Journal of Materials Chemistry A
·
2019
·Vol. 7
·期 37
·21232-21243
·
IF 10.733
Lechen Diao,Tao Yang,Biao Chen,Biao Zhang,Naiqin Zhao,Chunsheng Shi,Enzuo Liu,Liying Ma,Chunnian He
Developing highly efficient and low-cost bifunctional electrocatalysts towards the oxygen reduction reaction (ORR) is important for Zn–air batteries (ZABs) but still a challenge. In this work, electronic reconfiguration and structural optimization are simultaneously conducted to enhance the oxygen reduction reaction (ORR) electrocatalytic activity of Co2P nanoparticles, which were doped with Cu and confined within 2D ultrathin N,P-codoped carbon (NPC) nanosheets. Density functional theory calculations reveal that Cu doping can lead to more positive sites at the neighbouring Co site and weaken the binding force between the surface active sites and the adsorbed intermediates, while the 2D ultrathin nanosheets with Cu doped Co2P nanoparticles tightly anchored can remarkably boost the surface exposure of actives sites endowing such an architecture with efficient mass and charge transport pathways. As expected, the optimized Cu doped Co2P on 2D ultrathin N,P-codoped carbon (Cu-Co2P@2D-NPC) with 7.1% Cu doping exhibits a higher half-wave potential of 0.835 V than Pt/C (0.830 V). Meanwhile, flexible solid state ZABs assembled based on the 7.1%Cu-Co2P@2D-NPC hybrid deliver a high power density of 52.5 mW cm−2 and 32 h stability in the flat and folded states. This promising work holds significant potential to fabricate an efficient electrocatalyst for flexible solid state ZABs and further understand the relationship between the structure and activity.
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Journal of Materials Chemistry C
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2019
·Vol. 7
·期 23
·7061-7072
·
IF 6.641
Xiangying Meng,Songfang Zhao,Zhe Zhang,Ruliang Zhang,Jinhui Li,Jinfeng Leng,Duxia Cao,Guoping Zhang,Rong Sun
Recently, it has become highly desirable but remains a challenge to design strain-sensing materials with rational geometric structures that endow the strain sensors with high sensitivity, large stretchability and a broad sensing range simultaneously. Herein, core–shell Cu–Ag nanowires (NWs) with tunable morphology and oxidation-resistance are achieved by an effective galvanic replacement reaction between Cu NWs and Ag(NH3)2+ without any additional heating, stirring or reducing agent. When the mass ratio of Cu NWs to AgNO3 is 8 : 6, Cu–Ag NWs exhibit the best oxidation-resistance and electrical conductivity retention in harsh environments. Nacre-mimetic conductive composites are achieved by embedding porous conductive networks composed of Cu–Ag NWs/reduced graphene oxide (rGO) in a poly(styrene-block-butadiene-block-styrene) (SBS) matrix, enabling the process to be simple, energy-saving, and scalable. They can detect both tiny and large deformations with a wide sensing range (up to 374% strain), high sensitivity (a gauge factor up to 87 362), high break elongation (up to 660% strain), and excellent reliability and stability. This successful combination of huge sensing range and high sensitivity is attributed to the high stretchability of the SBS “mortar”, the hierarchical architecture and the synergistic effects of sensitive two-dimensional (2D) rGO, and the conductive stretchable one-dimensional (1D) Cu–Ag NW “brick”. In addition, the composites can be used as patterned conductive interconnects for light-emitting diodes.
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Polymers
·
2018
·Vol. 10
·期 12
·1393
·
IF 2.935
Jie Cao,Jianbei Zhang,Yuejun Zhu,Shanshan Wang,Xiujun Wang,Kaihe Lv
The pollution of water resources has become a worldwide concern. The primary pollutants including insoluble oil, toxic dyes, and heavy metal ions. Herein, we report a polymer adsorbent, named SPCT, to remove the above three contaminants from water simultaneously. The preparation process of SPCT contains two steps. Firstly, a hydrogel composed of sulfonated phenolic resin (SMP) and polyethyleneimine (PEI) was synthesized using glutaraldehyde (GA) as the crosslinking agent, and the product was named SPG. Then SPCT was prepared by the reaction between SPG and citric acid (CA) at 170 °C. SPCT exhibited an excellent performance for the removal of methylene blue (MB) and Cu(II) from aqueous solution. For a solution with a pollutant concentration of 50 mg L−1, a removal efficiency of above 90% could be obtained with a SPCT dosage of 0.2 g L−1for MB, or a SPCT dosage of 0.5 g L−1for Cu(II), respectively. SPCT also presented an interesting wettability. In air, it was both superhydrophilic and superoleophilic, and it was superoleophobic underwater. Therefore, SPCT could successfully separate oil-in-water emulsion with high separation efficiency and resistance to oil fouling. Additionally, SPCT was easily regenerated by using dilute HCl solution as an eluent. The outstanding performance of SPCT and the efficient, cost-effective preparation process highlight its potential for practical applications.Keywords:wastewater treatment;adsorption;emulsion separation;thermal crosslinking;superhydrophilicity
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PubMed
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2018
·
IF 5.667
Shiyu Xu,Xuejiao Dong,Siqi Chen,Yangyang Zhao,Guiye Shan,Yingchun Sun,Yanwei Chen,Yichun Liu
Creating high-index facet gold nanorods (Au NRs) is important for catalytic application. The high-index facet exhibits tremendously catalytic activity comparing with low-index facet. Herein, Cu 2+ ions were chosen to induce Au NRs to form high-index {200} facet. Firstly, Au/Cu NRs with high-index facets induce high-density charge distribution at local position, which led to the surface enhanced Raman scattering enhancement. Furthermore, the active electrons transfer from Au/Cu NRs to H 2 O 2 make them show peroxidase-like properties. The catalytic activity of Au/Cu NRs was confirmed by the oxidation of colorless 3,3′,5,5′-tetramethylbenzidine (TMB) to blue oxidized TMB (oxTMB) by H 2 O 2 . According to Michaelis-Menten equation, the catalytic activity of Au/Cu was higher than Au NRs by 4.5 times. Meanwhile, the oxTMB molecules may be deoxidized to TMB molecules by the antioxidant of ascorbic acids. On the basis of this phenomenon, the colorimetric determination of ascorbic acid in real samples (vitamin drink) was developed with a detection limit of 25 μM.
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CHEMISTRY OF MATERIALS
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2018
·
IF 9.89
Yecan Pi,Jun Guo,Qi Shao,Xiaoqing Huang
The design of efficient Ir-based catalyst for oxygen evolution reaction (OER) in acidic conditions is the key for realizing the commercialization of polymer electrolyte membrane technology. This study reports a class of highly porous Ir–Cu nanocrystals (P-IrCux NCs) through a facile chemical dealloying strategy. Featuring the increased active surface area and plenty of defects, the newly generated P-IrCux NCs are highly active and stable toward OER in acidic conditions. The optimized P-IrCu1.4 NCs exhibit the current density of 12.8 mA cm–2 at the potential of 1.55 V (vs RHE), presenting 3.5-fold improvement in mass activity and 1.8-fold improvement in specific activity over the pristine solid IrCu1.4 NCs (S-IrCu1.4 NCs). Moreover, the obtained P-IrCu1.4 NCs also show excellent OER stability with negligible potential shift after continuous electrolysis in 0.05 M H2SO4 for 10 h. Further analysis reveals that the coordinatively unsaturated atoms at defects result in the higher oxidation state of iridium, which promotes the optimized intrinsic activity of P-IrCux NCs. This work highlights a promising strategy to create three-dimensional porous Ir-based catalysts for enhancing OER electrocatalysis.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2018
·
IF 11.698
Xingyu Guo,Xiangqing Li,Lixia Qin,Shi-Zhao Kang,Guodong Li
Development of photocatalysts with high activity and durability for hydrogen generation is extremely desired but still remains a great challenge currently. With Cu nanoparticles (Cu NPs) as a linker between TiO 2 microsphere (TiO 2 MS) and 5, 10, 15, 20- meso -tetra(4-carboxyphenyl)porphyrin (TCPP), a novel nano-micro hybrid (TiO 2 MS-Cu-TCPP) was prepared via a facile method. By bridging TiO 2 MS and TCPP with Cu NPs, the absorption and the electron transfer of TiO 2 MS were greatly improved. When the TiO 2 MS-Cu-TCPP was employed as the photocatalyst for hydrogen evolution, it exhibited higher activity and stability than those of the TiO 2 MS, the TiO 2 MS-Cu and the TiO 2 MS-TCPP, TiO 2 MS-Cu-CuTCPP and TiO 2 MS-TCPP-Cu. The photocatalytic activity was enhanced for about 6 times with respect to that of the pristine TiO 2 MS. The excellent performance for the nano-micro hybrid can be attributed to wide light absorption, more reactive sites, and facilitated interfacial electron transfer owing to the strong interaction between TiO 2 and TCPP with Cu NPs as the linker and cocatalyst. Subsequently, a high and stable photocatalytic activity over the TiO 2 MS-Cu-TCPP nano-micro hybrid was achieved, demonstrating the importance of interfacial modification to a semiconductor photocatalyst. This result gives us a new perspective of constructing special structures for efficient light utilization and electron transfer.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2018
·
IF 4.229
Cong Wang,Hongli Wang,Zhili Wang,Xiaoju Li,Yue Chi,Minggang Wang,Dawei Gao,Zhankui Zhao
Ammonia borane (AB) has been identified as one of the most promising candidates for chemical hydrogen storage . However, the practical application of AB for hydrogen production is hindered by the need of efficient and inexpensive catalysts. For the first time, we report that the incorporation of Mo into Cu@Co core-shell structure can significantly improve the catalytic efficiency of hydrogen generation from the hydrolysis of AB. The Cu 0.81 @Mo 0.09 Co 0.10 core-shell catalyst displays high catalytic activity towards the hydrolysis dehydrogenation of AB with a turnover frequency (TOF) value of 49.6 molH 2 mol cat −1 min −1 , which is higher than most of Cu-based catalysts ever reported, and even comparable to those of noble-metal based catalysts. The excellent catalytic performance is attributed to the multi-elements co-deposition effect and electrons transfer effect of Cu, Mo and Co in the tri-metallic core-shell NPs.
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Journal of Materials Chemistry C
·
2012
·Vol. 1
·期 4
·751-756
·
IF 0
Yanyan Chen,Lijian Huang,Shenjie Li,Daocheng Pan
Water-soluble Cu+- and Ag+-doped ZnxCd1−xS quantum dots have been successfully synthesized via a facile and green method. All synthetic procedures were conducted in the open air at 95 °C. Hydrophilic glutathione was used as the capping agent. The influence of the dopant concentration in alloyed ZnxCd1−xS QDs has been investigated. The as-prepared Cu+- and Ag+-doped ZnxCd1−xS/ZnS core–shell quantum dots exhibit tunable emission covering the whole visible light region and the photoluminescence quantum yield (PL QY) can reach as high as 20% and 31%, respectively.
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NEW JOURNAL OF CHEMISTRY
·
2015
·Vol. 40
·期 1
·755-763
·
IF 3.086
Zhihong Zhang,Hongfei Ji,Shuai Zhang,Donglai Peng,Qixuan Fu,Minghua Wang,Linghao He,Lingyu Yue
We report a novel nanocomposite of hollow TiO2 microspheres and plasma polyacrylic acid (TiO2@PPAA) modified with rhodamine B (TiO2@PPAA-RhB). This nanocomposite was further used as an electrochemical sensor for the ultra-sensitive and selective detection of Cu2+ in water. A gold electrode was modified with hollow TiO2 nanospheres, followed by the closely bonded layer of PPAA via plasma polymerization. Subsequently, the carboxyl groups of TiO2@PPAA nanocomposites were activated to ester groups by N-hydroxysuccinimide/1-ethyl-3-(3-dimethylaminoprolyl) carbodiimide hydrochloride. The resultant activated ester groups reacted with the amino groups on rhodamine to form the amide groups, leading to the modification of TiO2@PPAA nanocomposites with rhodamine. Considering the synergistic effect of strong electrostatic interaction between the carboxyl groups of PPAA and Cu2+, the direct adsorption of Cu2+ on the TiO2 surface, and the coordination chemistry formed between Cu2+ and rhodamine, the developed electrochemical biosensor exhibited high sensitivity of Cu2+ detection, with a detection limit of 0.404 pM within the range of 0.001–10 nM of Cu2+. Therefore, the fabricated electrochemical sensor based on TiO2@PPAA-RhB can be obtained via plasma polymerization and represents a highly promising tool for use in environmental monitoring.
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APPLIED SURFACE SCIENCE
·
2015
·
IF 2.711
Jiyun Zheng,Guogang Shu,Wei Wang,Qiulin Li,Wei Liu
Surface quality improvement by Cu activation and oxidation roughening process was studied during electroless coating Cu on boron carbide (B 4 C) particles. The surface morphology was characterized by scanning electron microscope (SEM) and the phase identification was determined by X-ray diffraction (XRD) analysis. Two aspects concluding surface activation and surface roughening were investigated to understand the effect of each on Cu coating. Cu activation process increased surface activity of B 4 C by pre-deposition Cu nano-crystals, which was effective and cost-saving when compared with conventional Pd activation method. The influence of activation pH on electroless Cu coating was discussed and a moderate pH 12 is suitable for Cu deposition. Surface roughening process availably promoted wettability of B 4 C particles with aqueous solution. Etched pits were formed on B 4 C surface and resulted in fresh surface exposed after oxidization roughening process, which was beneficial for Cu bonding and coating on B 4 C surface.
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DALTON TRANSACTIONS
·
2015
·Vol. 44
·期 47
·20763-20768
·
IF 4.197
Lan Wang,Xiaojiao Kang,Lijian Huang,Daocheng Pan
We reported temperature-dependent photoluminescence (PL) studies on Cu–Zn–In–S quantum dot (QD) thin films. In this paper, cadmium-free and luminescent Cu–Zn–In–S quantum dot thin films were in situ formed by thermal decomposition of molecular-based precursors in the open air, without need of the complicated quantum dot synthesis. Molecular-based precursor solutions were prepared by dissolving Cu2O, ZnO, and In(OH)3 in the ethanol solution of butylamine and carbon disulfide. The effects of sintering temperature, sintering time, and the concentration of capping agents on the photoluminescence properties of Cu–Zn–In–S QD thin films have been systematically investigated. It was found that alkali metal ions play an important role in enhancing the PL quantum yield of quantum dot thin films. The as-prepared QD thin films show composition-tunable emission in the range of 535 nm to 677 nm, and the absolute PL quantum yields can reach as high as 22.1%. All of the as-deposited QD thin films show a single-exponential decay to temperature, indicating that these cadmium-free QD thin films have high potential as temperature probes.
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POLYMER BULLETIN
·
2015
·Vol. 72
·期 10
·2455-2469
·
IF 1.438
Bai Liangjiu,Wang Dongju,Chen Hou,Li Dongxin,Xu Yuanyuan,Yu Lili,Wang Wenxiang
Abstract Peanut shell (PNS) was used to prepare a novel adsorbent to achieve resource recovery of the agricultural residue. The hydroxyl groups of peanut shell were turned into –C(CH 3 ) 2 –Br pendant groups to initiate polymerization of acrylonitrile. Graft copolymer peanut shell/polyacrylonitrile (PNS- g -PAN) was modified by hydroxylamine hydrochloride to transform the cyano groups into amidoxime (AO) groups. The modified copolymer of AO-PNS- g -PAN was used as adsorbent. The maximum adsorption capacity for Hg(II) was 4.45 mmol g −1 . The adsorption process fitted well the Freundlich isotherm model and followed pseudo-second-order model. The modified copolymer demonstrated its potential as an efficient adsorbent to solve the problem of Hg(II) contamination. Graphical abstract The peanut shell (PNS) macroinitiator was obtained by acylation of hydroxyl groups on the cellulose backbone of the peanut shell and initiated by Cu(0)-mediated RDRP of acrylonitrile. PNS- g -PAN was modified by NH 2 OH·HCl and used to remove heavy metal ions. The maximum adsorption capacity of Hg(II) was 4.45 mmol g −1 .
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