INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2020
·
IF 4.939
Hongmei Zhao,Tingting Zhang,Dongyu Shan,Ying Zhu,Ge Gao,Ye Liu,Jing Liu,Meiying Liu,Wansheng You
An intervening barrier for photocatalytic water decomposition and pollutant degradation is the frustratingly quick recombination of e − - h + pairs. Delicate design of heterojunction photocatalysts by coupling the semiconductors at nanoscale with well-matched geometrical and electronic alignments is an effective strategy to ameliorate the charge separation. Here a facile and environment-friendly l -cysteine-assisted hydrothermal process under weakly alkaline conditions is demonstrated for the first time to fabricate ZnIn 2 S 4 /In(OH) 3 hollow microspheres with intimate contact, which are verified by XRD, SEM, (HR)TEM, XPS , N 2 adsorption-desorption, UV–Vis DRS and photoluminescence spectra. ZnIn 2 S 4 /In(OH) 3 heterostructure (L-cys/Zn 2+ = 4, molar ratio) with a band-gap of 2.50 eV, demonstrates the best photocatalytic performance for water reduction and MB degradation under visible light, outperforming its counterparts (In(OH) 3 and ZnIn 2 S 4 ). The excellent activity of ZnIn 2 S 4 /In(OH) 3 heterostructure arises from the intercrossed band-edge positions as well as the unique hollow structure with large surface area and wide pore-size distribution, which are beneficial for the efficient charge migration from bulk to surface as well as at the interface between ZnIn 2 S 4 and In(OH) 3 . This work provides an efficient and eco-friendly strategy for one-pot synthesis of heterostructured composites with intimate contact for photocatalytic application.
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高影响因子
CRYSTENGCOMM
·
2021
·Vol. 23
·期 37
·6518-6525
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IF 3.545
Qi-Ming Qiu,Guo-Yu Yang
Three new mixed-alkaline-metal borates, namely KNa8[Li@B12O18(OH)6](CO3)2 (1), Cs10[Li@B12O20(OH)2]2·6H2O (2) and Cs5[Li@B12O20(OH)2]·3H2O (3), have been synthesized under hydro/solvothermal conditions. Compound 1 is a borate carbonate with the isolated [Li@B12O18(OH)6]5− clusters and interesting layers formed by Na+ and CO32− ions, forming a 2D supramolecular structure with a 3,6-connecting binodal system. After changing the synthetic conditions, the isolated [Li@B12O18(OH)6]5− clusters are successfully extended to the layers in 2 and 3 by condensation reactions with the elimination of water molecules between oxoboron clusters. Each new fundamental building block [Li@B12O22(OH)2]9− in 2 and 3 connects with four neighboring units to form a 2D layer via B–O–B bonds for the first time, and 14-membered rings are also observed. Such a layer structure is first observed in dodecaborates. Since compound 3 crystallizes in the non-centrosymmetric space group, the second harmonic generation measurement and the dipole moments calculation have been carried out.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2021
·
IF 5.816
Hui Wang,Lei Lu,Palaniappan Subramanian,Shan Ji,Palanisamy Kannan
Developing a highly active, low-cost, and durable nanostructured catalytic material is of significant interest in fuel cell applications owing to its efficient energy conversion, ease of preparation and operation, and reduced emission of pollutants. In this work, various ratio (0.01, 0.03, and 0.05 mmol) of cobalt (Co), and iron (Fe) doped nickel hydroxide (Ni(OH) 2 ) nanosheet arrays were grown on Ni foam surface (Co–Ni(OH) 2 and Fe–Ni(OH) 2 ) via a simple one-step process. The Co–Ni(OH) 2 and Fe–Ni(OH) 2 nanosheet array on Ni foam electrodes were explored as potential candidate towards electro-oxidation of urea. Notably, 0.03 mmol Co doped Ni(OH) 2 /Ni foam electrode displayed lowest-onset oxidation potential (0.21 V) and enhanced electro-oxidation of urea (59.7 mA) owing to its large amount of electrocatalytic active sites, densely assembled nanosheet array structures with porous surfaces, and electronic diffusion channels, which might promote interface electrochemical reaction . In addition, synergistic effect between Co metal with Ni(OH) 2 has also promotes enhanced electro-oxidation of urea in contrast to Fe–Ni(OH) 2 nanosheet array, Ni(OH) 2 , and Ni foam electrodes. Chronoamperometric i-t curve of Co–Ni(OH) 2 /Ni foam electrode obviously exhibited higher catalytic current, highly stable and durable properties in contrast to Fe–Ni(OH) 2 nanosheet arrays. As-fabricated Co–Ni(OH) 2 /Ni foam can be explored as a new type of potential low-cost catalyst for electro-oxidation of urea, which reveals promising use in future fuel cell energy applications .
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MATERIALS RESEARCH BULLETIN
·
2019
·
IF 3.355
Hongjun Fang,Yusong Pan,Minyuan Yin,Chengling Pan
It is an effective method to explore full spectrum responsive photocatalyst for improving their photocatalytic activity. Herein, Ti 3 C 2 −OH/Bi 2 WO 6 :Yb 3+ , Tm 3+ composites were successfully synthesized via a facile hydrothermal method. The resultant Ti 3 C 2 −OH/Bi 2 WO 6 :Yb 3+ , Tm 3+ composites accompanied 2D/2D heterojunction with grid-like porous structure present a significant enhancement of photoactivity towards degradation of RhB under visible and NIR light irradiation. Specifically, the 0.2-Y/T-TB2.8 composite exhibits the best photocatalytic activity for RhB removal, in which the RhB degradation efficiency was 99.8% (Vis-NIR, 30 min), 91% (Vis, 30 min), and 48% (NIR, 160 min). The excellent photocatalytic activity of the composite is attributed to the grid-like porous structure endowing it with an enhanced RhB adsorption, favorable charge separation resulting from the outstanding conductivity of the Ti 3 C 2 −OH, and up-conversion mechanism via energy level transition of Yb 3+ /Tm 3+ . In addition, the radical capture experiments verified that the hole (h + ) plays the important role for degradation of RhB.
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ACS Omega
·
2019
·
IF 2.584
Bo Cao,Chunhua Luo,Jie Lao,Hanqing Chen,Ruijuan Qi,Hechun Lin,Hui Peng
Layered cobalt hydroxides are cost-efficient electrocatalysts for oxygen evolution reaction (OER) in the field of energy conversion. Herein, we developed a facile synthesis method of 3d transition-metal-doped α-Co(OH)2 nanomaterials mediated with ammonia in water–methanol at room temperature. The doping of Cu2+ and Ni2+ leads to flower-like nanostructures similar to pure α-Co(OH)2, whereas the doping of Fe2+ produces nanoparticles with more than 2 times larger surface area in comparison with the Cu2+- and Ni2+-doped nanoflowers. The obtained dispersion with the addition of Nafion can be used directly as an electrocatalyst for OER with excellent catalytic activity, especially that the overpotential of Fe2+ doped is as low as 290 mV at 10 mA cm–2 and the turnover frequency is improved by 3 times as compared with that of α-Co(OH)2. Furthermore, the catalyst can be loaded onto foam nickel, which presents excellent durability with the current density unchanged under continuous chronoamperometry reaction for as long as 12 h and almost quantitative faradaic efficiency. The superior electrocatalytic properties combined with the simple synthesis without the tedious purification procedure is very promising for OER.
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PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Ruiyang Zhang,Tao Ran,Yuehan Cao,Liqun Ye,Fan Dong,Qian Zhang,Lizhi Yuan,Ying Zhou
Photocatalytic NO x removal is regarded as a promising technique for air purification in recent years. However, NO x removal process usually accompanies with toxic NO 2 generation, leading to serious secondary pollutant and limiting its practical application. Herein, a noble-metal-free g-C 3 N 4 /α-Ni(OH) 2 photocatalyst was fabricated through hydrothermal method. The introduction of α-Ni(OH) 2 microspheres combines with g-C 3 N 4 , resulting in an enlarged surface area from 35 to 95 m 2 /g, while the unique structure of α-Ni(OH) 2 broadens visible-light response range and accelerates photogenerated charge carriers transfer. More importantly, the H atoms of α-Ni(OH) 2 improve the adsorption and activation of O 2 and oxygen atoms to promote NO and NO 2 oxidized to nitrate. Consequently, g-C 3 N 4 /α-Ni(OH) 2 shows enhanced NO removal ratio of 51.3% without any toxic NO 2 generation, indicating its great potential for air purification. Our results provide fresh insight into the design of highly efficient and safe photocatalyst for toxic byproduct control in the application of environmental remediation.
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POLYMERS FOR ADVANCED TECHNOLOGIES
·
2019
·Vol. 30
·期 4
·879-888
·
IF 2.162
Rui Gao,Shuguang Wang,Keqing Zhou,Xiaodong Qian
In the present work, a facile and environmental method was developed to fabricate the novel functionalized MoS 2 hybrid. Firstly, MoS 2 nanosheets were coated with polydopamine (PDA) through the self-polymerization of dopamine (MoS 2 -PDA) in a buffer solution. Then the decoration of Ni(OH) 2 on the MoS 2 -PDA was synthesized because of the strong affinity of Ni 2+ with hydroxyl groups in PDA. Finally, the as-synthesized MoS 2 -PDA@Ni(OH) 2 was introduced into poly(lactic acid) (PLA) matrix to explore flame retardancy, thermal stability, and crystalline property of the composites. As confirmed by X-ray diffraction (XRD), Fourier-transform infrared spectrometer (FTIR), transmission electron microscopy (TEM), scanning electron microscopy (SEM), and thermogravimetric analysis (TGA), the MoS 2 nanosheets were dually modified with PDA and Ni(OH) 2 without destroying the original structures. The thermal degradation of PLA with MoS 2 -PDA@Ni(OH) 2 generated a notably higher yield of char. Moreover, the crystallization rate of composites is higher than neat PLA. The cone calorimeter test revealed that the introduction of 3% MoS 2 -PDA@Ni(OH) 2 resulted in lower Peak Heat Release Rate (PHRR) (decreased by 21.7%). Thus, the research provided an innovative functionalization method for manufacturing PLA composites with high performances.
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APPLIED SURFACE SCIENCE
·
2019
·
IF 5.155
Qingfeng Zhou,Yun Gong,Keyu Tao
Herein, the 2D NiCl(OH) nanosheets and 2D V-doped NiCl(OH) nanoplates assembled by 3D nanosheet arrays supported on nickel foam have been successfully synthesized by a facile one-pot hydrothermal reaction . The dependences of the microstructure and electrochemical performance on hydrothermal reaction time and reactant concentration were investigated, and the electrochemical performance was optimized at 12 h and C Ni 2+ = 0.15 mM. A series of characterization results reveal that the as-prepared V-doped NiCl(OH) nanoplate arrays are successfully grown on nickel foam, and these nanoplates are composed of interconnected ultrathin nanosheets. The thickness of the as-obtained nanosheets increases with increasing reaction time, and the thickness of the optimized nanosheets is about ~20 nm. Vanadium dopant is used as the template agent to alter the morphology of NiCl(OH) nanosheet arrays and form the V-doped NiCl(OH) nanoplate arrays, then leading to a higher specific surface area and lower charge transfer resistance. The cost-effective, binder-free and optimized V-doped NiCl(OH) delivers the high specific capacitances of 2753.3 and 1470.0 F g −1 at the current densities of 1 and 30 mA cm −2 , respectively. Meanwhile, an asymmetric supercapacitor is constructed with the optimized V-doped NiCl(OH) sample as the positive electrode and activated carbon as the negative electrode. The fabricated device can exhibit a high energy densities of 45.5 W h kg −1 at the power density of 799.5 W kg −1 in the voltage window of 0–1.6 V. The efficient electrochemical performance of 3D V-doped NiCl(OH) nanoplate arrays makes it a favorable candidate for supercapacitor electrode material .
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Journal of Materials Chemistry A
·
2019
·Vol. 7
·期 16
·9903-9911
·
IF 10.733
Kun Wang,Qilu Yao,Shaojun Qing,Zhang-Hui Lu
Hydrous hydrazine (N2H4·H2O) is considered to be a promising chemical hydrogen storage carrier due to its high hydrogen content (8.0 wt%), production of only N2 in addition to H2, and facile recharging as a stable liquid. In this work, for the first time, CoPt NPs supported on La(OH)3 are used as a highly effective catalyst for selective decomposition of N2H4. Surprisingly, the La(OH)3 nanosheet-supported CoPt NPs exhibit superior catalytic performance, releasing 3 equiv. (H2 + N2) with turnover frequency (TOF) values of up to 734.2 h−1 at 303 K and 2400 h−1 at 323 K; these are higher than those of most reported catalysts for the dehydrogenation of N2H4. Especially, CoPt/La(OH)3 can be easily separated from the reaction solution using a magnet due to its super-paramagnetic nature, and it can maintain its high activity and 100% selectivity even after five cycles. The high performance of CoPt/La(OH)3 can be attributed to the electronic interaction between Co and Pt, strong basic sites on the surface of La(OH)3 and a synergistic cooperative effect between the ultrafine CoPt NPs and the La(OH)3 support. The development of a high performance Co-based catalyst may promote the effective application of hydrous hydrazine as a promising hydrogen storage material.
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APPLIED SURFACE SCIENCE
·
2019
·
IF 5.155
Yi Han,Hongdong Li,Mingjuan Zhang,Yunlei Fu,Yanru Liu,Yu Yang,Jixiang Xu,Yanling Geng,Lei Wang
The development of relatively inexpensive and highly active electrocatalyst for water splitting is essential to the energy conversion and sustainable economic improvement. In this work, based on nanostructure engineering, the CoSe 2 -Ni 3 Se 2 nanoparticles coated Co(CO 3 ) 0.5 (OH)·0.11H 2 O nanoneedles supported on the surface of Ni foam (NF) composite (CoSe 2 -Ni 3 Se 2 /NF) had been synthesized by a facile hydrothermal selenization method. Benefiting from the adequate nanostructure and moderate degree of selenization treatment, the obtained sample CoSe 2 -Ni 3 Se 2 /NF-0.4 using 0.4 g Se powder as selenium source shows remarkable electrocatalytic performance and electrochemical stability for either hydrogen evolution reaction (HER) or oxygen evolution reaction (OER). CoSe 2 -Ni 3 Se 2 /NF-0.4 only required 98 mV (vs. RHE) to reach the 10 mA cm −2 for HER and 344 mV (vs. RHE) to reach 100 mA cm −2 for OER in 1.0 M KOH solution. This work provides a simple strategy to controllably synthesize transitional metal diselenium-based electrocatalyst with adjustable amount of active phase, which are very important for the future development of the bifunctional electrocatalyst.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2019
·
IF 4.084
Huasheng Jiang,Zining Wang,Palanisamy Kannan,Hui Wang,Rongfang Wang,Palaniappan Subramanian,Shan Ji
Metal/metal hydroxide hybrid heterostructures exhibits superior performances in diverse research fields, especially in catalysis due to the presence of ample grain boundary interfaces and the strong metal/metal hydroxide synergistic actions. Herein, Co(OH) 2 -Ni hybrid heterostructures with a crystalline Ni and Co(OH) 2 is prepared on the cotton fabric substrate by a simple electrochemical process . The Co(OH) 2 -Ni hybrid heterostructures are explored as a highly active catalyst for the electro-oxidation of hydrazine in an alkaline medium . The existence of ample grain boundary interfaces and promotional synergistic effect between the nanocrystalline metallic Ni and Co hybrid heterostructures lead to a very low-onset hydrazine oxidation potential of −0.06 V vs RHE. Moreover, the Co(OH) 2 -Ni hybrid heterostructured electrode exhibits excellent long-term catalytic stability.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2019
·
IF 3.375
Zhongde Wang,Wei Kong,Lianxi Si,Junjian Niu,Ye Liu,Longping Yin,Zhigang Tian
A superhydrophobic and superoleophilic material-modified stainless-steel (SS) mesh filter was successfully fabricated by the deposition of hierarchical butterfly-like micro/nanostructured Co(OH)2 on the SS mesh with the unipolar pulse electrodeposition method, followed by modification with hexadecyltrimethoxysilane (HDTMS) and applied to the separation of hot and corrosive oil/water mixtures. The obtained Co(OH)2/HDTMS SS mesh filter exhibited both superhydrophobicity (water contact angle as high as 157.9°) and superoleophilicity (oil contact angle of 0°) and excellent performance for the separation of oil/water mixtures under high temperature (up to 160 °C) and corrosive and ultrasonic conditions with long-term storage and reusability. It is expected that the present fabrication process could be applied to tuning the robust and thermally stable micro/nanostructures on the porous substrates for the oil/water separation under harsh conditions.
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危险品化学品经营许可证（带存储）