Battery Energy
·
2024
·
IF 9
Xiangchao Xu,Fen Qiao,Yanzhen Liu,Wenjie Liu
Cu(OH) 2 has the advantages of ease of structural regulation, good conductivity, and relatively low cost, making it a suitable candidate material for use as an electrocatalyst. However, its catalytic efficiency and stability still need to be improved further. Therefore, Cu(OH) 2 /Cu 2 S was successfully prepared on copper foam (CF) using the in situ growth and hydrothermal method. The structural characterization showed that sulfidation treatment induced transformation of Cu(OH) 2 /CF from smooth nanorods into a coral-like structure, which exposed more active sites of Cu(OH) 2 /Cu 2 S and enhanced the performance of electrocatalytic hydrogen evolution reaction (HER). Compared with Cu(OH) 2 , Cu(OH) 2 /Cu 2 S showed better alkaline HER performance, especially when the vulcanization concentration was 0.1 M, the overpotential of Cu(OH) 2 /Cu 2 S was 174 mV, and the reaction kinetics was 64 mv dec −1 at a current density of 10 mA cm −2 . In this work, the morphology and electronic structure of copper-based metal sulfide electrocatalysts were adjusted by sulfide treatment, which provided a new reference for improving HER performance.
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Nanomaterials
·
2022
·Vol. 12
·期 21
·3844
·
IF 5.719
Zhenlan Xu,Qing Tang,Aimei Hong,Lingxiangyu Li
Along with the development of nanotechnology, nanomaterials have been gradually applied to agriculture in recent years, such as Cu(OH)2-nanorods-based nanopesticide, an antibacterial agrochemical with a high efficacy. Nevertheless, knowledge about physical stability of Cu(OH)2nanopesticide in soil solutions is currently scarce, restricting comprehensive understanding of the fate and risk of Cu(OH)2nanopesticide in the soil environment. Herein we investigated aggregation, sedimentation and dissolution of Cu(OH)2nanopesticide in soil solutions extracted from three different soil samples, wherein commercial Cu(OH)2nanopesticide formulation (NPF), as well as its active ingredient (AI) and laboratory-prepared Cu(OH)2nanorods (NR) with similar morphology as AI, were used as model Cu(OH)2nanopesticides. We found that NPF compared to AI showed less extents of aggregation in ultrapure water due to the presence of dispersing agent in NPF. Yet, moderated aggregation and sedimentation were observed for Cu(OH)2nanopesticide irrespective of NPF, AI or NR when soil solutions were used instead of ultrapure water. The sedimentation rate constants of AI and NPF were 0.023 min−1and 0.010 min−1in the ultrapure water, whereas the rate constants of 0.003–0.021 min−1and 0.002–0.007 min−1were observed for AI and NPF in soil solutions, respectively. Besides aggregation and sedimentation, dissolution of Cu(OH)2nanopesticide in soil solutions was highly dependent on soil type, wherein pH and organic matter played important roles in dissolution. Although the final concentrations of dissolved copper (1.08–1.37 mg/L) were comparable among different soil solutions incubating 48 mg/L of AI, NPF or NR for 96 h, a gradual increase followed by an equilibrium was only observed in the soil solution from acidic soil (pH 5.16) with the low content of organic matter (1.20 g/kg). This work would shed light on the fate of Cu(OH)2nanopesticide in the soil environment, which is necessary for risk assessment of the nanomaterials-based agrochemical.Keywords:soil solutions;aggregation;sedimentation;Cu(OH)2nanopesticide;dissolution
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JOURNAL OF POWER SOURCES
·
2020
·
IF 8.247
Zhenhua Ge,Bin Fu,Xing Li,Jinping Zhao,Bo Ma,Zhiqiang Luo,Yantao Chen
Electrochemical water splitting is a very prospective technique to obtain the green hydrogen fuel . The oxygen evolution reaction becomes a limitation owing to the multiple electron transfer process. Thereby, a lot of attention is paid on the development of noble-metal free electrocatalysts for boosting the water oxidation process . The heterostructure of Mn 3 O 4 nanoparticles on Cu(OH) 2 nanowire arrays is fabricated, which exhibits an electrocatalytic activity close to RuO 2 . Compared with the single (hydro)oxides, the largely improved performance of the heterostructure towards water oxidation can be attributed to the enhanced charge transfer by the electronic interaction across the interface and the increased active sites for the rational combination of different active species . This work can be valuable for highlighting the role of heterostructure in the design and development of novel transition metal-based electrocatalysts for water oxidation.
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LANGMUIR
·
2022
·
IF 4.331
Yibo Ao,Jinqing Ao,Ling Zhao,Liwei Hu,Fengsheng Qu,Biao Guo,Xue Liu
Cu(OH)2 nanomaterials are widely investigated for non-enzymatic glucose sensors due to their low-cost and excellent performance. Cu(OH)2 nanomaterials usually grow on substrates to form sensor electrodes. Reported works mainly focus on structure adjusting of the Cu(OH)2 nanostructures, while the optimization of substrates is still lacking. In the present work, directional porous Cu (DPC) was applied as the substrate for the growth of Cu(OH)2 nanograss (NG), and hierarchical structures of Cu(OH)2@DPC were prepared by alkaline oxidation. The morphology and microstructure evolution of the prepared hierarchical structures was investigated, and the non-enzymatic glucose sensing performance was evaluated. Cu(OH)2@DPC exhibits enhanced comprehensive non-enzymatic glucose sensing performance compared to the reported ones, which may benefit from both the effective adsorption of the Cu(OH)2 NG with a relatively high surface area and the high solute exchange of the DPC by a channel effect. This work provides new insights into the further improvement of the non-enzymatic glucose sensing performance of Cu(OH)2 nanostructures by optimizing the substrate structure.
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SENSORS
·
2019
·Vol. 19
·期 22
·5055
·
IF 3.031
Min Jiang,Peng Sun,Jie Zhao,Lihua Huo,Guofeng Cui
Flexible physiological medical devices have gradually spread to the lives of people, especially the elderly. Here, a flexible integrated sensor based on Au nanoparticle modified copper hydroxide nanograss arrays on flexible carbon fiber cloth ([email protected](OH)2/CFC) is fabricated by a facile electrochemical method. The sensor possesses ultrahigh sensitivity of 7.35 mA mM−1cm−2in the linear concentration range of 0.10 to 3.30 mM and an ultralow detection limit down to 26.97 nM. The fantastic sensing properties can be ascribed to the collective effect of the superior electrochemical catalytic activity of nanograss arrays with dramatically enhanced electrochemically active surface area as well as mass transfer ability when modified with Au and intimate contact between the active material ([email protected](OH)2) and current collector (CFC), concurrently supplying good conductivity for electron/ion transport during glucose biosensing. Furthermore, the device also exhibits excellent anti-interference and stability for glucose detection. Owing to the distinguished performances, the novel sensor shows extreme reliability for practical glucose testing in human serum and juice samples. Significantly, these unique properties and the soft structure of silk fabric can provide a promising structure design for a flexible micro-device and a great potential material candidate of electrochemical glucose sensor.Keywords:Cu(OH)2nanograss;Au nanoparticles;glucose detection;flexible electrochemical biosensor
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Nano Research
·
2024
·Vol. 17
·期 6
·4898-4907
·
IF 9.5
Geng Jing,Ji Sihan
Electrocatalytic nitrate ( \({\rm{N}}{{\rm{O}}_3}^ -\) ) reduction to ammonia (NH 3 ) offers a viable approach for sustainable NH 3 production and environmental denitrification. Copper (Cu) possesses a distinctive electronic structure, which can augment the reaction kinetics of \({\rm{N}}{{\rm{O}}_3}^ -\) and impede hydrogen evolution reaction (HER), rendering it a promising contender for the electrosynthesis of NH 3 from \({\rm{N}}{{\rm{O}}_3}^ -\) . Nevertheless, the role of Cu 2 O in copper-based catalysts still requires further investigation for a more comprehensive understanding. Herein, the Cu 2 O/Cu(OH) 2 heterostructures are successfully fabricated through liquid laser irradiation using CuO nanoparticles as a precursor. Experimental and theoretical researches reveal that Cu 2 O/Cu(OH) 2 heterostructure exhibits enhanced electrocatalytic performance for \({\rm{N}}{{\rm{O}}_3}^ -\) to NH 3 because Cu(OH) 2 promotes electron transfer and reduces the valence state of Cu active site in Cu 2 O. At −0.6 V (vs. reversible hydrogen electrode (RHE)), the NH 3 yield reaches its maximum at 1630.66 ± 29.72 \({\rm{\mu g}} \cdot {{\rm{h}}^{ - 1}} \cdot {\rm{m}}{{\rm{g}}_{{\rm{cat}}}}^{ - 1}\) , while the maximum of Faraday efficiency (FE) is 76.95% ± 5.51%. This study expands the technical scope of copper-based catalyst preparation and enhances the understanding of the electrocatalytic mechanism of \({\rm{N}}{{\rm{O}}_3}^ -\) to NH 3 .
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NANOTECHNOLOGY
·
2020
·Vol. 31
·期 32
·325502
·
IF 3.551
Nianfeng Shi,Shupei Sun,Bo Zhang,Qian Du,Yanxin Liao,Xiaoming Liao,Guangfu Yin,Zhongbing Huang,Ximing Pu,Xianchun Chen
Co(OH)2 nanosheets/Cu(OH)2 nanorods composite electrodes for non-enzymatic glucose detection were fabricated by electrodepositing Co(OH)2 nanosheets on Cu(OH)2 nanorods substrate grown directly on the copper sheet via a simple one-step reaction. The Co(OH)2 nanosheets/Cu(OH)2 nanorods composite electrode was characterized by scanning electron microscopy, energy dispersive x-ray spectroscopy, x-ray diffraction and x-ray photoelectron spectroscopy. The glucose sensing performance of the composite electrode was investigated by cyclic voltammetry and chronoamperometry. The composite electrode shows high sensitivity of 2366 µA mM−1 cm−2 up to 2 mM with a lower detection limit of 0.17 mM (S/N = 3). The composite electrode is highly selective to glucose in the presence of various substances that always co-exist with glucose in real blood samples. The response of the composite towards human blood serum was in good agreement with that of commercially available glucose sensors, suggesting that a promising electrode material for highly sensitive and selective non enzymatic detection of glucose can be envisioned.
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CHINESE JOURNAL OF POLYMER SCIENCE
·
2018
·Vol. 36
·期 5
·612-619
·
IF 2.016
Wang Ye,Hu Ting-Ting,Han Xiao-Long,Wang Yu-Qi,Li Ji-Ding
Cu(OH) 2 nanowires were prepared and incorporated into poly(vinylidene fluoride) (PVDF) to fabricate Cu(OH) 2 -PVDF ultrafiltration (UF) membrane via immersion precipitation phase inversion process. The effect of Cu(OH) 2 nanowires on the morphology of membranes was investigated by X-ray photoelectron spectroscopy (XPS), Fourier transform infrared (FTIR) spectroscopy, atomic force microscopy (AFM), scanning electron microscopy (SEM) and X-ray diffraction (XRD) measurements. The results showed that all the Cu(OH) 2 -PVDF membranes had wider fingerlike pore structure and better hydrophilicity, smoother surface than pristine PVDF membrane due to the incorporation of Cu(OH) 2 nanowires. In addition, water flux and bovine serum albumin (BSA) rejection were also measured to investigate the filtration performance of membranes. The results indicated that all the Cu(OH) 2 -PVDF membranes had high water flux, outstanding BSA rejection and excellent antifouling properties. It is worth mentioning that the optimized performance could be obtained when the Cu(OH) 2 nanowires content reached 1.2 wt%. Furthermore, the membrane with 1.2 wt% Cu(OH) 2 nanowires showed outstanding oil-water emulsion separation capability.
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Carbon Letters
·
2023
·Vol. 33
·期 5
·1395-1406
·
IF 4.5
Chen Zhangjing,Li Liangliang,Cheng Gang
Photocatalytic CO 2 reduction is a promising approach for reducing CO 2 emissions and achieving the goal of carbon neutrality. In this work, selectively coupling Cu(OH) 2 and CuO with amine-modified brookite TiO 2 (NH 2 –B–TiO 2 ) has been achieved by a simple precipitation method. The results show that CuO is better than Cu(OH) 2 as a co-catalyst to enhance the CO 2 photoreduction capability of NH 2 –B–TiO 2 . The highest rates of CO 2 conversion to CH 4 and CO of NH 2 –B–TiO 2 –CuO composite reach 6.05 and 3.25 μmol h −1 g −1 , respectively, which is higher than 8 times the yield of CH 4 of NH 2 –B–TiO 2 . It is proposed that the NH 2 –B–TiO 2 –CuO composite offers an effective charge transfer through the formation of a p–n junction between NH 2 –B–TiO 2 and CuO interfaces, while in the NH 2 –B–TiO 2 –Cu(OH) 2 composite, the Cu(OH) 2 dominantly serves as an electron sink to capture photo-induced electrons, promoting photo-induced carrier separation. This work provides an ingenious synthetic method for selectively anchoring Cu(OH) 2 and CuO on semiconductors with different charge transfer routes for an efficient CO 2 photoreduction. Graphical abstract
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SCIENCE OF THE TOTAL ENVIRONMENT
·
2022
·
IF 10.753
Yingdong Chen,Rongze Sun,Wentao Yan,Mengyao Wu,Yong Zhou,CongJie Gao
In many important industries, such as the textile printing industry, a large amount of dye/salt wastewater is often discharged, which can destroy the ecological environment of the water body. Membrane technology has a great potential in the treatment of environmental problems caused by dye/salt wastewater. Polyvinyl alcohol (PVA) nanofiltration (NF) membrane has a bright future in dye/salt wastewater treatment , however, works on this are rare. Herein, antibacterial PVA NF membrane incorporated with Cu(OH) 2 nanowires for the dye/salt wastewater treatment is reported. The membrane was prepared via coating the solutions containing PVA, glutaraldehyde and Cu(OH) 2 nanowires on the polyethersulfone ultrafiltration membrane. Cu(OH) 2 nanowires has a diameter of 60 nm and was successfully introduced into the membrane. The introduction of nanowires improved the membrane hydrophilicity and roughness, which is conducive to the improvement of membrane flux. Membrane separation performance for one component solution and dye/salt solution were investigated. The introduction of Cu(OH) 2 increases the flux of the membrane obviously (the highest increase is 178.78% (from 21.49 to 38.42 L·m −2 ·h −1 ·bar −1 , for NaCl solution as the feed). Besides, the membrane doped with nanowires also possessed a high dye/salt selectivity . For one component solution, the dye removal rate was over 97.00% while the salt rejection was low (the lowest was 13.18% (NaCl)). For the dye/salt solution, the dye (Congo Red) rejection kept at a high level (98.91%) and the salt (NaCl) rejection was still low (13.71%), while the flux was also high (37.56 L·m −2 ·h −1 ·bar −1 ). The performance is superior to that of many membranes reported in previous works. Moreover, the Cu(OH) 2 nanowires endowed the membrane with an improved and high antibacterial property. The sterilization rate of Escherichia coli and Staphylococcus aureus reached more than 99.99%.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2026
·
IF 9.2
Hui-Hui Cao,Zhen-Hong He,Rui-Peng Yan,Xuanlu Fan,Weitao Wang,Kuan Wang,Huan Wang,Hui Ma,Xiaojuan Lai,Zhao-Tie Liu
Fe- and Cu-based catalysts are top candidates for the oxygen/hydrogen-evolution reactions, but their large-scale application is limited by rapid degradation under prolonged operation, especially at high current densities and high temperatures. Herein, a FeOOH/Cu(OH) 2 nanotube array grown on copper foil was designed for overall water-splitting. The structure enhances the electrochemical surface area, increases catalytic site density, and accelerates gas transport. DFT calculations confirms the Cu(OH) 2 and FeOOH synergy weakens HO–H bond, optimizing the ∗H adsorption energy, and driving reaction kinetics. In 1 M KOH, it achieves HER overpotentials of only 89 and 244 mV, and OER overpotentials of 124 and 424 mV at 10 and 100 mA cm −2 , respectively. Under industrial conditions (30% KOH, 65 °C), it sustains >2 A cm −2 for 100 h with negligible HER activity loss. This work provides a practical guide for designing high-activity, ultra-stable ampere-level water-splitting catalysts.
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CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Tao Luo,Yanan Yuan,Danna Zhou,Liting Luo,Jinjun Li,Feng Wu
In the recent years, sulfite-induced oxidation of various contaminants using oxysulfur radicals (SO 4 − , SO 5 − and SO 3 − ) has been explored to establish novel advanced oxidation processes (AOPs). Although transition metals, such as cupric ions (Cu(II)), have been demonstrated to be capable of activating sulfite (S(IV)), the catalytic mechanism of the specific Cu(II) species is still not very clear. In this work, N-acetyl- para -aminophenol (APAP) was used as a basic substrate to investigate the process, mechanism and stability of the Cu(II)-S(IV) system with low dosages of Cu(II) (0.010 mmol L −1 ) in an alkaline solution (pH 10). The results show that 0.010 mmol L −1 Cu(II) can efficiently activate S(IV) for the oxidation of APAP and other contaminants (e.g., metoprolol, sulfanilamide, aniline, 4-chloroaniline, N,N-dimethylaniline, p -nitrophenol and 3-nitrophenol). Simulation calculations for the distribution of the Cu(II) species and pH-dependence of APAP oxidation in the Cu(II)-S(IV) system showed that Cu(OH) 2 particles are the major active species in the catalysis of S(IV). The surface complexation of S(IV) with the Cu(OH) 2 particles prior to the production of oxysulfur radicals is the basic mechanism of the alkaline Cu(II)-S(IV) system. Radical inhibition with scavengers (ethanol, tert-butyl alcohol or aniline) demonstrates that SO 5 − , SO 4 − and hydroxyl radicals (HO ) are responsible for the contaminant oxidation. Moreover, SO 5 − is believed to be the main active species in the Cu(II)-S(IV) system, which has a second-order rate constant of 2.98 × 10 8 M −1 s −1 with APAP. This work renews our recognition of the Cu(II)-S(IV) system applications and further understanding of the catalytic role of the nascent Cu(OH) 2 particles in the activation of S(IV).
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