JOURNAL OF POWER SOURCES
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2023
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IF 9.2
Peng Wang,Tao Yu,Liping Hao,Xuanwen Liu
Efficient electrocatalysts are crucial for overcoming the sluggish kinetics of the oxygen-evolution reaction (OER) and facilitating the advancement of energy storage technologies such as metal-air batteries and hydrogen production through water electrolysis. This study proposes a synergistic approach combining amorphization and interfacial engineering to improve OER performance by fabricating heterojunctions between crystalline NiFe(OH) x and amorphous NiP x . The formation of a strongly coupled crystalline-amorphous heterojunction enables optimization of the electronic structure at the catalytic site and accelerates charge transfer at the interface, thereby improving the reaction kinetics. Notably, we investigate the dynamic adsorption behavior of PO 4 3− during the OER process by introducing Na 3 PO 4 into the electrolyte, revealing that P vacancies serve as active sites in promoting OER activity. Lastly, electrochemical measurements demonstrate that NiFe(OH) x /NiP x /NF exhibits a low overpotential of 220 mV at 10 mA cm −2 and Tafel slope of 35 mV·dec −1 , surpassing the performance of laboratory-prepared noble metal catalysts and most reported NiFe-based electrocatalysts.
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高影响因子
MATERIALS RESEARCH BULLETIN
·
2023
·
IF 5.4
Yujie Yang,Zhicheng Shi,Liang Liang,Yuan Yuan,Yao Liu,Runhua Fan
Currently, the application of polymer dielectric capacitors is largely limited by their low energy storage density. Herein, novel sandwich-structured composite films with simultaneously enhanced energy storage density and efficiency are fabricated, which combine outer layers of inorganic nanosheets Ni(OH) 2 /poly(vinylidene fluoride-co-hexafluoropropylene) (P(VDF-HFP)) with high permittivity and intermediate layer of polycarbonate (PC) with high breakdown strength. The trilayer film with only 1 vol% Ni(OH) 2 exhibits an excellent energy storage density of 7.322 J/cm 3 accompanied with a high efficiency of 72.1 % at 605 kV/mm, which are 120 % and 113 % of pure P(VDF-HFP). Furthermore, hindrance effect of micro-interfaces and macroscopical-interfaces on electrical trees is well revealed through finite element simulation. These excellent characteristics of composite films suggest that this design strategy is effective to realize concurrent high energy density and efficiency.
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高影响因子
APPLIED SURFACE SCIENCE
·
2023
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IF 6.7
Yu Wang,Yi Lu,Yiwei Shi,Jingjing Wang,Yingying Zheng,Jiaqi Pan,Chaorong Li,Jun Cao
Urea oxidation reaction (UOR) has been endorsed as an energy-saving approach for assisting hydrogen evolution, and Ni(OH) 2 -based catalysts has been widely used as efficient candidates for catalyzing UOR. However, the sluggish deprotonation process characterized by high energy barriers restricts the achievement of high efficiency. In this study, isoelectronic Co was introduced into Ni(OH) 2 by one-step hydrothermal reaction. The doped Co induced electrons located on Ni centre, and decreased the redox potential of Ni 2+ /Ni 3+ . Consequently, the performance of Ni(OH) 2 toward UOR was boosted, with the optimized 5 %Co-Ni(OH) 2 exhibiting the lowest potential of 1.357 V vs RHE at 100 mA cm −2 and outstanding stability operating over 100 h at 10 mA cm −2 . Moreover, a cell assembled by 5 %Co-Ni(OH) 2 /NF and Pt/C/NF outperformed better performance of urea electrolysis comparing with the commercial cell assembled by Pt/C/NF and RuO 2 /NF. Density functional theory (DFT) calculations revealed that the introduced Co regulated the electronic structure of Ni(OH) 2 , resulting in an optimized d-band centre. Moreover, the doped Co altered the initial adsorption coordination of urea molecules on NiOOH surface and reduced energy barrier for the consecutive deprotonation process (rate-determination step), which enhanced catalytic dynamic and subsequently led to a boosted performance toward UOR.
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高影响因子
Materials Science and Engineering B-Advanced Functional Solid-State Materials
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2023
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IF 3.6
Bairui Tao,Honglin Zheng,Jiao Li,Fengjuan Miao,Peng Zhang
The construction and development of enzyme-free sensors made of non-precious metals that are extremely sensitive to glucose is of great importance for treatment of diabetes. A room temperature reaction method was used to grow ZIF-67@GO nanocubes on nickel foam substrates, followed by a hydrothermal method to construct Co(OH) 2 nanomaterials . From this NF/ZIF-67@GO/Co(OH) 2 enzyme-free glucose sensor with a unique structure was designed. The results and the charge transfer process of glucose's catalytic oxidation detection were systematically investigated in the composite material. The experimental results show that this sensor exhibits good electrochemical activity for glucose detection. It has a linear range of 0.1 μM-8.546 mM, a very high sensitivity of 2412.7 μA mM −1 cm −2 , and its low detection limit is 0.934 M (signal-to-noise ratio of 3). These results indicate that the sensor is capable of accurately and sensitively detecting glucose concentration and has great potential for use in practical applications. The synthesis method is simple, fast, low-cost and easy to apply to electrochemical electrodes. Besides, the material has reproducibility, stability and good selectivity .
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高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2023
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IF 9.9
Houfeng Zhang,Bojing Sun,Junjie Wang,Qian Zhu,Dongfang Hou,Chen Li,Xiu-qing Qiao,Dong-sheng Li
Optimize the separation and transport mechanism of photogenerated carriers in heterojunction composites, and make full use of the active sites of each material are key factors to enhance photocatalytic activity. Herein, we successfully synthesize defective CdLa 2 S 4 @La(OH) 3 @Co 3 S 4 (CLS@LOH@CS) Z-scheme heterojunction photocatalysts through a facile solvothermal method, which show broad-spectrum absorption and excellent photocatalytic activity. La(OH) 3 nanosheets not only greatly increase the specific surface area of photocatalyst, but also can be coupled with CdLa 2 S 4 (CLS) and form Z-scheme heterojunction by converting irradiation light. In addition, Co 3 S 4 with photothermal properties is obtained by in-situ sulfurization method, which can release heat to improve the mobility of photogenerated carriers, and also be used as a cocatalyst for hydrogen production. Most importantly, the formation of Co 3 S 4 leads to a large number of sulfur vacancy defects in CLS, and thus improving the separation efficiency of photogenerated electrons and holes, and increasing the catalytic active sites. Consequently, the maximum hydrogen production rate of CLS@LOH@CS heterojunctions can reach 26.4 mmol g -1 h −1 , which is 293 times than pristine CLS (0.09 mmol g -1 h −1 ). This work will provide a new horizon for synthesizing high efficiency heterojunction photocatalysts through switching the separation and transport modes of photogenerated carrier.
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PubMed
高影响因子
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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高影响因子
Journal of Materials Chemistry A
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2019
·Vol. 7
·期 16
·9903-9911
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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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高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2019
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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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高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2019
·Vol. 30
·期 4
·879-888
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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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高影响因子
MATERIALS RESEARCH BULLETIN
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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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高影响因子
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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高影响因子
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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高影响因子
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