FUEL
·
2023
·
IF 7.4
Junfeng Qin,Qinghui Shen,Cuicui Du,Min Hong,Yixin Yang,Xiaohua Zhang,Jinhua Chen
Heteroatom doping and vacancy engineering play vital roles in designing a high-activity electrocatalyst . Herein, we proposed a novel enriched Se vacancies engineering of the promising ruthenium chalcogenide of RuSe 2 induced by low-valence Cu doping for promoting hydrogen evolution reaction (HER) electrocatalysis in alkaline media. The Cu-doped RuSe 2 with enriched Se vacancies supported on graphitized carbon (Cu-RuSe 2 @C) was synthesized by a simple one-step selenization of bimetallic MOF precursor of Ru/Cu-BTC (1,3,5-benzenetricarboxylic acid) polyhedra. Compared to the Cu(Ⅱ)-dominant doped RuSe 2 (Cu Ⅱ/Ⅰ -RuSe 2 @C) with deficient Se vacancies, the proposed Cu(Ⅰ)-dominant doped RuSe 2 (Cu Ⅰ/Ⅱ -RuSe 2 @C) with enriched Se vacancies exhibited significantly improved electrocatalytic activity, which was potentially derived from the created electron-deficient Ru δ+ and Se ν− sites induced by low-valence Cu doping. Specifically, Cu Ⅰ/Ⅱ -RuSe 2 @C needed only 40 mV overpotential to drive a HER current density of 10 mA cm −2 , comparable to commercial Pt/C (38 mV) and much lower than those of Cu Ⅱ/Ⅰ -RuSe 2 @C (93 mV) and RuSe 2 @C (362 mV). Furthermore, an alkaline Zn-H 2 O fuel cell with a Cu Ⅰ/Ⅱ -RuSe 2 @C cathode was integrated to demonstrate its potential applications, which delivered a maximum power density of 15.1 mW cm −2 and specific capacitance of 660 mAh g −1 with good stability. Two series-connected alkaline Zn-H 2 O cells acted as a chemical energy converter for simultaneous electricity generation and hydrogen coproduction by driving the coupled water splitting.
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Analytical Methods
·
2023
·Vol. 16
·期 5
·731-741
·
IF 3.1
Liyuan Yu,Mengxiao Lv,Ting Zhang,Qixin Zhou,Juanhua Zhang,Xuexiang Weng,Yongming Ruan,Jiuju Feng
Herein, we present a simple and mild method to in situ prepare CuO nanostructures for non-enzymatic glucose sensing. A Cu-metal organic framework (Cu-MOF) precursor was first directly grown on a pencil lead electrode with 3D graphene-like surfaces (EPLE) and then in situ transformed into CuO nanorods. The CuO nanorod-modified EPLE (CuO/EPLE) shows high sensitivity (1138.32 μA mM−1 cm−2), fast response time (1.5 s) and low detection limit (0.11 μM) for glucose oxidation. It has been found that NaOH promoted the generation of ˙OH groups and Cu(III) on the CuO surface, which then facilitated the electrochemical oxidation of glucose. Signals characteristic of hydroxyl and carbon-centered radical adducts were detected by EPR. Furthermore, the CuO/EPLE sensor also shows good accuracy in glucose determination in human serum samples.
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高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2021
·
IF 10.588
Jingwen Pan,Baoyu Gao,Pijun Duan,Kangying Guo,Xing Xu,Qinyan Yue
Herein, we attempted to apply an exhausted magnetic biochar with adsorbed Cu 2+ (Cu-Fe@BRC) directly as a PMS activator and explored the feasibility of this attempt. Density functional theory (DFT) and electrochemical analysis illuminated the adsorbed Cu 2+ in Cu-Fe@BRC improved PMS activation and NOR degradation efficiency by elevating the adsorption capacity of PMS and performance of electron transfer . About 91.47% of norfloxacin (NOR) was rapidly degraded in Cu-Fe@BRC/PMS system with low Fe and Cu leaching. An in-depth mechanistic study was conducted with radical scavenging, radical capturing and solvent exchange, which demonstrated that the adsorbed Cu 2+ could facilitate the formation of both different radicals and non-radical. Importantly, Cu-Fe@BRC can maintain a long-term stable operation and excellent catalytic performance in surface water treatment . The potential toxicity of by-product generated in the NOR degradation process was also predicated, and results suggested that most identified by-products were less toxic than NOR itself. Notably, the preparation cost of exhausted adsorbent-based catalysts could be negligible, so the expenditure of the corresponding oxidation process is reduced accordingly. Based on above, this work provides not only a low-cost exhausted biochar-based catalyst for water purification but also the insight into the PMS activation by adsorbed transition metal ions .
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高影响因子
PROGRESS IN ORGANIC COATINGS
·
2021
·
IF 5.161
Peng Xie,Yi He,Fei Zhong,Chen Zhang,Chunlin Chen,Hongjie Li,Yang Liu,Yang Bai,Jingyu Chen
Smart self-healing coatings with the active healing ability are the current research hotspot in the field of metal corrosion protection. In this work, we designed a novel corrosion protection system of waterborne epoxy. Under alkaline condition, Cu-BTA complexes were deposited on the surface of MoO 4 2− intercalated Mg-Al Layered double hydroxide (MIH) by electrostatic assembly as pH-sensitive gatekeepers. When MIH@Cu-BTA(MIHC) nanosheets were filled into the coatings, the layered structures of Layered double hydroxide(LDH) improved the barrier properties of the coatings to prevent corrosive ions penetration. Meanwhile, the excellent ion exchanges ability of LDH could be used to reduce the concentration of Cl- ions, both of MoO 4 2− ions and BTA could release quickly from MIHC in an acidic environment to achieve the self-healing effect. All of them cooperated to synergistically improve the anti-corrosion performance of the coating. The long-term protective performances and self-healing properties of WECs which loaded nano-containers were evaluated by salt spray test and electrochemical experiment. The impedance results indicate that the addition of MIHC(0.5 wt.%) increases the impedance of pure epoxy coating from 1.579 × 10 8 to 1.041 × 10 9 Ω cm 2 .
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Journal of the Taiwan Institute of Chemical Engineers
·
2021
·
IF 5.876
Wei Zhang,Ping Sun,Desheng Liu,Quanlin Zhao,Binze Zou,Lincheng Zhou,Zhengfang Ye
Herein, a simple and green method to fabricate β-cyclodextrin (β-CD) porous cross-linked polymer modified poly(chloromethylstyrene) (PS-Cl) resin, namely, PS@CM-CDP, for ultrafast and efficient removal of heavy metal ions and organic pollutants from aqueous solution was reported. The selected (PS-Cl) was used as a matrix; meanwhile, the β-CD was formed on the surface of PS-Cl under a rigid cross-linking agent of tetrafluoroterephthalonitrile nitrile. The structure and surface elements distribution of PS@CM-CDP were characterized using FT-IR, TG, SEM, XPS, and BET. The resultant PS@CM-CDP with a relatively high maximum adsorption capacity for Cu(II) and BPA can reach 121.88 and 8.25 mg g −1 , respectively, and the spherical nature of the resin makes conventional β-CD polymers easy to recycle 6 times without significantly decreased. The possible adsorption mechanism was also proposed. Industrial wastewater adsorption methods have been used into practice, and the practice presents considerable prospects in the aspects of column for water treatment.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2021
·
IF 8.128
Kai Peng,Weiqi Zhang,Narayanamoorthy Bhuvanendran,Qiang Ma,Qian Xu,Lei Xing,Lindiwe Khotseng,Huaneng Su
Pt-based alloy nanomaterials with nanodendrites (NDs) structures are efficient electrocatalysts for methanol oxidation reaction (MOR), however their durability is greatly limited by the issue of transition metals dissolution. In this work, a facile trace Ir-doping strategy was proposed to fabricate Ir-PtZn and Ir-PtCu alloy NDs catalysts in aqueous medium, which significantly improved the electrocatalytic activity and durability for MOR. The as-prepared Ir-PtZn/Cu NDs catalysts showed distinct dendrites structures with the averaged diameter of 4.1 nm, and trace Ir doping subsequently improved the utilization of Pt atoms and promoted the oxidation efficiency of methanol. The electrochemical characterizations further demonstrated that the obtained Ir-PtZn/Cu NDs possessed enhanced mass activities of nearly 1.23 and 1.28-fold higher than those of undoped PtZn and PtCu, and approximately 2.35 and 2.67-fold higher than that of Pt/C in acid medium. More excitingly, after long-term durability test, the proposed Ir-PtZn and Ir-PtCu NDs still retained about 88.9% and 91.6% of its initial mass activities, which further highlights the key role of Ir-doping in determining catalyst performance. This work suggests that trace Ir-doping engineering could be a promising way to develop advanced electrocatalysts toward MOR for direct methanol fuel cell (DMFC) applications.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2021
·
IF 4.539
Xiangke Han,Peng Li,Maowa Zhang,Jingtao Wang,Yijun Cao,Tong Zhang,Guoli Zhou,Fengli Li
The agglomeration of nanoscale carbon-based material with excellent large specific surface area and numerous active sites remains a challenging, which decreases the adsorption efficiency. Herein, a three-dimensional (3D) half-embedded architecture adsorbent membrane (ES-PAN/AHCNs) was designed to address this weakness by combining the small-sized activated hollow carbon nanospheres （AHCNs） with polyacrylonitrile (PAN) fiber. The 3D architecture precludes the agglomeration of AHCNs, while the half-embedded of AHCNs ensures structural stability of fiber adsorbents. The adsorption capacity and mechanism of ES-PAN/AHCNs membrane were investigated by using metal ions (Pb(Ⅱ), Cu(Ⅱ), Cr(Ⅲ)). Concretely, the adsorption capacity of ES-PAN/AHCNs membrane to Pb(Ⅱ), Cu(Ⅱ) and Cr(Ⅲ) were 192, 186 and 179 mg g −1 , respectively, which was more than two times than that of AHCNs. Noticeably, the significant increase of adsorption capacity mainly benefits from the 3D half-embedded architecture, owing to that pure PAN fiber has negligible adsorption capacity. Moreover, the adsorption capability of ES-PAN/AHCNs membrane retained 82.1% after twelve adsorption-desorption cycles. The strategy of fabricating 3D half-embedded adsorbent membrane substantially expands the potential for AHCNs applications in the adsorption and water purification fields.
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JOURNAL OF APPLIED TOXICOLOGY
·
2020
·Vol. 41
·期 5
·789-798
·
IF 2.997
Peide Zhu,Ting Zhang,Jianxiong Li,Junfei Ma,Xiangcheng Ouyang,Xuelin Zhao,Meng Xu,Deqing Wang,Quan Xu
Quantum dots (QDs) are luminescent semiconductor nanomaterials (NMs) with various biomedical applications, but the high toxicity associated with traditional QDs, such as Cd-based QDs, limits their uses in biomedicine. As such, the development of biocompatible metal-free QDs has gained extensive research interests. In this study, we synthesized near-infrared emission Cu, N-doped carbon dots (CDs) with optimal emission at 640 nm and a fluorescence quantum yield of 27.1% (in N , N -dimethylformamide [DMF]) by solvothermal method using o -phenylenediamine and copper acetate monohydrate. We thoroughly characterized the CDs and showed that they were highly fluorescent and stable under different conditions, although in highly acidic (pH = 1–2) or alkaline (pH = 12–13) solutions, a redshift or blueshift of fluorescence emission peak of Cu, N-doped CDs was also observed. When exposed to human umbilical vein endothelial cells (HUVECs), Cu, N-doped CDs only significantly induced cytotoxicity at very high concentrations (100 or 200 μg/ml), but their cytotoxicity appeared to be comparable with carbon black (CB) nanoparticles (NPs) at the same mass concentrations. As the mechanisms, 200 μg/ml Cu, N-doped CDs and CB NPs promoted endoplasmic reticulum (ER) stress proteins IRE1α and chop, leading to increased cleaved caspase 3/pro-caspase 3 ratio, but CB NPs were more effective. At noncytotoxic concentration (50 μg/ml), Cu, N-doped CDs successfully labeled HUVECs. In summary, we successfully prepared highly fluorescent and relatively biocompatible CDs to label HUVECs in vitro.
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高影响因子
Journal of Materials Chemistry C
·
2020
·Vol. 9
·期 1
·238-248
·
IF 7.059
Qigao Shang,Nannan Liu,Dan You,Qingrong Cheng,Guiying Liao,Zhiquan Pan
Two coordination polymers, {[Cu3(tib)4(NO3)4(H2O)]·2NO3·2.96H2O}n (1) and {[Ni(tib)2]·2NO3}n (2), were synthesized by a solvothermal reaction using a flexible tripodal ligand, 1,3,5-tris(imidazol-1-ylmethyl)benzene (TIB), and metal salts; the polymers were characterized by X-ray diffraction, Fourier transform infrared spectroscopy, thermogravimetric analysis, X-ray photoelectron spectroscopy and UV-vis diffuse reflectance spectra. The two complexes exhibited excellent active performance for photodegradation of tetracycline (TC) and photocatalytic hydrogen evolution under visible light. Control experiments revealed clearly that the pH value plays an important role in TC degradation, especially in alkaline solution; 93.21% of tetracycline was degraded by complex 1 within 60 min. In addition, using a Pt cocatalyst, the visible-light-driven photocatalytic H2 evolution rate of complex 2 reached 681.66 μmol h−1 g−1. Moreover, the photocatalysts can remain stable and retain high photocatalytic activity after several cycles of reuse. These MOF-based photocatalysts will provide new efforts for environmental purification and hydrogen evolution.
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高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2020
·
IF 3.807
Fuling Zhou,Chao You,Qiang Wang,Yilin Chen,Zhipeng Wang,Zuoping Zeng,Xuping Sun,Ke Huang,Xiaoli Xiong
A novel highly sensitive non-enzymatic glucose sensor is constructed based on an ultrafast synthesized amorphous NiCu-OH film coated Cu(OH) 2 nanorod array grown on copper foam (NiCu-OH@Cu(OH) 2 NRA/CF). The synthesized (NiCu-OH@Cu(OH) 2 NRA/CF) has abundant catalytic activity and good catalytic performance for the electrochemical detection of glucose in alkaline conditions. Sensitive and selective voltammetric detection of glucose is demonstrated. The linear range extends from 100 nM to 1.5 mM, the detection limit is 32 nM, and the sensitivity is 6560.3 μA mM -1 cm -2 . The method is applied to the determination of nitrite in human blood serum.
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APPLIED SURFACE SCIENCE
·
2020
·
IF 6.182
S.Y. Qian,Z.H. Xu,H.N. Xie,C.S. Shi,N.Q. Zhao,C.N. He,E.Z. Liu
We investigated the atomic and electronic structures and interface interaction of graphene/copper interface with rare earth elements (REEs) modified using density functional theory. The effect of interface interaction enhancement induced by interfacial modification is revealed, which results in significant improvement of the mechanical properties of graphene/copper. Thereby, we applied a novel strategy to incorporate Y element at the interface of graphene nanoplatelets/copper (GNPs/Cu) to improve mechanical properties of composites. Tensile tests demonstrated that the yield strength of composites increases by 95.4% via very low fraction (0.2 wt%) of Y modification with elongation comparable to Cu, which exhibits excellent matched relationship between strength and ductility. Simultaneously, the composite equips with improved electrical conductivity compared with that of the matrix. We illustrated the strengthening effects of REEs modification at the interface that give rise to the effective load transfer, in consistence with the theoretical predication. Furthermore, the GNPs/Cu composites with the interface Ce/Sc elements modified were also fabricated, both of which showed excellent strength-ductility combination. Therefore, the universality of the present method is verified for the preparation of metal matrix composites with excellent mechanical properties through interface modification with REEs.
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JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2020
·Vol. 167
·期 12
·127501
·
IF 3.721
Luo Wei,Ji-Hui Li,Chao Chen,Qian Lv,Ruitao Lv,Liqiang Ma,Wanci Shen,Feiyu Kang,Zheng-Hong Huang
The preparation of substrate with high specific surface area and conductivity is very important in the development of non-enzymatic glucose sensors. This study presents a non-enzymatic glucose sensor electrode based on a hybrid reduced graphene oxide (rGO) and carbonized silk fabric (CSF) substrate obtained by immersing silk fabric in a graphene oxide solution and carbonizing at 950 °C in an Ar atmosphere, and then decorating the rGO/CSF surface with Cu nanoflowers by electrodeposition. The optimum Cu-rGO/CSF sensor electrode exhibits high glucose sensitivities of 6613.3 μA mM−1 cm−2 and 1541.7 μA mM−1 cm−2 with linear responses over separate glucose concentration ranges of 0.05–4.0 mM and 4.0–7.0 mM due to the rGO/CSF substrate has high specific surface area, good conductivity and the Cu nanoflowers have high catalytic activity. The electrode also provides a lower limit of detection of 2.27 μM at a signal-to-noise ratio of 3 and high stability in the air. These results demonstrate that the proposed electrode material facilitates the development of simple and accurate non-enzymatic glucose sensors.
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