JOURNAL OF ELECTRONIC MATERIALS
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2019
·Vol. 49
·期 2
·922-930
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IF 1.676
Evariste Uwamahoro,Jiang Guohua,Yu Bo,Liu Yongkun,Ma Pianpian
Ternary metal sulfides are potential and attractive materials for supercapacitors. Manganese-nickel-cobalt ternary sulfide (MNCS) nanosheets deposited on reduced graphene oxide/nickel foam (rGO/NF) have been synthesized via a simple electrochemical approach. The obtained ternary metal sulfide (MNCS@rGO/NF) showed better electrochemical performance than corresponding bimetal nickel-cobalt sulfides on reduced graphene oxide/nickel foam (NCS@rGO/NF), which can be attributed to the addition of manganese to increase the oxidation state in the electrodes. The MNCS@rGO/NF electrode material achieved a significant specific capacitance of 1302 F g −1 at 0.5 A g −1 , with good rate performance and cyclic stability. In addition, asymmetric supercapacitor devices using the MNCS@rGO/NF and rGO/NF as positive and negative electrodes were fabricated, delivering high energy density of 103.62 Wh kg −1 at power density of 562.47 W kg −1 and 39.93 Wh kg −1 at power density of 1514.78 W kg −1 .
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2019
·
IF 6.361
Haitao Wang,Xiaoyu Qiu,Zhuo Peng,Wei Wang,Junlei Wang,Tiansui Zhang,Lipei Jiang,Hongfang Liu
The exploration of an efficient nonprecious electrocatalyst for oxygen reduction reaction (ORR) is critical to the commercialization of various electrochemical energy-conversion devices. Herein, a cobalt-gluconate-derived nitrogen and sulfur dual-doped micro/mesoporous carbon sphere (Co 9 S 8 /N, S-MCS) with encapsulated high-density cobalt sulfide (Co 9 S 8 ) nanocrystals is developed by annealing and subsequent high-temperature vulcanization. Particularly, the vulcanization temperature has a critical impact on the formation of high-density Co 9 S 8 nanocrystals. Benefiting from the favorable material characteristics of large surface area, abundant micro/mesopores and high graphitic nanostructures, as well as the synergistic effects between high-density Co 9 S 8 nanocrystals and N, S-dual doped graphitic carbon shells, the resulting catalyst demonstrates superior ORR catalytic activity and durability compared to platinum/carbon (Pt/C) catalyst. More notably, the proposed approach can be extended potentially to fabricate other transition metal sulfide (or oxide, carbide) based electrocatalysts.
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SENSORS AND ACTUATORS B-CHEMICAL
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2019
·
IF 6.393
Xiao Chang,Xiaofang Li,Xurong Qiao,Kun Li,Ya Xiong,Xiao Li,Tianchao Guo,Lei Zhu,Qingzhong Xue
It is imperative to explore an accurate ppb-level acetone sensor for noninvasive detection of diabetes. In this work, two dimensional p-type MoS 2 nanosheets are introduced on the surface of p-type ZnO derived from metal-organic frameworks (MOFs) to produce ZnO@MoS 2 core/shell heterojunctions as a novel acetone sensor, showing a great enhancement of acetone response, about two orders of magnitude than that of pure ZnO derived from MOFs. For example, the ZnO@MoS 2 exhibits about 80 times enhancement in response to 100 ppb acetone than that of pure ZnO. More importantly, this ZnO@MoS 2 heterojunctions sensor exhibits an ultra-fast response/recovery to ultra-low concentration acetone (60 s/40 s @ 5 ppb), which is the best acetone sensing performance for the metal oxide-based materials reported to date. Moreover, the acetone sensing performances are negligibly affected by humidity and other gas, which is suitable for exhaled acetone detection. Finally, it is elucidated that the sharp increase of negative heterojunction interface resistance, ultra-fast gas diffusion rates in MoS 2 nanosheets and strong interaction energy are key factors for the excellent acetone sensing properties of ZnO@MoS 2 . This work opens up a novel and efficient way for ultra-low concentration gas detection.
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JOURNAL OF ELECTROANALYTICAL CHEMISTRY
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2019
·
IF 3.218
Zhenggang Jia,Xuexi Zhang,Jing Zhong,He Tian,Yueping Xiong
Reversible specific capacity and rate performance are required for MoS 2 nanomaterials as lithium-ion batteries (LIBs) anodes. Here we reported a novel MoS 2 structure with nano-size subgrain microstructure and thus enhanced electrochemical performance produced by a low-temperature hydrothermal synthesis technique. Ammonia solution treatment was proved feasible to remove the S 2 2 − and MoO 3 impurities from the composite produces. After purification of the MoS 2 prepared at a temperature of 160 °C, the (002) interlayer spacing was ~0.69 nm. In addition, the MoS 2 sheets consisted of nano-size subgrains, with Mo enrichment at grain boundaries. As a result, a reversible specific capacity of 826 mAh g − 1 at a current density of 0.1 A g − 1 and rate performance of 700 mAh g − 1 at 1 A g − 1 were achieved. This shows that high purity MoS 2 nanomaterials prepared via ammonia solution may act as promising materials for high performance anodes.
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ELECTROCHIMICA ACTA
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2019
·
IF 5.383
Shixiong Mei,Weili An,Jijiang Fu,Weiyuan Guo,Xiaoyu Feng,Xingxing Li,Biao Gao,Xuming Zhang,Kaifu Huo,Paul K. Chu
Although layered tin sulfide (SnS) nano-architectures are drawing much attention as anode materials in lithium ion batteries (LIBs) because of the high theoretical capacity, there are drawbacks such as the large volume expansion and low conductivity. To overcome these difficulties, attempts have been made to prepare tin sulfide/carbon (SnS/C) nano-hybrids by anchoring/coating nanostructured SnS on/in nano-sized carbon. However, the commonly reported SnS/C composites still suffer from initial Coulombic efficiency (ICE), high electrode swelling, and inferior long-term stability because of weak chemical affinity , and limited contacting interface between SnS and carbon specially at high SnS mass percentage. Herein, we report hierarchical micro-flowers self-assembled from SnS monolayers and nitrogen-doped graphene (NG) lamellar nanosheets (NG-SnS) which are suitable for LIBs anode. The NG-SnS with a high SnS mass percentage (93.9 wt%), obvious C–S bond, and increased contact provide to boost activity, utilization, conductivity, and reversibility of Li storage. Moreover, the elastic NG layers work as a mechanical supporter to decrease the outer volumetric expansion and restrain electrochemical agglomeration of SnS during (de)lithiation processes. The molecular engineered NG-SnS hybrid shows a high initial Coulombic efficiency of 88.2%, robust cycle stability with a high capacity of 790 mAh g −1 after 900 cycles at 0.5 C, considerable rate performance, and small electrode swelling of 12%.
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CHEMICAL ENGINEERING JOURNAL
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2019
·
IF 8.355
Cheng Tian,Hui Zhao,Hongli Sun,Kemeng Xiao,Po Keung Wong
Different from most composite structures with a common configuration of adsorbent-catalyst, g-C 3 N 4 thin nanosheets (CNNS) with the thickness of 8–11 nm had more efficient and stable adsorption and photocatalytic activities in the removal of tetracycline (TC) from aqueous solution. In comparison with common g-C 3 N 4 counterparts, the adsorption performance of CNNS increased by at least 10.3 times and that for photocatalytic efficiency increased for more than 4.8 times. The large contact area and delocalized π bonds provided by CNNS resulted in the enhanced TC adsorption capacity. The efficient separation and prolonged-lifetimes of photogenerated charge carriers, and the strong adsorption brought about a reinforced photocatalytic activity for TC degradation. The adsorption of TC onto CNNS was well followed the pseudo-second-order adsorption kinetics, and the obtained adsorption isotherm was well fitted to the Langmuir isotherm model. Due to the efficient adsorption and photocatalysis of CNNS, the zero-order and first-order kinetics models were presented during the different reaction time for TC photodegradation, the h + , O 2 − and OH radicals were confirmed as the major reactive oxidative species, and the degradation products were determined. This study provided a new route for the development of catalysts with efficient adsorption and photocatalytic activity in the purification of organic wastewaters.
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JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
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2019
·Vol. 19
·期 9
·5736-5742
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IF 1.093
Bai Jirong,Lv Wenhua,Xu Haiyang,Chen Gang,Ni Zhijiang,Wang Zhilei,Qin Hengfei,Zheng Zheng,Li Xi
Ag3PO4/sulfur-doped g-C3N4 heterojunctions were fabricated by the means of a facile calcination and co-precipitation method. Structural characterization suggested that Ag3PO4 was successfully loaded onto sulfur-doped
g-C3N4. The absorption band edges of sulfur-doped g-C3N4 were shifted to the longer wavelength in comparison with bulk g-C3N4. The Ag3PO4/sulfur-doped g-C3N4 heterojunctions manifested
substantially higher visible-light photocatalytic performance as compared with Ag3PO4/bulk g-C3N4. Photoluminescence spectra suggested that the stable Ag3PO4/SGCN heterojunctions could effectively address the electron—hole
recombination rate, together with remarkably enhancing the photocatalytic activity. The enhancement of light absorption and better dispersion in Ag3PO4/sulfur-doped g-C3N4 provide more migration channels, together with posing crucial responsibility
for the enhanced photocatalytic performance.
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Nanomaterials
·
2019
·Vol. 9
·期 9
·1244
·
IF 4.034
Haizeng Song,Han Wu,Yuan Gao,Ka Wang,Xin Su,Shancheng Yan,Yi Shi
Tin disulfide (SnS2) has gained a lot of interest in the field of converting solar energy into chemical fuels in light-assisted electrochemical water splitting due to its visible-light band gap and high electronic mobility. However, further decreasing the recombination rate of electron-hole pairs and increasing the density of active states at the valence band edge of the photoelectrodes were a critical problem. Here, we were successful in fabricating the super-thin SnS2nanostructure by a hydrothermal and solution etching method. The super-thin SnS2nanostructure as a photo-electrocatalytic material exhibited low overpotential of 0.25 V at the current density of −10 mA·cm−2and the potential remained basically unchanged after 1000 cycles in an H2SO4electrolyte solution, which was better than that of the SnS2nanosheet and SnS/SnS2heterojunction nanosheet. These results show the potential application of super-thin SnS2nanostructure in electrochemical/photo-electrocatalytic field.Keywords:layered semiconductor;solution etching;SnS2nanostructure;light-Assisted electrochemical water splitting
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CHEMICAL ENGINEERING JOURNAL
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2019
·
IF 8.355
Wanqing Li,Yuhang Li,Hongquan Fu,Guangxing Yang,Qiao Zhang,Shengzhou Chen,Feng Peng
A novel phosphorus-doped Co 9 S 8 and carbon nanosphere composite (Co 9 S 8 /P@CS) was successfully prepared by adding a certain amount of sodium hypophosphite during the thermal treatment process of preparing Co 9 S 8 . The results of XRD and XPS confirmed the incorporation of phosphorus into the lattice of Co 9 S 8 . Electrochemical tests demonstrated that Co 9 S 8 /P@CS performs a high electrocatalytic activity for oxygen evolution reaction (OER). Under the current density of 10 mA cm −2 , Co 9 S 8 /P@CS-1:2 as the best catalyst has the lowest overpotential of 233 mV and Tafel slope of 48 mV dec –1 , which is far superior to the current noble-metal catalyst IrO 2 (414 mV, 96 mV dec –1 ). A rechargeable Zn-air battery was assembled with Co 9 S 8 /P@CS-1:2 as the air-electrode catalyst. Its maximum power density reached 142.50 mW cm −2 at 0.56 V and the current density was 255.47 mA cm −2 , significantly higher than those of the battery made by Pt/C-IrO 2 catalysts. Especially, after 350 h (1050 cycles) of charge and discharge, the performance of this assembled battery did not show a significant decrease, predicting a broad application prospect. In-situ Fourier transform infrared spectroscopy (FTIR) and density functional theory (DFT) calculations were used to analyze the active sites of catalyst and catalytic mechanism, revealing the relationships between structure and the catalytic performance for OER.
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APPLIED SURFACE SCIENCE
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2019
·
IF 5.155
Yangqing He,Zhengrui Huang,Zhanying Ma,Binghua Yao,Haiyang Liu,Linlin Hu,Qing Zhao,Qian Yang,Dongjie Liu,Deguo Du
In this study, zinc (II) 1, 8(11),15(18),22(25) - tetrakis (4-carboxylphenoxy) phthalocyanine (α-ZnTcPc) was synthesized as sensitizer to construct a novel photocatalyst α-ZnTcPc/g-C 3 N 4 by a polycondensation strategy. The FT-IR and XPS spectra demonstrated that the α-ZnTcPc molecules were covalently coupled on g-C 3 N 4 . The 10%α-ZnTcPc/g-C 3 N 4 composites exhibit excellent extended spectral response with intense broad near-infrared absorption at 695 nm and with significantly fascinated charge carrier separation. As expected, the 10%α-ZnTcPc/g-C 3 N 4 displayed a remarkable improved photocatalytic performance in decomposition of methylene blue (MB) and antibiotic tetracycline with degradation rates of 94.49% and 91.43% under visible light irradiation, respectively. The hydroxyl radicals (·OH) were observed as the main reactive oxidizing species in tetracycline decomposition. Moreover, the possible mechanism for enhanced visible light photocatalytic capability might be ascribed to the synergetic effect between α-ZnTcPc and g-C 3 N 4 , which creates large surface areas, decreases the recombination rate of photogenerated charge carries, as well as improves the visible light harvesting significantly. This work not only presents a practical method to conquer the drawback of pure g-C 3 N 4 , but also provides useful insights to construct other g-C 3 N 4 -based composites to take full advantage of solar light towards practical applications for eliminating recalcitrant organic pollutants.
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ACS Applied Materials & Interfaces
·
2019
·
IF 8.456
Jun Wang,Yining Pan,Liangxing Jiang,Min Liu,Fangyang Liu,Ming Jia,Jie Li,Yanqing Lai
Copper ions are not only physiologically essential for life but also hazardous materials causing a series of neurodegenerative diseases. Photoelectrochemical (PEC) detection has attracted a large amount of focus as a potential strategy to develop Cu2+ ion sensors. However, relatively low photocurrent signals with poor antidisturbance ability and the limited concentration range have prevented its practical applications. Here, we designed a WO3/CdS heterojunction photoanode for the PEC determination of Cu2+ in aqueous solution through a simple two-step chemical bath deposition method. The obtained WO3/CdS photoanode had a nanoplate morphology and showed an enhanced photoresponsivity with a photocurrent density of 1.5 mA/cm2 at 1.23 V versus RHE under illumination. Naturally, it exhibited a low detection limit (0.06 μM) and wider range (0.5 μM to 1 mM) for Cu2+ PEC detection first, suggesting that the WO3/CdS heterojunction photoanode is a promising tool to monitor copper pollution in natural environments.
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SENSORS AND ACTUATORS B-CHEMICAL
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2019
·
IF 6.393
Guihua Zhang,Ying Yu,Li Zhang,Bixia Lin,Yumin Wang,Manli Guo,Yujuan Cao
Prostate specific antigen (PSA) is of great significance for clinical detection. Herein, a surface molecular imprinted sensor based on a novel cooperated signal amplification strategy was constructed for the precise detection of PSA. MoS 2 and gold nanoparticles were modified on the electrode surface as the sensing substrate, PSA template and 4-mercaptophenylboronic acid were employed to form the surface imprinted cavities, and the gold polymerized methylene blue composites labeled 4-mercaptophenylboronic acid was constructed as the tracing tag. Cyclic voltammetry, electrochemical impedance spectroscopy and differential pulse voltammetry measurements were performed to investigate the formation process of the sensor. Transmission electron microscopy, scanning electron microscopy and energy dispersive spectrometer analysis were utilized for the characterization of the sensing substrate and tracing tag. Once the target PSA was anchored on the sensor, an amplified signal was obtained by the cooperated electrochemical catalytic interaction of the nanomaterials on the tracing tag and substrate. The constructed sensor showed a wide linear range from 1.0 × 10 −4 to 1.0 × 10 4 ng·mL -1 , and the detection limit was 0.03 pg·mL -1 . Besides, such a sensor exhibited favorable selectivity, reproducibility and stability in the assays, indicating an expected application prospect in the determination of tumor markers.
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