Oxygen deficient interfacial effect in CeO2-modified Fe2O3/C for oxygen reduction reaction in alkaline electrolyte

Chutia, Bhugendra; Bharali, Pankaj

doi:10.1016/j.catcom.2022.106432

Cited by 5 publications

(4 citation statements)

References 24 publications

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“…Obviously, no deformation of the CV curve shape was observed as the scanning rate increased, illustrating that BSH has good electrochemical invertibility. Figure b shows the BSH GCD curves at 0.5 A g –1 , all materials showed approximately symmetric charge–discharge curves . MnCo 2 O 4 @Co 9 S 8 -10//AC BSH had a long charge–discharge time of 1435 s, which is better than MnCo 2 O 4 @Co 9 S 8 -8//AC BSH (749 s) and MnCo 2 O 4 @Co 9 S 8 -12//AC BSH (1060 s) (Figure S17), accompanied by the Coulombic efficiencies (CE) close to 100% (Figure S18).…”

Section: Resultsmentioning

confidence: 99%

“…Figure 6b shows the BSH GCD curves at 0.5 A g −1 , all materials showed approximately symmetric charge−discharge curves. 65 MnCo 2 O 4 @Co 9 S 8 -10//AC BSH had a long charge−discharge time of 1435 s, which is better than MnCo 2 O 4 @Co 9 S 8 -8//AC BSH (749 s) and MnCo 2 O 4 @Co 9 S 8 -12//AC BSH (1060 s) (Figure S17), accompanied by the Coulombic efficiencies (CE) close to 100% (Figure S18). 66 According to the GCD test results, the energy and power densities of BSH could be inferred from eqs S17 and S18, as shown in Figure 6c.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

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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: Resultsmentioning

confidence: 99%

Section: ■ Results and Discussionmentioning

confidence: 99%

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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“…Transition metal oxides (TMOs) have recently attracted enormous attention as prospective cathodic materials due to their high catalytic activity, cost-effectiveness, and environmentally benign nature. − However, these materials have several drawbacks, such as low electrical conductivity and poor electron transfer rate, which have hampered their use in real-world devices. So far, several ways have been used to address these shortcomings, which include combining TMOs with conductive carbon-based support materials.…”

Section: Introductionmentioning

confidence: 99%

Durable and Stable Bifunctional Co₃O₄-Based Nanocatalyst for Oxygen Reduction/Evolution Reactions

Chutia,

Chetry,

Rao

et al. 2024

ACS Appl. Nano Mater.

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The oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) are recognized as the core reaction processes in regenerative energy storage and conversion systems. The design of cost-effective and high-performance bifunctional ORR/OER electrocatalysts (ECs) is very important for their substantial commercialization. Herein, sponge-like Co 3 O 4 nanoparticles anchored on carbon (Sp-Co 3 O 4 /C) are successfully fabricated by a facile two-step solvothermal strategy for ORR/OER in an alkaline electrolyte. The Sp-Co 3 O 4 /C EC exhibits promising bifunctional ORR/OER activity with ORR onset potential (E onset = 0.88 V vs RHE), half-wave potential (E 1/2 = 0.75 V), limiting current density (j = −6.60 mA cm −2 ), OER onset potential (E onset = 1.26 V), and OER overpotential for 10% energy conversion (η 10 = 0.38 V) in 0.1 M KOH. It demonstrates a significantly lower reversibility index (ΔE = E j10 − E 1/2 = 0.86 V), comparable to standard Pt/C and RuO 2 ECs. The superior ORR/OER performances of Sp-Co 3 O 4 /C EC can be ascribed to the synergistic contribution of a high electrochemically active surface area (48.33 m 2 g −1 ), BET surface area (131 m 2 g −1 ), the rich interfacial structure of the crystal facets (111), (220), and (311), and the abundant oxygen vacancies in the sponge-like morphology. Besides the methanol tolerance, accelerated durability and chronoamperometric test established excellent durability and stability in the electrocatalytic operation. This work offers insight into the development of highperformance ORR/OER ECs.

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“…Over the past decades, the Pt loading has been successfully decreased to ∼0.4 mg cm –2 , and continuous efforts are being put on nonplatinum group metals (non-PGM) to extensively investigate their electrocatalytic properties . Non-noble metal oxides, as the class of nonprecious materials, are being studied extensively in recent years because of its outstanding response toward oxygen electrocatalysis. − Co-based ECs have been explored as a promising candidate for O 2 electrochemistry. Cobalt being non-noble and earth-abundant, boosted by its multistate valences (+2/+3), renders it a favorable choice in the oxides and spinel family. − OER in acidic medium is extremely difficult to achieve with materials other than IrO x or RuO x but the reaction proceeds fairly well with nonprecious metal-oxides (MOs) in alkaline media.…”

Section: Introductionmentioning

confidence: 99%

Morphology Effect of Co₃O₄ Nanooctahedron in Boosting Oxygen Reduction and Oxygen Evolution Reactions

et al. 2022

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We report a controllable synthesis of Co 3 O 4 nanooctahedron anchored on Vulcan XC 72R (Oct-Co 3 O 4 /C) to explore the crystal symmetry effects on the bifunctional electrocatalysis of oxygen reduction and oxygen evolution reaction (ORR/OER) in alkaline electrolyte. Systematic electrochemical measurements reveal that Oct-Co 3 O 4 /C exhibits remarkable ORR/OER activity with a higher ORR onset potential (E onset = 0.89 V), half-wave potential (E 1/2 = 0.68 V), large limiting current density (j = −6.38 mA cm −2 ), and significantly lower overpotential for 10% energy conversion (η 10 = 0.45 V). The superior bifunctional activity can be attributed to the synergistic contribution of high specific surface area (131.3 m 2 g −1 ), electrochemically active surface area (ECSA = 35.83 m 2 g −1 ), and rich oxygen vacancies in the well-defined octahedral crystal symmetry. Furthermore, the chronoamperometric and accelerated durability test demonstrated superior stability and durability for the catalytic process. This study underscores the significance of morphology control in the design of an advanced ORR/OER electrocatalyst in alkaline medium.

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Oxygen deficient interfacial effect in CeO2-modified Fe2O3/C for oxygen reduction reaction in alkaline electrolyte

Cited by 5 publications

References 24 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

Durable and Stable Bifunctional Co₃O₄-Based Nanocatalyst for Oxygen Reduction/Evolution Reactions

Morphology Effect of Co₃O₄ Nanooctahedron in Boosting Oxygen Reduction and Oxygen Evolution Reactions

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Oxygen deficient interfacial effect in CeO2-modified Fe2O3/C for oxygen reduction reaction in alkaline electrolyte

Cited by 5 publications

References 24 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

Durable and Stable Bifunctional Co3O4-Based Nanocatalyst for Oxygen Reduction/Evolution Reactions

Morphology Effect of Co3O4 Nanooctahedron in Boosting Oxygen Reduction and Oxygen Evolution Reactions

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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

Durable and Stable Bifunctional Co₃O₄-Based Nanocatalyst for Oxygen Reduction/Evolution Reactions

Morphology Effect of Co₃O₄ Nanooctahedron in Boosting Oxygen Reduction and Oxygen Evolution Reactions