ACS Applied Nano Materials
·
2023
·
IF 5.9
Fangwei Qi,Xiaosong Chen,Huixing Li,Gang Chen,Xinrui Luo,Shiyu Xiong,Shuping Peng,Cijun Shuai
Bismuth sulfide (Bi2S3) enabled us to transform light signals into electrical signals via the photoelectric effect, which exhibited tremendous prospects on constructing wireless electrical stimulation for accelerating nerve regeneration. However, too rapid recombination of photogenerated electron–hole pairs weakened its photocurrent. Herein, the Bi2S3/Ti3C2Tx heterojunction was synthesized by in situ growth of Bi2S3 nanoparticles on Ti3C2Tx nanosheets and then mixed with poly-l-lactic acid (PLLA) powder to fabricate the Bi2S3/Ti3C2Tx-PLLA conduit. At the heterojunction interfaces, Ti3C2Tx with a more positive Fermi energy level could form interfacial potential difference with Bi2S3 to promote electron–hole pair separation. Meanwhile, Ti3C2Tx with excellent conductivity could provide channels for photogenerated electron transmission, thus facilitating the generation of the photocurrent. Photoluminescence and electrochemical impedance spectroscopy analysis indicated that electron–hole pair separation and electron transfer were enhanced. As a consequence, under near-infrared light radiation, the output photocurrent of Bi2S3/Ti3C2Tx-PLLA was increased from 0.48 to 1.43 μA compared to that of Bi2S3-PLLA. The enhanced photocurrent effectively promoted the differentiation of rat pheochromocytoma (PC12) into functional neurons by upregulating extracellular Ca2+ influx. Therefore, the above results demonstrated that this work provided a new perspective for wireless electrical stimulated nerve regeneration.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Xiangbo Feng,Lvwei Sun,Wei Wang,Yuzhen Zhao,Jian-Wen Shi
Photoelectrochemical (PEC) water splitting provides a promising strategy for the production of clean hydrogen fuel. Herein, a new CdS@ZnO core–shell nanorod arrays (NRAs) is successfully constructed by atomic layer deposition (ALD) for H 2 evolution from PEC water splitting. The CdS@ZnO 200 obtained after 200 ALD cycles presents a significantly enhanced PEC H 2 evolution rate of 21.64 μmol·h −1 ·cm −2 , which is about 9.4 times of pristine CdS NRAs (2.31 μmol·h −1 ·cm −2 ). The reasons for the improved PEC H 2 evolution performance can be ascribed to several aspects: firstly, the Z-scheme charge transfer mechanism formed between CdS core and ZnO shell promotes the effective spatial separation of photo-induced electrons and holes; secondly, the close contact between the two semiconductors resulted from ALD process helps to reduce the transfer resistance of charge carriers. In addition, the CdS core is tightly wrapped by ZnO shell, which helps to prevent the photo-corrosion of CdS core. This work provides a new type of photoanode material suitable for PEC H 2 evolution from water splitting, and provides an efficient anti-corrosion method for the use of photocorrosive semiconductor materials.
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Catalysts
·
2023
·Vol. 13
·期 7
·1064
·
IF 3.9
Yutong Ye,Guorong Zhou,Kaixun Li,Yun Tong
Anion modification and trace metal doping have been widely demonstrated to have unique advantages in regulating both electrocatalytic activity and the electronic structure of non-precious metal materials. Developing a simple and practical preparation strategy is critical, but it still faces challenges. In this paper, a novel type of dual-modification approach is put forward to rationally design the S, Pt-CoNi material, which can be grown directly on the nickel foam (NF) in a one-step electrodeposition process. The multiple advantages of having plenty of active sites, high conductivity, and a faster charge transfer endow the optimized reaction kinetic for HER. The prepared S, Pt-CoNi/NF catalyst displays excellent catalytic performance, and a low overpotential of 116 mV at 50 mA cm−2and a small Tafel slope of 75 mV dec−1are achieved. The coupled S, Pt-CoNi/NF||FeOOH/NF electrolyzer delivers a high current density of 100 mA cm−2at the potential of 1.61 V as well as superior stability under alkaline conditions. Our work experimentally confirms the feasibility of constructing a dual-regulation strategy via one-step electrodeposition, and it also provides ideas for the controllable design of other high-performance electrodes for electrocatalysis.Keywords:dual-modification;CoNi alloy;electrodeposition;electrocatalytic hydrogen production;alkaline medium
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MICROCHIMICA ACTA
·
2023
·Vol. 190
·期 7
·1-11
·
IF 5.7
Li Yuchen,Xu Guangfu,Chen Jiaquan,Yu Tao,Miao Pandeng,Du Yingxiang
A novel chiral molecularly imprinted polymer TiO 2 nanoparticle was synthesized in one step for the enantioseparation of phenylalanine in coated capillary electrochromatography. To the author’s knowledge, the chiral molecularly imprinted nanomaterials have still not been reported, to date. Chiral molecularly imprinted TiO 2 nanomaterials (L-PHE@MIP(APTES-TEOS)@TiO 2 ) were used as a chiral stationary phase to separate the phenylalanine enantiomers in coated capillary electrochromatography (CEC). The imprinted coating was prepared from L-phenylalanine (L-PHE) as the template, TiO 2 nanoparticles (NPs) as the support substrate, 3-aminopropyltriethoxysilane (APTES) as the functional monomer, and tetraethyl silicate (TEOS) as the cross-linker. Scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS) were used for the characterization of the L-PHE@MIP(APTES-TEOS)@TiO 2 @capillary. Fourier transform infrared spectra (FT-IR), transmission electron microscopy (TEM), and thermogravimetric analysis (TGA) were employed for the characterization of the L-PHE@MIP(APTES-TEOS)@TiO 2 . The effects of the applied voltage, pH value, buffer concentration, and acetonitrile content were investigated experimentally to determine the optimum conditions for CEC. The best resolution for phenylalanine enantiomers by CEC reached a value of 3.48. In addition, the specific recognition effect of L-PHE@MIP(APTES-TEOS)@TiO 2 on PHE enantiomers was studied by selective experiment. Finally, adsorption kinetic research, adsorption equilibrium isotherm study, and adsorption thermodynamic experiment were carried out to investigate the separation mechanism of PHE enantiomers with the L-PHE@MIP (APTES-TEOS)@TiO 2 @capillary, and the results were consistent with those of CEC experiments. Graphical Abstract
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Small
·
2023
·Vol. 19
·期 37
·2300841
·
IF 13.3
Yuhan Wang,Jin Wang,Meng Zhang,Song Zheng,Jiahui Wu,Tianren Zheng,Guocan Jiang,Zhengquan Li
Perovskite nanocrystals (PNCs) are promising candidates for solar-to-fuel conversions yet exhibit low photocatalytic activities mainly due to serious recombination of photogenerated charge carriers. Constructing heterojunction is regarded as an effective method to promote the separation of charge carriers in PNCs. However, the low interfacial quality and non-directional charge transfer in heterojunction lead to low charge transfer efficiency. Herein, a CsPbBr 3 –CdZnS heterojunction is designed and prepared via an in situ hot-injection method for photocatalytic CO 2 reduction. It is found that the high-quality interface in heterojunction and anisotropic charge transfer of CdZnS nanorods (NRs) enable efficient spatial separation of charge carriers in CsPbBr 3 –CdZnS heterojunction. The CsPbBr 3 –CdZnS heterojunction achieves a higher CO yield (55.8 µmol g −1 h −1 ) than that of the pristine CsPbBr 3 NCs (13.9 µmol g −1 h −1 ). Furthermore, spectroscopic experiments and density functional theory (DFT) simulations further confirm that the suppressed recombination of charge carriers and lowered energy barrier for CO 2 reduction contribute to the improved photocatalytic activity of the CsPbBr 3 –CdZnS heterojunction. This work demonstrates a valid method to construct high-quality heterojunction with directional charge transfer for photocatalytic CO 2 reduction. This study is expected to pave a new avenue to design perovskite–chalcogenide heterojunction.
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Surfaces and Interfaces
·
2023
·
IF 6.2
Qin Lei,Jiaxin Li,Junjie Lei,Bo Hong,Xiaoling Li,He Li,Yiwen Wan
In this study, a simple wet chemical method was used to prepare p-n heterojunction photoelectric composites (Bi 2 S 3 @g-C 3 N 4 ). The p-n junctions were formed to facilitate charge transfer as well as strongly suppress electron-hole pair recombination, thus enhancing the photoelectrochemical (PEC) characteristics. Particularly, according to the transient surface photocurrent response, the photocurrent intensity of the prepared composites was 2.98 times higher relative to the pristine g-C 3 N 4 material. The photocurrent signal revealed the prepared novel PEC sensor composed of Bi 2 S 3 @g-C 3 N 4 composite material, which can be used for sensitively and selectively detecting chlorpyrifos. This method presented a linear change from 50 ng/mL to 0.1 mg/mL of chlorpyrifos under the optimal conditions. The linear regression equation was I(μA)=0.8546-0.1558lgC(mg/mL) (R 2 =0.9758) and the detection limit was 0.03 ng/mL (S/N=3). In addition, the novel sensing platform with high selectivity could assist in rapidly and effectively detecting chlorpyrifos in environmental analysis.
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ACS ES&T Water
·
2023
·
IF 5.3
Lijuan Wang,Jiawei Li,Gansheng Zhong,Jiangpeng Li,Xiao Lu,Siqing Wang,Yuanyuan Tang
To face the current critical challenges of gold recovery and beneficial utilization of solid waste, this study synthesized diatom biochar from the anoxic pyrolysis of diatoms and proved the superiority of the diatom biochar as a novel adsorbent for Au(III) in both synthetic and real electroplating wastewaters. The diatom biochar was found to have a high adsorption capacity of 443.0 mg/g and a superior recovery efficiency of up to 92.1%. The Au(III) adsorption kinetics followed the pseudo-second-order and intraparticle diffusion models. Electrostatic attraction and reduction were detected as the major adsorption mechanisms. An exceptional selectivity was also observed for the diatom biochar toward Au(III) with other coexisting heavy metals. Even in the presence of CN– in the solution, the diatom biochar still exhibited superiority in Au(III) adsorption. Owing to its high affinity to Au(III), the diatom biochar was successfully applied in real electroplating wastewater containing trace Au(III), with an adsorption efficiency as high as 96.7%. These findings sufficiently demonstrate the excellent performance and economic feasibility of diatoms for Au(III) recovery from electroplating wastewater, which also promoted solid waste minimization of diatom biorefineries.
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Biosensors-Basel
·
2023
·Vol. 13
·期 5
·506
·
IF 5.4
Yaofei Chen,Xin Xiong,Yu Chen,Lei Chen,Guishi Liu,Wei Xiao,Jifu Shi,Zhe Chen,Yunhan Luo
Surface plasmon resonance (SPR) based sensors play an important role in the biological and medical fields, and improving the sensitivity is a goal that has always been pursued. In this paper, a sensitivity enhancement scheme jointly employing MoS2nanoflower (MNF) and nanodiamond (ND) to co-engineer the plasmonic surface was proposed and demonstrated. The scheme could be easily implemented via physically depositing MNF and ND overlayers on the gold surface of an SPR chip, and the overlayer could be flexibly adjusted by controlling the deposition times, thus approaching the optimal performance. The bulk RI sensitivity was enhanced from 9682 to 12,219 nm/RIU under the optimal condition that successively deposited MNF and ND 1 and 2 times. The proposed scheme was proved in an IgG immunoassay, where the sensitivity was twice enhanced compared to the traditional bare gold surface. Characterization and simulation results revealed that the improvement arose from the enhanced sensing field and increased antibody loading via the deposited MNF and ND overlayer. At the same time, the versatile surface property of NDs allowed a specifically-functionalized sensor using the standard method compatible with a gold surface. Besides, the application for pseudorabies virus detection in serum solution was also demonstrated.Keywords:SPR-based biosensor;MoS2nanoflowers;Nanodiamonds;surface engineering;sensitivity enhancement
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Nanoscale
·
2023
·Vol. 15
·期 20
·9049-9059
·
IF 6.7
Xiaolong Deng,Shanshan Wang,Yi Liu,Jiafeng Cao,Jinzhao Huang,Xingwei Shi
In this study, a hierarchical interconnected porous metal sulfide heterostructure was synthesized from CoFeAl layered double hydroxides (LDHs) by a two-step hydrothermal process (sulfidation and a NaOH etching process). Among the as-made samples, the CoFeAl-T-NaOH electrode exhibited excellent oxygen and hydrogen evolution reaction catalytic activities with overpotentials of 344 mV and 197 mV at the current density of 100 mA cm−2, respectively. Meanwhile, small Tafel slopes of 57.7 mV dec−1 and 106.5 mV dec−1 for water oxidation and hydrogen evolution were observed for the CoFeAl-T-NaOH, respectively. Serving as both the cathode and anode for overall water splitting, the CoFeAl-T-NaOH electrode reached a current density of 10 mA cm−2 at a cell voltage of 1.65 V with excellent stability. The enhanced electrocatalytic activity could be attributed to: the hierarchical interconnected nanosheet structure facilitating mass transport; the porous structure promoting electrolyte infiltration and reactant transfer; the heterojunction accelerating charge transfer; and the synergistic effect between them. This study offered a new clue for in situ synthesizing porous transition-metal based heterojunction electrocatalysts with a careful tuning of the sequence of sulfuration and alkaline etching to enhance the electrocatalytic performance.
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INORGANIC CHEMISTRY
·
2023
·
IF 4.6
Dan Li,Jiahui Yang,Shuang Lv,Xiaopeng Li,Li Shao,Caiyun Zhou,Feigao Xu
Unique Fe3S4/Cu2O composites were constructed with high Fenton-like photocatalytic activity through the impregnation coprecipitation method. The structure, morphology, optical, magnetic, and photocatalytic properties of the as-prepared composites were explored in detail. The findings suggest that small Cu2O particles were grown on the surface of Fe3S4. The removal efficiency of TCH by Fe3S4/Cu2O was 65.7, 4.75, and 3.67 times higher than that of pure Fe3S4, Cu2O, and the Fe3S4 + Cu2O mixture, respectively, when the mass ratio of Fe3S4 and Cu2O was 1:1 at pH 7.2. The synergistic effect between Cu2O and Fe3S4 was the main factor for TCH degradation. The Cu+ species from Cu2O increased the Fe3+/Fe2+ cycle during the Fenton reaction. •O2– and h+ were the main active radicals; however, •OH and e– played the second role in the photocatalytic degradation reaction. Moreover, the Fe3S4/Cu2O composite retained good recyclability and versatility, and could be conveniently separated by a magnet.
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Nano Energy
·
2023
·
IF 17.6
Shule Huang,Gui Wang,Xinmiao Xuan,Moran Qin,Jieming Huang,Lirong Wang,Xiaoming Zhang,Nan Wang,Junwei Zhang,Zhipeng Hou,Xingsen Gao,Zhang Zhang,Junming Liu
Piezoelectricity in 2D transition metal dichalcogenides (TMDs) has gathered significant interest due to their massive exposure of unsaturated edge sites and high piezoelectric modulus. Nevertheless, the piezoelectricity in 1 T′ phase TMDs is inhibited by its center symmetry of space group. Herein, to break the shackles of piezoelectric polarization, we synthesize a piezoelectric material composed of an atomic molybdenum array bound to distorted 1 T′ ReS 2 (MDR). The phase transition from 1 T′ to distorted 1 T′ (D-1 T′) removes the special Peierl's distortion of ReS 2 , breaking its center symmetry and allowing for piezoelectric generation. Remarkably, MDR exhibits a large piezoelectric coefficient ( d 33 ) value of 15.45 pm/V, which is an order of magnitude higher than those reported in other TMDs. Combining with excellent piezocatalytic activity, a 0D/3D di-piezoelectric porous electret featuring an enhanced quantum confinement piezoelectric effect based on the MDR quantum dots (QDs) and inverse opal g-C 3 N 4 (IOCN) is demonstrated for high-efficiency piezoelectric catalysis.
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Journal of Environmental Chemical Engineering
·
2023
·
IF 7.7
Lulu Zhang,Long Jiang,Yaojie Liu,Zongjiang Yu,Ximin Chen,Xiaomeng Su,Mo Xian,Weizhi Sun,Chao Xu
Currently searching for effective noble metal separation material is generally blind and time-consuming. Although theoretical calculation has been widely applied to explain the adsorption mechanism, the quantitative coordination effect between ligand and metal remains to be explored especially in the material screening stage. In this study, Pearson’s theory and Koopmans' theory were used to calculate the electron transfer ratio (ΔN) from different ligands containing N, S, and O to PdCl 2 . The quantitative evaluation contributed to the design of efficient ligands including EA (ΔN =0.5929), DB (ΔN =0.5483), and AT (ΔN =0.4885). And the corresponding polystyrene materials CMPS-EA, CMPS-AT, CMPS-DB were successfully synthesized via chemical modification. According to the adsorption experiment, the per mmol of ligand adsorption capacity from CMPS-EA, CMPS-DB and CMPS-AT for Pd(II) were 0.67 mmol/mmol, 0.17 mmol/mmol and 0.11 mmol/mmol, respectively, exhibiting a positive correlation with the results of ΔN. Moreover, CMPS-EA could efficiently remove 98.01% Pd(II) in the presence of multiple competing metal ions with five times concentration higher than Pd(II). In column study, the breakthrough point (C t /C 0 =0.05) for CMPS-EA was 666–676 BV in 1 mmol/L Pd(II) solution and up to 95% desorption efficiency within 50 BV. The adsorption differences and mechanism of CMPS-EA, CMPS-AT and CMPS-DB were further investigated by FTIR, XPS, ESP, and NBO.
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