CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Chengfeng Yi,Jingwen Li,Jiarui Li,Bingchuan Xue,Xing Lin,Zhigang Liu
The electrocatalytic oxidation of 5-hydroxymethylfurfural (HMF) to 2,5-furandicarboxylic acid (FDCA) constitutes a pivotal pathway for biomass valorization. However, its advancement is kinetically hindered by the competitive adsorption between HMF and OH − on active sites, causing a conflict between substrate activation and oxidant supply. To circumvent this impediment, a series of Ni(OH) 2 /N,W-Ni 3 S 2 composite catalysts are designed via electrodeposition. This strategy enables the in-situ growth of amorphous Ni(OH) 2 overlayer on the nitrogen and tungsten co-modulated Ni 3 S 2 (N,W-Ni 3 S 2 ) substrate, realizing the precise construction of heterostructure. The Ni(OH) 2 component possesses strong affinity for OH − , while the Ni 3 S 2 substrate preferentially adsorbs HMF. By tuning the electrodeposition duration, the Ni(OH)₂ layer thickness can be regulated, thereby enabling the overall adsorption strengths of both HMF and OH − to be finely optimized. The superior catalyst, Ni(OH) 2 /N,W-Ni 3 S 2 –500, demonstrates exceptional catalytic activity, achieving 100 % HMF conversion, 97.2 % FDCA yield and 97.3 % Faradaic efficiency. Furthermore, it displays a wide operational potential window, maintaining FDCA yields and Faradaic efficiencies above 90 % over 1.45–1.60 V vs. RHE. This remarkable activity is attributed to an optimized adsorption behavior for HMF and OH − . Specifically, the enhanced affinity for OH − accelerates the generation of the true active species, high-valent nickel oxyhydroxide (NiOOH), and ensures a sufficient localized supply of the oxygen source. Simultaneously, the catalyst retains a moderate adsorption capacity for HMF molecules, ensuring effective substrate activation without inhibiting product desorption. This study proposes a novel and effective interfacial engineering paradigm to resolve the adsorption imbalance in biomass electrooxidation, offering a rational blueprint for superior electrocatalysts.
研究领域:
催化化学
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电化学
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能源材料
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环境科学
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纳米材料
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界面工程
·
可持续化学
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高影响因子
NANOTECHNOLOGY
·
2021
·Vol. 32
·期 34
·345706
·
IF 3.874
Leqiu He,Yan Wang,Yajie Guo,Guobing Li,Xubin Zhang,Wangfeng Cai
Novel core−shell nanostructure electrodes benefit from the excellent properties of their constituent materials, as well as the synergy between them. However, it is challenging to fabricate such structures efficiently. In this study, NiSe nanorods were fabricated using Ni foam as the conductive substrate and reactant via a one-step hydrothermal process, and Ni(OH)2 nanosheets were coated on the surface of the nanorods via one-step electrodeposition. The effect of the structure and morphology on the properties of the material was explored using scanning electron microscopy, x-ray diffraction, and electrochemical technology. The obtained core−shell NiSe/Ni(OH)2 exhibited an areal capacity of 1.89 mAh cm−2 at a current density of 5 mA cm−2. The assembled NiSe/Ni(OH)2//AC hybrid supercapacitor exhibited excellent energy and power densities, indicating that NiSe/Ni(OH)2 has great potential for use as a battery-type electrode in energy storage systems.
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高影响因子
MATERIALS & DESIGN
·
2023
·
IF 8.4
Wenbin Shi,Nijia Song,Yanping Huang,Wenjie Wang,Chao He,Weifeng Zhao,Changsheng Zhao
Hydrogel treatment as a common cooling method could effectively ease pain and promote wounds healing by reducing thermal injury to the skin. However, the inherent low thermal conductivity of polymers limits the improvement of hydrogels’ cooling performance. The present study reports a simple method by combining thermal conductive fillers 1D hydroxylated multiwall carbon nanotubes (CNT-OH) and 2D hydroxylated hexagonal boron nitride (BN-OH) to construct 3D conductive networks in hydrogels for cooling treatment and burn therapy. It is interesting that the thermal conductive fillers are aligned via varying the mass ratios of CNT-OH to BN-OH. Hence, the utilization efficiency of the thermal conductive fillers is improved; and the thermal conductivity of the hydrogels is enhanced up to 1.31 W*m −1 *K −1 , which is 226 % to the pristine hydrogel of 0.58 W*m −1 *K −1 . Consequently, the optimized hydrogel exhibits rapid cooling abilities that the heated porcine skin only takes 168 s to decrease 30 °C with the treatment of the hydrogel. More importantly, the thermal conductivity enhanced hydrogel exhibits the capacities of rapid cooling, reducing heat injury and pain relieving, and promoting wound healing in vivo tests, which prove that the enhanced thermal conductive and moisturizing hydrogel can be a good alternative for burn therapy.
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高影响因子
ACS Applied Nano Materials
·
2026
·
IF 5.8
Xinpu Yang,Zhanwen Wang,Siqi Chen,Yuan He,Gang Wang,Xiping Yang,Mingxia Lu
A Ni(OH)2/reduced graphene oxide (rGO) nanocomposite with a well-defined hexagonal nanosheet morphology was synthesized via a one-step hydrothermal approach using graphene oxide (GO) and nickel sulfate hexahydrate (NiSO4·6H2O) as precursors. Crucially, a commercial-level high mass loading of 8 mg·cm–2 was successfully achieved on the electrode. Structural analysis confirmed that the incorporation of rGO effectively prevents the agglomeration of Ni(OH)2 nanosheets, while forming an interconnected three-dimensional (3D) conductive network. This unique structure enhances the overall electrical conductivity and facilitates rapid ion diffusion even under heavy mass loading conditions. Electrochemical characterization in a three-electrode system revealed that the composite synthesized with a GO concentration of 1 mg·mL–1 (NG-1) exhibited remarkable rate capability across current density ranging from 0.5 to 5 A·g–1. At a current density of 0.5 A·g–1, it delivered a superior specific capacity of 369.5 C·g–1. When assembled into an asymmetric supercapacitor with activated carbon (AC), the hybrid device delivered a specific capacitance of 101.6 F·g–1 (174.4 C·g–1) at 0.5 A·g–1. More remarkably, it demonstrated exceptional cycling stability with 102.2% initial capacitance retention after 10,000 charge–discharge cycles at 2 A·g–1, confirming the excellent electrochemical stability of the NG-1 electrode. Notably, the assembled device attained an energy density of 36.12 Wh·kg–1 at a power density of 400 W·kg–1, significantly surpassing conventional electrochemical double-layer capacitors. The Ni(OH)2/rGO nanocomposites developed in this work combine facile synthesis with outstanding electrochemical properties, providing a promising material solution for high-power energy storage applications.
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高影响因子
Journal of Materials Chemistry A
·
2021
·Vol. 9
·期 22
·13279-13287
·
IF 12.732
Lin-Fei Gu,Cheng-Fei Li,Jia-Wei Zhao,Ling-Jie Xie,Jin-Qi Wu,Qian Ren,Gao-Ren Li
Two-dimensional transition metal hydroxides are greatly limited in the application of the electrocatalytic oxygen evolution reaction (OER) due to its large and inert basal planes. Herein, we report a one-step in situ etching hydrothermal method to construct Co(OH)2 and Ni(OH)2 heterostructure nanomaterials, successfully activating the basal plane of Co(OH)2. The abundant lattice strains that appear at heterogeneous interfaces cause a downshift of the d-band center of Co in Co(OH)2 and promote the desorption of oxygen during the OER process, which accelerates reaction kinetics of the OER and improves catalytic activity effectively. Furthermore, the electron interaction at the Co(OH)2/Ni(OH)2 interfaces leads to charge polarization, which will regulate the adsorption and dissociation of H2O molecules and enhances mass and electron transfer. Owing to the above advantages of Co(OH)2/Ni(OH)2 interfaces, the as-prepared composite catalysts show an excellent OER catalytic performance with a low overpotential of only about 270 mV at 20 mA cm−2, maintaining long-term catalytic stability for more than 24 h at 20 mA cm−2.
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GREEN CHEMISTRY
·
2020
·Vol. 23
·期 2
·973-982
·
IF 9.48
Weiwei Wang,Yaqin Zhang,Zifeng Yang,Zhencai Zhang,Wenjuan Fang,Donghui Niu,Hongyan He,Fei Xu
In this study, a series of high-activity imidazole-based dicationic ionic liquids (DILs) were designed and prepared as efficient catalysts for balancing the reactivity between the endo-hydroxyl group (endo-OH) and the exo-hydroxyl group (exo-OH) of isosorbide (ISO) to synthesize high molecular weight poly(isosorbide carbonate) (PIC). Meanwhile, the thermal performance of PIC was precisely optimized by regulating the chain configuration. The results showed that when the trace amounts (4.5 × 10−5 based on the ISO molar amount) of bis-(3-methyl-1-imidazole)-ethylene dibromide ([C2(Min)2][Br]2) were used, the weight average molecular weight (Mw) of PIC reached 98 700 g mol−1. It could be concluded from the results of the experiment and the stimulation that the high catalytic activity of DILs was attributed to the strong electrostatic interaction between the cation and the substrate and the effective balance of the reactivity of the endo-OH and the exo-OH. Furthermore, we found that the reduction of hydroxyl groups in the terminal groups and the increase of endo–endo (a1) structure in the repeating unit improved the thermal properties of PIC. Finally, 1H NMR, Fourier infrared spectroscopy, and density functional theory (DFT) calculations were used to verify the reaction process through anion and cation multi-site synergistic effect and a possible electrophilic–nucleophilic reaction mechanism was successfully obtained.
研究领域:
高分子化学
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材料科学
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催化
·
化学工程
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DOI
高影响因子
INORGANICA CHIMICA ACTA
·
2022
·
IF 3.118
Wei Wang,Jing-Zhe Li,Shi-Jian Luo,Zi-Xuan Yao,Kuan-Guan Liu
Using the atomic precisely structurally characterized clusters as electrocatalysts can provide some possible structure information about the active intermediate during the electrocatalytic N 2 reduction reaction (NRR) process. A Cu4 cluster, named [(bpy) 4 Cu 4 (C 10 H 8 SO 3 ) 4 (OH) 4 ]•4H 2 O ( 1 ), has been synthesized and fully characterized by IR, SXRD, XPS, EPR, et al. Single crystal structural analysis reveals that the core structure of the cluster has a step-scheme conformation with two μ 2 -OH and two μ 3 -OH groups. Electro-catalysis studies of this cluster show that it can achieve a highest NH 3 yield of 2.18 μg h −1 mg −1 and a FE of 0.97 % at −0.6 V. The excellent NRR performance may be attributable to the additional μ 3 -OH groups, based on the contrastively study of the other electrocatalysts of the Cu powder and the Cu 2 complex, named [(μ 2 -OH)(μ 2 -Cl)(bpy) 2 Cu 2 Cl 2 ] ( 2 ), with one μ 2 -OH group in its structure. This work provides some structure information about the possible active sites during the NRR process and inspires us to develop new cluster as efficient electrocatalysts for advancing sustainable NH 3 production. Using the atomic precisely structurally characterized clusters as electrocatalysts can provide some possible structure information about the active intermediate during the electrocatalytic N 2 reduction reaction (NRR) process. A Cu4 cluster, named [(bpy) 4 Cu 4 (C 10 H 8 SO 3 ) 4 (OH) 4 ]•4H 2 O ( 1 ), has been synthesized and fully characterized by IR, SXRD, XPS, EPR, et al. Single crystal structural analysis reveals that the core structure of the cluster has a step-scheme conformation with two μ 2 -OH and two μ 3 -OH groups. Electro-catalysis studies of this cluster show that it can achieve a highest NH 3 yield of 2.18 μg h −1 mg −1 and a FE of 0.97 % at −0.6 V. The excellent NRR performance may be attributable to the additional μ 3 -OH groups, based on the contrastively study of the other electrocatalysts of the Cu powder and the Cu 2 complex, named [(μ 2 -OH)(μ 2 -Cl)(bpy) 2 Cu 2 Cl 2 ] ( 2 ), with one μ 2 -OH group in its structure. This work provides some structure information about the possible active sites during the NRR process and inspires us to develop new cluster as efficient electrocatalysts for advancing sustainable NH 3 production.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Yiping Qiu,Xingyue Wu,Junyao Li,Zheng-Zhi Yin,Yong Qin,Yong Kong
In situ growth of Cu 2+1 O/Cu 2 (CO 3 )(OH) 2 /Co(OH) 2 on carbon cloth (CC) is achieved via a facile wet chemical oxidation strategy combined with hydrothermal method , and the self-supported Cu 2+1 O/Cu 2 (CO 3 )(OH) 2 /Co(OH) 2 displays a unique multi-dimensional hybrid structure. Cu 2+1 O (CuO with excess metal defects) electroless plated on the surface of CC can not only retain the nanostructures of Cu 2 (CO 3 )(OH) 2 and Co(OH) 2 , but also act as the buffer layer to ease volumetric expansion of the materials during the repeated charge/discharge process. When the CC@Cu 2+1 O/Cu 2 (CO 3 )(OH) 2 /Co(OH) 2 is used in flexible supercapacitors , it exhibits significantly enhanced areal specific capacitance (624.5 mF cm 2 at 0.5 mA cm 2 ), rate capability (86.6 %), cyclic stability (100.3 % retention after 1500 cycles) and coulombic efficiency (99.3 % retention after 1500 cycles) due to the synergistic effect of Cu 2+1 O buffer layer, two-dimensional (2D) Co(OH) 2 nanosheets and three-dimensional (3D) Cu 2 (CO 3 )(OH) 2 nanoblocks.
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高影响因子
Minerals
·
2023
·Vol. 13
·期 3
·318
·
IF 2.5
Yingli Chen,Xiyun Yang,Linglong Wu,Lirong Tong,Jing Zhu
This paper describes a leaching-purifying-precipitation process to recover magnesium from serpentine acid-leaching solution and to synthesize high purity Mg(OH)2and 4MgCO3·Mg(OH)2·4H2O. Fe, Al, and Cr in the leaching solution were removed using the oxidation precipitation method with active MgO as a precipitant and H2O2as an oxidant. Ni, Co and Mn were removed by Na2S precipitation to obtain a pure MgSO4solution. Mg2+ions were first precipitated with NH3·H2O to synthesize Mg(OH)2, followed by NH4HCO3precipitation to obtain 4MgCO3·Mg(OH)2·4H2O. A small part of MgSO4coprecipitates with Mg(OH)2to form MgSO4·5Mg(OH)2·3H2O. The Mg(OH)2was aged with a diluted NaOH solution to remove the sulfur; the two-stage precipitation percentage of Mg is 96.3%. Mg(OH)2has a purity of 98.48% with a sulfur content of 0.28%. This process provides a promising method for the high-efficiency recovery of Mg and the large-scale production of the high purity of Mg(OH)2from the serpentine.Keywords:serpentine;two-stage counter current leaching;remove impurity;MgSO4·5Mg(OH)2·3H2O;high purity Mg(OH)2
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Journal of Materials Chemistry B
·
2018
·Vol. 6
·期 47
·7862-7870
·
IF 4.776
Jian Chen,Dongya Zhang,Yan Zou,Zhongjie Wang,Mingcong Hao,Meng Zheng,Xue Xue,Xiaoxi Pan,Yiqing Lu,Jiefei Wang,Bingyang Shi
Nanohybrids fabricated with upconversion nanoparticles (UCNPs) and gold nanoparticles (NPs) hold great promise for near-infrared photothermal therapy (NIR-PTT) and upconversion fluorescence imaging. However, the obstacles of poor solubility in water and finite hydrophilic modification method for UCNPs limit their application in biological fields. Herein, we report a novel UCNP@Al(OH)3/Au nanohybrid mediated by a highly hydrophilic and biocompatible Al(OH)3 layer to realize a synergistic targeted PTT and fluorescence imaging capability to U87MG tumor-bearing mice under NIR light irradiation. The modification with Al(OH)3 layers can improve the water solubility of UCNPs. And cytotoxicity assays and hemolysis assay showed that the modification with Al(OH)3 layers makes UCNPs have low cytotoxicity and good biocompatibility. In addition, the Al(OH)3 layers are thin enough to allow fluorescence resonance energy transfer (FRET) between UCNPs and gold NPs to occur, giving the NPs a good PTT effect for tumor-bearing mice. Meanwhile, as the pH-sensitive Al(OH)3 layers decompose in acidic tumor microenvironments with Au NPs detached from their surface, the FRET effect no longer occurred, subsequently leading to the fluorescence intensity of naked UCNPs being recovered for good imaging effects. The study suggests that Al(OH)3 mediation layer as a promising hydrophilic nanoplatform can potentially be used for the preparation of superior hydrophilic NPs and pH-stimulated drug release carriers for theranostic application in vivo.
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PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2013
·
IF 2.39
Hongtao Cui,Yunan Zhao,Wanzhong Ren,Minmin Wang,Yan Liu
In this work, α-Co(OH) 2 and β-Co(OH) 2 nanosheets were selectively synthesized through an epoxide precipitation reaction under mediation of fluoride ions. The protonation and ring opening reaction of propylene oxide promoted the hydrolysis [Co(H 2 O) 6 ] 2+ to form a mixed phase of α-Co(OH) 2 and Co 2 (OH) 3 Cl in the condition of no existence of fluoride ions. Due to the enhanced hydrolysis of [Co(H 2 O) 6 ] 2+ under function of fluoride ions, pure phases of α-Co(OH) 2 and β-Co(OH) 2 were formed respectively at different concentration of fluoride ions. The mild reaction condition of this route allows for large scale synthesis of cobalt hydroxide nanosheets, which is only limited by volume of the vessel used as reactor.
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高影响因子
Nanoscale
·
2018
·Vol. 11
·期 3
·1058-1064
·
IF 7.233
Yu Ding,Ying Li,Yuanyuan Xue,Boqiang Miao,Shuni Li,Yucheng Jiang,Xien Liu,Yu Chen
Atomically thick ultrathin nanomeshes (NMs) possessing the inherent advantages of both two-dimensional nanomaterials and porous nanomaterials are attracting increasing interest in catalysis and electrocatalysis. Herein, we report a direct chemical synthesis of atomically thick Ni(OH)2-NMs by a NaBH4 assisted cyanogel hydrolysis method, which overcomes the shortcoming of the post-etching method for NM synthesis. Various physical characterization methods show that the as-synthesized Ni(OH)2-NMs have 1.7 nm thickness, a big surface area, abundant nanoholes, and numerous surface/edge atoms with low-coordination numbers. The as-synthesized Ni(OH)2-NMs show a better electrocatalytic performance for the urea oxidation reaction than conventional Ni(OH)2 nanoparticles without holes in the alkaline electrolyte, including a lower onset oxidation potential, faster reaction kinetics, and higher mass activity.
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高影响因子
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