Journal of Energy Storage
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2021
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IF 6.583
Weizhi Gong,Mingjun Wang,Yi An,Junli Wang,Liexing Zhou,Yi Xia,Chunjian Wang,Kun Dong,Cheng Pan,Rongfeng Zhou
Cycling stability and specific capacitance are two of important performance parameters for pseudocapacitive electrodes under frequent charging and discharging. Herein, we present a facile solvothermal approach to rationally design and fabricate chiffon-like and hydrotalcite-like α-Co(OH) 2 nanoflakes for extrinsic pseudocapacitive electrode, which exhibits linear galvanostatic discharge behavior and superior charge-storage performance, including high capacitance of 475 F g −1 at 1 A g −1 , excellent rate capability and superb cycling stability with capacitance retention of 93.9% after 10000 cycles at 10 A g −1 . The superior performance is mostly attributed to the good electrical conductivity and stable microstructure of the hydrotalcite-like α-Co(OH) 2 nanoflakes and the abundant redox active sites on the chiffon-like nanoflakes with short and facile electron transport. In addition, other α-Co(OH) 2 samples with different morphologies and size as contrast are prepared and discussed, indicating that the morphology/size design and optimization of the α-Co(OH) 2 could greatly improve the electrochemical energy-storage performance. The findings demonstrate that the chiffon-like and hydrotalcite-like α-Co(OH) 2 nanoflakes have a great practical application potential in long-life and high-performance supercapacitors . This study also presents a facile way to design and prepare nanoflake-like materials with adjustable lateral size and thickness from spherical morphology consisting of nanoflakes.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2020
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IF 4.939
Li-Wen Jiang,Yuan Huang,Bing-Bing Chen,Jian-Qiu Zhou,Hong Liu,Jian-Jun Wang
Hydrogen production via alkaline water electrolysis is of significant interest. However, the additional water dissociation step makes the Volmer step a relatively more sluggish kinetics and consequently leads to a slower reaction rate than that in acidic solution. Herein, we demonstrate an effective strategy that Co(OH) 2 can promote the Volmer process by accelerating water dissociation and enhance the electrocatalytic performance of CoP toward alkaline hydrogen evolution reaction . The Co(OH) 2 nanoplates are electrochemically induced in-situ generated to form a nanotree-like structure with porous CoP nanowires , endowing the hybrid electrocatalyst with superior charge transportation, more exposed active sites, and enhanced reaction kinetics. This strategy may be extended to other phosphides and chalcogenides and provide insight into the design and fabrication of efficient alkaline HER catalysts.
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POLYMER TESTING
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2020
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IF 3.275
Lefan Li,Qiao Wang,Xiaoxu Liang,Zongjin Li,Siyao Guo,Guoxing Sun
Most studies on enhanced polymer gels look at modifying the interaction between the polymer matrix and fillers. Here, a new strategy is proposed for the fabrication of a new kind of polyacrylamide/Ca(OH) 2 nanocomposite organogel with tunable mechanical properties and temperature tolerance. By changing the solvent component, the properties of an organogel can be modulated without adding further reinforcing agent. Two commonly used organic solvents, glycerin (GL) and ethylene glycol (EG), were used in different weight ratios (GL:EG = 100:0, 70:30, 50:50, 30:70, 0:100) to achieve modulation of the organogel properties. At 25 °C the compressive strength could be regulated in the range 18–29 MPa at 95% strain, and it could be kept in the range 12–46 MPa within the temperature range −25 °C–110 °C. Increasing the proportion of GL, which has a high boiling point, the high and low temperature tolerance of the organogel was strengthened significantly. The EG served as a lubricant and enhanced the tensile recoverability from 77% to 84%. Overall, the properties of the organogel were the best when the GL:EG ratio was 70:30. The solvent-switchable organogel fabricated in this study is a good candidate for extending the field of application of gel materials.
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ENVIRONMENTAL SCIENCE & TECHNOLOGY
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2020
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IF 7.864
Ruiyang Zhang,Tao Ran,Yuehan Cao,Qian Zhang,Fan Dong,Guidong Yang,Ying Zhou
Catalysis oxidization has been known to be an effective technique in environmental remediation. However, low efficiency for oxygen activation and difficult recovery of the catalysts in powdery form significantly limit the practical application. In this work, a new-type monolithic α-Ni(OH)2/Ni-foam was fabricated by the hydrothermal process. We found that H atoms of α-Ni(OH)2 can significantly promote oxygen activation, which endows it with favorable NO and NO2 oxidization confirmed by theoretical calculation and in situ DRIFTS. Furthermore, the introduction of Ni foam accelerated the pollutant gas transfer and charge carriers’ separation because of its abundant porous structure and high conductivity and its monolithic property simplified the recycling operation. Consequently, the obtained α-Ni(OH)2/Ni-foam achieved an excellent NO oxidation (69.0%) and no toxic NO2 was detected under visible light illumination (λ > 420 nm), indicating its highly promising potential in environmental remediation. Our work provides a conceptually different fresh perception to promote oxygen activation for highly efficient gas purification.
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PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2020
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IF 10.652
Wei-Ming Yin,Yan Wang,Yu-Chang Hou,Yuan Sun,Ji-Guo Zhang,Hui-Liang Sun,Shu-Jun Li,Qing-Jiang Pan,Yuan-Ru Guo
The ever-growing contamination of water resources generated by heavy metals is posing significant threat to sustainable development, and urging the necessity of safe disposal. In this work, we designed a facile method to prepare carbon dots/Mg(OH) 2 (marked as CDs/Mg(OH) 2 ) composite, which enables to remove and recover potentially toxic metal of Cd 2+ from water. The newly-prepared CDs/Mg(OH) 2 features a hierarchical petaloid-array structure and has large specific surface area of 96.2 m 2 g −1 . It is evident that the composite is composed of Mg(OH) 2 slices, to which CDs are attached. Density functional theory calculation recognized the composite microstructure at the atomic level. Weak chemical coupling between sub-units were borne out by optimized structures, energetics, infrared vibrations, and electronic structures. The CDs/Mg(OH) 2 composite shows high removal capacity and long durability while treating Cd(II)-contaminated water. The incorporation of CDs could regulate and control the up-taking rate of Cd 2+ ions and consequently fabricate well-dispersed 1D nanowires of Cd(OH) 2 . The corresponding mechanism was proposed. Specifically, the sample CDs/Mg(OH) 2 -60 reaches 1015.4 mg g −1 removal capacity; it can be used for 12 cycles and still keep removal efficiency as high as 98.6%.
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RSC Advances
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2020
·Vol. 10
·期 13
·7619-7627
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IF 3.119
Chunmei Xiao,Jianming Lin
The existence of Pb(II) ions in water systems poses significant potential hazards to public health and the environment. In the present study, poly(2-acrylamido-2-methylpropanesulfonic acid) (PAMPS) brush-modified Ni3Si2O5(OH)4 nanotubes were prepared, and their adsorption efficiency against the Pb(II) ions was investigated. The characterization results of FTIR spectroscopy, TGA, TEM, and XPS indicated the successful grafting of PAMPS on the surface of free Ni3Si2O5(OH)4 NTs, and the prepared PAMPS-g-Ni3Si2O5(OH)4 NTs exhibited a 6–8 nm grafting layer, which could provide abundant binding sites for metal adsorption. During the Pb(II) removal process, a pH-dependent adsorption behavior was observed, and the adsorption processes fitted well with the pseudo-second-order kinetic model and the Langmuir isotherm model. Compared with unmodified Ni3Si2O5(OH)4, the PAMPS-g-Ni3Si2O5(OH)4 NTs exhibited obviously faster adsorption of Pb(II) and higher equilibrium adsorption capacity for the removal of Pb(II). The maximum adsorption capacity calculated via the Langmuir isotherm model was 0.653 mmol g−1 (135.3 mg g−1) at 298 K. In a metal coexisting system, the total adsorption capacity of the NTs was increased; this indicated the potential of the proposed NTs in the removal of Pb(II) from metal coexisting wastewater. This study showed the significant potential of PAMPS-g-Ni3Si2O5(OH)4 NTs in the effective removal of Pb(II).
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2020
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IF 4.939
Yun Zhou,Xigang Yang,Shengqi Xi,Bing He,Yongping Song
Alkaline solution is considered to be more suitable for industrial application of hydrogen production by water electrolysis . However, most of the low-cost electrocatalyts such as Ni 3 S 2 has poor ability to dissociate HO–H, resulting in unsatisfied hydrogen evolution performance in alkaline media . In this paper, a novel vermicular structure of Ni 3 S 2 –Ni(OH) 2 hybrid have been successfully prepared on nickel foam substrate ( v -Ni 3 S 2 –Ni(OH) 2 /NF) through a facile two-step containing hydrothermal and electrodeposition processes. The heterostructure consists of rod-like Ni 3 S 2 and Ni(OH) 2 nanosheets , in which Ni(OH) 2 is coated on the surface of Ni 3 S 2 . This structure not only constructs a fast electron transfer channel but also possesses rich heterointerface, thus accelerating the Volmer step and allowing more active sites of Ni 3 S 2 to functioning well. As a result, v -Ni 3 S 2 –Ni(OH) 2 /NF exhibited excellent electrocatalytic activity toward HER in 1.0 M KOH solution. It only needs 78 mV and 137 mV to drive current density of 10 mA cm −2 and 100 mA cm −2 . Moreover, the catalytic stability of this electrocatalyst in alkaline solution is also satisfactory.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2020
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IF 4.65
Yunlong Zhou,Dongyao Lin,Xiaoyuan Ye,Mingyuan Zhu
In this study, sulfur-doped Ni(OH) 2 was prepared by an immersion method at room temperature and used as an efficient co-catalyst for g-C 3 N 4 in photocatalytic hydrogen evolution . The structure, morphology, and elemental composition of the sulfur-doped Ni(OH) 2 /g-C 3 N 4 were characterized by X-ray diffraction, scanning electron microscopy, transmission electron microscopy , and X-ray photoelectron spectroscopy. These results proved that the sulfur-doped Ni(OH) 2 was successfully synthesized and combined with g-C 3 N 4 at the heterojunction . The photocatalytic hydrogen generation results of Ni(OH) 2 /g-C 3 N 4 (0 μmol g −1 h −1 ) and that of sulfur-doped Ni(OH) 2 /g-C 3 N 4 (1573.7 μmol g −1 h −1 ) indicate that the sulfur doping resulted in significant improvement in the catalytic activity of co-catalyst Ni(OH) 2 . Moreover, the possible mechanism of photocatalytic hydrogen evolution catalyzed by the sulfur-doped Ni(OH) 2 /g-C 3 N 4 was proposed. The results of photoluminescence , ultraviolet–visible diffuse reflectance spectroscopy , and electrochemical analysis demonstrated that the sulfur doping provided more active sites in Ni(OH) 2 , leading to the efficient hydrogen evolution reaction, thus indirectly enhancing the separation efficiency of electron–hole pairs and the migration efficiency of photogenerated electrons by the photocatalyst g-C 3 N 4 .
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CHEMICAL GEOLOGY
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2021
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IF 4.015
Fuwei Sun,Haibo Liu,Ziyang Chu,Peixun Zhai,Tianhu Chen,Hanlin Wang,Xuehua Zou,Dong Chen
To investigate the effect of isomorphic substitution on siderite activation of hydrogen peroxide, different X-substituted siderite (X = Mn, Co, Ca, and Mg) was artificially synthesized and utilized to activate hydrogen peroxide (H 2 O 2 ) over a pH range from 5 to 9. The results indicated that the addition of siderite generally accelerated the conversion process of H 2 O 2 to ·OH regardless of initial pH values. However, the conversion ability from H 2 O 2 to ·OH was only enhanced under the acidic condition. Then, X-substituted siderite generally enhanced the conversion rate and inhibited the capacity of H 2 O 2 to ·OH under neutral and alkaline conditions. The Mn, Ca, and Mg-substituted siderite facilitated both conversion rate and capacity of H 2 O 2 to ·OH under weakly acidic conditions, while Co-substituted siderite inhibited both compared to the raw siderite. The element substitution mainly affected the stability of siderite, which resulted in the dissolution of siderite to generate Fe 2+ and contributes to the H 2 O 2 decomposition and the ·OH generation. Findings from this research suggested that the isomorphic substitution of siderite had a non-negligible impact on the transformation of H 2 O 2 to ·OH.
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ACS Applied Materials & Interfaces
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2019
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IF 8.456
Jianbin Lin,Han Fang,Xianhua Tan,Bo Sun,Ziyi Wang,Huidan Deng,Huan Liu,Zirong Tang,Guanglan Liao,Tielin Shi
Humidity sensors have attracted intense interest in various fields because of the importance of humidity detection. Different methods have been adopted to enhance sensing performances of humidity sensors, while it is challenging for researchers to avoid the invalidation of the sensors after being wet. Here, we, for the first time, introduce self-assembly MoS2/Cu(OH)2 nanowires fabricated by liquid self-spreading–coating–evaporating as sensing materials and present MoS2/Cu(OH)2 nanowire-based quartz crystal microbalance gamut humidity sensors with superior sensitivity and self-recovery ability. The sensors deliver a remarkable sensitivity (60.8 Hz/% RH) under a wide range (0–97% RH) with fast response (1.9 s)/recovery time (3.8 s) and upgrade self-recovery ability that can maintain their original performances even after being wet, frozen, and heated or immersed in water. The sensors are also employed to monitor water counting, dew alarming, and human breathing (within 4 s), further showing their ultrahigh sensitivity for water molecules. The underlying humidity-sensing mechanism is interpreted by density functional theory calculations and in-situ Fourier transform infrared spectra experiments adequately, revealing that the high sensing performances are attributed to abundant adsorption sites and physisorption of water molecules. Our work proposes a strategy for transferring materials to arbitrary nanostructures swiftly and demonstrates new perspectives for highly sensitive humidity detection as well as self-recovery ability.
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CHEMICAL PHYSICS LETTERS
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2019
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IF 1.901
Zhuo Zhou,Haiming Xu,Dongya Li,Zhongwei Zou,Dongsheng Xia
La(OH) 3 /BiOCl n-n heterojunction (BCL) was successfully fabricated by facile microwave technique. Photocatalytic performance experiments confirmed that BCL-20 can degrade 20 mg/L tetracycline hydrochloride (TC-HCl) about 85% in 60 min, which is 2 and 0.5 times higher than that of BiOCl and La(OH) 3 , respectively. The photocatalytic mechanism reveals that the co-effect of oxygen vacancies (OVs) and rebuilt internal electric field induced by heterostructure not only broaden the light-responsive range but also augment the separation efficiency of photogenerated carriers, thus improving the photocatalytic properties of BCL. This work provides a new avenue for improving the photocatalytic performance of Bi-based photocatalysts by heterojunction and OVs.
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MATERIALS LETTERS
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2019
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IF 3.019
Hongqin Ma,Meijie Wang,Jiasheng Zhang,Shuai Sun
To circumvent the liquid-solid separation and dispersion of the powdered adsorbent during adsorption-desorption circulation, using a drop-oil sol-gel method, the spherical ZrO(OH) 2 /AlOOH hybrid composite beads were prepared as an adsorbent for sulfate adsorption removal from water. The preparation mechanism was proposed and discussed in term of the characterization results showing that the as-prepared beads is an amorphous mesoporous material constructed from nanoflakes composed of rod-like nanoparticles, and possesses a good sphericity, a relatively high specific surface area (195.56 m 2 /g) and adequate mechanic strength (Zr/Al(0.2)-30-3.5, 32.1 N). The adsorption tests indicated that the saturated adsorption capacity increases with sulfate concentration and decreases with prolongation of adsorbent drying time, owing to the reduction of water content, the maximum adsorption capacity can reach 205 mg/g (Zr/Al(0.2)-30-2). This work has a profound significance for the further research and industrial application of spherical adsorbent related to hydrate zirconia in fixed adsorption bed.
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