocatalytic system, Ti3+ defective TiO2/CdS nanoflowers, was fabricated to enhance the production of C1–C3 products from CO2 reduction. First, nanoflower-like TiO2 (NF-TiO2) is prepared using a TiB2 precursor to build in Ti3+ defects. Then, the NF-TiO2/CdS heterojunctions are constructed via the sulfurization of TiO2/Cd-MOF. Importantly, the optimal heterojunction photocatalyst NF-TiO2/CdS0.6 exhibits a highly promoted CO2 reduction activity not only for CO and CH4 but also for C2–C3 hydrocarbons. The cumulative yields of CO and CH4 are 1007.0 μmol/g and 83.5 μmol/g (2.5 h), respectively, and a yield of 55.3 μmol/g (2.5 h) of C2–C3 hydrocarbons is obtained. This enhanced yield of C1–C3 products is attributed to the synergistic effects of abundant Ti3+ defects that increase adsorption and activation of CO2, the large surface area that provides sufficient active sites, and a direct Z-scheme heterojunction with a good intimate contact interface that effectively separates charge carriers and accumulates electrons with strong reducibility. Moreover, the photoluminescence analysis of hydroxyl radicals was conducted to provide evidence for the direct Z-scheme mechanism. This work provides a facile method for the construction of a TiO2-based direct Z-scheme photocatalytic system for improving photocatalytic performance toward CO2 reduction.
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Journal of Materials Chemistry A
·
2022
·Vol. 10
·期 28
·14954-14964
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IF 14.511
Hao Liu,Haochang Chen,Shunzhe Zhang,Kaifeng Wang,Lei Yang,Yujie Chen,Hezhou Liu,Hua Li
Combining two distinct materials to obtain high-performance electrode materials is a viable solution, but the process is inefficient, taking at least two processes and requiring tens of hours. Here, a unique bipolar pulse electrodeposition process is proposed, which effectively manufactures a composite electrode material with strong synergistic connection between NiCoS and PPy in a single step. Taking advantage of the synergistic impact of the nickel–cobalt sulfide nanoflower structure with a wide electrode–electrolyte contact area, as well as PPy with the appropriate thickness, the composite NiCoS/PPy electrode exhibits a high specific capacitance of 1848.8 F g−1 at a current density of 1 A g−1 and excellent rate performance. Due to the strong-coupling and the protection of the PPy layer, the electrode material possesses ultra-high cycling stability at high current density (96.15% capacitance retention after 10 000 cycles at 10 A g−1). When compared to other typical methods, this approach greatly simplifies the composite electrode material production process, requiring just one step and 2400 seconds, which is hundreds of times faster. Furthermore, an assembled asymmetric supercapacitor (ASC) device of NCS/P-3//activated carbon (AC) achieves a high energy density of 48.79 and 40.21 W h kg−1 at a power density of 750 and 7500 W kg−1, respectively, while maintaining a long cycle-life. It is proved that on the premise of simplifying the preparation process by bipolar pulse electrodeposition, the composite electrode material has excellent electrochemical properties and can be used in high-capacity asymmetric supercapacitors.
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ANALYTICAL AND BIOANALYTICAL CHEMISTRY
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2022
·Vol. 414
·期 19
·5917-5928
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IF 4.478
Zuo Jiabao,Shen Yuliang,Gao Juanjuan,Song Haiou,Ye Zhiwen,Liang Ying,Zhang Shupeng
Flexible sensing is an alternative to traditional sensing and possesses good flexibility and wearability. Intrinsically conductive polymers, particularly poly(3,4-ethylenedioxythiophene): poly(styrenesulfonate) (PEDOT:PSS), have received significant attention due to their high mechanical flexibility and good biocompatibility. Here, we report the design of highly conductive and electrochemically active PEDOT:PSS-coated plastic substrate electrodes by combining N-doped graphene (NG) or S-doped graphene (SG) with methanesulfonic acid-treated PEDOT:PSS (denoted as NG-f-MSA-PEDOT:PSS/PET and SG-f-MSA-PEDOT:PSS/PET) by a simple drop-coating method. At room temperature, the NG-f-MSA-PEDOT:PSS/PET electrode demonstrated the lowest detection limits of 17.09, 33.84, 28.30, and 44.96 nM for paracetamol, uric acid, dopamine, and catechol (S/N = 3), respectively. The NG-f-MSA-PEDOT:PSS/PET electrode had good anti-interference ability and reproducibility without employing expensive noble metals and requiring much effort to polish the surface of traditional glass carbon electrodes. Most importantly, this film electrode could maintain a stable electrochemical response under different bending and crease states and had excellent mechanical stability and flexibility. Graphical abstract
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高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2022
·Vol. 33
·期 19
·15754-15762
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IF 2.779
Zhang Ting,Chu Xueying,Jin Fangjun,Xu Mingze,Zhai Yingjiao,Li Jinhua
Sensors for rapid and reliable detection of biomolecules are crucial for clinical medical diagnoses. Here, a rapid, ultra-sensitive, magnetic-assisted biosensor based on resonance Raman scattering at MoS 2 @Fe 3 O 4 composite nanoflowers is presented. Raman shifts and X-ray photoelectron spectra indicated that the composite was formed via Fe–S covalent bonds. Convenient magnetic separations could be performed because of the superparamagnetic Fe 3 O 4 nanoparticles. MoS 2 E 1 2g and A 1g Raman peaks were used as probe signals for anti-interference immunoassays. The probe unit of the immunoassay also included goat anti-human IgG molecules that were used as the target analyte. Au substrates coupled with the goat anti-human IgG were used as capture units to form sandwich biosensors. Because of the magnetic enrichment, the detection limit was improved by three orders-of-magnitude and the detection time was reduced from 1.5 h to 1 min. Sandwich biosensors using MoS 2 @Fe 3 O 4 nanoflowers as Raman probes could be very promising sensors for proteins, antigens, and other immunogenic biopolymers, as well as for corpuscular viruses and cells.
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高影响因子
Nanomaterials
·
2022
·Vol. 12
·期 12
·2087
·
IF 5.719
Xinman Tu,Linhong Ge,Lamei Deng,Li Zhang
Metal sulfide is often utilized as a catalyzed material to form colorimetric response system for some heavy metal detection. While the aggregation effect and conventional morphology limited the catalyzed efficiency. Herein, a robust method based on morphology adjustment was proposed to improve the dispersibility and catalytic performance of CuS. The results demonstrated when the solvent ratio of ethylene glycol and dimethyl sulfoxide arrived at 3:1, it displayed an optimal structure which is like a patulous flower. Meanwhile, an optimal surface binding energy (ΔE) of 120.1 kcal/mol was obtained via theoretical calculation model. The flower-like structure caused a 2-fold increase in the catalytic level. Subsequently, the CuS was employed to make colorimetric detection of Cr(VI) in water. The assay results exhibited a linear range of the Cr(VI) from 60 to 340 nM, the limit of detection was 1.07 nM. In the practical tests for Qianhu lake water, the spiked recoveries were 93.6% and 104% with the RSD of 4.71% and 3.08%. Therefore, this CuS-based colorimetric method possesses a satisfactory application prospect for the Cr(VI) determination in water.Keywords:CuS;morphology adjustment;solvent ratio;Cr(VI);colorimetric detection
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MATERIALS CHEMISTRY AND PHYSICS
·
2022
·
IF 4.778
Na Lei,Yin Qiao,Guanfu Liu,Renhao Xu,Guohua Jiang,Muslum Demir,Pianpian Ma
Cobalt-based perovskite SrCo 0.875 Nb 0.125 O 3 is an advantageous electrode material for supercapacitors . However, the particle form of SrCo 0.875 Nb 0.125 O 3 is not conducive to the electrochemical behavior. Based on this, surface MnO 2 modified SrCo 0.875 Nb 0.125 O 3 on carbon cloth (MnO 2 @SrCo 0.875 Nb 0.125 O 3 @CC) has been prepared as supercapacitor electrode. The dandelion-like morphology of MnO 2 significantly increases the specific surface area and inhibits the grain agglomeration of SrCo 0.875 Nb 0.125 O 3 , thus promoting the ion diffusion during the electrochemical process. As a result, the electrochemical performance of the composite is significantly optimized due to the synergistic effect of SrCo 0.875 Nb 0.125 O 3 and MnO 2 . The MnO 2 @SrCo 0.875 Nb 0.125 O 3 @CC electrode yields an ultra-high specific capacitance of 2066.0 mF cm −2 at 2 mA cm −2 current density. Compared with SrCo 0.875 Nb 0.125 O 3 @CC electrode and MnO 2 @CC electrode, this work provides a much improved performance. Besides, an asymmetric supercapacitor composed of MnO 2 @ SrCo 0.875 Nb 0.125 O 3 @CC as positive electrode and CuS@CC as negative electrode exhibits a voltage window of 1.8 V and a specific capacitance of 114.6 mF cm −2 when the current density is 3 mA cm −2 . A high energy density of 51.57 μ Wh cm −2 is achieved at a power density of 4.86 mW cm −2 for the device.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2022
·Vol. 33
·期 20
·16077-16098
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IF 2.779
Chen Keke,Feng Hange,Li Lingwei,Luo Menghao,Xue Shaolin,Sang Jingxin
The excellent photoresponse of semiconductors enables them as a promising photocatalyst for photocatalytic degradation of organic pollutants and antibiotics, but their practical applications are limited by photogenerated carrier recombination, instability, and fixed energy band positions. Herein, we designed and synthesized a dual Z-scheme flower-like spherical Ag 3 PO 4 /MoS 2 /g-C 3 N 4 (AMN) photocatalyst loaded with different mass of g-C 3 N 4 (3, 5 and 7 mg). Under visible light irradiation, MoS 2 enhanced the light absorption range of AMN composite. The holes concentrated in the valence band of Ag 3 PO 4 provide strong oxidation capacity, and the electrons retained in conduction band of g-C 3 N 4 provide strong reduction ability in the photocatalytic system. It is helpful to improve the separation efficiency of photogenerated carriers and enhance the photocatalytic activity of AMN composite. The AMN photocatalyst loaded with 5 mg g-C 3 N 4 (AMN-5) has the optimal photocatalytic activity. The photocatalytic degradation efficiency of the photocatalyst for methylene blue (MB) within 24 min is 3.98, 1.85, and 1.17 times that of g-C 3 N 4 , Ag 3 PO 4 , and Ag 3 PO 4 /MoS 2 , respectively. After three cycles, the degradation efficiency of AMN-5 for MB decreased from 99.44% to 90%, about 3.79 times of Ag 3 PO 4 (23.77%). In addition, the optimal AMN-5 photocatalyst also has excellent photocatalytic degradation efficiency for Rhodamine B (RhB) and tetracycline (TC). This design and concept provide a promising insight for the photocatalytic degradation of pollutants.
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Micro & Nano Letters
·
2022
·Vol. 17
·期 11
·259-271
·
IF 0.98
Yunting Wang,Qing-an Qiao,Honglan Cai,Juan Jin,Hongwei Gao,Yanbin Xu
g-C 3 N 4 was employed as a modified substance for modification engineering of wurtzite-ZnS photocatalysts to overcome its limited light response and stability. The g-C 3 N 4 /ZnS (CNZS) photocatalyst was synthesized by solvothermal reaction of g-C 3 N 4 , thiourea and zinc acetate. The results show that wurtzite-ZnS spheres were loaded on the surface of g-C 3 N 4 with well uniformed size. The photocatalytic activity of the catalyst was determined by the degradation of MB and Rh.B under visible light. The degradation rates of Rh.B and MB by CNZS were 96% and 97%, much better than that of pure ZnS. The addition of g-C 3 N 4 promoted the visible light response of wurtzite-ZnS and inhibited the recombination of photogenerated electrons with holes. The density functional theory (DFT) results indicated that the components of both valence band and conductive band were changed for the CNZS system. Compared to pure ZnS, the band gap of CNZS was decreased about 0.5 eV, and the work function calculations were in good agreement with the experimental results. As a result, the heterostructure of CNZS made it beneficial to the electron transfer from g-C 3 N 4 (2p of N) to ZnS (3p of S) and absorption edge has been extended to about 600 nm.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
H.T. Zheng,Y.C. Zhang,X. He,H.H. Liu,A.Y. Chen,X.F. Xie
Self-healing hydrogels exhibit special self-healing or self-recovery function like human skin after injuring, thereafter, draw lots of attention in biomedical applications. However, self-healing hydrogels with strong mechanical and rapid self-healing properties are not fully realized. MoS 2 /polyvinyl alcohol (PVA) hydrogels are developed to achieve rapid self-healing function by utilizing the excellent photothermal conversion effect of MoS 2 under near-infrared (NIR) light. Effects of microstructure and content of MoS 2 on self-healing and mechanical properties of MoS 2 /PVA hydrogels are investigated, including flower-like MoS 2 spheres by bottom-up hydrothermal reaction and MoS 2 sheets by liquid-phase stripping method. The MoS 2 /PVA hydrogels embodied with the two types of MoS 2 were produced by simple freezing/thawing method, and exhibited rapid self-healing function, together with simultaneous enhancement of strength and ductility. The MoS 2 /PVA hydrogel modified by flower-like MoS 2 spheres with a content of 0.5 wt% presents a significant self-healing function with a healing efficiency up to 90.0% within 5 min, and an enhancement of tensile strength of 9.1 MPa (190% to blank PVA) and a ductility of 162.5% (290% to blank PVA). Furthermore, the MoS 2 /PVA gel with flower-like MoS 2 spheres into the PVA networks produces a significant enhancement of fracture strength (58.4 MPa) after fully curing, characterized by an increases of 612% compared with the pure PVA. The photo-induced self-healing and strengthening effects of the MoS 2 /PVA hydrogels are discussed.
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高影响因子
RENEWABLE ENERGY
·
2022
·
IF 8.634
Jing Jiang,Mei Chen,Yang Luo,Ying Xu,Lunhong Ai
Solar water splitting is essential for future sustainable hydrogen production using renewable resources , but it remains challenging due to expensive solar generators and inefficient electrocatalysts . Herein, we propose a solar thermoelectric water electrolysis system using multifunctional iron foam-supported iron sulfide nanosheet arrays (FeS/IF) as the photothermal conversion unit in solar thermoelectric generator (STEG) and electroactive electrode in water electrolysis. The photothermal FeS/IF rapidly converts solar light to localized heat, supplying the desirable temperature difference for thermoelectric power generation . Meanwhile, the FeS/IF acts as a bifunctional electrode to effectively catalyze the hydrogen and oxygen evolution reactions in alkaline media . As a prototype integrated system , four series-connected FeS/IF-STEG are applied to self-power water splitting with the production rate of 10.7 and 5.3 μmol h −1 for hydrogen and oxygen, respectively. The present study offers new opportunities for rational design of integrated energy systems from renewable solar to sustainable hydrogen.
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
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2022
·
IF 4.831
Suyang Li,Pei Liang,Qiang Chen,Biao Sun,Ziyang Shang,Jie Huang,Mingqiang Zou,Xiaohua Qi,Jiechen Wu
A new Mo 1- x W x S 2 two-dimensional nanosheets were prepared by the one-pot method. After certain Mo atoms in MoS 2 were replaced by W ones in a hydrothermal reduction procedure, Mo 1- x W x S 2 was formed on the Mo foil. Well enhanced Mo 1- x W x S 2 nanosheets were prepared when the sodium tungstate concentration got under control. Various characterizations were carried out, which indicate that Mo 1- x W x S 2 nanosheets with good crystallinity. Compared with MoS 2 , the Raman intensity of Rhodamine 6G (10 −6 M) was amplified by 1.7 times with Mo 1- x W x S 2 nanosheets as the substrate. The characteristic Raman peaks could still be clearly distinguished until the concentration of Rhodamine 6G (R6G), Methylene blue (MB) and Crystal violet (CV) down to 10 −8 , 10 −8 and 10 −7 M, respectively. With abundant edge active sites that facilitate charge transfer, Mo 1- x W x S 2 nanosheets could better enhance SERS signals of target detection molecules and get a good linear relationship exists within the concentration and Raman peak strength. In addition, R6G SERS detection also shows excellent reproducibility and long-term stability of this TMDs SERS substrate.
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高影响因子
Journal of Advanced Ceramics
·
2022
·Vol. 11
·期 7
·1117-1130
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IF 11.534
Tao Junnan,Wang Mingyuan,Liu Guiwu,Liu Qinqin,Lu Lei,Wan Neng,Tang Hua,Qiao Guanjun
Converting water into hydrogen fuel and oxidizing benzyl alcohol to benzaldehyde simultaneously under visible light illumination is of great significance, but the fast recombination of photogenerated carriers in photocatalysts seriously decreases the conversion efficiency. Herein, a novel dual-functional 0D Cd 0.5 Zn 0.5 S/2D Ti 3 C 2 hybrid was fabricated by a solvothermally in-situ generated assembling method. The Cd 0.5 Zn 0.5 S nano-spheres with a fluffy surface completely and uniformly covered the ultrathin Ti 3 C 2 nanosheets, leading to the increased Schottky barrier (SB) sites due to a large contact area, which could accelerate the electron-hole separation and improve the light utilization. The optimized Cd 0.5 Zn 0.5 S/Ti 3 C 2 hybrid simultaneously presents a hydrogen evolution rate of 5.3 mmol/(g·h) and a benzaldehyde production rate of 29.3 mmol/(g·h), which are ∼3.2 and 2 times higher than those of pristine Cd 0.5 Zn 0.5 S, respectively. Both the multiple experimental measurements and the density functional theory (DFT) calculations further demonstrate the tight connection between Cd 0.5 Zn 0.5 S and Ti 3 C 2 , formation of Schottky junction, and efficient photogenerated electron—hole separation. This paper suggests a dual-functional composite catalyst for photocatalytic hydrogen evolution and benzaldehyde production, and provides a new strategy for preventing the photogenerated electrons and holes from recombining by constructing a 0D/2D heterojunction with increased SB sites.
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