APPLIED CLAY SCIENCE
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2021
·
IF 5.467
Atian Xie,Jiuyun Cui,Jin Yang,Chunxiang Li,Yi Wang,Jiangdong Dai
The effective treatment of oily wastewater is of great significance for the protection of the ecological environment and human health. Aiming to prepare a membrane with excellent antifouling properties, a new active antifouling carbon cloth@Ni-Co LDH/Ag (CC@LDH/Ag) membrane was reported here via in situ hydrothermal growth and followed photo-deposition methods. The effects of Ag deposition on self-cleaning ability and surface wettability of CC@LDH/Ag membrane were studied. The experimental results showed CC@LDH/Ag membrane is superhydrophilic/underwater superoleophobic, and exhibited high separation efficiency (>98.6%) and high flux (6551–22,050 L m −2 h −1 ) for different kinds of oil/water mixtures. Moreover, CC@LDH/Ag membrane also displayed excellent environmental and mechanical durability. Good self-cleaning ability enabled CC@LDH/Ag membrane to be separated at least 30 times, and still maintained high separation performance. The self-cleaning CC@LDH/Ag membrane may hold great application prospects in oily wastewater remediation.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
Nanoscale
·
2020
·Vol. 12
·期 46
·23799-23808
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IF 6.895
Xiaoxiao Wang,Jing Li,Yuanyuan Liu,Meiri Wang,Hongtao Cui
As a typical electrode material in Faraday supercapacitors (FSs), Ni(OH)2 has some intrinsic issues such as low electrical conductivity and structural instability, resulting in its low performance. In view of these issues, we design a multifunctional nanostructure, rigid nanosheet-interlaced structure of Ni–Co LDH/graphene to improve the electrical conductivity and structural stability of Ni(OH)2. Under the high shear applied by a high shear mixer (HSM) and the regulation of polyvinylpyrrolidone (PVP), the designed structure is realized. Benefitting from the well-designed structure and improved electrical conductivity of the graphene sheet-high homogenization, Ni–Co LDH/graphene presents the expected performance. It exhibits a high specific capacity of 1020 C g−1 at a low current density of 2.7 A g−1 and excellent high rate performance (637.5 C g−1 at 62.5 A g−1). The asymmetrical supercapacitors (ASCs) assembled with the composite as the positive material show high energy density (86.5 W h kg−1 at a power density of 695.7 W kg−1). Due to the improved structural stability, the ASCs also exhibit high cycling stability (a capacity retention of 97.8% after 10 000 charge–discharge cycles).
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
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2019
·
IF 8.355
Xiaohui Guan,Mohan Huang,Liu Yang,Guangsheng Wang,Xin Guan
In this paper, two-component nanocages containing CoS x and nickel-cobalt layered double hydroxides (Ni-Co LDH) were facilely synthesized via a multistep transformation approach. The zeolitic imidazolate framework-67 (ZIF-67) nanocrystals were firstly synthesized, and then after partial sulfuration, the CoS x /Ni-Co LDH nanocages were achieved by adding nickel ions for etching and precipitation. The prepared CoS x /Ni-Co LDH nanocages consisted of the hollow rhombic dodecahedral morphology with many nanosheets arrays on the shell. When used as electrode materials for electrochemical capacitors, this CoS x /Ni-Co LDH nanocages deliver a specific capacitance of 1562 F g −1 at a current density of 1 A g −1 . In addition, an asymmetric supercapacitor assembled with CoS x /Ni-Co LDH as cathode and active carbon (AC) as anode shows a high energy density of 35.8 Wh kg −1 at a power density of 800 W kg −1 and has an excellent cycling performance with the retention rate of 94.56% after 10,000 cycles, suggesting their potential application in high-performance electrochemical capacitors. These exceptional electrochemical properties can be attributed to the unique structure and synergistic effects between the metal sulfide and the bimetallic hydroxide, which also indicate the potential application of CoS x /Ni-Co LDH nanocages in high-performance supercapacitors.
研究领域:
材料科学
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电化学
✓ 已验证
DOI
高影响因子
International Journal of Electrochemical Science
·
2023
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IF 1.5
Changshui Wang,Jiahui Zhang,Caiyan Shi,Dandan Cai
The development of an inexpensive, efficient and robust water oxidation catalyst is important to achieve water splitting for renewable energy production. Herein, nickel-cobalt layered double hydroxides (Ni-Co LDHs) were rationally synthesized by a facile method and can be served as efficient electrocatalysts for water oxidation. For comparison, Ni-Co LDH nanoflowers have also been synthesized by controlling the synthetic process. The composition and morphologies of the catalysts were characterized by X-ray diffraction (XRD), field-emission scanning electron microscopy (FESEM) and X-ray photoelectron spectroscopy (XPS). The as-obtained Ni-Co LDH nanocages exhibit a high catalytic activity toward the water oxidation reaction (WOR). The electrochemical results show that the overpotential of Ni-Co LDH nanocages electrode was 350 mV at a catalytic current density of 10.0 mA cm -2 in 1.0 M KOH. Moreover, the Tafel slope was as low as ~ 93 mV dec -1 . The unusual catalytic properties of Ni-Co LDH nanocages could be attributed to the hollow structure and the synergetic effect between Ni metal and Co metal.
研究领域:
材料科学
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能源化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2019
·Vol. 30
·期 14
·13360-13371
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IF 2.195
Li Yingli,Shan Lina,Sui Yanwei,Qi Jiqiu,Wei Fuxiang,He Yezeng,Meng Qingkun,Ren Yaojian,Liu Jinlong
Adopting of hydroxides alone as electrode materials exhibit moderate performance due to its poor cycle stability and conductivity. In this study, an ultrathin nanostructure composed of nickel–cobalt layered double hydroxide (Ni–Co LDH) grown on carbon fiber cloth (CFC) has been prepared via a simple and efficient electrodeposition (ED) method without any binder or conductive agent, demonstrating an excellent cycle performance of Ni–Co LDH. The electrode delivers an extraordinary specific capacitance of 1540 F g −1 at a current density of 1 A g −1 , with excellent rate capability of 1284.5 F g −1 even at 15 A g −1 as well as a great cycling stability of specific capacitance remaining 82.9% after 5000 cycles at 10 A g −1 . Then, an asymmetric supercapacitor (ASC) device, with Ni–Co LDH as the positive electrode and rGO as the negative one, shows a perfect electrochemical performance. It is believed that in the future, this kind of electrode material will have a widespread application within the realm of electrochemical energy storage.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2021
·
IF 6.707
Li Zhang,Xuerui Yang,Runsheng Zhou,Sen Lin,Lei Zhou
In this study, Ni/Co layered double hydroxide (Ni/Co-LDH) with uniform flake structure was synthesized successfully as an effective activator in the carbamazepine (CBZ) degradation by peroxymonosulfate (PMS). Our results indicated that Ni/Co-LDH possessed a high specific surface area (72.9942 m 2 /g) and exhibited great activation performance, in which 100% CBZ removal could be achieved within 300 s under neutral conditions with 5 mg/L Ni/Co-LDH and 0.3 mmol/L PMS. In addition, the crystal structure and morphology of the prepared Ni/Co-LDH kept unchanged during degradation cycles. X-ray photoelectron spectroscopy (XPS) analysis and free radical identification experiment speculated that the cycle of Ni 2+ /Ni 3+ and Co 2+ /Co 3+ on Ni/Co-LDH surface were responsible for efficient HO•/SO 4 •− generation from PMS. Based on identified products through high resolution mass spectrometry (HR-MS), it was proposed that the degradation pathway of CBZ was a heterozygous process involving deamidation, hydroxylation and electron transfer. The ECOSAR calculation results indicated the toxicity of some products was still at very toxic level, thus certain attention should be paid to the toxicity of intermediates in the process of treating pollutants in water.
研究领域:
环境科学
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化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Energy Storage
·
2024
·
IF 8.9
P.S. Dighe,R.S. Redekar,N.L. Tarwal,P.B. Sarawade
Because of the high energy demand, hybrid supercapacitors (HSC) are one of the best options in energy storage systems. The energy demand can be fulfilled by achieving superior energy density . Recently, layered double hydroxides (LDHs) have been favoured as magnificent supercapacitive electrode materials due to their capability of storing high energy density using their tuneable layered structure. In this study, we have synthesized nickel‑cobalt layered double hydroxide on nickel foam (Ni-Co LDH/NF) by utilizing a low-cost hydrothermal technique to obtain high energy density. To monitor the effect of the morphological aspects on electrochemical performance, reaction time during synthesis was varied. The structural and compositional studies confirmed Ni-Co LDH deposition on the Ni-foam. The morphological analysis showed highly interconnected nanosheets which efficiently provided fast transport pathways for electrons and electrolyte ions. The Ni-Co LDH/NF film synthesized at 6 h delivered a distinguished rate capability with a specific capacitance of 1577 F/g at 1 mA/cm 2 . Notably, a fabricated aqueous asymmetric supercapacitor showed a good energy density of 38 Wh/kg. These results highlighted the remarkable advantages of the binder-less nanosheet structure of the Ni-Co LDH for potential use in the supercapacitor application.
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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2021
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IF 4.539
Xiangying Yin,Xiaoyu Ma,Yi He,Hongjie Li,Yi Fan,Teng He,Xiao Guo,Li Chen
In the face of frequent oil spills and dye emissions, membrane technology is an efficient method to treat wastewater. However, selectivity , membrane fouling and high operating pressure are tricky problems for practical membrane applications. Hence, it is desirable to design a novel membrane with high selectivity, high flux and superior antifouling properties for gravity-driven separation of complex oily wastewater. In this study, bioinspired by sea urchins with good self-cleaning properties, an urchin-like Ni/Co layered double hydroxide (LDH) surface was grown onto stainless steel mesh (SSM) via a facile hydrothermal method . Due to the unique hierarchical architecture and surface chemistry, Ni/Co@SSM displays a robust self-cleaning oil-repellent ability without hydration. Combining the unique superwettability and highly porous nanostructure , Ni/Co@SSM could be used to separate various oil/water mixtures and emulsions efficiently under only gravity-driven conditions. In addition, Ni/Co@SSM exhibits great catalytic degradation ability of dye solutions in a short time. Notably, Ni/Co@SSM displays excellent physical, chemical and thermal stability in acidic, alkaline and saline environments. Consequently, Ni/Co@SSM possesses broad application prospects with superior self-cleaning and outstanding catalytic degradation ability of aromatic dyes. It shows promising application value in practical complex oily wastewater treatment without complicated operations and chemicals.
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
APPLIED CATALYSIS B-ENVIRONMENTAL
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2024
·
IF 20.2
Mengqing Hu,Di Zhao,Xinlong Yan,Yun Wang,Jin Zhang,Xiaoyan Hu,Ming Zhou,Porun Liu
Designing advanced bimetallic catalysts is essential to improving peroxymonosulfate (PMS) activation. Herein, a novel magnetic nickel/cobalt-layered double hydroxide decorated nitrogen-doped carbon (Ni/Co LDH@NC) catalyst we synthesized using carbonized ZIF-67 as a template for simultaneous removal of sulfamethoxazole (SMX) and Pb(Ⅱ) by PMS activation. The synthesized Ni/Co LDH@NC achieved complete degradation of SMX within 20 min and adsorbed Pb(Ⅱ) at 90.3 mg g −1 in 2 h. Notably, in simulated mixed wastewater, Ni/Co LDH@NC removed 100 % of SMX and simultaneously absorbed 84 % of Pb(Ⅱ) within 60 min. Density functional theory (DFT) studies revealed that synergistic Ni-Co sites and “bridging oxygen” vacancies enhanced electron transfer to PMS, facilitating O-O bond cleavage. The catalyst maintained high performance after four cycles, with over 85 % SMX degradation and 80 % Pb(Ⅱ) removal. This study highlights the potential of MOF-derived catalysts for efficient, simultaneous remediation of antibiotic and heavy metal pollutants, contributing to advanced wastewater treatment.
研究领域:
环境科学
·
材料科学
✓ 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）