Pine needle β-Co(OH)2 grown on Ni foam substrate for high specific capacitance and good cycling stability as advanced electrochemical pseudocapacitor materials

Fu, Weidong; Lü, Long; Wang, Meng; Yao, Yadong; Wei, Niandong; Yan, Minglei; Yin, Guangfu; Liao, Xiaoming; Huang, Zhongbing; Chen, Xianchun

doi:10.1016/j.jallcom.2015.01.089

Cited by 27 publications

(9 citation statements)

References 23 publications

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“…The peak intensity at 669 cm –1 corresponding to Co 2+ species gradually reduced with the increase in La/Co ratio and disappeared on catalyst La 1 Co 1 O 3 . Furthermore, no other characteristic bands between 1000 and 3500 cm –1 , suggesting the absence of impurities such as CoOOH and Co(OH) 2 in the sample …”

Section: Resultsmentioning

confidence: 99%

“…23,24 The sharp peak observed at 3607 cm −1 was ascribed to the bulk hydroxyl groups from La(OH) 3 . 23 Generally, the bands appearing around 3435 and 1629 cm 29 Textural Properties and Microstructures. The N 2 adsorption−desorption isotherms and their corresponding BJH pore size distribution curves of the samples are presented in Figure S2a and Figure S2b, respectively.…”

Section: ■ Introductionmentioning

confidence: 99%

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Perovskite-Type LaCoO₃ as an Efficient and Green Catalyst for Sustainable Partial Oxidation of Cyclohexane

Muhumuza

Tian

et al. 2020

Ind. Eng. Chem. Res.

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Perovskite-type LaCoO3 catalysts were studied for cyclohexane oxidation with molecular oxygen in a solvent-free system. Catalysts with various Lanthanum to Cobalt molar ratios were prepared through a modified citric acid procedure and characterized by different techniques. Among all catalysts, the best cyclohexane conversion results (8.3%) with a K/A oil (cyclohexanone and cyclohexanol) selectivity of 90% were obtained over LaCoO3 with a La to Co molar ratio of 1:1. The high catalytic activity on the perovskite-type LaCoO3 catalyst was explored by experimental and theoretical methods. Density functional theory-based calculations clarified the role of La and Co ions in oxygen and cyclohexane adsorption, respectively. The characterization results indicated that a single-phase LaCoO3 perovskite with a dominance of surface Co 3+ species and relatively high concentration of adsorbed oxygen species on the catalyst surface enhances the catalytic performance. This study presents insights into the design of a highly active, cost-effective, and green catalyst for cyclohexane partial oxidation.

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Section: Resultsmentioning

confidence: 99%

Section: ■ Introductionmentioning

confidence: 99%

Perovskite-Type LaCoO₃ as an Efficient and Green Catalyst for Sustainable Partial Oxidation of Cyclohexane

Muhumuza

Tian

et al. 2020

Ind. Eng. Chem. Res.

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“…In the case of pure Co(OH) 2 , a pair of redox peaks is observed, due to the following reversible reaction of Co(OH) 2 with OH – anions (Figure c), [Equation and Equation ]

normalC normalo {(normalO normalH)}_{2} + {O H}^{-} \leftrightarrow normalC normalo normalO normalO normalH + H_{2} normalO + e^{-}

normalC normalo normalO normalO normalH + {O H}^{-} \leftrightarrow normalC normalo O_{2} + H_{2} normalO + e^{-}

…”

Section: Resultsmentioning

confidence: 99%

One‐Step Synthesis of Co₃O₄/Graphene Aerogels and Their All‐Solid‐State Asymmetric Supercapacitor

et al. 2017

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A facile one-step hydrothermal strategy has been developed to prepare 3D porous Co 3 O 4 /graphene aerogel (Co 3 O 4 / GA). Due to the combination of a highly interconnected 3D network of GA and porous Co 3 O 4 nanospheres, the resulting Co 3 O 4 /GA electrode exhibits exceptional electrical conductivity and pseudocapacitance, making it an excellent material for energy-storage devices. The Co 3 O 4 /GA composites possess a high specific surface area of 127 m 2 g -1 and a broad pore-size distribution of 1-110 nm. The presence of porous Co 3 O 4 is found to be remarkably effective in enhancing the specific capacitance of the composite aerogel, up to 1512.7 F g -1 at 1 A g -1 . Furthermore, the combination of the two aerogel electrodes with a [a] LiOH/PVA-gel electrolyte endows our all-solid-state asymmetric supercapacitor (SASC) of Co 3 O 4 /GA//GA with a stable cycling performance in the high-voltage region of 0-1.6 V (capacitance retention of 81.5 % after 5000 continuous charge/discharge cycles), and superior electrochemical performance, with an energy density of 68.1 W h kg -1 at a power density of 982.9 W kg -1 , which is even higher than the maximum energy density of 58.7 W h kg -1 at a power density of 1209.4 W kg -1 of this ASC in a liquid-state electrolyte. These results indicate that Co 3 O 4 /GA could be a potential candidate in the field of supercapacitors.ionic conductivity, toxicity, and easy leakage, which limits their large-scale application. To solve this problem, the all-solid-state ASC has been extensively explored, due to its portability, environmental friendliness, and stability.The key to achieving high energy and power densities in allsolid-state ASCs is to choose electrode materials with excellent electrochemical properties. Intensive efforts have been devoted to ASCs with higher energy and power density by exploring various redox-active materials, such as Co 3 O 4 @Ni(OH) 2 //graphene, CNT/MnO 2 /GR//CNT/PANI, graphene/Ni(OH) 2 //AC, Ni@rGO/ Co 3 S 4 //Ni@rGO/Ni 3 S 2 , and so on. [7][8][9][10] Nevertheless, a simple synthesis method for the development of porous three-dimensional (3D) metal oxides is still a challenge. Porous metal oxides usually show different physical properties than bulk materials. [11,12] A porous 3D structure is beneficial for improving electrochemical properties, because the short ion-diffusion path and the high surface area provide more efficient contact between the electrolyte ions and active materials for faradic energy storage. [13] So, it is essential to develop a new energystorage material with abundantly porous, nanostructured, large surface-area characteristics.Among the many metal oxides, Co 3 O 4 is one of the most promising materials for low-cost and environment-friendly ASC devices with high specific capacitance. [14,15] The usual methods for the synthesis of porous Co 3 O 4 , through the calcination process, easily cause the collapse of the material structure, resulting in limited practical applications. Moreover, the intrinsic nature of transition-metal...

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“…The weight loss at 385 C to 510 C is ascribed to the removal of small molecules, such as HF, and the conversion of Co 0.6 Zn 0.4 (OH)F to CoZnO 2 , 26,27 with a mass loss rate of 14.39%. The weight loss at 510 C to 583 C is attributed to the conversion of Co 2 ZnO 4 to CoZnO 2 , [28][29][30][31] and the rate of mass loss was 2.82%.…”

Section: Dft Calculationsmentioning

confidence: 99%

Bimetallic hydroxyl fluoride with high‐rate lithium storage performance: Co _0. ₆ Zn ₀ _.4 ( OH )F material

Liu

Zhu

Liu

et al. 2022

Intl J of Energy Research

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In this study, we synthesized a bimetal hydroxyl fluoride, Co 0.6 Zn 0.4 (OH)F, with an overlapping nanoneedle structure using a simple hydrothermal method. The synthesized Co 0.6 Zn 0.4 (OH)F was used as a new electrode material to study its electrochemical performance. Because of the synergy between Co and Zn and the high ionicity of fluorides, the Co 0.6 Zn 0.4 (OH)F electrode exhibited a discharge capacity of 1355.5 mAh g À1 during the first charging and discharging cycle. After 400 cycles at a current density of 2 A g À1 , the Co 0.6 Zn 0.4 (OH)F electrode showed an excellent specific capacity of 756 mAh g À1 . The Co 0.6 Zn 0.4 (OH)F electrode also exhibited an excellent capacitance contribution rate, indicating good rate performance. In addition, the hydroxyl and oxygen vacancies in the electrode material promoted the lithium/ dilithium reactions. Therefore, Co 0.6 Zn 0.4 (OH)F is an excellent lithium storage material with high rate; thus, it has a certain potential application value in the future.bimetallic fluoride, Co 0.6 Zn 0.4 (OH)F, electrochemical characteristics, LIBs, nanoneedle | INTRODUCTIONPresently, various portable and fixed electronic devices and electric vehicles use lithium-ion batteries (LIBs) as a power source. [1][2][3] Currently, common mechanisms, such as anodic material lithiation, 4 alloying, 5 and conversion reactions, 6 have been developed, and several battery systems, particularly carbon, 7 silicon, 8 and lithium-based systems 9 have been used. The electrochemical

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Pine needle β-Co(OH)2 grown on Ni foam substrate for high specific capacitance and good cycling stability as advanced electrochemical pseudocapacitor materials

Cited by 27 publications

References 23 publications

Perovskite-Type LaCoO₃ as an Efficient and Green Catalyst for Sustainable Partial Oxidation of Cyclohexane

Perovskite-Type LaCoO₃ as an Efficient and Green Catalyst for Sustainable Partial Oxidation of Cyclohexane

One‐Step Synthesis of Co₃O₄/Graphene Aerogels and Their All‐Solid‐State Asymmetric Supercapacitor

Bimetallic hydroxyl fluoride with high‐rate lithium storage performance: Co _0. ₆ Zn ₀ _.4 ( OH )F material

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Pine needle β-Co(OH)2 grown on Ni foam substrate for high specific capacitance and good cycling stability as advanced electrochemical pseudocapacitor materials

Cited by 27 publications

References 23 publications

Perovskite-Type LaCoO3 as an Efficient and Green Catalyst for Sustainable Partial Oxidation of Cyclohexane

Perovskite-Type LaCoO3 as an Efficient and Green Catalyst for Sustainable Partial Oxidation of Cyclohexane

One‐Step Synthesis of Co3O4/Graphene Aerogels and Their All‐Solid‐State Asymmetric Supercapacitor

Bimetallic hydroxyl fluoride with high‐rate lithium storage performance: Co 0. 6 Zn 0 .4 ( OH )F material

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Perovskite-Type LaCoO₃ as an Efficient and Green Catalyst for Sustainable Partial Oxidation of Cyclohexane

Perovskite-Type LaCoO₃ as an Efficient and Green Catalyst for Sustainable Partial Oxidation of Cyclohexane

One‐Step Synthesis of Co₃O₄/Graphene Aerogels and Their All‐Solid‐State Asymmetric Supercapacitor

Bimetallic hydroxyl fluoride with high‐rate lithium storage performance: Co _0. ₆ Zn ₀ _.4 ( OH )F material