Journal of Nanostructure in Chemistry
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2023
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IF 10.1
Yu Dexin,Zhang Feng,Yu Kai,Qu Fengyu
Cobalt-based Layered double hydroxides (Co-LDHs) through designing composite nanostructures and heterogenous junctions, has absorbed an increased concern for dual-function applications including electrochemical sensing and energy devices. Herein, the g-C 3 N 4 and GO are applied as two-dimensional (2D) scaffolds for one-pot synthesis of 2D α/β-Co(OH) 2 phase junction (α/β-Co(OH) 2 /g–C 3 N 4 /rGO, denoted as CCG) in dopamine sensing and oxygen evolution reaction (OER). The coexist of hetero-phase structure (α and β-Co(OH) 2 ) toward crystalline phase has been confirmed by various techniques. Dependent on hetero-phase structural and compositional characteristics of CCG, CCG has revealed excellent electrochemical performance: a ranking sensing response to dopamine with ppb-level sensitivity and wide detection range; and high electrocatalytic ability (38.02 mV dec −1 ) with more stable catalytic capacity toward oxygen evolution reaction (OER). The above considerable potentials for CCG ascribes to the synergistic effect of heterostructure, phase structure along with defect of α/β-Co(OH) 2 .
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Journal of Materials Chemistry C
·
2022
·Vol. 10
·期 18
·7227-7240
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IF 8.067
Xinmeng Zhang,Zixuan Mao,Wanyin Ge,Jiajing Zhu,Yuanxiao Zhao
Surface microstructure regulation is an effective way to enhance the performance of sensing materials. Here, a hierarchical and flexible Brussels sprout-like Ni–Co(OH)2/rGO/carbon cloth (CC) composite was constructed by optimizing the morphology of Ni–Co(OH)2 microspheres and the addition amount of rGO. This sensor shows excellent reproducibility, high selectivity, and good stability. It shows a high sensitivity of 3.7391 mA mM−1 cm−2 in the 0.0388–124.0436 mM line detection range for H2O2 and 1.8457 mA mM−1 cm−2 in the 0.0300–2.0000 mM line detection range for glucose. The low limits of detection for H2O2 and glucose are 2.316 nM and 0.115 μM, respectively. The excellent electrochemical performance of the Ni–Co(OH)2/rGO/CC composite is attributed to its unique Brussels sprout-like microstructure. By studying the electrical conductivity, electrochemical active surface area, and hydrophilic–hydrophobic surfaces of the Ni–Co(OH)2/rGO/CC composite, the structure–performance relationship between the microstructure and sensing performance of the composite was further clarified. Moreover, the mechanism of CC, rGO, and the Ni–Co(OH)2 ternary composite in the sensing process is proposed. This study provides a new strategy for the construction of flexible wearable electrodes with high sensitivity.
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Journal of Materials Chemistry A
·
2021
·Vol. 9
·期 22
·13279-13287
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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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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2020
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IF 7.489
Ning Song,Shihuan Hong,Mengya Xiao,Yan Zuo,Enhui Jiang,Chunmei Li,Hongjun Dong
The application of NiCo-LDHs in the hydrogen evolution reaction (HER) is rarely reported because it is usually served as an effective electrocatalyst for oxygen evolution reaction (OER) owing to the essential chemical and electric structure features. It still is a challenge to realize the effective HER over NiCo-LDHs unless modified with noble metals . In this work, the noble-metal-free core–shell Co(OH) 2 @P-NiCo-LDH hybrid with dodecahedral hierarchical structure is prepared by the sacrificial template method along with subsequent phosphating process, which is available for the electrocatalytic HER. The fabricated Co(Ni) δ+ -P δ- bonding states on the surface of outer shell NiCo-LDH not only provide the abundant active centers but also reduce interfacial charge transfer resistance to enhance the HER activity. Meanwhile, the unique core–shell dodecahedral structure effectively avoids the agglomeration and restacking of NiCo-LDH nanosheets to improve the electrochemical stability. This work exploits a novel noble-metal-free modification strategy to expand the application of NiCo-LDH in HER.
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PubMed
高影响因子
ACS Omega
·
2019
·
IF 2.584
Bo Cao,Chunhua Luo,Jie Lao,Hanqing Chen,Ruijuan Qi,Hechun Lin,Hui Peng
Layered cobalt hydroxides are cost-efficient electrocatalysts for oxygen evolution reaction (OER) in the field of energy conversion. Herein, we developed a facile synthesis method of 3d transition-metal-doped α-Co(OH)2 nanomaterials mediated with ammonia in water–methanol at room temperature. The doping of Cu2+ and Ni2+ leads to flower-like nanostructures similar to pure α-Co(OH)2, whereas the doping of Fe2+ produces nanoparticles with more than 2 times larger surface area in comparison with the Cu2+- and Ni2+-doped nanoflowers. The obtained dispersion with the addition of Nafion can be used directly as an electrocatalyst for OER with excellent catalytic activity, especially that the overpotential of Fe2+ doped is as low as 290 mV at 10 mA cm–2 and the turnover frequency is improved by 3 times as compared with that of α-Co(OH)2. Furthermore, the catalyst can be loaded onto foam nickel, which presents excellent durability with the current density unchanged under continuous chronoamperometry reaction for as long as 12 h and almost quantitative faradaic efficiency. The superior electrocatalytic properties combined with the simple synthesis without the tedious purification procedure is very promising for OER.
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Materials Science and Engineering B-Advanced Functional Solid-State Materials
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2023
·
IF 3.6
Bairui Tao,Honglin Zheng,Jiao Li,Fengjuan Miao,Peng Zhang
The construction and development of enzyme-free sensors made of non-precious metals that are extremely sensitive to glucose is of great importance for treatment of diabetes. A room temperature reaction method was used to grow ZIF-67@GO nanocubes on nickel foam substrates, followed by a hydrothermal method to construct Co(OH) 2 nanomaterials . From this NF/ZIF-67@GO/Co(OH) 2 enzyme-free glucose sensor with a unique structure was designed. The results and the charge transfer process of glucose's catalytic oxidation detection were systematically investigated in the composite material. The experimental results show that this sensor exhibits good electrochemical activity for glucose detection. It has a linear range of 0.1 μM-8.546 mM, a very high sensitivity of 2412.7 μA mM −1 cm −2 , and its low detection limit is 0.934 M (signal-to-noise ratio of 3). These results indicate that the sensor is capable of accurately and sensitively detecting glucose concentration and has great potential for use in practical applications. The synthesis method is simple, fast, low-cost and easy to apply to electrochemical electrodes. Besides, the material has reproducibility, stability and good selectivity .
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2019
·
IF 3.375
Zhongde Wang,Wei Kong,Lianxi Si,Junjian Niu,Ye Liu,Longping Yin,Zhigang Tian
A superhydrophobic and superoleophilic material-modified stainless-steel (SS) mesh filter was successfully fabricated by the deposition of hierarchical butterfly-like micro/nanostructured Co(OH)2 on the SS mesh with the unipolar pulse electrodeposition method, followed by modification with hexadecyltrimethoxysilane (HDTMS) and applied to the separation of hot and corrosive oil/water mixtures. The obtained Co(OH)2/HDTMS SS mesh filter exhibited both superhydrophobicity (water contact angle as high as 157.9°) and superoleophilicity (oil contact angle of 0°) and excellent performance for the separation of oil/water mixtures under high temperature (up to 160 °C) and corrosive and ultrasonic conditions with long-term storage and reusability. It is expected that the present fabrication process could be applied to tuning the robust and thermally stable micro/nanostructures on the porous substrates for the oil/water separation under harsh conditions.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2019
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IF 4.084
Huasheng Jiang,Zining Wang,Palanisamy Kannan,Hui Wang,Rongfang Wang,Palaniappan Subramanian,Shan Ji
Metal/metal hydroxide hybrid heterostructures exhibits superior performances in diverse research fields, especially in catalysis due to the presence of ample grain boundary interfaces and the strong metal/metal hydroxide synergistic actions. Herein, Co(OH) 2 -Ni hybrid heterostructures with a crystalline Ni and Co(OH) 2 is prepared on the cotton fabric substrate by a simple electrochemical process . The Co(OH) 2 -Ni hybrid heterostructures are explored as a highly active catalyst for the electro-oxidation of hydrazine in an alkaline medium . The existence of ample grain boundary interfaces and promotional synergistic effect between the nanocrystalline metallic Ni and Co hybrid heterostructures lead to a very low-onset hydrazine oxidation potential of −0.06 V vs RHE. Moreover, the Co(OH) 2 -Ni hybrid heterostructured electrode exhibits excellent long-term catalytic stability.
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Sustainable Materials and Technologies
·
2025
·
IF 9.2
Dan Xu,Yuwei Hua,Yanyan Huang,Yiming Zhao,Xin Chen,Jingyuan Zhang,Ge Chen,Guangyang Liu,Zhijian Wu,Xiaomin Xu,Donghui Xu
The rapid industrialization and extensive use of synthetic dyes have led to significant environmental pollution, particularly through dye wastewater, which poses severe ecological risks. Conventional single treatment methods often struggle to effectively remove complex and stable dye molecules. In this study, we developed COF-based chitosan hydrogel microspheres by combining COF-LZU1 and Co(OH)₂ via co-precipitation and self-assembly techniques. The synergistic effect between COF and Co(OH)₂ enabled simultaneous adsorption and degradation of neutral red, significantly enhancing the adsorption capacity. Under optimal conditions (15 mg of composite material, 20 min reaction time, pH = 7), the composite exhibited an adsorption capacity of 1325.48 mg/g and a degradation efficiency of 100 %, surpassing the performance of most conventional adsorbents. Furthermore, the incorporation of Co(OH)₂ into COF enhanced the stability of the composite material, as indicated by thermodynamic analysis and adsorption performance across different component ratios. Adsorption process modeling revealed that the adsorption kinetics fit well with the Elovich model, while isothermal adsorption followed the Langmuir model. Among common interfering substances, CH₃COO − was found to enhance the catalytic process, whereas humic acid inhibited it. Quenching experiments and EPR analysis confirmed that superoxide anion radicals (•O₂ − ) and singlet oxygen ( 1 O₂) were the primary active species in the catalytic process, with hydroxyl radicals (•OH) playing a relatively minor role. This study highlights the synergistic interaction of COF and Co(OH)₂ in improving adsorption performance, stability, and catalytic efficiency, providing a novel strategy for the preparation of advanced composite materials and new insights into pollutant removal mechanisms.
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CHEMICAL ENGINEERING JOURNAL
·
2026
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IF 12.5
Yingxia Wei,Zhangwei Li,Farhat Nosheen,Xueyan Wu,Rui Xue,Xingyun Li,Yan Lv,Jixi Guo,Dianzeng Jia
Direct seawater electrolysis for hydrogen production faces significant challenges, particularly regarding stability due to chlorine corrosion and oxidation. Herein, we present an earth-abundant alkaline seawater oxidation electrocatalyst (CO 3 2− -Co(OH) 2 @FeOOH) capable of sustained electrolysis for 5000 h without a significant attenuation at 1 A cm −2 , achieving 100% oxygen Faradaic efficiency. This multilayer electrode, featuring an amorphous FeOOH coating on crystalline cobalt carbonate hydroxide, not only generates a CoFe (oxy)hydroxide active layer but also effectively inhibits the release of CO 3 2− into the electrolyte during the reconstruction process. The synergistic effect of CO 3 2− and the distinct structure contributes to the catalyst's high activity, selectivity, and corrosion resistance. The constructed Pt/C/NF||CO 3 2− -Co(OH) 2 @FeOOH electrochemical cell achieves seawater electrolysis of 500 mA cm −2 at 1.80 V cell voltage, resulting in a power consumption of only 4.30 (kWh m −3 H 2 ). The voltage of the anion exchange membrane electrolyzer remains stable after 600 h of continuous operation at 500 mA cm −2 . The calculated gasoline-equivalent (GGE) per gallon of H 2 is as low as $0.96. This work emphasizes the synergistic effect of multilayer electrodes and anions. and provides a potential catalyst for commercialization.
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INDUSTRIAL CROPS AND PRODUCTS
·
2023
·
IF 5.9
Kaiyuan Liu,Zuozhu Yin,Renkang Luo,Bingrui Qiu,Yuhua Chen,Chenggang Yang,Yidan Luo,Zhen Hong,Mingshan Xue
The discharge of industrial oily wastewater is threats to the environment. A long-lasting Co(OH) 2 /stearic acid (STA)-based superhydrophobic/superoleophilic nanocellulose-based membrane (SSNM) for extremely effective oil/water and simultaneous removal of soluble dye was created to offer solutions to this problem. The mechanical durability of the prepared Co(OH) 2 /STA-based SSNMs was reinforced by depositing Co(OH) 2 and STA on the cellulose fibers. The Co(OH) 2 /STA-based SSNM shows a high water contact angle of 164 ± 2° and an oil contact angle of ∼0°, exhibiting excellent superhydrophobicity and superoleophilicity. With good usage stability, high separation efficiencies (>94.0%) and high separation fluxes (>130 L·m −2 ·h −1 ) were achieved for four oils. The separation flux and efficiency of N-hexane did not change obviously after repeated separation. Furthermore, it exhibited reliable photocatalytic ability, which contributed to the reduction of organic contamination. As a result, Co(OH) 2 /STA-based SSNM shows strong potential for practical applications such as oil/water separation and photocatalytic degradation of organic pollutants.
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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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