ACS Applied Nano Materials
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2022
·
IF 6.14
Le Zhang,Xin Zhou,Shaohua Chai,Jian Guan,Guijun Fan,Wuxinchen Yang,Guojun Ma,Ning Han,Yunfa Chen
There is a high demand to synthesize ozone decomposition catalysts especially in high-space-velocity and high-relative-humidity (RH) environments. Herein, two polymorphs of cobalt hydroxide, α- and β-Co(OH)2, are synthesized and applied for ozone elimination. β-Co(OH)2 shows ∼90% ozone decomposition efficiency under high space velocity (weight hourly space velocity (WHSV) = 1,200,000 mL g–1 h–1, 25 °C, 40 ppm), which is far higher than that of α-Co(OH)2 (∼5%). β-Co(OH)2 has high spin Co(II) in distorted octahedral coordination caused by the Jahn-Teller effect, leading to a higher crystal field splitting energy level and thus contributing to the easier electron transfer between the ozone and catalyst. Moreover, β-Co(OH)2 still shows high performance (∼87%) even in humid conditions (RH ∼50%, 25 °C, 40 ppm, WHSV = 600,000 mL g–1 h–1), which is attributable to its abundant surface non-hydrogen-bonded hydroxyls weakening water molecule adsorption, providing an idea to develop highly efficient catalysts for ozone decomposition in humid environments.
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高影响因子
FUEL
·
2025
·
IF 7.5
Yali Niu,Rui Yao,Shuhui Fan,Jinping Li,Guang Liu
Anion-exchange membrane water electrolyzers (AEMWE) are promising for clean hydrogen production. However, the high energy barriers associated with water adsorption and dissociation combined with the high adsorption energy of hydrogen intermediates (H*) in alkaline environment result in slow kinetics for the hydrogen evolution reaction (HER). To tackle this, we report a catalyst comprising Pt nanoparticles loaded on Co(OH) 2 /PTI nanosheets (Pt/Co(OH) 2 /PTI) for efficient alkaline HER at high current densities. Operando characterization indicates that Co(OH) 2 promotes H 2 O adsorption and dissociation, while the Pt nanoparticles optimize H* adsorption energy, enabling preferential H* adsorption at the Pt site to facilitate H 2 generation and desorption. Furthermore, the ultra-thin poly (triazine imide) (PTI) support prevents the Pt nanoparticles aggregation, thereby enhancing catalyst stability. As a result, the synergistic Pt/Co(OH) 2 /PTI achieves superior HER performance, demanding an overpotential of merely 7 mV to achieve a current density of 10 mA cm −2 and just 220 mV to drive 1 A cm −2 , and it maintains stable for over 220 h under the condition of 1 A cm −2 . Additionally, the electrolyzer assembled using Pt/Co(OH) 2 /PTI as the cathode demonstrates stable operation for 200 h at 0.5 A cm −2 under 70 °C, highlighting its strong potential for industrial applications.
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Nanomaterials
·
2025
·Vol. 15
·期 24
·
IF 4.3
Luan Liu,Hongru Liu,Zikang Chen,Genghua Cao,Xiaoyu Wu,Baorui Jia,Xuanhui Qu,Mingli Qin
A rapid solvent-free microwave-assisted strategy was developed to fabricate Pt- and Ni-modified Co(OH)2catalysts for alkaline hydrogen evolution. Among them, Ni-Pt@Co(OH)2, prepared via sequential Ni-first then Pt loading, exhibited the best performance. Structural analyses confirmed uniform Pt dispersion with dominant Pt(111) facets, while ICP-MS showed reduced Pt usage compared to Pt@Co(OH)2. Electrochemical measurements in 1.0 M KOH revealed an overpotential of 71 mV at 10 mA·cm−2, comparable to Pt/C, and a mass activity 4–6.5 times higher across 25–75 mV. EIS demonstrated lower charge-transfer resistance, and stability tests showed negligible degradation after 3000 CV cycles and 11 h continuous operation. The outstanding performance arises from enhanced Pt utilization, abundant conductive sites, and strong Ni-Pt interfacial synergy, highlighting Ni-Pt@Co(OH)2as a promising catalyst for efficient alkaline HER with reduced Pt consumption.
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PubMed
高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2019
·Vol. 166
·期 2
·B42
·
IF 3.12
Yongling Du,Yifeng He,Zhixiang Zheng,Xuan Shen,Yaxin Zhou,Tingxia Wang,Zhengping Zhu,Chunming Wang
Co(OH)2 nano particles (NPs)/three-dimensional graphene frameworks (3DGFs) nano-materials was fabricated via electrochemical methods. The Co(OH)2 NPs/3DGFs hybrid retain the 3DGFs's structure and have superior catalytic activity for glucose oxidation. The electrochemical sensors based on Co(OH)2 NPs/3DGFs exhibited high sensitivity of 2410 μA cm−2mM−1, wide linear range of 2 μM to 1.4 mM, low detection limits of 0.67 μM and a quick response (less than 3s) to glucose. The Co(OH)2 NPs/3DGFs were used as a high performance platform to detect glucose in human serum, fetal bovine serum, and human urine. The excellent catalytic activity of Co(OH)2 NPs/3DGFs is attributed to the high surface area of 3DGFs and the highly catalytic activity of Co(OH)2 NPs as well as the synergistic effects between Co(OH)2 NPs and 3DGFs. Importantly, the electrochemical glucose sensor could be renewable only being refreshed in 0.1 M NaOH for ten minutes.
研究领域:
生物医学工程
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材料科学
·
分析化学
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高影响因子
APPLIED SURFACE SCIENCE
·
2026
·
IF 6.9
Yifei Huang,Hongliang Dai,Hongye Bai,Weiqiang Fan
Biomass materials as an abundant renewable resource could replace traditional fossil fuels and non-renewable materials, providing a new solution to achieve sustainable development. In this paper, Ce-modified Co(OH) 2 /Cu 2 O composite catalysts were prepared by an electrodeposition method, and the CoOOH/CuOOH dual active sites were successfully obtained through an electrochemical reconfiguration strategy, and the experimental results showed that the incorporation of Ce induced the formation of high-valent Co and Cu species, which improved the activity of electrocatalytic HMF oxidation. At 0.55 V vs Hg/HgO, the HMF conversion reached 100%, the FDCA yield was 95.04% and the Faraday efficiency was up to 98.47%. These results confirm the effectiveness of Ce-based non-precious metal catalysts in electrochemical reconstruction strategies and demonstrate their potential application in the high-value conversion of biomass derivatives. This finding not only provides a solid research basis for the development of highly efficient catalysts, but is also expected to promote the development of related technological fields.
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高影响因子
ELECTROCHIMICA ACTA
·
2026
·
IF 5.8
Xiaojun Tang,Wenhao Lv,Song Lv
Customized Co(OH) 2 interface layer designed by electrodeposition. • The NF@[Co] 120 /Mn/[Co] 60 composite electrode integrates "conduction-adhesion-protection" functions. • Achieves high volumetric capacitance and excellent cycling stability. • Provide a novel design strategy for next-generation flexible and wearable energy storage devices. The in-situ synthesized nickel foam(NF)/manganese dioxide(MnO 2 ) electrode shows great promise for flexible supercapacitors owing to its high theoretical capacity, abundance, and eco-friendliness. However, the practical application of MnO 2 is hindered by poor conductivity, significant volume expansion, dissolution in electrolytes, and weak adhesion to smooth NF. To address these challenges, this work leverages the advantages of high conductivity and interface modification offered by Co(OH) 2 to precisely construct a sandwich-structured composite electrode(NF@[Co] 120 /Mn/[Co] 60 ) at the MnO 2 interface layer, which integrates conductive, adhesive, and protective functions. Benefiting from the advanced structure, the composite electrode exhibits outstanding electrochemical performance. NF@[Co] 120 /Mn/[Co] 60 achieves a capacitance of 340.31 F g −1 at 1 mA cm −2 , with a capacitance retention of 196.05 F g −1 when the current density increases to 20 mA cm −2 , and a capacity retention rate of 86.68% after 9000 cycles. Moreover, by utilizing the smooth and continuous macroscopic interface of the outermost Co(OH) 2 nanosheets, we integrated it with hydrogel electrolyte to assemble flexible supercapacitor (NF@[Co] 120 /Mn/[Co] 60 //PAA//AC). This device delivers an energy density of 74.95 Wh kg –1 at a power density of 994.94 W kg –1 and demonstrates excellent mechanical flexibility. This novel structural design provides a new electrode system strategy for the development of flexible wearable energy storage systems. Download: Download high-res image (197KB) Download: Download full-size image
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高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2026
·
IF 19.9
Runxian Zhu,Dalang Chen,Zetong Chen,Jianglin Liu,Xiaofei Wang,Yanlin Qin,Xueqing Qiu,Xuliang Lin
Efficient seawater oxygen evolution requires electrocatalysts that combine high activity, chloride tolerance, and long-term durability. Herein, a phosphorus–lignin ligand strategy is developed to construct an activation-prone P-CoMoO 3 @PLC precatalyst. Phosphorylated lignin enables homogeneous Co/Mo coordination, lattice P incorporation, oxygen-vacancy generation, and conductive carbon confinement, producing a metastable CoMoO 3 lattice with perturbed Co-P-Mo/Co-O-Mo coordination environments. P-CoMoO 3 @PLC requires only 180 mV at 10 mA cm −2 in simulated seawater, and sustains 500 mA cm −2 in natural seawater, outperforming commercial RuO 2 in durability. Operando analyses reveal an activation-induced dissolution–reconstruction pathway, in which partial Mo/P leaching converts the precatalyst into a Co(OH) 2 -derived CoOOH-rich interface coupled with residual CoMoO 4 . Co(OH) 2 -like species serve as hydroxylated intermediates, whereas CoOOH-like sites constitute the active OER phase; residual CoMoO 4 and the lignin-derived carbon matrix stabilize the reconstructed layer and promote charge transport. DFT calculations further show favorable *OH formation but thermodynamically unfavorable *Cl adsorption, explaining the preferential OER pathway and suppressed chlorine-related reactions. This work establishes bio-ligand metastability and reconstruction-driven interface engineering as a robust design strategy for seawater electrolysis.
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高影响因子
MICROCHIMICA ACTA
·
2022
·Vol. 189
·期 10
·1-13
·
IF 6.408
Wang Fang,Shi Fengna,Chen Cheng,Huang Kexin,Chen Naipin,Xu Ziqi
Cobalt hydroxide nanoparticles (Co(OH) 2 NPs) were uniformly deposited on flexible carbon cloth substrate (Co(OH) 2 @CC) rapidly by a facile one-step electrodeposition, which can act as an enzyme-free glucose and uric acid sensor in an alkaline electrolyte. Compositional and morphological characterization were examined by X-ray diffraction (XRD), scanning electron microscopy (SEM), and energy-dispersive X-ray spectroscopy (EDS), which confirmed the deposited nanospheres were Co(OH) 2 nanoparticles (NPs). The electrochemical oxidation of glucose and uric acid at Co(OH) 2 @CC electrode was investigated by electrochemical impedance spectroscopy (EIS), cyclic voltammetry (CV), differential pulse voltammetry (DPV), and chronoamperometry methods. The results revealed a remarkable electrocatalytic activity toward the single and simultaneous determination of glucose and uric acid at about 0.6 V and 0.3 V (vs. Ag/AgCl), respectively, which is attributed to a noticeable synergy effect between Co(OH) 2 NPs and CC with good repeatability, satisfactory reproducibility, considerable long-term stability, superior selectivity, outstanding sensitivity, and wide linear detection range from 1 uM to 2 mM and 25 nM to 1.5 uM for glucose and UA, respectively. The detection limits were 0.36 nM for UA and 0.24 μM for glucose (S/N = 3). Finally, the Co(OH) 2 @CC electrode was utilized for glucose and uric acid determination in human blood samples and satisfying results were obtained. The relative standard derivations (RSDs) for glucose and UA were in the range 6 to 14% and 0 to 3%, respectively. The recovery ranges for glucose an UA were 97 to 103% and 95 and 101%, respectively. These features make the novel Co(OH) 2 @CC sensor developed by a low-cost, efficient, and eco-friendly preparation method a potentially practical candidate for application to biosensors. Graphical abstract
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PubMed
高影响因子
IONICS
·
2022
·Vol. 28
·期 8
·3945-3956
·
IF 2.961
Wei Xuedong,Chai Yudan,Chen Weifeng,Liu Nan,Qiao Shuangyan
In this paper, an amorphous composite electrocatalyst of Co(OH) 2 -Ni(OH) x S y was prepared by a simple and rapid electrochemical deposition method on nickel foam (NF). The electrochemical performance for oxygen evolution reaction (OER) was tested in 1 M KOH solution. The overpotential of Co(OH) 2 -Ni(OH) x S y (Co:Ni = 9:1) electrode was 423 mV at 50 mA cm −2 . The potential of the Co(OH) 2 -Ni(OH) x S y (Co:Ni = 9:1) sample remained essentially unchanged from the initial potential of 1.651 V after 12 h of stability test. In this catalyst, the strong synergistic effect between cobalt and nickel ions, the greatly increased amorphous defect sites and oxygen vacancies, and the abundant electrochemical specific surface area together lead to the increased electrocatalytic activity and high electrocatalyst stability. This amorphous CoNi-based composite electrocatalyst prepared by simple electrodeposition has certain significance for the preparation of hydrogen energy.
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高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2020
·
IF 16.683
Yiwen Huang,Guijuan Wei,Jia He,Cuihua An,Min Hu,Miao Shu,Junfa Zhu,Shuang Yao,Wei Xi,Rui Si,Zhi-Ming Zhang,Changhua An
The exploration of highly-efficient oxygen evolution reaction (OER) electrocatalyst with well-defined structure to understand specific structure-performance relationship is crucial to meet the requirement of water-splitting. Herein, we firstly used atomically dispersed IrCl x to uniformly decorate ultrathin Co(OH) 2 nanosheets to dramatically improve electrocatalytic activity. The synthesized IrCl x -Co(OH) 2 nanosheets/carbon nanotubes (CNTs) exhibits an overpotential of 230 mV to reach 10 mA/cm 2 , which was much enhanced compared to that of pristine Co(OH) 2 /CNTs (308 mV) and commercial benchmark IrO 2 (309 mV). X-ray absorption fine structure and density functional theory simulations demonstrate strong interfacial interaction between IrCl x and Co(OH) 2 nanosheets via the Cl-Ir-O and Ir-Cl-Co bond can efficiently boost its electronic conductivity. The accelerated charge transfer promotes the formation of more positively charged O atoms around cobalt centers, which is beneficial for the deprotonation on IrCl x -Co(OH) 2 and makes the catalyst facilitate OER.
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高影响因子
APPLIED SURFACE SCIENCE
·
2018
·
IF 4.439
Linan Wang,Shuxian Zhuang,Liu Wang,Na Wang,Hengliang Mo,Yang Tang,Yongmei Chen,Yanzhi Sun,Pingyu Wan
Co(OH) 2 nanoflakes integrating with Cu nanoparticles were deposited on nickel foam (CuNps-Co(OH) 2 Nfs/Ni f ) by a green and facile one-step deposition method and used for non-enzymatic glucose sensors. The CuNps-Co(OH) 2 Nfs/Ni f composite was characterized by scanning electron microscopy, X-ray photoelectron spectroscopy and high resolution transmission electron microscopy. Electrochemical oxidation of glucose on the CuNps-Co(OH) 2 Nfs/Ni f composite was investigated by chronoamperometry and cyclic voltammetry. The prepared CuNps-Co(OH) 2 Nfs/Ni f electrode shows not only an extremely high sensitivity of 42.7 mA mM −1 cm −2 in the concentration range from 1 to 250 μM for glucose detection but also an obvious current response to glucose at a level of 1 μM with a low detection limit of 73 nM (S/N = 3). Moreover, the glucose sensor based on CuNps-Co(OH) 2 Nfs/Ni f also exhibits high recovery ratio toward real sample analysis. This work indicates that the fast electron transfer, large surface area, and highly effective active sites based on the hierarchical structure of ultra-thin and open-interlaced Co(OH) 2 Nfs interspersed by CuNps contribute to the excellent performance of CuNps-Co(OH) 2 Nfs/Ni f electrodes. The proposed one-step preparation of hierarchical nanostructure of CuNps and Co(OH) 2 Nfs provides a promising and efficient strategy in the development of outstanding non-enzymatic glucose biosensors.
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高影响因子
JOURNAL OF NANOPARTICLE RESEARCH
·
2016
·Vol. 18
·期 7
·1-11
·
IF 2.101
He Juan,Lu Xingping,Yu Jie,Wang Li,Song Yonghai
Abstract A novel Co(OH) 2 /glassy carbon electrode (GCE) has been fabricated via metal–organic framework (MOF)-directed method. In the strategy, the Co(BTC, 1,3,5-benzentricarboxylic acid) MOFs/GCE was firstly prepared by alternately immersing GCE in Co 2+ and BTC solution based on a layer-by-layer method. And then, the Co(OH) 2 with hierarchical flake nanostructure/GCE was constructed by immersing Co(BTC) MOFs/GCE into 0.1 M NaOH solution at room temperature. Such strategy improves the distribution of hierarchical Co(OH) 2 nanostructures on electrode surface greatly, enhances the stability of nanomaterials on the electrode surface, and increases the use efficiency of the Co(OH) 2 nanostructures. Scanning electron microscopy, energy dispersive X-ray spectroscopy, X-ray powder diffraction, energy dispersive spectroscopy, Fourier transform infrared spectroscopy, and Raman spectra were used to characterize the Co(BTC) MOFs/GCE and Co(OH) 2 /GCE. Based on the hierarchical Co(OH) 2 nanostructures/GCE, a novel and sensitive nonenzymatic glucose sensor was developed. The good performance of the resulted sensor toward the detection of glucose was ascribed to hierarchical flake nanostructures, good mechanical stability, excellent distribution, and large specific surface area of Co(OH) 2 nanostructures. The proposed preparation method is simple, efficient, and cheap . Graphical Abstract
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