Journal of Materials Chemistry A
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2018
·Vol. 6
·期 39
·19201-19209
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IF 9.931
Guoqiang Liu,Zhongti Sun,Xian Zhang,Haojie Wang,Guozhong Wang,Xiaojun Wu,Haimin Zhang,Huijun Zhao
Electrocatalytic water splitting has been widely accepted as an environmentally friendly approach to generate clean H2. However, the sluggish oxidation half reaction, namely, the oxygen evolution reaction (OER), usually requires a high overpotential, which is the obstacle to high-efficiency overall water splitting to generate H2. Herein, we report the preparation of ultrathin nanosheet array Ni3S2 with a 9–14 nm nanosheet thickness grown directly on a commercial Ni foam substrate (Ni3S2/NF) by in situ vapor-phase hydrothermal (VPH) transformation of the nanosheet array structure Ni(OH)2/NF precursor. As a multifunctional electrocatalyst, the as-fabricated Ni3S2/NF-2 (VPH time of 2 h) displays excellent electrocatalytic activities toward the hydrazine oxidation reaction (HzOR) with a potential of 0.415 V (vs. RHE) to deliver a current density of 100 mA cm−2, an OER with an overpotential of 425 mV obtaining the same current density, and a hydrogen evolution reaction (HER) with an onset potential of −0.05 V (vs. RHE) in 1.0 M KOH media. A two-electrode system is therefore constructed using Ni3S2/NF-2 as both the anode and cathode, capable of achieving 100 mA cm−2 at 0.867 V in 1.0 M KOH with 0.2 M hydrazine. Density functional theory (DFT) calculations reveal that the adsorption of N2H4 molecules on the Ni3S2 (110) is more thermodynamically favourable than H2O, thus contributing to the high HzOR activity.
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ELECTROCHIMICA ACTA
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2018
·
IF 5.116
Yue Bao,Yuping Huang,Xiong Song,Jin Long,Suqing Wang,Liang-Xin Ding,Haihui Wang
Activation is a common strategy to tailor microstructure of carbon materials . A new activation combined with heteroatom doping of carbon nanofibers is proposed to synthesize the N, S-doped carbon nanofibers (NSCNFs). After electrospinning and followed thermal treatment with thiourea , the diameter of the as-obtained NSCNFs decreases with much more abundant pore structure and functionalized with S-containing oxygen groups compared with that obtained without activation. The increased specific surface area and pore volume are beneficial to facilitate the Na + diffusion and provide more active sites to increase adsorption capacitance and facilitate pseudo-capacitive reactions. Also, the S-containing oxygen groups contribute to pseudo-capacitance by faradaic reactions. As a result, capacitive behavior is boosted hence leading to a excellent rate capability and cycling stability. The flexible and freestanding NSCNFs film is directly used as anode for sodium-ion batteries (NIBs) and shows excellent rate capability with reversible capacity of 147 and 133 mA h g -1 at 10 and 30 A g −1 , respectively. Remarkably, ultra-long cyclic life is also achieved with 90.8% capacity retention after 6000 cycles at 10 A g −1 . Such electrochemical performance makes NSCNFs promising to be used in high power and durable NIBs. This activation strategy can also be expanded to functionalize other carbon materials.
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ELECTROCHIMICA ACTA
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2018
·
IF 5.116
Changqing Li,Xu Zhao,Yiwen Liu,Wei Wei,Yuqing Lin
Developing highly active and stable electrocatalysts from earth-abundant elements are imperative for the large-scalable production of hydrogen. Herein, the three dimensional amorphous NiCoS x O y nanosheets arrays directly grow on Ni foam (NiCoS x O y NSs/NF) through a facile one-step electrodeposition is firstly reported. The special in-situ grown 3D nanosheets arrays, largely exposed active sites and enhanced electrical conductivity enable the resultant NiCoS 0.14 O 3.25 NSs/NF to possess remarkable electrocatalytic performance and stability towards water splitting in 1 M KOH. Specifically, the introduction of S ligand into the hydroxides through a straightforward and convenient electrodeposition method boost the robust composition and comprehensive activity of the NiCoS x O y NSs. Such binder-free, easily prepared NiCoS 0.14 O 3.25 NSs/NF electrode requires the overpotential of 250 mV and 170 mV at 10 mA cm −2 for oxygen evolution reaction (OER) and hydrogen evolution reaction (HER), respectively. When functionalizing as two identical cathode and anode in an alkaline electrolyzer, NiCoS 0.14 O 3.25 NSs/NF displays the efficient and robust property on both OER and HER. Remarkably, serving as bifunctional electrode in alkaline electrolyzer, it only needs 1.64 V to reach the current density of 20 mA cm −2 . This study provides a valuable guideline to synthesize non-noble and efficient bifunctional electrocatalysts using a time-saving but facile electrochemical method.
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CHEMICAL ENGINEERING JOURNAL
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2018
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IF 6.735
Jianhui Zhao,Ning Li,Ruixin Yu,Zhiwei Zhao,Jun Nan
It is difficult to achieve concurrent removal of nitrate (NO 3 − -N) and ammonia (NH 4 + -N) from water thoroughly by photocatalysis due to their opposite charges and inappropriate potentials of photo-induced carriers. Herein, an innovative magnetic field enhanced 3D/2D Mn 2 O 3 /g-C 3 N 4 photocatalytic system was developed for denitrification from NO 3 − -N and NH 4 + -N contaminated water under visible light. High removal efficiency of 94.5% and 97.4% for NO 3 − -N and NH 4 + -N were achieved after imposing magnetic field. Impressively, the extra magnetic field integrated the advantages of providing driving force for NO 3 − -N and NH 4 + -N approaching catalyst surface as well as facilitating separation of photo-induced charge carriers in newly-formed II type heterojunction by generating Lorentz force . Interestingly, the electrons on conduction band of g-C 3 N 4 could reduce NO 3 − -N to NO 2 − -N, N 2 and NH 4 + -N. Subsequently, the produced NO 2 − -N could be reduced to N 2 and NH 4 + -N. Meanwhile, the holes on valence band of Mn 2 O 3 could convert NH 4 + -N to N 2 selectively, which made the dominate contribution to high N 2 recovery (93.2%) during photocatalysis. Moreover, the reusable Mn 2 O 3 /g-C 3 N 4 achieved efficient denitrification under magnetic assisted photocatalysis in real water backgrounds such as tap water and river water. This study provided an efficient and promising strategy for nitrogen remediation from water.
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SENSORS
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2019
·Vol. 19
·期 10
·2289
·
IF 3.031
Lina Abdullah Alshahrani,Liqiong Miao,Yanyu Zhang,Shengming Cheng,Palanivel Sathishkumar,Balasubramaniam Saravanakumar,Junmin Nan,Feng Long Gu
A copper sulfide nanoflakes-decorated carbon nanofragments-modified glassy carbon electrode (CuS-CNF/GCE) was fabricated for the electrocatalytic differentiation and determination of hydroquinone (HQ) and catechol (CC). The physicochemical properties of the CuS-CNF were characterized by scanning electron microscopy, transmission electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy and Raman spectroscopy. The electrocatalytic determination of HQ and CC over the CuS-CNF/GCE was evaluated by cyclic voltammetry and differential pulse voltammetry. An excellent detection limit and sensitivity of the CuS-CNF/GCE are obtained (0.293 µM and 0.259 µM) with a sensitivity of 184 nA µM−1cm−2and 208 nA µM−1cm−2(S/N=3) for HQ and CC, respectively. In addition, the CuS-CNF/GCE shows a selective identification of HQ and CC over potential interfering metal ions (Zn2+, Na+, K+, NO3−, SO42−, Cl−) and organic compounds (ascorbic acid, glucose), and a satisfactory recovery is also obtained in the spiked water samples. These results suggest that the CuS-CNF/GCE can be used as an efficient electrochemical sensor for the simultaneous determination of co-existing environmental pollutants such as HQ and CC in water environments with high selectivity and acceptable reproducibility.Keywords:carbon nanofragments;copper sulfide;catechol;hydroquinone;electrochemical sensor;simultaneous determination
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PubMed
高影响因子
BIOMATERIALS
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2019
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IF 10.273
Zhang Yuan,Bailong Tao,Ye He,Ju Liu,Chuanchuan Lin,Xinkun Shen,Yao Ding,Yonglin Yu,Caiyun Mu,Peng Liu,Kaiyong Cai
To inhibit bacterial infection in situ and improve osseointegration are essentially important for long-term survival of an orthopedic implant , in particular for infection-associating revision surgery. Herein, we fabricate a functional molybdenum disulfide (MoS 2 )/polydopamine (PDA)-arginine-glycine-aspartic acid (RGD) coating on titanium (Ti) implant to address above concerns simultaneously. The coating not only improved the osteogenesis of mesenchymal stem cells (MSCs), but also endowed Ti substrates with effective antibacterial ability when exposing to near-infrared (NIR) irradiation. It accelerated glutathione (GSH) oxidation via photothermal energy and induced intrinsic ROS-independent oxidative stress damage deriving from MoS 2 nanosheets . The results displayed that RGD-decorated MoS 2 nanosheets significantly increased the cellular osteogenic behaviors of MSCs via up-regulating osteogenesis-related genes (ALP, Runx2, Col I and OCN) in vitro. Moreover, the functionalized Ti substrates demonstrated great antibacterial efficiency of over 92.6% inhibition for S. aureus and E. coli under NIR-irradiation. Hyperthermia induced by photothermal effect accelerated the GSH consumption and ROS-independent oxidative stress destroyed the integrity of bacteria membranes , which synergistically led to protein leakage and ATP decrease. Furthermore, co-culture experiment showed that S. aureus contamination was efficiently cleaned from MoS 2 /PDA-RGD surface after NIR photothermal treatment, while MSCs adhered and proliferated on the MoS 2 /PDA-RGD surface. In an S. aureus infection model in vivo, MoS 2 /PDA-RGD modified Ti rods killed bacteria with an efficiency of 94.6% under NIR irradiation, without causing damage to normal tissue. More importantly, the MoS 2 /PDA-RGD modified Ti implants accelerated new bone formation in comparison with TNT implants in vivo .
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SURFACE REVIEW AND LETTERS
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2018
·
IF 0.734
MAO ZHOU,XIAOCAI LIANG,YUQING MIAO
The preparation of ultrathin Ni layer onto the surface of glassy carbon electrode (GCE) by molecule anchoring method was studied in this paper in which two steps were involved: molecule anchoring (GCE-M) and ultrathin Ni layer adsorption (GCE-M-Ni). The result showed that by simply anchoring some molecules (purpald, bismuthiol I, DPTA, EDTA-2Na, ferrotitanium and thiourea) onto the surface of GCE, the adsorption of Ni layer would be improved relatively, thus improving the electrocatalytic ability of GCE toward sucrose, fructose and glucose. It was believed that the anchoring of these molecules helped the following adsorption of Ni layer. Good electrocatalytic characteristics for sugars oxidation of GCE-purpald-Ni were observed in this work with the immediate response, wide linear range from 0 μ M to 800 μ M and low detection limit down to 0.49 μ M for the sensing of total sugar (TS) concentration. The common interfering molecule such as ascorbic acid was proved of no interfering effect on the detection. Also, GCE-purpald-Ni was successfully applied to detect TS concentration in orange juice samples with high recovery rate of more than 85%. It is concluded that the molecule anchoring method can be used to the adsorption of ultrathin Ni layer onto the surface of GCE and works as one of the promising nonenzymatic sensings toward sugars.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2018
·
IF 11.698
Zhenying Jiang,Lingzhi Wang,Juying Lei,Yongdi Liu,Jinlong Zhang
The application of photo-Fenton process is restricted by the acidic pH and additional hydrogen peroxide (H 2 O 2 ). In order to overcome these drawbacks, a photo-Fenton system of CdS/rGO/Fe 2+ which can perform at natural pH with in situ -generated H 2 O 2 has been successfully developed. Highly efficient photo-Fenton degradation of phenol was achieved under the visible light irradiation via the CdS/rGO/Fe 2+ system. Experimental results showed that phenol could be degraded completely in 1 h at natural pH. The plentiful in situ generation of H 2 O 2 was further proved to act as an important role in phenol degradation with the addition of Fe 2+ . The advantages of degradation at natural pH with in situ -generated H 2 O 2 can provide a new prospective to the environmental-friendly Fenton process.
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DALTON TRANSACTIONS
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2018
·Vol. 47
·期 36
·12671-12683
·
IF 4.099
Sugang Meng,Yanjuan Cui,Hao Wang,Xiuzhen Zheng,Xianliang Fu,Shifu Chen
The development of stable noble metal-free photocatalysts with efficient separation and transportation of the photogenerated electrons–holes is of crucial importance for promoting the application of photocatalysis technology. Herein, we propose an electron transfer strategy by reasonable design and fabrication of novel 0D NiSx nanosheets as a co-catalyst on the surface of 1D CdS nanorods (CdS-NRs) to enhance photocatalytic hydrogen evaluation and contamination (Cr(VI), rhodamine B and bisphenol A) removal in water. Under visible light irradiation, the 0D–1D NiSx/CdS-NR nanocomposite with 1.5% NiSx loading gave a hydrogen evolution rate of 5.98 mmol h−1 g−1, which is about 5.3 times and 1.9 times higher than that of the native CdS-NRs and the optimal 1% Pt/CdS-NRs, respectively. Notably, good stability in the recycling test and a high apparent quantum efficiency of about 69.9% at 420 nm were also obtained. The 1.5% NiSx/CdS-NRs exhibited enhanced photocatalytic contamination degradation efficiency of about 2 times higher than pure CdS-NRs. In this hybrid photocatalyst, 0D NiSx nanosheets came into intimate interfacial contact with the surface of 1D CdS-NRs and played a similar role as noble metals, which could effectively improve the separation, transportation efficiencies and lifetime of photogenerated charge, and thus enhance the photocatalytic performance of CdS-NRs with more efficient conversion of solar energy. This work shows not only a possibility for the utilization of noble metal-free NiSx as a co-catalyst in the photocatalysis, but also provides new insight into the design and fabrication of high-performance composite photocatalysts (such as NiSx/g-C3N4 and NiSx/Zn3In2S6).
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高影响因子
APPLIED SURFACE SCIENCE
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2018
·
IF 4.439
Hang Zhao,Jinhua Wu,Jianlong Li,Hao Wu,Yun Zhang,Heng Liu
MoS 2 has been investigated extensively as novel energy storage materials because of its unique physical and chemical properties. Herein, a flexible Three-Dimensional (3D) free-standing composite is rationally designed and synthesized by growing MoS 2 nanosheets onto carbonized melamine foam. Afterwards, nitrogen-doped carbon (NC) coating is created on the bare MoS 2 nanosheets depends on dopamine self-polymerization. The composite can be used directly as a free-standing anode for lithium-ion batteries. It exhibits high reversible lithium storage capacity with good cyclic performance (573.8 mAh g −1 at current density of 500 mA g −1 after 200 cycles) and rate capability (536.9 mAh g −1 at current density of 2000 mA g −1 ). The outstanding electrochemistry properties are mainly attributed to the well-designed architecture. The interconnected carbon skeleton provides 3D fast transport paths for electron. NC coating on MoS 2 nanosheets and the carbon filled in the interspaces between MoS 2 nanosheets serves as conductive matrix which enhances the electrical conductivity, expands the path of electron transport and accelerates electron transfer.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2018
·
IF 3.779
Jirong Bai,Wenhua Lv,Zhijiang Ni,Zhilei Wang,Gang Chen,Haiyang Xu,Hengfei Qin,Zheng Zheng,Xi Li
MoS 2 /S-doped porous g-C 3 N 4 (MoS 2 /SPGCN) hybrids were fabricated via a facile calcination and ultrasound assembly method. Structural characterization indicated MoS 2 nanosheets were successfully loaded on SPGCN isotype heterojunction hybrids. The MoS 2 /SPGCN photocatalysts showed more visible light absorption, larger specific surface area, and faster electron-hole separation. MoS 2 /SPGCN significantly accelerated Rhodamine B photodegradation under visible light irradiation, which was mainly because the enriched active sites, broadened visible light absorption, and newly-formed heterojunction between MoS 2 nanosheets and SPGCN together suppressed the recombination of photoinduced electron-hole pairs. MoS 2 /SPGCN also showed excellent recyclability and chemical stability. Thus, this work presents a good strategy of designing efficient photocatalysts by substituting the single catalyst base with metal-free isotype heterojunction hybrids.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2018
·
IF 3.779
He Yang,Xu Zhang,Junling Guo,Weili Zhu,Shupeng Zhao,Fang Wang,Qiuyu Fan,Hongyan Xiao,Fengxiang Zhang
Lithium sulfur (Li-S) battery is considered as one of promising energy-storage devices owing to its high energy density and low cost. However, it is still a great challenge to explore stable sulfur cathode with high sulfur loading and good cycling performance. Herein, we report a facile method to prepare N,S co-doped hierarchical pore structured carbon foam @porous carbon (CF@N-SPC) through a carbonation process from resin aerogel coated melamine foam with thiourea as the source for N and S codoping. The close combination of a carbon interconnected skeleton and the resin aerogel derived carbon forms the hierarchical pore structure that improves the electron and ion transport. The prepared CF@N-SPC can be used as a freestanding cathode without a conductive additive and a binder. Due to the synergistic effect of the hierarchical pore structure and N, S codoping, the sulfur loading in the carbon foam-based cathode can reach up to 10.6 mg cm −2 . Owing to these unique merits, the CF@N-SPC/S cathode exhibits high capacity and good cycling performance: it yields a discharge capacity of 1212 mA h g −1 at 0.1 C with 4.0 mg cm −2 sulfur loading; it also exhibits a good discharge capacity of 668 mA h g −1 at 0.5 C when the sulfur loading increases to 10.6 mg cm −2 , capacity retained by 72% in 200 cycles; it experiences a very small capacity decay rate of 0.05% per cycle in 700 cycles at 1 C. Our rational design and facile synthesis of the carbon foam-based freestanding cathode is promising and applicable for development of high performance Li-S batteries.
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危险品化学品经营许可证（带存储）