CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Jianping Ai,Yaping Shuai,Min Hu,Lihong Cheng,Siling Luo,Wenkui Li,Zhiqin Chen,Liling Hu,Zehua Zhou
A novel class of high-entropy (HE) spinel ferrites (Mg 0.2 Co 0.2 Ni 0.2 Cu 0.2 Zn 0.2 )Fe 2 O 4 , have been successfully synthesized by the solution combustion synthesis method followed by heat-treatment at 500–1500 °C. The resultant spinel ferrites were systematically investigated by various methods including XRD , SEM, TEM, EDS, Raman spectra, etc. It was demonstrated that the entropy drives a reversible transformation between a single-phase state and multiphase. And the entropy predominates the thermodynamic landscape. The as-fabricated high-entropy (Mg 0.2 Co 0.2 Ni 0.2 Cu 0.2 Zn 0.2 )Fe 2 O 4 solid solution is single-phase with homogeneous transition-metal element distribution. Moreover, a trade-off between grain growth and crystallization during heat-treatment process; the average grain size of product is only 352.96 nm after being annealed at 1000 °C for 3 h probably due to “sluggish diffusion effect”. The resultant HE spinel ferrites (Mg 0.2 Co 0.2 Ni 0.2 Cu 0.2 Zn 0.2 )Fe 2 O 4 were first used as a heterogeneous catalyst of peroxodisulfate (PDS). Compared with basic solution condition, the HE spinel ferrite/PDS system exhibited a higher degradation rate for the removal of rhodamine B (RhB) and tetracycline (TC) at initial pH range of 3.0–5.1. Both the hydroxyl radicals and sulfate radicals played an important role on RhB and TC degradation. The high catalytic efficiency and good stability of high-entropy (Mg 0.2 Co 0.2 Ni 0.2 Cu 0.2 Zn 0.2 )Fe 2 O 4 catalyst demonstrates that it is suitable for application in wastewater disposal.
✓ 已验证
产品关联
DOI
高影响因子
ChemNanoMat
·
2023
·Vol. 9
·期 7
·e202300087
·
IF 3.8
Tingyi Wu,Huanglin Dou,Zhenxin Zhao,Junliang Zhou,Xiaomin Wang
Graphical The NiMoO 4 -modified separator can not only use its own strong polarity to chemisorption of polysulfides and effectively suppress the shuttle effect, but also can promote the mutual transformation between polysulfides of different phases, reduces the reaction potential barrier, and the redox kinetics is significantly improved. Besides, the hollow microsphere structure facilitates the penetration of electrolyte and establishes a pathway for ion/electron transport, which accelerates the Li + diffusion rate. Lithium-sulfur (Li−S) batteries are considered to be the most promising candidates for achieving low-cost, high-energy density systems. The serious shuttle effect of polysulfides (LiPS) and the sluggish redox kinetics have become major obstacles to the practical application of Li−S batteries. Herein, a hollow microsphere structure of transition bimetallic oxide nickel molybdate (NiMoO 4 ) was prepared by hydrothermal reaction and calcination method. It was used as a separator coating material to inhibit LiPS shuttle and promote efficient redox conversion of sulfur species. The hollow microsphere structure not only possesses a large internal space to physically confine LiPS but also exposes abundant active sites to enhance the redox kinetics of LiPS. The NiMoO 4 shows superior adsorption ability for LiPS and accelerated ion/electron transport rates compared to NiO, thus facilitating the anchoring-conversion-diffusion processes of polysulfides. Benefiting from this versatility, the Li−S batteries with NiMoO 4 -PP exhibit a high discharge specific capacity of 1354.5 mAh g −1 at 0.1 C. In addition, the battery exhibits excellent cycling stability with a capacity decay rate of 0.027% for 500 cycles at 2 C. These results demonstrate the potential application of NiMoO 4 -based electrocatalysts in high-performance Li−S batteries.
✓ 已验证
DOI
高影响因子
Analytical Methods
·
2023
·Vol. 15
·期 14
·1819-1825
·
IF 3.1
Jing Wan,Jian-Mei Zou,Shu-Jing Zhou,Feng-Lan Pan,Fei Hua,Yu-Lan Zhang,Jin-Fang Nie,Yun Zhang
A novel nanozyme of bimetallic (Ni/Co) metal–organic framework (Ni/Co-MOF) was synthesized using a simultaneous precipitation and acid etching method with a zeolitic imidazolate framework ZIF-67 as the template. The as-synthesized Ni/Co-MOF catalyst presented a three-dimensional hollow nanocage structure and exhibited excellent intrinsic oxidase-like activity. It was demonstrated that Ni/Co-MOF could directly catalyze the oxidation of 3,3′,5,5′-tetramethylbenzidine (TMB) to produce a blue product (oxidized TMB, oxTMB) in the absence of H2O2. The mechanisms and kinetics of this nanozyme activity were investigated, and it was determined that the catalytic activity of Ni/Co-MOF was closely related to temperature and solution pH. Owing to its strong reducibility, ascorbic acid (AA) could reduce oxTMB, and the blue color of the reaction mixture faded over time. Therefore, a novel colorimetric platform was constructed to detect AA based on the oxidase-like activity of Ni/Co-MOF. Under optimal conditions, the absorbance of ox-TMB at 652 nm decreased linearly over the 0.015–50 μM AA range with a detection limit of 0.004 μM.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Biomass Conversion and Biorefinery
·
2023
·
IF 4
Nie Fahui,Guan Kun,Zou Chenglong,Xu Zhiwei,Liu Zhanmeng
Ferrate, as an internal oxidation modifier, is rarely used in the preparation of magnetic biochar. This research promotes rice shell charcoal modified by K 2 FeO 4 preparation of oxygen-containing groups and ɤ-Fe 2 O 3 magnetic biochar. Magnetic rice husk biochar (MBC) is prepared to adsorb Ni(II) from aqueous solutions. The effects of various parameters on the adsorption of Ni(II) by MBC have been studied, and the results show that MBC has an excellent adsorption capacity for Ni(II). At 25 °C and pH 7.0, the removal rate of Ni(II) reaches 96.1% within 24 h at an adsorbent dose of 0.5 g/L when the initial Ni(II) concentration is 20 mg/L. The kinetic model conforms to the pseudo-second-order kinetic model and the intra-particle diffusion model within 36 h. Moreover, the adsorption data were successfully reproduced by the Langmuir isotherm, and the maximum adsorption capacity is 42.69 mg/g. The adsorption data conform to the D-R model, and the calculated average adsorption free energy is 41.03 kJ/mol, indicating that the adsorption process is mainly chemical adsorption. Thermodynamic study indicates that the endothermic adsorption process is spontaneous and can be promoted by the increase in temperature. This study was expected to provide a reference and theoretical basis for the treatment of Ni(II)-containing wastewater using modified rice husk biochar.
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Yuan-li Wang,Tong-hui Yang,Song Yue,Hang-bo Zheng,Xiao-pan Liu,Peng-zhao Gao,Hang Qin,Han-ning Xiao
Composition optimization, structural design, and introduction of external magnetic fields into the catalytic process can remarkably improve the oxygen evolution reaction (OER) performance of a catalyst. NiFe2O4@(Ni, Fe)S/P materials with a heterogeneous core–shell structure were prepared by the sulfide/phosphorus method based on spinel-structured NiFe2O4 nanomicrospheres. After the sulfide/phosphorus treatment, not only the intrinsic activity of the material and the active surface area were increased but also the charge transfer resistance was reduced due to the internal electric field. The overpotential of NiFe2O4@(Ni, Fe)P at 10 mA cm–2 (iR correction), Tafel slope, and charge transfer resistance were 261 mV, 42 mV dec–1, and 3.163 Ω, respectively. With an alternating magnetic field, the overpotential of NiFe2O4@(Ni, Fe)P at 10 mA cm–2 (without iR correction) declined by 45.5% from 323 mV (0 mT) to 176 mV (4.320 mT). Such enhancement of performance is primarily accounted for the enrichment of the reactive ion OH– on the electrode surface induced by the inductive electric potential derived from the Faraday induction effect of the AMF. This condition increased the electrode potential and thus the charge transfer rate on the one hand and weakened the diffusion of the active substance from the electrolyte to the electrode surface on the other hand. The OER process was dominantly controlled by the charge transfer process under low current conditions. A fast charge transfer rate boosted the OER performance of the catalyst. At high currents, diffusion exerted a significant effect on the OER process and low OH– diffusion rates would lead to a decrease in the OER performance of the catalyst.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Tingting Wei,Jie Bie,Wenqing Wei,Shuang Chen,Xiaobing Xu,Wei Fa,Xinglong Wu
The electrochemical oxygen evolution reaction is a bottleneck reaction in hydrolysis and electrolysis because the four-step electron transfer leads to slow reaction kinetics and large overpotentials. This situation can be improved by fast charge transfer by optimizing the interfacial electronic structure and enhancing polarization. Herein, a unique metal (Ni) organic (diphenylalanine, DPA) framework Ni(DPA) 2 (Ni-MOF) with tunable polarization is designed to bond with FeNi-LDH (layered double hydroxides) nanoflakes . The Ni-MOF@FeNi-LDH heterostructure delivers excellent oxygen evolution performance exemplified by an ultralow overpotential of 198 mV at 100 mA cm −2 compared to other (FeNi-LDH)-based catalysts. Experiments and theoretical calculations show that FeNi-LDH exists in an electron-rich state in Ni-MOF@FeNi-LDH due to polarization enhancement caused by interfacial bonding with Ni-MOF. This effectively changes the local electronic structure of the metal Fe/Ni active sites and optimizes adsorption of the oxygen-containing intermediates. Polarization and electron transfer of Ni-MOF are further enhanced by magnetoelectric coupling consequently giving rise to better electrocatalytic properties as a result of high-density electron transfer to active sites. These findings reveal a promising interface and polarization modulation strategy to improve electrocatalysis .
✓ 已验证
产品关联
DOI
PubMed
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2023
·Vol. 47
·期 16
·7566-7574
·
IF 3.3
Shengbiao Zheng,Tianna Liu,Nini Zhang,Liang Li,Yanli Zhu,Erhui Zhang,Jing Tang,Jiahao Guo
In this report, CoNi-bimetal metal–organic framework (CoNi-MOF) nanosheets with a three-dimensional (3D) flower-like hierarchical structure have been fabricated to modify a glassy carbon electrode and improve its efficiency for determination of quercetin. Scanning electron microscopy, X-ray photoelectron spectroscopy, N2 adsorption–desorption isotherms and impedance spectroscopy were used for the characterization of the CoNi-MOF. Under optimal electrochemical conditions, the anodic peak current measured around 0.44 V (vs. SCE) increased linearly in two linear ranges: 0.05 to 1.0 μM and 1.0–20 μM with a sensitivity of 13.21 μA μM−1 cm2 and 0.934 μA μM−1 cm2, respectively. The excellent electrochemical performance might be attributed to the hierarchical structure, large specific surface area and enhanced electrical conductivity. Finally, the analytical utility of the CoNi-MOF sensor was evaluated by detecting quercetin in human plasma samples.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2019
·
IF 4.175
Zhiguo Zhang,Hua Huo,Jinlong Gao,Zhenjiang Yu,Feitian Ran,Lei Guo,Shuaifeng Lou,Tiansheng Mu,Xucai Yin,Qun Wang,Geping Yin
In this paper, NiO nanoparticles uniformly embedded in spherical carbon matix in situ grown on reduced graphene oxide (rGO) has been successfully fabricated via a simple pyrolysis of nickel metal organic framework (MOF) precursor self-assembled on graphene oxide. This interaction between the carbon and the NiO can significantly maximize the surface of NiO for pseudocapacitance, provide effective electronical transmission path and improve the ionic absorbability and conductivity. As a result, the NiO/C/rGO hybrid electrode demonstrates high specific capacity (496 C g −1 at current density of 1 A g −1 ) and good cycling stability. Moreover, a hybrid supercapacitor assembled by NiO/C/rGO and a hierarchical porous carbon derived from sodium citrate can deliver a high energy density of 35.9 Wh kg −1 at a power density of 749.1 W kg −1 , and extraordinary cycling stability (120% retention after 3000 cycles). It has been demonstrated that the carbon matrix derived from the linker molecules in Ni-MOF, which maintains close contact with both the size-controlled NiO nanocrystals and the electronic conductive rGO, is vital to synergize the electric double layer capacitance from the carbon materials and the battety-type behavior from NiO for high-performance energy storage.
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2019
·
IF 5.155
Luhong Zhang,Ziqiang Gong,Bin Jiang,Yongli Sun,Zhenxing Chen,Xiang Gao,Na Yang
Recently, there is an urgent demand to remove oil and organic solvents with low surface tension from oily wastewater, which promotes the application of interface biomimetic materials in oil/water separation. In our work, a novel Ni Al LDHs coated superhydrophobic and superoleophilic stainless steel mesh (SS-SSM) with efficient oil/water separation performance was successfully prepared. The 3D flower-like structure intercalated by LDHs monocrystalline flakes was anchored on metallic wires in urea solution by a hydrothermal method and decorated with low surface energy molecules. The as-prepared mesh exhibited perfect superhydrophobicity with water contact angle of 156° and sliding angle of 5°, thus achieving self-cleaning property. In addition, the separation efficiency for a series of oil/water mixtures of the coated mesh was studied, which was up to 98% for most sample oils. More importantly, even treated under severer conditions such as ultrasonic , abrasion and chemical etching solution, the as-prepared meshes possessed good reproducibility in terms of contact angles and separation efficiencies. It is expected that the designed mesh could provide a b brand-new method for superhydrophobic surface coating , making it a potential functional material for self-cleaning, anti-corrosion, fluid drag reduction and oil/water separation.
✓ 已验证
产品关联
DOI
高影响因子
ENERGY CONVERSION AND MANAGEMENT
·
2019
·
IF 7.181
Jie Ren,Jing-Pei Cao,Fei-Long Yang,Xiao-Yan Zhao,Wen Tang,Xin Cui,Qiang Chen,Xian-Yong Wei
Lignite rich in oxygen-containing species (OCSs) was employed as perfect ion-exchange material for high activity catalyst preparation. HCl treatment Shengli lignite (HSL) selectively removed the organic salt and improved capability of ion exchange. In this paper, highly desirable and layered carbon supported Ni catalyst was prepared by modified lignite. Thanks to the excellent role of Ni (1 1 1) plane and porous layered graphene-like delocalized electronic structure, specific structure of lignite provides an exchange platform in facilitating the Ni electron transfer during the catalytic reaction process. Ni loaded on HSL (Ni/HSL) showed the great catalytic activity and stability for reforming of toluene and biomass tar. Ni/HSL prepared at 650 °C shows the great activity and stability for toluene steam reforming (TSR) and biomass tar reforming (BTR). A series of instruments (XRD, SEM, TEM, H 2 -TPR, XPS, CO pulse adsorption, etc.) were employed for characterization. Based on these significant characterizations of catalyst, calculation of turnover frequency (TOF), and results of conversion of toluene and corncob tar. The results revealed the layered delocalized electronic structure of Ni/HSL, which has lower activation energy than other reported catalysts. Uniform dispersed catalyst was synthesized successfully for reforming of toluene and biomass tar.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2019
·
IF 7.467
Qinglu Fan,Shaodian Yang,Jun Liu,Haodong Liu,Kaiji Lin,Rui Liu,Chaoyu Hong,Liying Liu,Yan Chen,Ke An,Ping Liu,Zhicong Shi,Yong Yang
In this work, a unique artificial interface combing characteristics of both high ionic and electronic conductivities has been successfully constructed at the surface of Ni-rich LiNi 0 · 8 Co 0 · 1 Mn 0 · 1 O 2 (NCM811). The ionic conductor layer is fabricated through reacting H 3 PO 4 with the lithium residuals on the surface of NCM811 to form Li 3 PO 4 . The interface with high electronic conductivity is constructed by attaching graphene fragments to the NCM811 spherical particles. Due to the synergistic effect of the Li 3 PO 4 coating layer and the graphene network, the modified sample (GN-LPO-NCM811) exhibits high capacity retention of 94.3% after 150 cycles at 0.5C between 3.0 and 4.3 V, while the pristine material shows a much lower retention of only 88.1%. In addition, the GN-LPO-NCM811 also presents improved cycling stability at elevated temperature of 55 °C. Even at an extremely high rate of 10C, the GN-LPO-NCM811 still remains 70% of its original capacity, while the pristine NCM811 only delivers 50% of the capacity. The stable cycling performance of GN-LPO-NCM811 is demonstrated in a full cell with graphite anode at ambient temperatures. Importantly, the thermal stability of the modified samples is also greatly enhanced. This study provides an effective method to improve the electrochemical performance of LiNi 0 · 8 Co 0 · 1 Mn 0 · 1 O 2 .
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2018
·
IF 11.698
Yang Jiao,Weizhao Hong,Peiying Li,Lixin Wang,Gang Chen
Herein, an effective and novel strategy has been designed to increase electrochemical reaction active sites in Ni/NiO nanoparticles prepared by optimizing the annealing temperature of nickel-based metal organic framework (Ni-MOF). Note that the incorporation of Ni 3+ into the primitive lattice of Ni/NiO nanoparticles will cause a subtle atomic rearrangement, providing a large number of electrochemical reaction active sites. The density functional theory (DFT) simulation results also exhibit that the introduction of Ni 3+ significantly lowers the gibbs free energy of atomic hydrogen absorption on the surface of Ni/NiO, benefiting H 2 gas evolution. On the basis of the above advantages, the as-synthesized Ni/NiO nanoparticles exhibit excellent performance for supercapacitors (SCs, the areal specific capacitance of 684.4 m F cm −2 at 1 mA cm −2 ) and Hydrogen evolution reaction (HER, ultralow overpotential of 41 mV at 10 mA cm −2 ). Significantly, the all-solid-state flexible asymmetric SCs based on Ni/NiO as anode and CNTs-COOH as cathode displays a high energy density of 61.3 W h kg −1 at the power density of 900 W kg −1 . This work highlights the crucial role of the lattice distortion of materials for future applications in the sustainable energy storage and conversion.
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）