JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
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IF 6.371
Jianyang Li,Jingqi Tian,Mengting Lu,Chenyu Yang,Huaiguo Xue,Tengfei Jiang
Delafossite structure CuFeO 2 has attracted researchers’ interest because of its narrow band gap, high stability, low cost and easy availability. However, due to the low efficiency of internal photoinduced charge separation, there is still a gap between its performance and practical application. Herein, a 2D on 2D CuFeO 2 /Co-LDH heterojunction was prepared by in situ growth method with enhanced charge separation efficiency resulted from the interfacial built-in electric field. Electrochemical and spectroscopic characterization were carried out which illustrated the energy band structure of heterojunction indicating the photoinduced electrons transfer from Co-LDH to CuFeO 2 . By fine-tuning the amount of precursor, we found that CuFeO 2 /Co-LDH-3 heterojunction showed the highest photocurrent of 6.07 μA/cm −2 , which presented optimal performance of photocatalytic selective oxidation of benzyl alcohol with the average conversion and selectivity of 84.33%, and 98.48%, respectively. This work proposes a preparation method of novel 2D on 2D CuFeO 2 /Co-LDH heterojunction, which promotes the development of the heterojunction photocatalysts .’
研究领域:
材料科学
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化学
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产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2024
·
IF 8.1
Jing Wang,Min Wang,Zhenjiang Lu,Jing Xie,Jianguo Huang,Jindou Hu,Yali Cao
The inefficient Ni/Fe ion utilization and poor electrical conductivity of nickel-iron layered double hydroxide (NiFe-LDH) restricts to its development in electrocatalytic oxygen evolution reaction/urea oxidation reaction (OER/UOR). Herein, self-supported Hf-doped NiFe-LDH nanosheet arrays were successfully prepared on nickel foam (Hf-NiFe-LDH/NF) via a one-step solvothermal approach for the first time, in which the introduced high-valent Hf 4+ altered the structure of electrons and chemical environment of the atoms and promoted the production of more active sites, thus realizing the fast kinetics of electron transfer on the layer. Meanwhile, the doped metal Hf ions increased the electric conduction and recycling stability of the catalyst. Astoundingly, the overpotential of Hf-NiFe-LDH/NF is barely 258 mV at a current density of 100 mA cm −2 , which is 61 mV lower than that of NiFe-LDH/NF, as well as outstanding stability for over 90 h during the OER. Similarly, the potential is only 1.37 V at 100 mA cm −2 during the UOR, 118 mV less was than at OER. Notably, Hf-NiFe-LDH/NF electrocatalyst exceeds the most previously reported electrocatalysts in terms of performance. This study highlights the benefits of Hf doping strategy in electrocatalytic OER/UOR and presents a promising new type of catalyst for future research.
研究领域:
材料科学
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电化学
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产品关联
DOI
高影响因子
Journal of Energy Storage
·
2024
·
IF 8.9
Shuai Wu,Debin Cai,Zhen Tian,Li Guo,Yanzhong Wang
Metal-organic frameworks (MOFs) have garnered significant attention as supercapacitor electrode materials on account of their large specific surface area, regulatable structure and composition. However, the serious aggregation and low active sites result in the low specific capacitance and impede their application for high-performance supercapacitor. Herein, two-dimensional NiCo-MOF@LDH hybrid nanosheets were synthesized by a one-step solvothermal process utilizing 1, 4-terephthalic acid and urea. The hydrolysis of urea releases OH − that not only serves as the deprotonation of terephthalic acid but also react with Ni and Co ions to produce NiCo-LDH nanosheets . The produced NiCo-MOF@LDH-2 nanosheets displays high specific capacitance of 1873.9 F g −1 at 0.5 A g −1 as well as excellent rate performance. Furthermore, the constructed asymmetric supercapacitor device has a high energy density of 49.8 Wh kg −1 when the power density is 422.4 W kg −1 . Meanwhile, the capacitance retention can maintain 83 % after 10,000 cycles even at a current density of 5 A g −1 . The excellent electrochemical properties of NiCo-MOF@LDH are assigned to the high specific surface area and abundant active sites generated by the cross-linked nanosheet structure.
研究领域:
材料科学
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能源存储与转换
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Yan Zhang,Xuexian Wu,Guodong Fu,Xian-Zhu Fu,Jing-Li Luo
NiCo x P @ NiCo-LDH catalysts are prepared by phosphating NiCo nanosheets on NiCo-layered double hydroxide (LDH) with multi-layer heterostructure . The NiCo x P @ NiCo-LDH could undergo electrocatalytic hydrogen evolution from the methanol/water mixture and value-added formate co-production. During the electrocatalytic reactions, the phosphating NiCo x P nanosheets could greatly improve the electron transfer efficiency, and it has a synergistic effect with heterostructures to enhance the electrocatalytic performance. During the hydrogen evolution and methanol oxidation reactions, the potential is only 0.132 and 1.23 V when the current density reaches 10 mA cm −2 . Meanwhile, the NiCo x P @ NiCo-LDH symmetric two-electrode electrolyzer has a lower potential of only 1.43 V at a current density of 10 mA cm −2 and the Faraday efficiency of the production of formate and H 2 is nearly 100%. The electrocatalysts also display excellent stability during the water/methanol co-electrolysis.
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2022
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IF 5.518
Shuaishuai Zhang,Lingling Zhang,Li Liu,Xiao Wang,Jing Pan,Xiqiang Pan,Han Yu,Shuyan Song
Formaldehyde (HCHO) is a harmful gas of volatile organic compounds (VOCs) and its removal is essential to protect human health. Low-temperature elimination of HCHO by non-noble catalysts is one of the most crucial research topics nowadays. Herein, ultrathin MnO 2 nanosheets grown on Ni-Co layered double hydroxide nanocages (NiCo-LDH@MnO 2 ) were fabricated via a hydrothermal method and subsequently used to eliminate HCHO at low temperature. The NiCo-LDH@MnO 2 -1 catalysts (mass ratio of NiCo-LDH to KMnO 4 of 1:1) performed excellent catalytic activity towards HCHO (100 ppm) at 80 °C. After the fifth cycles, the NiCo-LDH@MnO 2 -1 exhibited excellent stable activity towards the oxidation of HCHO. According to the physicochemical characterization analysis, the enhanced catalytic activity over NiCo-LDH@MnO 2 is attributed to the unique hollow nanocage structure, suitable composition , as well as the synergistic influence of MnO 2 and NiCo-LDH. The results of in situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) presented that the abundant active species (e.g., O 2 − , O − and –OH) can contribute to the adsorption of HCHO on the surface of NiCo-LDH@MnO 2 and promote to oxidize HCHO into the DOM, formate, and carbonate species. Furthermore, NiCo-LDH@MnO 2 displayed good durability for low concentration HCHO (∼9 ppm) at room temperature under 12 h, indicating that the NiCo-LDH@MnO 2 is competitive and inexpensive efficient catalysts for the applications of indoor HCHO purification.
研究领域:
环境科学
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材料科学
✓ 已验证
DOI
高影响因子
Chemistry-An Asian Journal
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2025
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IF 3.3
Pengkun Wei,Wenhui Zhang,Liuting Wang,Huayu Yao,Ruijuan Duan,Jianbiao Peng
Coupling of anodic oxygen evolution reaction (OER) and cathodic molecular oxygen activation (MOA) addresses the issues of conventional electrochemical advanced oxidation process (EAOP), such as parasitic anodic oxygen evolution and potential formation of halogenated byproducts in the presence of halogens, while the key to this process is an anodic O 2 supply generated from the hysteretic OER. Herein, we have constructed crystalline-amorphous cobalt–nickel-layered double hydroxide (CoNi-LDH) nanosheets by simple one-step ultrasound treatment as OER catalysts. Benefiting from the partially amorphous and porous structure, the CoNi-LDH heterojunction shows an overpotential of 260 mV to achieve a current density of 10 mA cm −2 . Besides, it also exhibits excellent electrochemical stability in basic media, which is significantly superior to the corresponding layered monometallic hydroxides. This work provides inspiration for optimizing the catalytic activity of OER electrocatalysts through combining crystalline and amorphous heterojunction, expecting the potential application in OER/MOA process.
研究领域:
电化学
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材料科学
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催化
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纳米技术
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环境工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2024
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IF 6.3
Huarui Han,Songbai Zhang,Shushan Song,Weijie Zhang,Dandan Liu,Ziheng Song,Qianyu Wang,Changchang Ma,Sheng Feng,Xuemei Duan
In this study, a new type of 2D/2D Bi 2 O 3−x /NiAl-LDH (BO/NA-LDH) S-scheme photocatalyst was prepared by combining NiAl-LDH with Bi 2 O 3−x by wet chemical deposition for obtaining efficient photothermal-assisted photocatalytic reduction of CO 2 under simulated sunlight irradiation. In particular, the as-prepared optimal 50-BO/NA-LDH sample exhibited the CO production yield of 83.55 ± 2.76 μmol/g/h, which was 9 and 27 times that of BO (9.32 ± 0.62 μmol/g/h) and NA-LDH (3.09 ± 0.38 μmol/g/h), respectively. The enhancement of photothermal-assisted activity over the 50-BO/NA-LDH system was mainly attributed to the coupling of the photothermal conversion performance of Bi 2 O 3−x and improving the migration efficiency of interface carriers of S-scheme heterojunction and 2D/2D structure. This study presents a promising strategy for the development of high-efficient photothermal-assisted photocatalysts.
研究领域:
材料科学
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环境科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2024
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IF 8.1
Zhao-Xing Yan,Ling-Xi Zhao,Ning Liu,Na Li,Ru-Song Zhao
Non-steroidal anti-inflammatory drugs (NSAIDs) have gained significant attention as emerging pollutants and are increasingly detected in aquatic environments. Therefore, it is imperative to investigate the efficient removal of NSAIDs from water systems. In this study, a magnetic LDH with three-dimensional hollow structure (Fe 3 O 4 @ZIF-67@Co-Ni LDH) was synthesized using ZIF-67 as a template for the removal of carprofen (CPF) and flurbiprofen (FLU) from water environments. The adsorption process of CPF and FLU on Fe 3 O 4 @ZIF-67@Co-Ni LDH and the competitive adsorption between these two NSAIDs were investigated. The adsorption mechanism was explored by experimental analysis and theoretical calculation. Results demonstrated that the pseudo-second-order kinetic model and Liu isotherm model can better fit the kinetic and isotherm data, and according to the thermodynamic data analysis, the adsorption process was exothermic, spontaneous and stable. The adsorption capacity of CPF and FLU on Fe 3 O 4 @ZIF-67@Co-Ni LDH can reach 856.2 mg/g and 797.5 mg/g. Fe 3 O 4 @ZIF-67@Co-Ni LDH exhibited high adsorption capacity for CPF and FLU in actual environment water, with stronger affinity towards CPF when both NSAIDs coexisted simultaneously. The three-dimensional hollow structure enhanced the adsorption capacity of Fe 3 O 4 @ZIF-67@Co-Ni LDH, making it a promising adsorbent for NSAIDs.
研究领域:
环境科学
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水处理
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材料科学
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产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
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2021
·Vol. 56
·期 35
·19466-19475
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IF 4.22
Ding Jinjin,Zhang Mengke,Wei Xiaoqing,Song Wenwu,Wang Jin,Sun Tongming,Zhu Jinli,Wang Minmin
A rational structural strategy to design rambutan-like NiFe-LDH nanocluster arrays electrode via a buffer-salt-assisted hydrothermal method was reported. For our developed electrode, large stable current density of 100 and 200 mA cm −2 at overpotential of only 283 and 300 mV in oxygen evolution reaction in alkaline electrolyte was obtained, which is dramatically lower than many previous reported overpotentials. It also exhibits low Tafel slope at current range from 10 to 25 mA cm −2 (56.47 mV dec −1 ). Further analysis demonstrates the key role of higher carriers of the rambutan-like NiFe-LDH nanocluster arrays electrode in boosting the water-splitting performance of the resulting system. Benefiting from the fine geometry shape of the self-supported nanocluster nanoarrays electrode, the transfer process of the reactants and oxygen/hydrogen bubbles is accelerated. In addition, a 19-time enhancement of carrier concentration for our developed rambutan-like NiFe-LDH nanoclusters (2.9 × 10 29 m −3 ) is obtained. Notably, the resultant rambutan-like NiFe-LDH nanocluster arrays electrode exhibits enhanced stability (in high and low current density) for the full water splitting in 1 M KOH, remaining nearly 100% of the original current density after continued testing for 20 h. This finding may provide new insight on rational structural design LDH nanostructures with high performance for electrocatalysis. Graphic abstract A highly hydrophilic NiFe-LDH nanocluster arrays electrode is developed for efficient full water splitting. Large and stable current density of 200 mA cm −2 is obtained at overpotential of 300 mV. Besides, the faraday efficiency is nearly 100%.
研究领域:
材料科学
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电催化
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2025
·
IF 6.9
Ruiqi Zhang,Yanyan Zhang,Kang Wang,Xitao Wang,Baoquan Zhang
In this work, the heterostructure between Cu particles and ZnFe-LDH semiconductor with lantern shape was constructed by reducing the ternary CuZnFe-LDH using H 2 , and the effects of Cu loading and the formation of heterojunction on photocatalytic CO 2 reduction to CO and CH 4 were investigated. The results showed that the hollow and layer-stacking structure of the catalyst was beneficial to the light utilization, adsorbing and activating of carbon dioxide. The Cu cations could enter into the lattice of ZnFe-LDH to form a ternary CuZnFe-LDH, which could be reduced to Cu particles with smaller size by H 2 and resulting in the heterostructure between Cu and ZnFe-LDH. The loading of Cu particles can significantly enhance the light absorption, photogenerated carriers transfer rate and separation efficiency of ZnFe-LDH, thus improving photocatalytic activity. As expected, Cu 1.6 ZnFe-R catalyst exhibited the highest catalytic activity with CO yield of 45.35 μmol·g cat −1 ·h −1 and CH 4 yield of 39.33 μmol·g cat −1 ·h −1 , which were 2.81 and 6.19 times higher than those of ZnFe-LDH, respectively. Meanwhile, Cu particles acted as electron-rich centers and CO 2 adsorption sites can noticeably improve the CH 4 selectivity and inhibit H 2 production. The Cu 1.6 ZnFe-R catalyst exhibits the highest CH 4 electron-based selectivity of 65.17 %, the highest electrons consumed of 482.80 μmoL·g cat −1 ·h −1 for CO 2 reduction and the lowest H 2 electron-based selectivity of 16.04 %.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
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2025
·
IF 4.1
Ju Zhang,Junli Wang,Xuanbing Wang,Naixuan Zong,Jinlong Wei,Jing Wang,Can Zhang,Yuantao Yang,Shengyou Su,Tianyang Liu,Ruidong Xu,Linjing Yang
Transition metal sulfides are widely recognized for their low cost, low toxicity, high safety, and potential as a positive electrode material for supercapacitors. However, due to its own volume effect, it usually has poor capacitance retention as positive electrode materials. Herein, the NiS/NiCo-LDH (Layered double hydroxide, LDH) electrodes with considerable practical application potential is designed and prepared. The composite electrodes are prepared by a simple two-step electrodeposition process. The NiS/NiCo-LDH electrode, with its rational design, exhibits more superior electrochemical performance compared to a single NiS electrode. The NiS/NiCo-LDH electrode shows a mass specific capacitance of 2620 F/g at a current density of 1 A/g, which is 1.88 times that of the single NiS electrode. Furthermore, the assembled NiS/NiCo-LDH//AC hybrid supercapacitor (HSC) device achieves an energy density of 93.3 Wh kg −1 at a power density of 800 W kg −1 . Therefore, this work provides a new strategy for preparing supercapacitor electrode materials with excellent electrochemical performance.
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2017
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IF 3.387
Yanping Zhu,Runliang Zhu,Gangqiang Zhu,Miaomiao Wang,Yannan Chen,Jianxi Zhu,Yunfei Xi,Hongping He
Nowadays, two-dimensional (2D) nanosheets, such as layered double hydroxides (LDH), have received considerable attention for their potential to meeting clean energy demand and solving environmental problems. In this work, novel and efficient photocatalysts of plasmonic Ag nanoparticles coated Zn/Ti-LDH nanosheets have been synthesized through low-temperature reduction method. The structural characteristics of the as-prepared products were investigated by a series of characteristic methods The scanning electron microscopy (SEM) and transmission electron microscope (TEM) images showed that Ag nanoparticles were distributed on the surface of Zn/Ti-LDH uniformly. The UV–vis diffuse reflectance spectra (DRS) showed that the absorbance of Ag/LDH in visible-light region enhanced markedly and presented a broad band at 500–600 nm, which was resulted from the surface plasmon resonance (SPR) effect of Ag nanoparticles. The photocatalytic activities of Ag/LDH were evaluated by degradation of Rhodamine-B (RhB) and NO. The photocatalytic experiments showed that Ag/LDH had higher photocatalytic activity than that of pure LDH , and 2%Ag/LDH exhibited the highest photocatalytic activity. In addition, the 2%Ag/LDH exhibited high photochemical stability after multiple reaction runs. The obtained results from photoluminescence (PL) spectroscopic measurement and transient photocurrent ( I – V ) analysis both revealed the existence of Schottky barriers between LDH and Ag nanoparticles. The electron spin resonance (ESR) showed that OH were the dominant active species in the photo-degradation process. The enhanced photocatalytic performance of the composite should be ascribed to both the SPR effect of Ag nanoparticles in visible light and the Schottky barriers between LDH and Ag nanoparticles.
研究领域:
材料科学
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环境科学
✓ 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）