JOURNAL OF PHYSICAL CHEMISTRY B
·
2021
·
IF 2.991
Jinxia Wang,Xiangyue Liu,Hongwei Xie,Huayi Yin,Qiushi Song,Zhiqiang Ning
The magnetohydrodynamic (MHD) effect was usually used to improve the mass transport during electrodeposition in a solution electrolyte. Herein, we reported the effect of a magnetic field on the electrode process of Al electrodeposition in a [Emim]Cl-AlCl3 ionic liquid composed of pure ions. Under a uniform and perpendicular magnetic field to the Cu electrode plane, electrochemical impedance spectroscopy (EIS) of the circuit, the cyclic voltammetry (CV) curves, and the different capacitances at the potential of zero charge (PZC) were measured, and the electrodeposition of aluminum was carried out at a constant current density. The results indicated that a vertical magnetic field significantly reduced the resistance (activation energy) for charge transfer of electrochemical reduction of Al2Cl7–; meanwhile, the capacitance of an electric double layer (EDL) and the density of the electrodeposited aluminum layer were increased.
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ANALYTICA CHIMICA ACTA
·
2021
·
IF 6.558
Yanju Chen,Hui Wu,Siwenjie Qian,Xiaoping Yu,Huan Chen,Jian Wu
Heavy metal lead accumulation in the environment pollutes the ecology systems and further threatens the human health. It is necessary to develop a sensitive method to detect it. Here, we propose a highly sensitive lead detection method by combining DNAzyme and CRISPR system. Once the lead ion is recognized, the substrate chain of DNAzyme is cleaved to produce single strand DNA . The produced single strand DNA can be detected by Cas protein/guide RNA complex and further trigger the collateral cleavage effect of CRISPR system, which can indiscriminately cut short single strand DNA reporters. By this way, the detection signals can be greatly amplified. This method can detect lead ions as low as 0.48 nM. The sensitivity is higher than the DNAzyme method. Furthermore, the portable 3D printing device is designed to observe the fluorescent signals so the end-point detection results can be visualized by the naked eyes. The entire detection process can avoid using bulky and expensive instruments, which can promote on-site lead ion detection.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Junao Zhang,Xin Xie,Xi He,Xiangnan Gong,Xin Zhang,Anping Liu,Yingzhou Huang
Surface-enhanced Raman Spectroscopy (SERS) has emerged as a powerful and sensitive technique for the detection of various molecules, including gaseous analytes. However, the development of efficient, stable, and reusable SERS substrates for gaseous molecule remains a challenge. This work introduces a novel Cu-Ag@ZIF-8 film for SERS detection of gaseous molecule, which consists of Ag nanoparticles (AgNPs) core and ZIF-8 porous shell on Cu foils. With strong enhancement of electromagnetic field by AgNPs core and effective caption of gaseous molecule by ZIF-8 porous shell, this substrate exhibits good SERS performance of p-aminothiophenol (PATP) and 4-mercaptophenol (DP) gaseous molecules, whose limit of detection (LOD) could reach 9.12 × 10 −10 M and 9.91 × 10 −9 M, respectively. Furthermore, the detection of gaseous benzaldehyde diffused by oil paint is explored by this developed SERS substrate for application. To achieve accurate identification of harmful gaseous molecule in complex volatile organic compounds (VOC), the deep learning (DL) approach is performed based on SERS spectra obtained from this Cu-Ag@ZIF-8 film. Our results demonstrate that the identification of gaseous benzaldehyde in VOC diffused from commercial oil paint has a high accuracy at 97.7% with the help of ANN algorithms, which points out the Cu-Ag@ZIF-8 film has good performance and huge potential for SERS detection of gaseous molecule.
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POLYMER
·
2023
·
IF 4.6
Chaoji Xiong,Hao Wang,Zhengbiao Zhang,Kun Liang,Chunhua Wu,Wei Wu,Xiaoping Rao,Qian Chen
Recently the research on the materials for removal of heave metals is surging rapidly. Here we have studied four triazine-based sulfur-containing polymers with different linkers, namely PDT1, PDT2, EDT1, and EDT2. They have been successfully synthesized by the nucleophilic substitution reaction of cyanuric chloride with propane-1,3-dithiol ( PDT1 and PDT2 ) and ethane-1,2-dithiol ( EDT1 and EDT2 ) in different ratios. The physical and chemical properties of these polymers were characterized by scanning electron microscopy, energy dispersive spectroscopy , Fourier transform infrared spectroscopy , porous structure analysis and X-ray photoelectron spectroscopy. The optimized adsorption condition was established by examining dosing, co-existing substances, contact time, concentration, temperature and pH values. The adsorbing properties, which was mainly described by the pseudo-second-order kinetic and Langmuir isothermal model, indicated that the sorption of Hg 2+ was the chemical adsorption . The maximum Hg 2+ sorption capacities of PDT1 , PDT2 , EDT1 and EDT2 were 1440.97 mg g −1 , 715.99 mg g −1 , 237.87 mg g −1 and 181.48 mg g −1 , respectively. Thermodynamically, the adsorption of Hg 2+ by the adsorbent is a spontaneous process. Cyclic experiments demonstrated that all the adsorbents could be reused in five successive adsorption cycles without significant losses in performance. Our density functional theory calculations in combination with relevant experimental results revealed the coordination geometry of Hg and hence mercury-adsorbent chelation mechanism. These results suggested that triazine-based sulfur-containing polymers could be utilized as effective adsorbents for the removal of Hg 2+ from polluted water.
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Coatings
·
2023
·Vol. 13
·期 11
·1963
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IF 3.4
Hongbin Wang,Rui Zhou,Huangping Yan,Hongjun Liu
In this work, 3D periodic “grid-type” CuO/Cu2O layers were fabricated on a copper sheet using laser processing techniques, and the laser processing parameters were optimized for favorable ZnO nanowire growth. It was found that ZnO nanowires could be successfully prepared to form a CuO-Cu2O-ZnO heterojunction structure without an extra catalyst or seed layer coating, which could be attributed to the copper oxide active sites induced via laser texturing. ZnO nanowires on laser textured “grid-type” copper substrates demonstrated an effective piezocatalytic performance with different morphologies and the generation of abundant reactive oxygen species in the CuO-Cu2O-ZnO catalytic system, providing a fundamental mechanism for the degradation of organic dye in water. This simple and low-cost method could provide a useful guide for the large-scale efficient and versatile synthesis of immobilized piezoelectric catalysts.Keywords:laser processing;ZnO heterojunction;piezocatalytic;wastewater treatment
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Journal of Energy Chemistry
·
2023
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IF 13.1
Yuxiang Yan,Yuxin Cao,Zhichao Wang,Ka Wang,Hengdong Ren,Shaoqi Zhang,Yi Wang,Jian Chen,Yong Zhou,Lizhe Liu,Jun Dai,Xinglong Wu
Rational design of efficient and robust earth-abundant alkaline hydrogen evolution reaction (HER) catalysts is a key factor for developing energy conversion technologies. Currently, antiperovskite nitride CuNMn 3 has garnered significant interest due to its remarkable properties such as negative/zero thermal expansion and magnetocaloric effects. However, when utilized as hydrogen evolution catalysts, it encounters large challenge resulting from excessively strong/weak interactions with adsorbed H on Mn/Cu active sites, which leads to low HER activity. In this study, we introduce an asymmetric orbital hybridization strategy in Zn-doped Cu 1− x Zn x NMn 3 by leveraging the localization of Zn electronic states to reconfigure the electronic structures of Cu and Mn, thereby reducing the energy barrier for water dissociation and optimizing Cu and Mn active sites for hydrogen adsorption and H 2 production. Electrochemical evaluations reveal that Cu 0.85 Zn 0.15 NMn 3 with x = 0.15 demonstrates exceptional electrocatalytic activity in alkaline electrolytes. A low overpotential of 52 mV at 10 mA cm −2 and outstanding stability over a 150-h test period are achieved, surpassing commercial Pt/C. This research offers a novel strategy for enhancing HER performance by modulating asymmetric hybridization of electron orbitals between multiple metal atoms within a material structure.
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Materials Today Communications
·
2023
·
IF 3.8
Zhen Zhang,Zhao Qin,Ming Zhang,Yifan Jiang,Chao Chen,Jiankan Zhang,Fengqi Zhao
The carbon dots (CDs) were prepared by the oxidation etching method. On this basis, the composite materials of CDs and Cu (CDs/Cu) were synthesized by the hydrothermal method . The elemental composition, morphology and structure were analyzed by TEM, SEM, EDS , XRD and XPS . The effects of CDs and CDs/Cu for thermal decomposition of TKX-50 pyrolysis were studied by DSC-FTIR-MS and in-situ solid FTIR . The CDs and CDs/Cu reduced the low-temperature decomposition peak temperature of TKX-50 by 10.1 ℃ and 16.1 ℃ respectively (10 ℃·min −1 ), and the second decomposition peak almost disappeared. This is because CDs and CDs/Cu can effectively facilitate the thermal decomposition of TKX-50 into NH 2 OH and 1,1′-ditetrazole diol (BTO). The CDs can promote the direct decomposition of BTO into small molecule gases and stable polymers at the initial pyrolysis stage. And they inhibit the combination of BTO and NH 3 into 5,5′-bistetrazole-1,1′-didiolate (ABTOX), which is more difficult to decompose. So, the HCN and N 2 /CO were increased obviously during pyrolysis while NH 3 and H 2 O content were decreased. On the other hand, the CDs/Cu promotes the decomposition of NH 2 OH in the first reaction. It manifested as the increase of NH 3 and H 2 O. At the same time, the CDs/Cu facilitates the transition of difficult to decompose ABTOX losing NH 3 to BOX to accelerate thermal decomposition reaction , playing a synergistic catalytic effect. Thus, in-situ solid FTIR signal of ABTOX was significantly weakened and the total content of NH 3 was raised, especially the significant expansion of NH 3 in the second stage. Finally, the influence of the catalysts in ignition characteristics was contrasted and discussed. Under the lower-power density region, the CDs and CDs/Cu decreased the ignition delay time of TKX-50. The CDs/Cu caused the flame propagation velocity of TKX-50 faster. Therefore, the CDs and their composites, as another new lightweight carbon material, are expected to be applied in the catalytic combustion of energetic materials.
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CHINESE JOURNAL OF CATALYSIS
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2023
·
IF 16.5
Hui Gao,Gong Zhang,Dongfang Cheng,Yongtao Wang,Jing Zhao,Xiaozhi Li,Xiaowei Du,Zhi-Jian Zhao,Tuo Wang,Peng Zhang,Jinlong Gong
Electrochemical CO 2 reduction is a sustainable method for producing multicarbon alcohols. However, the selectivity of alcohols is limited owing to the favorable side reaction to convert the key intermediate of *CH 2 CHO into ethylene. This study describes the design of a Cu electrocatalyst with abundant step sites to suppress the deoxygenation of *CH 2 CHO to ethylene, thereby promoting alcohol production. A Faradic efficiency of 40.5% and partial current density of 56.3 mA/cm 2 for alcohols are achieved. Moreover, the alcohols/C 2 H 4 ratio in the products reaches approximately 2.2. In-situ infrared spectrum characterizations and theoretical calculations reveal that the step sites facilitate C–C coupling and direct the reaction pathway to promote the formation of alcohols by inhibiting the cleavage of the C–O bond in *CH 2 CHO. Therefore, the proposed strategy is efficient for designing active sites to steer reaction pathways in CO 2 electroreductions and produce alcohols.
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CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Changcheng Cui,Junjie Fu,Dongxing Kou,Yimeng Li,Hao Wei,Zucheng Wu,Wenhui Zhou,Zhengji Zhou,Shengjie Yuan,Yafang Qi,Shuping Pang,Zhipeng Shao,Sixin Wu,Guanglei Cui
The Cu 2 ZnSn(S,Se) 4 solar cells (CZTSSe) are emerging as a hot area of low-cost thin film photovoltaic technology owing to its non-toxicity and excellent photoelectric properties. However, the large open-circuit voltage deficit ( V oc,deficit ) caused by the inherently defective CdS/ CZTSSe heterojunction interface is still a huge challenge for improving power conversion efficiency. Herein, we reconstruct the heterojunction interface by inserting a CZTSSe:In into the CdS/CZTSSe heterojunction through an In 2 Se 3 post-deposition treatment. The local occupation of In 3+ at Zn 2+ and Sn 4+ sites decreases the disordered Zn- and Sn-related deep defects and generates benign In Zn donors within CZITSSe transition layer simultaneously, which effectively enhances the surface p-to-n conversion. The combination of chemical and field-effect passivation regulates the charge extraction and passivates the charge recombination. As a result, the In element-buried absorber enables the V oc boost from 488 to 527 mV with an impressive active-area efficiency of 13.59 %. These results demonstrate the great potential of the In element-buried absorber in alleviating the V oc,deficit and enhancing the performance of CZTSSe solar cells.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Xing Yu,Jixiang Zhang,Nian Li,Yanping Song,Jun Kang,Shudong Zhang,Cui Liu,Zhao Li,Jingwen Pu,Na Hong,Min Xi,Zhenyang Wang
Combining of graphene with pseudocapacitance metal oxide is effective to construct supercapacitor electrode with high energy storage capacity. However, balancing the contradiction between high load of metal oxide and high stability of electrode is still challenging. Herein, a novel supercapacitor electrode composed of 3D graphene and manganese oxide is in-situ fabricated by laser carbonization of polyimide (PI) foam loaded with manganese acetate precursor. Due to the rich porous structure and super hygroscopicity of PI foam, high content manganese acetate is uniformly loaded into the network of PI foam. Under laser irradiation, PI foam is carbonized to form 3D porous graphene, while the generation of MnO-Mn 3 O 4 and its uniform loading on graphene is achieved synchronously. The obtained composite electrode exhibits a commercial-level mass loading up to 8 mg cm −2 , with a 48.6% weight ratio of MnO-Mn 3 O 4 . As a result, an ultra-high specific capacitance of 1525 mF cm −2 can be obtained for the composite electrode at the optimal doping concentration of 0.3 mol L − 1 . Notably, the composite electrode also exhibits excellent cycling stability of 94.75% retention rate after 6000 cycles. The maximum area specific capacitance of the micro supercapacitor with PVA/LiCl gel electrolyte is 410.19 mF cm −2 , the maximum energy density and power density are 82.04 μWh cm −2 and 400 μW cm −2 , respectively.
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Journal of the American Chemical Society
·
2023
·
IF 15
Zhi-Zheng Wu,Xiao-Long Zhang,Peng-Peng Yang,Zhuang-Zhuang Niu,Fei-Yue Gao,Yu-Cai Zhang,Li-Ping Chi,Shu-Ping Sun,Jing-Wen DuanMu,Pu-Gan Lu,Ye-Cheng Li,Min-Rui Gao
Carbon–carbon coupling electrochemistry on a conventional copper (Cu) catalyst still undergoes low selectivity among many different multicarbon (C2+) chemicals, posing a grand challenge to achieve a single C2+ product. Here, we demonstrate a laser irradiation synthesis of a gerhardtite mineral, Cu2(OH)3NO3, as a catalyst precursor to make a Cu catalyst with abundant stacking faults under reducing conditions. Such structural perturbation modulates electronic microenvironments of Cu, leading to improved d-electron back-donation to the antibonding orbital of *CO intermediates and thus strengthening *CO adsorption. With increased *CO coverage on the defect-rich Cu, we report an acetate selectivity of 56 ± 2% (compared to 31 ± 1% for conventional Cu) and a partial current density of 222 ± 7 mA per square centimeter in CO electroreduction. When run at 400 mA per square centimeter for 40 h in a flow reactor, this catalyst produces 68.3 mmol of acetate throughout. This work highlights the value of a Cu-containing mineral phase in accessing suitable structures for improved selectivity to a single desired C2+ product.
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ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Abubakar Yakubu Haruna,Yubo Luo,Zheng Ma,Wang Li,Haiqiang Liu,Xin Li,Qinghui Jiang,Junyou Yang
The thermoelectric performance of n-type Bi2Te3 needs further enhancement to match that of its p-type Bi2Te3 counterpart and should be considered for competitive applications. Combining Cu/Cl and multiscale additives (AgBiSe2) presents a suitable route for such enhancement. This is evidence of the enhanced thermoelectric performance of Bi1.995Cu0.005Te2.69Se0.33Cl0.03. Moreover, by incorporating 0.65 wt % AgBiSe2 (ABS) into Bi1.995Cu0.005Te2.69Se0.33Cl0.03, we further reduce its lattice thermal conductivity to ∼0.28 W m–1 K–1 at 353 K owing to the extra phonon scattering of multiscale ABS. Additionally, the Seebeck coefficient enhances (−183.89 μV K–1 at 353 K) owing to the matrix’s reduced carrier concentration caused by ABS. As a result, we achieve a high ZT of ∼1.25 (at 353 K) and a high ZTave of ∼1.12 at 300–433 K for Bi1.995Cu0.005Te2.69Se0.33Cl0.03 + 0.65 wt % ABS. This work provides a promising strategy for enhancing the thermoelectric performance of n-type Bi2Te3 through Cu/Cl doping and ABS incorporation.
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