Environmental Science-Nano
·
2018
·Vol. 6
·期 1
·207-215
·
IF 6.087
Miao Peng,Guijian Guan,Hong Deng,Bin Han,Chen Tian,Junyang Zhuang,Yunyun Xu,Weizhen Liu,Zhang Lin
Considering p-arsanilic acid (p-ASA) as an organoarsenic pollutant, monitoring concentration of p-ASA is significant to maintain environmental security. Photoelectrochemical (PEC) detection is promisingly applied in environmental monitoring for its lower cost and simpler operation, compared to traditional techniques. However, general electrode materials of PEC sensors need to be modified with biological probes due to lack of specific binding sites to analytes, which may lead to complicated sensor fabrication and bio-recognizers inactivation during storage. Herein, a porphyrinic metal–organic framework/reduced graphene oxide (PCN-224/rGO) nanocomposite with simultaneously excellent photoelectric activity and strong binding characteristics was prepared and used to fabricate a PEC sensor for p-ASA detection avoiding the modification of bio-recognizers. Benefiting from the high conductivity of rGO, the separation efficiency of charge carriers was improved in PCN-224/rGO and thereby photocurrent gained an amplification of about 12 times. The PCN-224/rGO nanocomposite had strong affinity to p-ASA via Zr–O–As coordination and π–π stacking. Significantly, the binding of p-ASA could adjust the band position of PCN-224/rGO and facilitate oxygen reduction by releasing more photogenerated electrons, achieving photocurrent enhancement. The developed PEC sensor had a wide detection range, from 10 ng L−1 to 10 mg L−1, with a detection limit of 5.47 ng L−1. Furthermore, the sensor was successfully applied to monitor p-ASA in simulated natural water and swine manure lixivium. This study paved the way for the design of more efficient PEC sensors for environmental monitoring.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2019
·
IF 4.084
Jianshuo Zhang,Kun Hou,Qianqian Yao,Chuxin Wu,Meihua Huang,Lunhui Guan
Transition metal phosphides represent a class of promising electrocatalysts for electrochemical water oxidization and other energy conversion reactions. In this work, we report a novel seal strategy, followed by a second step phosphorization treatment, produces Ni-Fe-P heterostructure directly grown on nickel foam that shows highly catalytic activity for electrochemical water oxidation . The as-prepared catalyst exhibits an excellent electrocatalytic activity , manifested by a current density of 20 mA cm −2 with a very low overpotential (260 mV) for oxygen evolution reaction along with an extremely small Tafel slope of 27 mV decade −1 and a very excellent durability of 120 h in alkaline solution. The excellent performance with exceptional durability owe much to the synergistic effect between the Ni-Fe-P heterostructure and the outer oxidized layer. Remarkably, a current density of 10 mA cm −2 was reached at a low cell voltage of 1.63 V when the original electrode and surface oxidized electrode are used as cathode and anode , respectively.
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NEW JOURNAL OF CHEMISTRY
·
2019
·Vol. 43
·期 12
·4815-4822
·
IF 3.069
Jin Wang,Mengde Deng,Yahui Xiao,Wentao Hao,Chengfeng Zhu
Polyelectrolytes with good ionic conductivity and dielectric properties have been shown to be superior for supercapacitors and other power storage devices. Here, a cationic polyelectrolyte with blended poly(N-vinylpyrrolidone-co-diallyl dimethyl ammonium chloride) (P(NVP-co-DMDAAC)) copolymer and poly(vinyl alcohol) (PVA) was prepared via the interpenetrating polymer network (IPN) technique. The dielectric properties, ionic conductivity, mechanical properties and the influence of the thicknesses of hydrogel membranes on capacitance properties were studied. The introduction of the cationic DMDAAC monomer and polar PVA increased the integrated performance of the PNVP hydrogel. In comparison with PVA, PNVP, and P(NVP-co-DMDAAC), P(NVP-co-DMDAAC)/PVA IPN hydrogel exhibited higher permittivity of 27.19 at 1 kHz frequency and the maximum ionic conductivity of 3.66 × 10−2 S cm−1 at 10% PVA dosage. The tensile strength increased with the increase in the PVA content. The specific capacitances of P(NVP-co-DMDAAC)/10PVA increased with the decrease in the thickness of the hydrogel membrane and its retention rate was 95% after 1000 cycles.
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JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
·
2019
·
IF 3.261
Minghuan Gao,Lisha You,Linna Guo,Tiesheng Li
Polyhedron-like WO 3 (n-type WO 3 ) nanoparticles were synthesized by a simple hydrothermal reaction without using any template or surfactant. The Polyhedron-like WO 3 /Ag 2 CO 3 p-n junction photocatalyst was first synthesized by a simple impregnation-deposition way. The obtained samples were investigated by XRD, BET, XPS, SEM, TEM etc. The separation mechanisms of photo-induced electrons (e − ) and photo-induced holes (h + ) of the Polyhedron-like WO 3 /Ag 2 CO 3 p-n junction samples were characterized by PL technique, EIS and determination of active sites and species in the photocatalytic reactions. In this p-n junction structure, Polyhedron-like WO 3 nanoparticles adhered to the surface of the Rod-like p-type Ag 2 CO 3 nanoparticles. The Polyhedron-like WO 3 /Ag 2 CO 3 p-n junction photocatalyst showed much higher photocatalytic activity than both single materials for RhB degradation under UV–vis light irradiation, and even 17 times higher than commercial powders (P25) at the same circumstance. Even compared with the related photocatalyst, it still exhibits the highest photocatalytic ability. The highly enhanced photocatalytic of the Polyhedron-like WO 3 /Ag 2 CO 3 p-n junction photocatalyst can be attributed to extended absorption, more effective separation of photogenerated charges, the transfer rate of photo-induced charge carriers and forming of p-n junction system.
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JOURNAL OF CATALYSIS
·
2019
·
IF 7.723
Yixuan Gao,Shihao Zhang,Yishi Wu,Yang Tian,Hongbing Fu,Sihui Zhan
Photoelectrochemical (PEC) water splitting via semiconductors is an effective and feasible method for synthesizing renewable hydrogen (H 2 ) fuels. In this study, β-In 2 S 3 nanosheets were first grown on conductive glass. Then, we prepared P-doped β-In 2 S 3 nanosheets with an amorphous InPO x overlayer via the incomplete phosphorization of pristine β-In 2 S 3 nanosheets. When we used this material as photoanode in a PEC cell for water splitting, the photocurrent density drastically increased to 2.2 mA cm −2 at 1.23 V versus a reversible hydrogen electrode (vs. RHE). It enhanced 15 times as the pristine β-In 2 S 3 nanosheets, which was only 0.15 mA cm −2 at 1.23 V vs. RHE (solar standard spectrum, 100 mW cm −2 ). The photoelectric conversion efficiency as high as 0.65% at a low potential of 0.81 V vs. RHE was achieved for the phosphorized β-In 2 S 3 nanosheets. A series of experiments proved that the P-doping accelerated semiconductor charge-transport and the InPO x overlayer played cocatalyst role. We penetratingly investigated the pathway of charge transfer via femtosecond transient absorption. The results showed one pathway of charge transfer in pristine β-In 2 S 3 photoanode. However, there were two pathways (core/shell coupling and shallow trap states) for charge transfer in the phosphorized β-In 2 S 3 photoanode, which improved the performance of its PEC water oxidation.
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Journal of Materials Chemistry A
·
2019
·Vol. 7
·期 16
·9791-9797
·
IF 10.733
Kai Deng,You Xu,Dandan Yang,Xiaoqian Qian,Zechuan Dai,Ziqiang Wang,Xiaonian Li,Liang Wang,Hongjing Wang
The structure- and composition-controlled synthesis of Pt-based nanocatalysts is highly important for improving their catalytic performance while reducing the overall use of precious Pt. Here, an effective strategy is developed to combine surface porosity, hollow cavities and metal–nonmetal incorporation engineering on Pt, resulting in ternary Pt–Ni–P mesoporous nanocages (Pt–Ni–P MNCs). Owing to the mesoporous surface, hollow structure and synergistic electronic effects derived from Pt, Ni, and P elements, the as-prepared Pt–Ni–P MNCs exhibit excellent electrocatalytic activity and long-term stability for both the oxygen reduction reaction (ORR) and methanol oxidation reaction (MOR), enabling them to be promising ORR–MOR bifunctional electrocatalysts for direct methanol fuel cells.
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TALANTA
·
2018
·
IF 4.244
Na Xiao,Shi Gang Liu,Shi Mo,Na Li,Yan Jun Ju,Yu Ling,Nian Bing Li,Hong Qun Luo
p -Nitrophenol ( p -NP) contaminants seriously endanger environmental and living beings health, hence to establish a sensitive and selective method is of great importance for the determination of p -NP. In this work, boron and nitrogen co-doped carbon dots (B,N-CDs) were synthesized by one-step hydrothermal method using 3-aminophenylboronic acid as the sole precursor. The product was characterized through high-resolution transmission electron microscopy, fluorescence spectroscopy, UV–visible absorption spectroscopy , X-ray photoelectron spectroscopy, and Fourier transform infrared spectroscopy. Without any functionalized modification, B,N-CDs can be directly applied as a ‘turn-off’ fluorescent probe for rapid, highly selective, and sensitive detection of p -NP. The fluorescent sensor based on the B,N-CDs exhibited a broad linear response to the concentration of p -NP in the range of 0.5 − 60 μM and 60 − 200 μM, respectively, and provided a detection limit of 0.2 μM. It was found that only the absorption spectrum of p -NP has a wide overlap with the fluorescence excitation and emission spectra of B,N-CDs compared to those of other representative analogues. The response mechanism was due to the inner filter effect and the formation of dynamic covalent B-O bonds between B,N-CDs and p -NP, which endowed the sensing platform with the rapid response and high selectivity to p -NP. Finally, the sensor showed the practicability of p -NP determination in environmental water samples.
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PubMed
高影响因子
Chinese Physics B
·
2018
·Vol. 27
·期 4
·047211
·
IF 1.321
Chengyan Liu,Lei Miao,Xiaoyang Wang,Shaohai Wu,Yanyan Zheng,Ziyang Deng,Yulian Chen,Guiwen Wang,Xiaoyuan Zhou
Thermoelectric selenides have attracted more and more attentions recently. Herein, p-type SnSe polycrystalline bulk materials with good thermoelectric properties are presented. By using the SnSe2 nanostructures synthesized via a wet-chemistry route as the precursor, polycrystalline SnSe bulk materials were successfully obtained by a combined heat-treating process under reducing atmosphere and following spark plasma sintering procedure. As a reference, the SnSe nanostructures synthesized via a wet-chemistry route were also fabricated into polycrystalline bulk materials through the same process. The thermoelectric properties of the SnSe polycrystalline transformed from SnSe2 nanostructures indicate that the increasing of heattreating temperature could effectively decrease the electrical resistivity, whereas the decrease in Seebeck coefficient is nearly invisible. As a result, the maximum power factor is enhanced from 5.06\times {10}^{-4}\,{\rm{W}}/{\rm{m}}\cdot {{\rm{K}}}^{2} to 8.08\times {10}^{-4}\,{\rm{W}}/{\rm{m}}\cdot {{\rm{K}}}^{2} at 612 °C. On the other hand, the reference sample, which was obtained by using SnSe nanostructures as the precursor, displays very poor power factor of only 1.30\times {10}^{-4}\,{\rm{W}}/{\rm{m}}\cdot {{\rm{K}}}^{2} at 537 °C. The x-ray diffraction (XRD), scanning electron microscope (SEM), x-ray fluorescence (XRF), and Hall effect characterizations suggest that the anisotropic crystal growth and existing Sn vacancy might be responsible for the enhanced electrical transport in the polycrystalline SnSe prepared by using SnSe2 precursor. On the other hand, the impact of heat-treating temperature on thermal conductivity is not obvious. Owing to the boosting of power factor, a high zT value of 1.07 at 612 °C is achieved. This study provides a new method to synthesize polycrystalline SnSe and pave a way to improve the thermoelectric properties of polycrystalline bulk materials with similar layered structure.
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Materials
·
2018
·Vol. 11
·期 8
·1316
·
IF 2.467
Shuai Wang,Jia Wang,Ping Li,Zexing Wu,Xien Liu
Efficient electrocatalyst plays a significant role on the development of hydrogen energy. In this work, an N,P-codoped carbon layer coupled with MoP nanoparticles (MoP/NPCs) was prepared through a facile high-temperature pyrolysis treatment. The obtained MoP/NPCs presented efficient activity for hydrogen evolution reaction (HER), with low onset potential of 90 mV, and a small Tafel slope (71 mV dec−1), as well as extraordinary stability in acidic electrolyte. This work provides a new facile strategy for the design and synthesis of sustainable and effective molybdenum-based electrocatalysts as alternatives to non-Pt catalysts for HER.Keywords:electrocatalysts;hydrogen evolution reaction;carbon layer;molybdenum phosphide
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MACROMOLECULAR MATERIALS AND ENGINEERING
·
2018
·Vol. 303
·期 7
·1800104
·
IF 2.69
Wen Jiang Zheng,Yang Gao,Xiao Xi Fan,Xiao Feng Cui,Wei Zou,Dan Zheng,Jie Yan,Bin Li
The application of traditional chemically crosslinked hydrogels is often limited by poor mechanical properties because of their own inhomogeneous network and irreversible crosslinking bonds. Herein, physical interactions are applied to crosslink the interpenetrating network hydrogel, i.e., hydrogen bonding and crystalline domain for polyvinyl alcohol network, and hydrophobic interaction inside micelle for poly (acrylamide- co -stearyl methyl acrylate) [P(AAm- co -SMA)] network. In this gel network system, reversible energy dissipation mechanism is realized by dissociation and reassociation of weak interactions including hydrogen bonding and hydrophobic interaction inside the micelle. Strong crystalline domains serve as permanent crosslinking interactions to maintain network integrity under large extension. As a result, the synergy of weak and strong interactions leads to tough, antifatigue, fast recovery, and self-healing properties of the hydrogel. This proposed strategy of achieving versatile hydrogels can broaden the use of hydrogels into load-bearing applications.
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JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2018
·Vol. 317
·期 3
·1235-1241
·
IF 1.181
Wang Cheng,Xiao Fang-zhu,Pu Yi-qiu,Xu Yu-li,Xu Dong-yang,Zhang Kang,Liu Yong,Peng Guo-wen
P -carboxyphenyl azo calix[4]arene phosphate derivative (P-CACPD) was successfully synthesized using calix[4]arene as raw material. The P-CACPD was characterized by FT-IR and 1 H-NMR. The effects of pH, extraction time and temperature on the extraction of U(VI) by P-CACPD were investigated. The results show that pH value, extraction time and temperature have an effect on the extraction of U(VI) by P-CACPD. When the initial pH is 5, temperature is 25 °C, extraction time is 2 h, the extraction rate of U(VI) by P-CACPD reaches the maximum. Both kinetics parameters and thermodynamic parameters of the extraction process were calculated. The calculated data indicate that the extraction process of uranium by P-CACPD is an exothermic spontaneous process, which well fits with the pseudo-second-order kinetic model.
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TALANTA
·
2018
·
IF 4.244
Zhiqing Yang,Yi Wang,Dun Zhang,Chao Chen
Using photoelectrochemical (PEC) platform for ultrasensitive detection of sulfate-reducing bacteria (SRB) is a big challenge since sensor sensitive component can be damaged by corrosive metabolites. In this work, a novel bio-etching strategy for sensitizing PEC platform is developed to detect SRB. In the presence of bacterial metabolite (H 2 S), BiOCl platform can be bio-etched to form Bi 2 S 3 /BiOCl p-n heterojunction, leading to a significant enhancement of photocurrent . The PEC sensing platform fabricated by bio-etching strategy presents acceptable detection specificity and high detection sensitivity with a low detection limit of 29 cfu/mL for SRB. The current work can provide new strategies to sensitize PEC platforms for detection of microorganisms that produce corrosive metabolite.
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