Journal of Materials Chemistry C
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2022
·Vol. 10
·期 35
·12602-12609
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IF 8.067
Chen Jia,Hongli Liu,Xiaoyuan Zhang,Shirong Wang,Xianggao Li
Self-powered photodetectors are great potential candidates in the next generation of low energy-consumption photoelectric devices. However, the planar-type metal–semiconductor–metal (MSM) self-powered photodetectors (PDs) of perovskites still suffer from poor photodetection performance. Herein, by taking advantage of the spontaneous polarization property of the CH3NH3PbI3 single crystal, which can generate an extra polarization electric field, planar-type self-powered Au/CH3NH3PbI3/Cu PDs with preferable photodetection capability is reported. The resultant PDs exhibit the maximum responsivity of 0.288 A W−1 in 400–840 nm under the superposed built-in electric field by spontaneous polarization and asymmetric Schottky junction. Furthermore, the maximum detectivity is 4.69 × 1012 Jones, which is the highest record among the planar-type MSM self-powered PDs based on a perovskite. Moreover, the PDs exhibited excellent operation stability with the photocurrent of the unencapsulated photodetector remaining at 92% after 15 days in atmospheric condition.
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NEW JOURNAL OF CHEMISTRY
·
2022
·Vol. 46
·期 36
·17223-17234
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IF 3.925
Dajie Zhang,Jiabao Sun,Qiang Li,Haocheng Song,Dongsheng Xia
Biochar emerged as a promising material due to its high efficiency and tunable physicochemical properties. In order to improve the economic applicability of biochar catalysts, we attempted to apply formed Cu-doped deactivated magnetic loofah biochar (Cu-Fe-LBC) as a peroxymonosulfate (PMS) activator to remove tetracycline (TC). The catalyst exhibited high activation of PMS and high stability with the TC removal of 97.6%. The chemical composition and groups on the catalyst surface confirmed the presence of copper ions on the biochar by complexation with COO–. Analysis of quenching experiments and electron paramagnetic resonance indicated the significance of HO˙ and 1O2 in TC degradation. The catalytic system had high catalytic efficiency with a wide pH range and coexisting anions. The possible degradation mechanism was proposed. Moreover, the research provides an insight into the PMS activation by reusing waste biochar catalysts.
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Journal of Energy Chemistry
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2022
·
IF 13.599
Wen Li Jia,Wen Jing Li,Hai Yang Yuan,Xuefeng Wu,Yuanwei Liu,Sheng Dai,Qilin Cheng,Peng Fei Liu,Hua Gui Yang
Surface modification by metal ion has been considered a promising strategy to enhance the photocatalytic activity by extending optical response and improving charge separation and transportation. Here, univalent copper species were modified on ZnIn 2 S 4 photocatalyst via an in-situ photodeposition method, exhibiting a much higher H 2 evolution rate of 41.10 ± 3.43 mmol g −1 h −1 and an impressive apparent quantum efficiency (AQE) of 20.81% at 420 ± 15 nm. Our characterizations indicate that the surface modification by copper species can broaden light utilization as well as promote charge separation and transportation. Besides, the density functional theory (DFT) results further exhibit that the energy levels (LUMO and HOMO) for copper-surface modified ZnIn 2 S 4 present spatial separation, locating on the Zn-S and In-S layers, respectively, which can suppress the recombination of electron and hole and thus achieves higher photocatalytic H 2 evolution efficiency.
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ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Jian Zhang,Zhipeng Liu,Hongshan Guo,Haoran Lin,Hao Wang,Xiao Liang,Hanlin Hu,Qibin Xia,Xiaoxin Zou,Xiaoxi Huang
Ethylene (C2H4) is an important product in carbon dioxide electroreduction (CO2RR) because of the essential role it plays in chemical industry. While several strategies have been proposed to tune the selectivity of Cu-based catalysts in order to achieve high C2H4 faradaic efficiency, maintaining high selectivity toward C2H4 in CO2RR remains an unresolved problem hampering the deployment of CO2 conversion technology due to the lack of stable electrocatalysts. Here, we develop a facile method to deposit a layer of Cu2O on Cu foil by an electrochemical pulsed potential treatment. This method is capable to easily scale up and synthesize multiple electrodes in one step. After the synthesis, the pulsed copper foil, denoted as P-Cu, exhibits good C2H4 faradaic efficiency of ∼50% in CO2RR at a potential around −1.0 V vs. RHE. The C2H4 selectivity is also found to be quantitatively correlated with the roughness factor (RF) of Cu-based catalysts. More importantly, for the first time, we demonstrate that the P-Cu electrode is quite durable in CO2RR to produce C2H4 for more than 6 months.
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JOURNAL OF POWER SOURCES
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2022
·
IF 9.794
Tong Dou,Jiawei Du,Jinqing He,Yiping Wang,Xuhui Zhao,Fazhi Zhang,Xiaodong Lei
The transformation of CO 2 into value-added products is a hot research topic. Metal copper as an electrochemical catalyst shows activity for generating multi-carbon products in CO 2 electroreduction. Herein, Cu 2 S nanorods/copper mesh (Cu 2 S/CM) is successfully fabricated, and exhibits high performance of CO 2 electroreduction to ethanol. At −0.8 V vs RHE , it achieved the Faraday efficiency (FE) of 13.5%, the partial current density of 13.3 mA cm −2 and the yield of 986.4 μmol L −1 h −1 for ethanol. Experiments and theoretical calculations indicated that the high performance is benefits from the high density of Cu 0 and Cu + pairs derived from Cu 2 S/CM during CO 2 electroreduction and an appropriate surface Cu 0 /Cu + ratio of 0.17. The Cu 0 –Cu + sites facilitate the adsorption of key intermediate *CH 2 CHO and decrease the energy barrier of the ethanol pathway. This work provides not only a new comprehension of CO 2 electroreduction with Cu 2 S catalyst but also a design idea based on Cu 0 –Cu + sites in Cu/Cu 2 S catalyst.
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CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Hongwei Yang,Fang Xu,Yulong Liao,Yong Ren,Guixiang Liu,Yan Yang,Xueying Wang,Bo Dai
In this work, we prepared a type of LiZnTiCu ferrite with a large grain size and enhanced magnetic properties at ∼900 °C by substituting Cu 2+ ions and doping LBSCA glass. Rietveld refinement of XRD patterns indicates that the Fe 3+ ions in B sites are partially replaced by the Cu 2+ ions, which causes the monotone increase of lattice constant . SEM results show that the interaction of CuO nanoparticles and LBSCA glass causes two changes in the grain growth of the LiZnTiCu ferrites. The grain growth is suppressed when the amount of CuO nanoparticles is less than a threshold value (x = 0.05 for 900 °C; x = 0.20 for 875 °C). However, when enough CuO nanoparticles are added, the ferrites possess a large and compact microstructure. The variation of magnetic hysteresis ( M - H ) loops confirms that M s follows the Néel's collinear spinel model with the increasing number of CuO nanoparticles (x ≤ 0.25). Finally, a type of LiZnTiCu ferrite (x = 0.15) with uniform large grains (average size >10 μm) and good magnetic parameters (4π M s = 3457.59 G, H c = 224.4 A/m and B s = 236.4 mT) is obtained at ∼900 °C.
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ADVANCED POWDER TECHNOLOGY
·
2022
·
IF 4.969
He Zhang,Jun-Ru Liu,Zhi-Bo Li,Xiao-Chun Deng,Guo-Hua Zhang,Kuo-Chih Chou
In this study, high-performance fine-grained W-Cu sintered blocks with the addition of dispersed Al 2 O 3 particles were successfully produced by low temperature liquid-phase sintering, using the raw material of ultrafine W-Cu alloy powder. The ultrafine W-Cu alloy powder was obtained by a two-step reduction process composed of stages of carbothermal reaction and hydrogen deep deoxidation. The fine Al 2 O 3 grains with uniform distribution in W-Cu alloy were introduced by spray method, leading to the decrease of W grain size and W-W connectivity. The relative densities of all sintered blocks were>97%, and a higher degree of densification ensures that the alloy has excellent comprehensive properties. With the increase of Al 2 O 3 content, W grain size and W-W connectivity of sintered W-Cu samples decrease from 664 nm to 472 nm and 0.2 to 0.14, respectively. The W-Cu alloy with the ultimate tensile strength of 415 MPa and the highest elongation of 7.22% was obtained when the addition amount of Al 2 O 3 was 0.5 wt%. At the same time, it also possessed the maximum bending strength of 1028 MPa and microhardness of 312 HV, respectively. In addition, due to the good network structure of Cu and uniform three-phase distribution, the sintered samples had excellent conductivity and compressive strength.
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COMPOSITE INTERFACES
·
2022
·
IF 2.839
Han He,Yehua Jiang,Juanjian Ru,Rong Zhou,Yixin Hua
The surface metallization of zirconia-toughened alumina (ZTA) particles with Ni–Cu bimetallic coatings is performed by electroless plating assisted with choline chloride–ethylene glycol (ChCl-EG) ionic liquid. The possible reactions and deposition sequences of the plating process have been analyzed based on the micro-morphologies of the Ni–Cu coated ZTA (ZTA@Ni–Cu) particles obtained at different reaction stages. The roles of ChCl-EG additive, reaction temperature, and ZTA concentration on the surface morphology, coating thickness, and element content of the ZTA@Ni–Cu particles are also investigated. Results show that uniform cauliflower-characteristic Ni–Cu coatings are formed on ZTA surfaces with 35 g·L−1 ChCl-EG at 65°C. The coating thickness is about 26.9 μm, and the element contents of Cu and Ni are 38.1 at% and 61.9 at%, respectively. Besides, a schematic illustration about the fabrication of ZTA@Ni–Cu particles is proposed to elaborate the formation process of Ni–Cu coatings and the function mechanism of ChCl-EG additive.
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JOURNAL OF SOLID STATE CHEMISTRY
·
2022
·
IF 3.656
Zhipeng Zhang,Feifei Li,Guoqiang Li,Rui Li,Yunfang Wang,Yawen Wang,Xiaochao Zhang,Lulu Zhang,Fangfang Li,Jianxin Liu,Caimei Fan
The bottlenecks of photocatalytic nitrogen fixation are adsorption and activation of nitrogen, because N–N bond in dinitrogen is one of the strongest bonds in chemistry . Herein, for the first time, Cu-doped MIL-101(Fe) was applications in photocatalytic nitrogen fixation. The photocatalytic nitrogen fixation activity of Cu-MIL-101(Fe) is three times that of MIL-101(Fe). Characteristic of MIL-101(Fe) and Cu-MIL-101(Fe) are systematically compared by XRD , SEM, TEM, BET, PL and energy band structure . These results indicated that the Cu doping not only enlarge the specific surface area from 1413 m 2 /g to 2097 m 2 /g, but also increase the photoreduction capability from −0.13 V to −0.7 V. These results indicated that nitrogen adsorption and activation capacity can be improved by Cu doping. By combining metal ions doping and components regulation of MOFs , this work provides many future opportunities for enhance photocatalytic nitrogen fixation activity.
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Frontiers in Chemistry
·
2022
·
IF 5.545
Han XiaoLe,Yu Fan,Lei JiaWen,Zhu Jiahua,Fu HaiYan,Hu JunCheng,Yang Xiao-Long
Water-soluble Cu-In-Zn-S quantum dots (CIZS QDs) with orange fluorescence have been synthesized with a glutathione (GSH) as stabilizer via facile a one-step hydrothermal method. The optimal reaction conditions of CIZS QDs including temperature, time, pH, and the molar ratios of precursors were studied. TEM results indicate that the aqueous-dispersible CIZS QDs are quasi-spherical, and the average diameters are 3.76 nm with excellent fluorescent stability. Furthermore, the cytotoxicity of CIZS QDs was investigated by the microcalorimetry combining with TEM and the IC50 was 10.2 μM. CIZS QDs showed a promising perspective in applications such as a fluorescent probe for bioimaging and biolabeling due to the low cytotoxicity and good biocompatibility. Moreover, the CIZS QDs can distinguish Pb2+ ion from other ions, offering great potentials in lead ion determination in drinking water. According to the results of UV, XRD, FL, PL, and ITC methods, the mechanism of CIZS QDs-Pb2+ assay is due to hydrogen bonding or van der Waals forces in the formation of Pb2+ and CIZS QDs.
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Journal of Physical Chemistry C
·
2021
·
IF 4.126
Shaopeng Qi,Guoning Liu,Jinxi Chen,Yongbing Lou,Yixin Zhao
The fast oxidation of plasmonic Cu nanomaterials caused by surface-absorbed oxygen has been a serious problem and has hindered their applications in many aspects. Herein, a lollipop-shaped Cu@Cu2O/ZnO heterojunction with a core–shell head and a rodlike stem was successfully prepared using the colloidal chemical method, which exhibits ultralong-term stability against air oxidation in hexane. The enhanced stability of Cu@Cu2O/ZnO was due to the presence of zinc acetate, which resulted in the crystal face reconstruction of Cu@Cu2O and the formation of a thin surface carboxylate coordination layer on the partial surface of Cu@Cu2O. The passivation layer effectively hindered the absorption of surface oxygen, thus reducing the oxidation rate of Cu. Our current work was expected to provide new insights into the protection of active metal nanostructures.
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ChemSusChem
·
2021
·Vol. 15
·期 1
·e202102010
·
IF 8.928
Han Zhang,Yu Yang,Yongxiang Liang,Jun Li,An Zhang,Han Zheng,Zhigang Geng,Fengwang Li,Jie Zeng
Graphical Lend me your EORs : Electrochemical oxidation-reduction (EOR) processing of a Cu-based metal-organic framework results in the formation of sub-nanometer Cu clusters that retains the organic linkers for highly selective and durable electrosynthesis of methane from the electrochemical CO 2 reduction reaction. Electrochemical CO 2 methanation powered by renewable electricity provides a promising approach to utilizing CO 2 in the form of a high-energy-density, clean fuel. Cu nanoclusters have been predicted by theoretical calculations to improve methane selectivity. Direct electrochemical reduction of Cu-based metal-organic frameworks (MOFs) results in large-size Cu nanoparticles which favor multi-carbon products. This study concerns an electrochemical oxidation-reduction method to prepare Cu clusters from MOFs. The derived Cu clusters exhibit a faradaic efficiency of 51.2 % for CH 4 with a partial current density of >150 mA cm −2 . High-resolution microscopy, in situ X-ray absorption spectroscopy, in situ Raman spectroscopy, and a range of ex situ spectroscopies indicate that the distinctive CH 4 selectivity is due to the sub-nanometer size of the derived materials, as well as stabilization of the clusters by residual ligands of the pristine MOF. This work offers a new insight into steering product selectivity of Cu by an electrochemical processing method.
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