Ammonia-induced construction of three-dimensional sea urchin-like Co(OH)2 @CuO structure for oxygen evolution reaction and supercapacitor

Xu, Haitao; Zhao, Yan; Zhao, Jingzhe

doi:10.1016/j.jallcom.2023.170944

Cited by 7 publications

(2 citation statements)

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“…It should be noted that the higher number of oxygen vacancies in O 1s is conducive to the active site for the catalytic hydrogen production reaction because of the strong affinity interaction between metal ions and OH ions. 40 Figure 2i shows the S peak of MnCo 2 O 4 @Co 9 S 8 -10 was obvious, which once again proves that S doping was successful. 27 The S 2p spectra can be deconvolved into two characteristic peaks of 162.08 and 163.18 eV, corresponding to S 2p 3/2 and S 2p 1/2 , respectively, which could be attributed to S 2− coordinated to Co metal ions.…”

Section: ■ Results and Discussionmentioning

confidence: 67%

“…Compared with the initial MOF, the ratio of lattice oxygen vacancy increases from 30.8 to 58.8%. It should be noted that the higher number of oxygen vacancies in O 1s is conducive to the active site for the catalytic hydrogen production reaction because of the strong affinity interaction between metal ions and OH ions Figure i shows the S peak of MnCo 2 O 4 @Co 9 S 8 -10 was obvious, which once again proves that S doping was successful .…”

Section: Resultsmentioning

confidence: 82%

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MOF-Derived Hollow Heterostructure MnCo₂O₄@Co₉S₈ Nanocages as a High-Performance Bifunctional Electrode for Water Electrolysis and Flexible Supercapacitor

Yuan,

Wang,

Luo

et al. 2023

Energy Fuels

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Bifunctional electrodes with high electrochemical activity for oxygen evolution reaction (OER) and capacitance characteristics are essential for overall water-splitting devices and supercapacitors. Here, the S-etched Co/Mn-metal−organic frameworks (Co/Mn-MOF) derivative (MnCo 2 O 4 @Co 9 S 8 -10) electrode with dodecahedral hollow heterostructure was prepared by a vulcanization strategy, which greatly improves the bifunctional activity of the electrode. Specifically, the OER requires low overpotentials of 297 and 340 mV to provide current densities of 100 and 500 mA cm −2 , respectively, and it remained stable in alkaline electrolyte for 300 h using a high current cycle test. The activity of the overall water-splitting electrolyzer did not decrease significantly even in alkaline simulated seawater, which means that it has a resistance to chlorine corrosion. In terms of capacitive performance, the MnCo 2 O 4 @Co 9 S 8 -10 electrode shows a specific capacitance of 1555.43 F g −1 at 0.5 A g −1 . The assembled MnCo 2 O 4 @Co 9 S 8 -10//AC battery−supercapacitor hybrid (BSH) has a high energy density of 154.18 W h kg −1 at 388.69 W kg −1 power density, and the capacitance retention rate is still as high as 93.4% after 50,000 cycles. The self-assembled flexible solid-state battery successfully lights up the LED board. These results demonstrate the wide applicability of the high-performance bifunctional MnCo 2 O 4 @Co 9 S 8 -10 electrode in supercapacitors, wearable electronic devices, water splitting, and even seawater electrolysis devices and reveal promising prospects with important implications for energy storage and hydrogen economy.

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Section: ■ Results and Discussionmentioning

confidence: 67%

Section: Resultsmentioning

confidence: 82%

MOF-Derived Hollow Heterostructure MnCo₂O₄@Co₉S₈ Nanocages as a High-Performance Bifunctional Electrode for Water Electrolysis and Flexible Supercapacitor

Yuan,

Wang,

Luo

et al. 2023

Energy Fuels

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Surface Engineering of Copper Foam to Construct a Hierarchical Heterostructure for High Energy Efficient Supercapacitors

Jia,

Wang,

Wang

et al. 2024

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As a unique pseudocapacitive material, the heterojunction‐structured CuO@Cu combines the high conductivity of substrate Cu and the high capacity of active CuO together for structure‐integral electrodes, however, its structural optimization and improved capacity are still the main challenges so far. In this study, an initial surface etching of copper foam (CF) is adopted to construct a primary heterostructure of CuO nanowires@CF (CuO NW@CF), and then, the surface decoration of CuO NW@CF via the deposition of cerium‐2‐methylimidazole based metal–organic frameworks (Ce‐2MI) finally results in the current‐collector‐/binder‐free electrodes of the hierarchical heterostructure Ce‐2MI@CuO NW@CF. Compared to the structural properties of CuO NW@CF, both the introducing Ce‐ion active sites and the enriched lattice oxygen vacancies cooperatively endow the pseudocapacitive electrodes of Ce‐2MI@CuO NW@CF with a ultrahigh specific capacitance and excellent cycling stability. Within the potential window of 1.6 V, the asymmetric supercapacitor devices of activated carbon//Ce‐2MI@CuO NW@CF acquire a high energy density of 56.8 Wh kg−1 at 725 W kg−1, which can light up a light‐emitting diode (LED) bulb for 20 min. Therefore, constructing the hierarchically heterostructured Ce‐2MI@CuO NW@CF is an effective approach to developing high‐performance supercapacitors for potential application purposes.

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Activating Co sites activity in Co(OH)2 via VN coupling to facilitate highly efficient oxygen evolution reaction

Tang,

Wan,

Liu

et al. 2024

International Journal of Hydrogen Energy

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Ammonia-induced construction of three-dimensional sea urchin-like Co(OH)2 @CuO structure for oxygen evolution reaction and supercapacitor

Cited by 7 publications

References 61 publications

MOF-Derived Hollow Heterostructure MnCo₂O₄@Co₉S₈ Nanocages as a High-Performance Bifunctional Electrode for Water Electrolysis and Flexible Supercapacitor

MOF-Derived Hollow Heterostructure MnCo₂O₄@Co₉S₈ Nanocages as a High-Performance Bifunctional Electrode for Water Electrolysis and Flexible Supercapacitor

Surface Engineering of Copper Foam to Construct a Hierarchical Heterostructure for High Energy Efficient Supercapacitors

Activating Co sites activity in Co(OH)2 via VN coupling to facilitate highly efficient oxygen evolution reaction

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Ammonia-induced construction of three-dimensional sea urchin-like Co(OH)2 @CuO structure for oxygen evolution reaction and supercapacitor

Cited by 7 publications

References 61 publications

MOF-Derived Hollow Heterostructure MnCo2O4@Co9S8 Nanocages as a High-Performance Bifunctional Electrode for Water Electrolysis and Flexible Supercapacitor

MOF-Derived Hollow Heterostructure MnCo2O4@Co9S8 Nanocages as a High-Performance Bifunctional Electrode for Water Electrolysis and Flexible Supercapacitor

Surface Engineering of Copper Foam to Construct a Hierarchical Heterostructure for High Energy Efficient Supercapacitors

Activating Co sites activity in Co(OH)2 via VN coupling to facilitate highly efficient oxygen evolution reaction

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MOF-Derived Hollow Heterostructure MnCo₂O₄@Co₉S₈ Nanocages as a High-Performance Bifunctional Electrode for Water Electrolysis and Flexible Supercapacitor

MOF-Derived Hollow Heterostructure MnCo₂O₄@Co₉S₈ Nanocages as a High-Performance Bifunctional Electrode for Water Electrolysis and Flexible Supercapacitor