α-Co(OH)2 nanoplates with excellent supercapacitive performance: Electrochemical preparation and characterization

Talat-Mehrabad, Jila; Aghazadeh, Mustafa; Maragheh, Mohammad Ghannadi; Ganjali, Mohammad Reza; Norouzi, Parviz

doi:10.1016/j.matlet.2016.08.069

Cited by 74 publications

(20 citation statements)

References 10 publications

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“…4a, shows absorptions at 3500 and 1632 cm À1 that are respectively assigned to the O-H stretching and H-O-H bending vibrations of water within the interlayer region. [46][47][48][49][50][51][52][53][54][55][56][57] The absorption at 3617 cm À1 is consistent with a non-hydrogen bonded O-H stretch in Co(OH) 2 . 53,56,58,59 The 630 cm À1 absorption is characteristic of the Co-O-H bending mode.…”

Section: Fourier-transform Infrared Spectroscopy Analysismentioning

confidence: 64%

Hydrous cobalt–iridium oxide two-dimensional nanoframes: insights into activity and stability of bimetallic acidic oxygen evolution electrocatalysts

et al. 2021

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Section: Fourier-transform Infrared Spectroscopy Analysismentioning

confidence: 64%

Hydrous cobalt–iridium oxide two-dimensional nanoframes: insights into activity and stability of bimetallic acidic oxygen evolution electrocatalysts

et al. 2021

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“…As shown in Figure S2b in the Supporting Information, two peaks at 1543 and 1235 cm −1 are ascribed to the stretching vibration CN of C 6 H 12 N 4 . An obvious sharp band at 1387 cm −1 is attributed to the characteristic peak of interlayer NO 3 − , confirming the presence of nitrate ions . The peaks at 1387 and 823 cm −1 could be indexed to the CH 2 bending vibration and deformation of CNC at 672 cm −1 , respectively .…”

Section: Comparison Of Tof Values For Some Non‐precious Metal Catalystsmentioning

confidence: 89%

A Simple and Scalable Route to Synthesize Co_xCu₁₋_xCo₂O₄@Co_yCu₁₋_yCo₂O₄ Yolk–Shell Microspheres, A High‐Performance Catalyst to Hydrolyze Ammonia Borane for Hydrogen Production

Lin

et al. 2019

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Yolk–shell structured micro/nano‐sized materials have broad and important applications in different areas due to their unique spatial configurations. In this study, yolk–shell structured Co3O4@Co3O4 is prepared using a simple and scalable hydrothermal reaction, followed by a calcination process. Then, CoxCu1−xCo2O4@CoyCu1−yCo2O4 microspheres are synthesized via adsorption and calcination processes using the as‐prepared Co3O4@Co3O4 as the precursor. A possible formation mechanism of the yolk–shell structures is proposed based on the characterization results, which is different from those of yolk–shell structures in previous study. For the first time, the catalytic activity of yolk–shell structured catalysts in ammonia borane (AB) hydrolysis is studied. It is discovered that the yolk–shell structured CoxCu1−xCo2O4@CoyCu1−yCo2O4 microspheres exhibit high performance with a turnover frequency (TOF) of 81.8 molhydrogen min−1 molcat−1. This is one of the highest TOF values reported for a noble‐metal‐free catalyst in the literature. Additionally, the yolk–shell structured CoxCu1−xCo2O4@CoyCu1−yCo2O4 microspheres are highly stable and reusable. These yolk–shell structured CoxCu1−xCo2O4@CoyCu1−yCo2O4 microsphere is a promising catalyst candidate in AB hydrolysis considering the excellent catalytic behavior and low cost.

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“…α-Co(OH) 2 with the similar crystal structure of α-Ni(OH) 2 also exhibits excellent ionic conductivity. Besides, α-Co(OH) 2 possesses ideal electronic conductivity 31,32 . But the anions between layered crystal structures can easily escape, especially in alkaline aqueous environment, which causes the unstable crystal structure of α-Ni(OH) 2 and α-Co(OH) 2 and the reduction in the interlamellar spacing 30,33,34 .…”

Section: Introductionmentioning

confidence: 99%

Heterojunction α-Co(OH)2/α-Ni(OH)2 nanorods arrays on Ni foam with high utilization rate and excellent structure stability for high-performance supercapacitor

Zhou

Wei

Zhang

et al. 2019

Sci Rep

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The practical implementation of supercapacitors is hindered by low utilization and poor structural stability of electrode materials. Herein, to surmount these critical challenges, a three-dimensional hierarchical α-Co(OH) 2 /α-Ni(OH) 2 heterojunction nanorods are built in situ on Ni foam through a mild two-step growth reaction. The unique lamellar crystal structure and abundant intercalated anions of α-M(OH) 2 (M = Co or Ni) and the ideal electronic conductivity of α-Co(OH) 2 construct numerous cross-linked ion and electron transport paths in heterojunction nanorods. The deformation stresses exerted by α-Co(OH) 2 and α-Ni(OH) 2 on each other guarantee the excellent structural stability of this heterojunction nanorods. Using nickel foam with a three-dimensional network conductive framework as the template ensures the rapidly transfer of electrons between this heterojunction nanorods and current collector. Three-dimensional hierarchical structure of α-Co(OH) 2 /α-Ni(OH) 2 heterojunction nanorods provides a large liquid interface area. These result together in the high utilization rate and excellent structure stability of the α-Co(OH) 2 /α-Ni(OH) 2 heterojunction nanorods. And the capacitance retention rate is up to 93.4% at 1 A g −1 from three-electrode system to two-electrode system. The α-Co(OH) 2 /α-Ni(OH) 2 //AC device also present a long cycle life (the capacitance retention rate is 123.6% at 5 A g −1 for 10000 cycles), a high specific capacitance (207.2 F g −1 at 1 A g −1 ), and high energy density and power density (72.6 Wh kg −1 at 196.4 W kg −1 and 40.9 Wh kg −1 at 3491.8 W kg −1 ), exhibiting a fascinating potential for supercapacitor in large-scale applications.

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α-Co(OH)2 nanoplates with excellent supercapacitive performance: Electrochemical preparation and characterization

Cited by 74 publications

References 10 publications

Hydrous cobalt–iridium oxide two-dimensional nanoframes: insights into activity and stability of bimetallic acidic oxygen evolution electrocatalysts

Hydrous cobalt–iridium oxide two-dimensional nanoframes: insights into activity and stability of bimetallic acidic oxygen evolution electrocatalysts

A Simple and Scalable Route to Synthesize Co_xCu₁₋_xCo₂O₄@Co_yCu₁₋_yCo₂O₄ Yolk–Shell Microspheres, A High‐Performance Catalyst to Hydrolyze Ammonia Borane for Hydrogen Production

Heterojunction α-Co(OH)2/α-Ni(OH)2 nanorods arrays on Ni foam with high utilization rate and excellent structure stability for high-performance supercapacitor

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α-Co(OH)2 nanoplates with excellent supercapacitive performance: Electrochemical preparation and characterization

Cited by 74 publications

References 10 publications

Hydrous cobalt–iridium oxide two-dimensional nanoframes: insights into activity and stability of bimetallic acidic oxygen evolution electrocatalysts

Hydrous cobalt–iridium oxide two-dimensional nanoframes: insights into activity and stability of bimetallic acidic oxygen evolution electrocatalysts

A Simple and Scalable Route to Synthesize CoxCu1−xCo2O4@CoyCu1−yCo2O4 Yolk–Shell Microspheres, A High‐Performance Catalyst to Hydrolyze Ammonia Borane for Hydrogen Production

Heterojunction α-Co(OH)2/α-Ni(OH)2 nanorods arrays on Ni foam with high utilization rate and excellent structure stability for high-performance supercapacitor

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Product

Resources

About

A Simple and Scalable Route to Synthesize Co_xCu₁₋_xCo₂O₄@Co_yCu₁₋_yCo₂O₄ Yolk–Shell Microspheres, A High‐Performance Catalyst to Hydrolyze Ammonia Borane for Hydrogen Production