RSC Advances
·
2017
·Vol. 7
·期 79
·50358-50366
·
IF 3.108
Yue Wang,Xianfeng Zhang,Xin Li,Yang Liu,Xiaoping Wang,Xi Liu,Jian Xu,Yongwang Li,Yongguang Liu,Hang Wei,Peng Jiang,Minghui Liang
Iron oxide nanoparticles intercalated in Ni(OH)2 nanosheets were prepared in a spontaneous way for the cathode materials of asymmetric supercapacitors. The soluble precursor of Ni(OH)2, Ni(NH3)6(OH)2, was used for growth on α-Fe2O3 nanoparticles. The loading percentages of Ni(OH)2 in the Ni(OH)2–α-Fe2O3 nanocomposites had a great influence on the morphology and size of Ni(OH)2. The composites were characterized by TEM, SEM, ICP-OES, XRD and XPS. The specific capacitance of Ni(OH)2 in the composite can reach 1107 F g−1 at a scan rate of 20 mV s−1, and the specific capacitance of the Ni(OH)2–α-Fe2O3 composite can be up to 376 F g−1 at a scan rate of 5 mV s−1. More importantly, the fabricated Ni(OH)2–α-Fe2O3//AC (activated carbon) asymmetric supercapacitor exhibited energy density and power density of 31.6 W h Kg−1 and 474 W Kg−1, respectively. The cycling performance of the asymmetric supercapacitor was also excellent, and the capacitance retention reached 89.6% after 5000 charge–discharge cycles. Red, blue and yellow LED lights can be lit up with two series of asymmetric supercapacitors, revealing their potential application in energy storage.
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Journal of Cleaner Production
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2017
·
IF 5.715
De-Bin Li,Yun-Quan Liu,Yue-Yuan Ye,Shui-Rong Li,Duo Wang
Experiments were conducted to elucidate the mechanism of reaction between guaiacol and Ca(OH) 2 in water based on in situ FT-IR, 1 H NMR, ICP-AES and TGA analyses. Three phases were revealed for this reaction when guaiacol was dropped into the solution of Ca(OH) 2 , and the final molar ratio of guaiacol to Ca 2+ reaches 4. It was found that an acid–base reaction occurs in the first reaction phase. However, the second reaction phase includes not only the acid-base reaction, but also the accompanied coordination reaction between oxygen atom of hydroxyl group in guaiacol and Ca 2+ . The third reaction phase is also the coordination reaction, particularly, the one between the hydrogen atom in guaiacol and Ca 2+ . Based on the mechanism study, a novel circulating precipitation agent was developed and tested for the extraction of phenolic compounds from the simulated wastewater. The result showed that 96.63% guaiacol could be extracted from the simulated wastewater with the novel extraction technology at the optimum reaction conditions.
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FUEL
·
2017
·
IF 4.601
Zhuqian Xiao,Yu Fan,Yongjie Cheng,Qiang Zhang,Qing Ge,Ruyi Sha,Jianbing Ji,Jianwei Mao
The catalytic transformation of cellulose to polyols is one of the significant strategies to overcome the shortage of fossil fuels. Here we report a simple but effective preparation method for Ni-W/SiO 2 catalysts by introduction of chelating agents (ammonium hydroxide and ethanediamine) coupled with organic reducing agent (ethylene glycol). The ethylene glycol (EG) yield from microcrystalline cellulose could reach up to 63.3% at 240 °C, 5.0 MPa H 2 for 2.0 h over 15%Ni-20%W/SiO 2 -EEG catalyst. Moreover, some key parameters of process conditions including calcining temperature, reaction temperature and time, H 2 pressure and the recycling use of catalysts were investigated. Both theoretical and experimental studies suggested that 15%Ni-20%W/SiO 2 -EEG catalyst showed the best activity and stability for cascading steps for EG formation at this reaction condition. By the detailed analysis of Ni-W/SiO 2 catalysts after calcination via FT-IR, XRD , XPS , thermogravimetry (TG), TEM and element mapping, it could be concluded that on the surface of 15%Ni-20%W/SiO 2 -EEG catalyst, the particles showed less agglomeration and more homogeneous on the surface of SiO 2 . Some Ni x W y alloys (NiW, Ni 2 W 4 C) were also formed. Furthermore, it was found that the introduction of ethanediamine could promote the actual loading of nickel and tungsten species slightly according to the analysis of ICP-OES test.
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DALTON TRANSACTIONS
·
2024
·Vol. 54
·期 1
·144-151
·
IF 3.5
Yuan Rui,Zong Li,Miaohui Wang,Yunxia Liu,Haiping Lin,Peipei Huang,Qing Li
Developing electrocatalysts with fast reaction kinetics for the urea oxidation reaction (UOR) in the field of sustainable hydrogen production through urea-assisted water splitting remains challenging. Here, Ni1−xO/Ni(OH)2 supported on nickel foam (Ni1−xO/Ni(OH)2/NF) is prepared via a defect engineering strategy by combining Zn doping and acid etching. The doped Zn species are partially removed, facilitating the formation of NiOOH during acid etching. Residual Zn species modulate the electronic structure of nickel sites, which intrinsically accelerate the reaction kinetics of Ni1−xO/Ni(OH)2/NF. Ni1−xO/Ni(OH)2/NF exhibits excellent performance for the UOR with a low potential of 1.346 V versus the reversible hydrogen electrode to attain 100 mA cm−2, fast reaction kinetics (18.7 mV dec−1), and excellent stability in an alkaline electrolyte. The enhanced reaction kinetics of Ni1−xO/Ni(OH)2/NF are clearly elucidated by operando electrochemical impedance spectroscopy and in situ Raman spectroscopy. Our study offers an effective approach for designing promising Ni-based UOR catalysts for the practical application of urea-assisted water splitting.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2017
·
IF 5.401
Liying Sheng,Zhenjiang Li,Alan Meng,Qinhai Xu
The novel nanocomposite of Ni(OH) 2 nanoparticles over reduced graphene oxide and poly (3,4-ethylenedioxythiophene) hybrid film (Ni(OH) 2 @PEDOT-rGO) have been successfully fabricated via a facile, scalable and easy-to-control electrodeposition method. The characterization results of scanning electron microscope (SEM) and electrochemical techniques show that Ni(OH) 2 nanoparticles with an average particle size about 10 nm are uniformly deposited on PEDOT-rGO hybrid film with rough surface and reveal outstanding performance for detecting glucose. The enzyme-free glucose sensor exhibits an ultrafast response time (< 1 s), a wide linear range (0.002–7.1 mM), a low detection limit (0.6 μM) and a high sensitivity (346 μA mM −1 cm −2 ). Moreover, the sensor also displays superb selectivity, excellent reproducibility and good stability. The outstanding properties of the sensor may be attributed to the synergistic effect of Ni(OH) 2 nanoparticles possessing high electro-catalysis activity and PEDOT-rGO having well conductivity. More importantly, the sensor was successfully used to determine glucose in the real samples. In addition, the mechanism of electrodeposited PEDOT-rGO and glucose oxidase was investigated.
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JOURNAL OF NANOPARTICLE RESEARCH
·
2014
·Vol. 16
·期 9
·1-9
·
IF 2.278
Cui Hongtao,Xue Junying,Ren Wanzhong,Wang Minmin
In this work, β-Ni(OH) 2 monolayer nanosheets were prepared in benzyl alcohol by a facile exfoliation-free sol–gel route. The hydrolysis reaction of metal ions was started with the ring-opening reaction of epoxide. The in situ modification of benzyl alcohol molecules on the surface of secondary growth unit of hydroxide allowed the formation of β-Ni(OH) 2 monolayer nanosheets and 100 % monolayer state of β-Ni(OH) 2 in the resultant suspension. As proven in the electrochemical measurement, the maximum specific capacitance of 1735 F g −1 was obtained at scan rate of 5 mV s −1 within potential window of 0.6 V in 6 mol l −1 KOH aqueous solution, which is equal to the theoretical value of β-Ni(OH) 2 . This high electrochemical performance is attributed to the complete exposure of every structure unit of β-Ni(OH) 2 to electrolyte. This work demonstrates that monolayer nanosheets can generate from the brucite-type nickel hydroxide through this bottom-up strategy although it had been theoretically considered to be impossible.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2024
·
IF 8.1
Jin Yue,Sun Liping,Wang Yuechen,Huo Lihua,Zhao Hui
Electrocatalytic nitrate reduction reaction (NO 3 RR) provides a promising method for ammonia (NH 3 ) producing. It is urgent to develop efficient catalysts with improved NO 3 RR performance. In this paper, Cu 3 P@Co(OH) 2 /CF heterostructure catalyst is constructed by electrodeposition of cobalt hydroxide (Co(OH) 2 ) nanosheet on the surface of copper phosphide (Cu 3 P) nanorod , and used as a self-supporting cathode for electrocatalytic reduction of nitrate to ammonia. The NH 3 yield reaches 0.19 mmol h −1 cm −2 at a potential of −0.17 V vs. RHE, and the faraday efficiency (FE) is 86.7 %. The study manifests that the built-in electric field generated at the p-n heterojunction interface optimizes the electron migration kinetics, and promotes the adsorption of nitrate and the convention of intermediate product NO 2 − into ammonia. As a consequence, the selectivity of NH3 is improved. The Zn-nitrate battery is assembled with the designed catalyst as the cathode, to reach a peak power density of 5.16 mW cm −2 . The prepared catalyst realizes three effective functions: power output, ammonia synthesis , and nitrate pollutants treatment.
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CONSTRUCTION AND BUILDING MATERIALS
·
2024
·
IF 7.4
Jian Jia,Mei-Ling Xu,Xiao-Jie Jiang,Li-Na Zhang,Xiao-Lei Lu,Jiang Zhu,Xin Cheng
The utilization of cement-stabilized iron tailings as pavement base necessitates rigorous scrutiny of heavy metal ion leaching, particularly under fluctuating environmental pH conditions. Given the insufficient capacity of cement to stabilize Cr(Ⅵ), this paper explores the integration of defect-engineered metal-organic frameworks (MOFs) as additives in cement-stabilized iron tailings to reduce Cr(Ⅵ) leaching. Results shows that the utilization of MOFs material mitigates Cr(VI) leaching in cement-stabilized iron tailings while enhancing their mechanical properties. The Cr(Ⅵ) leaching from samples with the addition of UiO-66-(OH)₂ and UiO-66-(OH)₂-D exhibited a substantial reduction of 60.2 % and 88.6 %, respectively. The stabilized mechanism is attributed to the strong affinity between Cr(Ⅵ) and hydroxyl groups in MOFs. Furthermore, UiO-66-(OH) 2 -D has a larger pore diameter to expose more hydroxyl groups, which greatly improves its adsorption performance for Cr(Ⅵ). Meanwhile, the unconfined compressive strength (UCS), splitting strength and compressive resilience modulus increased by 13.4 %, 35.1 % and 45.7 %, respectively. The mechanisms underlie that the MOFs enhanced the early hydration process and optimized of the pore size distribution within the solidified body. This study presents a viable and efficient approach for the sustained mitigation of Cr(Ⅵ) leaching within cement-stabilized iron tailings.
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Journal of Energy Chemistry
·
2024
·
IF 14
Peiyun Zhou,Haokun Pan,Guangtong Hai,Xiang Liu,Xiubing Huang,Ge Wang
In this work, nickel foam supported CeO 2 -modified CoBDC (BDC stands for terephthalic acid linker) metal-organic frameworks (NF/CoBDC@CeO 2 ) are prepared by hydrothermal and subsequent impregnation methods, which can be further transformed to NF/CoOOH@CeO 2 by reconstruction during the electrocatalytic test. The obtained NF/CoOOH@CeO 2 exhibits excellent performance in electrocatalytic oxidation of 5-hydroxymethylfurfural (HMF) because the introduction of CeO 2 can optimize the electronic structure of the heterointerface and accelerate the accumulation of *OH. It requires only a potential of 1.290 V RHE to provide a current density of 50 mA cm −2 in 1.0 M KOH + 50 mM HMF, which is 222 mV lower than that required in 1.0 M KOH (1.512 V RHE ). In addition, density-functional theory calculation results demonstrate that CeO 2 biases the electrons to the CoOOH side at the heterointerface and promotes the adsorption of *OH and *HMF on the catalyst surface, which lower the reaction energy barrier and facilitate the electrocatalytic oxidation process.
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CHEMICAL PHYSICS
·
2024
·
IF 2
Xiaoxuan Li,Ying Lv,Zhifei Sun,Xuelian Chen,Meixia Xiao,Zhiru Li
Defect engineering, particularly oxygen vacancy introduction, enhances photocatalytic material performance by regulating light response and charge carrier utilization, while providing active sites. This project investigates oxygen vacancies in Bi 2 O 2 [BO 2 (OH)] for Rhodamine B and levofloxacin degradation. Findings show that 10 min of UV irradiation optimizes photocatalytic efficiency through oxygen vacancy activation, improving light absorption and charge carrier efficiency, leading to effective degradation of levofloxacin. This study establishes a link between photo-induced oxygen vacancies and photocatalytic performance, offering insights for developing efficient photocatalysts and managing antibiotic pollution.
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CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Jie Liu,Tongxu Gu,Rui sun,Jiaojiao Sun,Jian Yin,Pengli Bai,Huancai Yin
Classical gold nanoparticle-based colorimetric immunochromatographic assay (ICA) exhibits moderate performance, limiting their application in trace detection. In this study, perovskite-MSN nanocomposites with high quantum yield (74.7 %), a narrow full width at half maximum (29.5 nm) and excellent water stability were synthesized using in situ crystallization growth and a water-assisted strategy. Carboxyl-modified perovskite-MSN nanocomposites were employed to label anti-gliadin monoclonal antibody (mAb) and construct dual-mode fluorescent ICA (FICA) for determination of gliadin in milk and beef samples. Compared to the traditional AuNP-based colorimetric ICA strips, the CsM-H-based FICA demonstrated improved sensitivity, with a limit of detection (LOD) of 3.62 ng/mL in quantitative analysis. The CsM-H-based FICA strips exhibited average recoveries ranging from 90.2 % to 110.0 %, with coefficients of variation (CVs) between 3.3 % and 7.4 % for milk and beef samples. The ultra-stable perovskite-MSN nanocomposites provided the FICA strip with excellent stability, enabling storage for up to six months at room temperature. This study highlights the advantages of CsM-H-based FICA, including its rapidity, simplicity, and cost-effectiveness, as a promising POCT biosensor.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2024
·
IF 7.7
Liwen Shen,Feiyang Zhao,Huijuan Liu,Jicheng Li,Yang Lu,Jun Liu,Nianzhao Gao,Shuangfei Xiang,Shujun Zhao,Guocheng Zhu,Parpiev Khabibulla,Juramirza Kayumov,Feiya Fu,Xiangdong Liu
The agricultural industry produces a substantial volume of rice straw (RS) annually, highlighting the importance of recycling RS for sustainable materials. However, the poor interfacial compatibility between RS and polymers often leads to drawbacks in their composites, such as water-swelling and limited tensile strength. Here, we propose a novel approach using Ca(OH) 2 that offers several distinct advantages: enhancement of interfacial compatibility, elimination of the need for water washing, and formation of calcified hybrid particles on fiber surfaces by capturing CO 2 from the atmosphere. The non-washing calcified rice straw (NCRS) fibers were used to fabricate composites with unsaturated polyester resin (UPR), resulting in NCRS/UPR composites exhibiting significant enhancements in water resistance and mechanical properties compared to RS/UPR composites. The NCRS/UPR composites achieved a water absorption rate below 25 %, thickness swelling rate below 10 %, and tensile strength of 19.9 MPa. This work comprehensively explored the mechanism underlying these achievements through experimental studies. Findings suggest that CaCO 3 particles involving with released lignin act as an interfacial bridge between RS fiber surface and UPR, resulting in significantly improved properties. This approach demonstrates promising prospects as a simple and eco-friendly methodology for manufacturing RS-based composite materials.
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