ChemCatChem
·
2019
·Vol. 11
·期 10
·2520-2525
·
IF 4.495
Jiali Sheng,Jiahui Chen,Jiahui Kang,Yan Yu,Ning Yan,Xian-Zhu Fu,Rong Sun,Ching-Ping Wong
Graphical Yolk-shell nanocages : Unique octahedral yolk-shell Cu 2 O@Co(OH) 2 nanocages composed of crystalline Cu 2 O core and amorphous Co(OH) 2 shell are fabricated by a facile Cu 2 O self-templated strategy at room temperature. The as-prepared yolk-shell Cu 2 O@Co(OH) 2 nanocages demonstrate superior electrocatalytic activity for glucose oxidation due to the sufficient active sites and large surface area, synergistic effect between Cu 2 O and Co(OH) 2 , which are benefited from the special yolk-shell nanocages. Unique octahedral yolk-shell Cu 2 O@Co(OH) 2 nanocages are synthesized by a facile Cu 2 O self-templated strategy as efficient glucose oxidation electrocatalysts. Amorphous Co(OH) 2 nanoflakes are formed as octahedral shells through coordinating etching conversion from part of Cu 2 O templates. The un-etched crystalline Cu 2 O octahedrons are then remained as cores and voids exist between the cores and shells. The special structure endow these yolk-shell heterostructure nanocages with abundant active sites, large surface area, and synergistic effect between Cu 2 O and Co(OH) 2 . The octahedral yolk-shell Cu 2 O@Co(OH) 2 nanocages demonstrate superior electrocatalytic activity for glucose oxidation in terms of high sensitivity of 1340 μA cm −2 mM −1 , low detection limit of 2 μM, wide linear sensing range, and long-term stability. This strategy might shed lights on the synthesis of various yolk-shell heterostructure nanocages with controllable structures and enhanced catalytic performances.
研究领域:
材料科学
·
电化学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2024
·
IF 4.1
Xingnian Duan,Jianmei Cen,Xiaoyu Qiu,Xixiang Liu
The development of high-performance and cost-effective electrocatalysts for oxygen evolution reactions (OER) is key to renewable energy conversion and storage technologies. In this paper, a hierarchical Co(OH) 2 -MoO 3 nanosheets with petal-like architecture was prepared by a simple one-step hydrothermal method using ZIF-67/NF as a precursor, and it was used as a direct electrocatalyst for OER. Notably, this petal-like Co(OH) 2 -MoO 3 /NF layered nanosheets not only prevent the agglomeration of nanostructured material , but also facilitate the complete penetration and diffusion of electrolyte. In addition, due to the strong electronic interaction between Co(OH) 2 and MoO 3 in the Co(OH) 2 -MoO 3 /NF system, Co(OH) 2 -MoO 3 /NF exhibits excellent electrocatalytic OER performance. It has a low overpotential of 273 mV at 10 mA cm −2 and excellent stability. This study provides a simple and effective strategy for the rational design and structural evolution of MOF-derived materials to achieve inexpensive and effective electrocatalysis.
研究领域:
材料科学
·
能源化学
·
电催化
✓ 已验证
产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2025
·
IF 2.5
Mengyin Liao,Chao Wang,Xuanhua Zhang,Chao Luan,Wenyuan Xu,Zhongyi He
Novel Pt/Co(OH)2-NiO/C catalysts based on carbon black were successfully synthesized using the hydrazine hydrate reduction method and galvanic replacement strategies. They were subsequently tested for their activity in the electrocatalytic oxidation of methanol. It was observed that the peak current density of Pt/Co(OH)2-NiO/C (8.29 A mg-1Pt) was 22.4 times higher than that of commercial Pt/C-JM (0.37 A mg-1Pt). The electrocatalytic activities and durabilities of the synchronously synthesized Pt/Co(OH)2-NiO/C catalysts were significantly better than those of PtCo/C, PtNi/C, and PtCoNi/C-X (X = 200, 400, 600) catalysts synthesized by calcination in Ar at different temperatures. The reason is that the highly dispersed Pt helps to expose more active sites on the catalyst surface, and the addition of Co(OH)2 and NiO alters the electron density of Pt, which reduces the adsorption of intermediate CO, attenuates the toxic effect, and enables more efficient oxidation of methanol.
研究领域:
材料科学
·
电化学
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催化领域
✓ 已验证
产品关联
DOI
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.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
INORGANICA CHIMICA ACTA
·
2025
·
IF 3.2
Lei Yuan,Yuanzhen Liu,Zhenyu Zhu,Na Xin,Liwei Zhang,Chunming Xu
We introduce Co(OH)₂/Ni₂Co (PO₄)₂ composite nanomaterials, synthesized via hydrothermal synthesis, as potential high-stability cathode materials for hybrid supercapacitors (HSCs). Structural characterization tests, such as XRD, SEM, HRTEM, and XPS, revealed the subtleties of the morphology, structure, and composition of these nanostructures. The electrode material exhibits an ultra-high capacitance of 2131.2 F g −1 at 1 A g −1 . When combined with activated carbon (AC), the resulting HSC exhibits a high capacitance of 123.2 F g −1 and remarkable cycle life, with 94.6 % capacitance retention after 12,000 cycles. The device achieves an energy density of 39.5 Wh kg −1 at 750 W kg −1 . This study meticulously details the synthesis, structural characterization, and extensive electrochemical analysis, culminating in their effective application in HSCs.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Zhijia Liao,Ninghao Chu,Zhenyu Yuan,Yanbai Shen,Fanli Meng
This study successfully synthesized “silver ear-like” Co(OH)F using 15 nm SiO 2 spheres as seeds. Gas sensitivity of Co(OH)F with and without SiO 2 spheres to toluene was compared at different annealing temperatures. The results demonstrate that the Co(OH)F-Si-350 sensor exhibits optimal gas sensitivity to toluene, with a response of 35 (R g /R a ) to 100 ppm of toluene at 220℃, with response and recovery times of 50 s and 80 s, respectively. Notably, the sensor detected toluene concentrations as low as 50 ppb, indicating good sensitivity to low concentrations. These findings suggest that the structural transformation resulting from the introduction of SiO 2 nanospheres, forming ultra-thin nanosheet clusters (∼12 nm), provides abundant active sites, effectively promoting substance diffusion and adsorption/desorption processes. Additionally, the incorporation of fluorine enhances the Lewis acidity of the material, facilitating the formation of stable adsorption states for gas molecules on the surface. These results reveal the significant impact of the structural transformation caused by the introduction of SiO 2 nanospheres on gas sensitivity, providing a strong theoretical foundation for further optimizing gas sensor design.
研究领域:
材料科学
·
传感器技术
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
·
2022
·Vol. 39
·期 2
·219-223
·
IF 2.726
Xiao Long,Wu Huirong,Zhang Yong,Sun Hao,Zhang Wenchao,Lyu Fenglei,Deng Zhao,Peng Yang
O xygen evolution reaction(OER) plays a key role in the electrochemical conversion and storage processes, but the sluggish kinetics of OER strongly impedes its large-scale applications. We herein reported the in situ growth of Fe-benzenedicarboxylate(Fe-BDC) on Co(OH) 2 nanoplates[Fe-BDC/Co(OH) 2 ] that showed remarkably enhanced OER activity than the pristine Co(OH) 2 . The incorporation of Fe species could enhance the intrinsic OER activity of Co and BDC could increase the electrochemically active surface area(ECSA), thus resulting in dramatically enhanced OER activity. In situ Raman spectroscopy characterization disclosed that Fe-CoOOH reconstructed from Fe-BDC/Co(OH) 2 was the real active site for OER. This work highlights the significance of rational tailoring of the nanostructure and electronic structure of Co(OH) 2 and provides more opportunities for its widespread applications.
研究领域:
材料科学
·
电化学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
Nanoscale
·
2024
·Vol. 16
·期 16
·8162-8176
·
IF 5.8
Xinmeng Zhang,Mingyue Bai,Lei Ge,Yuanyuan Yao
The slow redox rate of hydrogen peroxide (H2O2) in neutral environments makes the H2O2 sensor inadequate for the detection of low levels of signalling molecules. The aim of this study is to fabricate a flexible sensing electrode by hydrothermally loading micro-nanometer Ni and Co(OH)2 on carbon cloth (CC) and electrochemically depositing poly(3,4-ethylenedioxythiophene) (PEDOT) on the surface of the electrode. The sensor presented high sensitivity (10.43 mA mM−1 cm−2), a wide detection range (0.033–120.848 mM), a low detection limit (0.92 nM), high stability, and excellent anti-interference performance in neutral solutions. Ni–Co(OH)2 provides abundant active sites while CC solves their agglomeration phenomenon and conductivity. The PEDOT film offers heightened conductivity, hydrophilicity, interfacial stability, and an electrochemically active surface area (ECSA). The side area of the chrysanthemum petal like PEDOT is 39 ± 7 times the bottom area, and PEDOT increases the ECSA of the composite to six times that of CC. Electrochemical precise control of PEDOT morphology to improve sensor performance provides a new strategy for the application of PEDOT in sensors.
研究领域:
材料科学
·
生物医学工程
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Chunyan Fan,Xuxin Song,Yao Tang,Zehao Zang,Yangyang Ren,Lanlan Li,Xiaofei Yu,Xiaojing Yang,Zunming Lu,Xinghua Zhang
Designing catalysts that simultaneously optimize both hydrogen and oxygen evolution reaction (HER and OER) emerges as a critical materials challenge. Co(OH)₂ is recognized as an effective OER electrocatalyst, but the low HER activity limits its application in overall water splitting. In this work, we synthesized sulfur (S) and selenium (Se) doped Co(OH) 2 catalysts with significantly enhanced HER activity using an electrochemical deposition method. The S-Co(OH) 2 and Se-Co(OH) 2 catalysts own low HER overpotentials of 48 mV and 59 mV at 10 mA cm −2 . And they require 1.56 V and 1.64 V at the same current density for water splitting, the sustain stable performance for > 100 h at current densities (100 mA cm −2 ) show their practical durability. Density Functional Theory (DFT) calculations and experimental results reveal that non-metal doping induces electronic reconfiguration of Co and optimizes the ΔG H* value for intermediate formation, thus accelerating hydrogen generation and enhancing the intrinsic HER activity. This work presents an effective strategy for incorporating non-metal elements into transition metal-based catalysts, and provides insight to boost HER intrinsic activity and achieve bifunctional catalytic performance for water splitting.
研究领域:
电化学
·
催化
·
材料科学
·
能量转换
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2016
·Vol. 5
·期 6
·2629-2639
·
IF 8.262
Xin Tong,Dajun Wu,Chi Zhang,Kenan Lian,Dayuan Xiong,Shaohui Xu,Yiping Zhu,Ruijuan Qi,Rong Huang,Lianwei Wang,Paul K. Chu
Conducting the hydrogen evolution reaction (HER) in an alkaline environment using a non-precious transition metal catalyst with high efficiency is challenging. Here, we report excellent HER activity achieved using three-dimensional (3D) tetsubo-like Co(OH)2 nanorods on a macroporous electrically conductive network (MECN) synthesized by a hydrothermal method. This unique framework comprises three levels of porous structures, including a bottom-ordered MECN substrate, an intermediate layer of vertically porous Co(OH)2 nanowires with a mean diameter of 100 nm and length of about 2 μm, and outmost Co(OH)2 nanosheets (≈20 nm). The 3D array structure with a large aspect ratio provides a large specific surface area and exposes more active sites to catalyze electrochemical reactions at the electrode–electrolyte interface. Compared with Co(OH)2 nanosheets on an MECN and foamy Co(OH)2 on an MECN structure, the synthesized architecture has excellent HER catalytic reactivity, including a low potential of −69.2 mV vs. RHE, a cathodic current density of 10 mA cm−2, a small Tafel slope of 61.9 mV dec−1, a high current density, and robust catalytic stability in 1 M KOH, and is promising in HER applications.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
FUEL
·
2023
·
IF 7.4
Jie Yu,Zhuoran Hou,Huayu Zhang,Xinsheng Zhou
The fabrication of electrode materials with a high specific capacitance is essential for the development of enhanced performance supercapacitors. A novel binder-free electrode material, composed of MnS/Ni 3 S 2 and Co(OH) 2 , was synthesized on nickel foam by hydrothermal, sulfuration, and electrodeposition techniques. The MnS/Ni 3 S 2 exhibited a unique flower-like structure, resulting in a high specific capacitance of 1780 F g −1 at 1 A/g. By optimizing the synthesis conditions through several characterization and electrochemical tests, the MnS/Ni 3 S 2 @Co(OH) 2 composite was obtained, which displayed an ultrahigh specific capacitance of 2495 F g −1 at 1 A/g and a capacitance retention rate of 86.1% after 5000 cycles at 10 A/g in three-electrode system. The synergistic coupling of MnS/Ni 3 S 2 and Co(OH) 2 , along with the conductive nickel foam substrate, donated towards the excellent electrochemical performance. Furthermore, the MnS/Ni 3 S 2 @Co(OH) 2 //AC asymmetric supercapacitor (ASC) device was constructed with MnS/Ni 3 S 2 @Co(OH) 2 as positive electrode, activated carbon (AC) as negative electrode and 1 M KOH solution as electrolyte, demonstrated a high energy density of 68.6 Wh kg −1 at 750 W kg −1 and excellent cycle stability with 91.2% capacitance retention after 10,000 cycles at 15 A/g. The outstanding electrochemical properties observed in both the pre-electrodeposition and post-electrodeposition samples indicate the effectiveness of reasonable design and construction of composite as a pathway for producing electrode materials with exceptional performance.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Yu Tian,Xiaoru An,Xiaonan Du,Dalei Chang,Hong Li,Yue Hua,Xiuling Zhang,Jingsen Zhang,Lanbo Di
α-Co(OH) 2 has important applications in environmental, energy and catalysis applications. However, a complicated and harsh process is required for its production. Therefore, it is necessary to develop a rapid, facile, and green approach for the controllable synthesis of α-Co(OH) 2 . In this study, we successfully synthesized α-Co(OH) 2 supported on multiwalled carbon nanotubes (MWCNT) (α-Co(OH) 2 /MWCNT) by the plasma treatment of a mixture of cobalt nitrate and MWCNT in water without adding any other chemical reagents. The controllable synthesis of α-Co(OH) 2 was achieved only by adjusting the plasma conditions and support functionalization. The reduction of p -nitrophenol (4-NP) as a model using NaBH 4 was used to evaluate the performance of the obtained α-Co(OH) 2 /MWCNT catalysts. The results revealed that the sample prepared with 15 min of plasma treatment using H 2 /Ar as the working gas (α-Co(OH) 2 /MWCNT-15) had a good crystalline phase structure and showed excellent 4-NP reduction performance with a reaction rate constant as high as 1.97 min −1 . Structural characterization and electrochemical analyses of the different catalysts indicated that α-Co(OH) 2 /MWCNT-15 contains abundant defects, a large layer spacing, and abundant lattice sites for hydrogen adsorption, which are conducive to the adsorption of more active hydrogen species and 4-NP, and thus lead to significantly accelerated catalytic reduction of 4-NP.
研究领域:
材料科学
·
环境科学
·
催化化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）