Electrocatalytic performance of CuO/graphene nanocomposites for Li–O 2 batteries

Kim, Da Sol; Lee, Gwang Hee; Kim, Jae Chan; Lee, Hack Jun; Kim, Byung Kook; Kim, Dong Wan

doi:10.1016/j.jallcom.2016.11.317

Cited by 15 publications

(6 citation statements)

References 30 publications

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“…CuO is a p-type semiconductor with a bandgap of ~1.2 eV in its bulk form [26]. CuO has been successfully used in solar cells [27,28], sensors [29,30], batteries [31,32], biosensing [33], water remediation [33,34], CO 2 conversion [7], and heterogeneous catalysis for degradation of several dyes [35][36][37]. Owing to its narrow bandgap, CuO can be considered as a proper alternative to other wide bandgap semiconducting nanomaterials.…”

Section: Introductionmentioning

confidence: 99%

RETRACTED: Synthesis, Characterization and Photodegradation Studies of Copper Oxide–Graphene Nanocomposites

et al. 2021

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In this work, a simple hydrothermal method was employed to prepare a pristine sample of copper oxide (CuO) and three samples of copper oxide–graphene nanocomposites (CuO-xG) with x = 2.5, 5, and 10 mg of graphene. The synthesized samples were characterized using X-ray powder diffractometry (XRD), field emission scanning electron microscopy (FESEM), energy-dispersive X-ray spectroscopy (EDX), Fourier-transform infrared spectroscopy (FTIR) and ultraviolet–visible (UV-Vis) spectroscopy. The XRD patterns of CuO-xG nanocomposites exhibited the diffraction peaks related to the crystal planes of monoclinic CuO and hexagonal graphite. The surface morphology of the prepared samples was investigated using FESEM images. EDX analysis was used to investigate the chemical composition of the synthesized samples. FTIR spectroscopy identified the vibrational modes of the covalent bonds present in the samples. The allowed direct optical bandgap energy was calculated for all prepared samples using UV-Vis absorption spectra. The small bandgap of CuO-xG nanocomposites indicates their potential use as an effective photocatalyst in the presence of visible light. Photocatalytic activity of the samples was explored for the degradation of methylene blue (MB) dye contaminant under visible light irradiation. The results showed that the CuO-5G sample has the highest photodegradation efficiency (~56%).

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Section: Introductionmentioning

confidence: 99%

RETRACTED: Synthesis, Characterization and Photodegradation Studies of Copper Oxide–Graphene Nanocomposites

et al. 2021

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“…Hence, the replacement of precious metal-based ECs by alternative low-cost, highly proficient, stable, and non-Pt ECs has become a challenging task mainly for electrochemists. Over the past few decades, there has been extensive focus on metal oxides (MOs) based on transition metals − and post - transition metals. , Among various transition MOs, copper oxides attract considerable attention in various electrochemical reactions due to variable oxidation states, natural abundance, chemical stability, and nonpolluting nature . However, their activity is somewhat limited in practical use due to poor electronic conduction.…”

Section: Introductionmentioning

confidence: 99%

Elucidating the Role of Oxide–Oxide/Carbon Interfaces of CuO_x–CeO₂/C in Boosting Electrocatalytic Performance

et al. 2020

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Herein, we report the synthesis and bifunctional oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) activities of a CuO x −CeO 2 /C electrocatalyst (EC) with rich oxide−oxide and oxide−carbon interfaces. It not only demonstrates a smaller Tafel slope (65 mV dec −1 ) and higher limiting current density (−5.03 mA cm −2 ) but also exhibits an onset potential (−0.10 V vs Ag/AgCl) comparable to that of benchmark Pt/C. Besides undergoing the favorable direct four-electron ORR pathway, it unveils a loss of 23% of its initial current after 6 h of a stability test and a negative shift of 4 mV in the half-wave potential after the accelerated durability test compared to the corresponding current loss of 28% and negative shift of 20 mV for Pt/C. It also reveals remarkable OER activity in an alkaline medium with a low onset potential (0.20 V) and a smaller Tafel slope (177 mV dec −1 ). The bifunctional ORR/OER activity of CuO x −CeO 2 /C EC can be ascribed to the synergistic effects, its unique structure with enriched oxygen vacancies owing to the presence of Ce 4+ /Ce 3+ , robust oxide−oxide and oxide−carbon heterointerfaces, and homogeneous dispersion of oxides over the carbon bed, which facilitates faster electronic conduction.

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“…Copper metal oxide in the shape of nanoleaves and nanowires was also explored by anchoring CuOH into graphene sheets with final reduction to CuO at low temperature [59] . The presence of the catalyst allowed the reduction of the overpotential from 1.58 to 1.39 V and was stable over 120 cycles (1000 mAh g −1 at 1000 mA g −1 ).…”

Section: Lithium–oxygen Batteriesmentioning

confidence: 99%

An Overview of Engineered Graphene‐Based Cathodes: Boosting Oxygen Reduction and Evolution Reactions in Lithium– and Sodium–Oxygen Batteries

et al. 2020

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The depletion of fossil fuels, the rapid evolution of the global economy, and high living standards require the development of new energy‐storage systems that can meet the needs of the world's population. Metal–oxygen batteries (M=Li, Na) arise, therefore, as promising alternatives to widely used lithium‐ion batteries, due to their high theoretical energy density, which approaches that of gasoline. Although significant progress has been made in recent years, there are still several challenges to overcome to reach the final commercialization of this technology. One of the most limiting and challenging factors is the development of bifunctional cathodes towards oxygen reduction and evolution reactions. In this sense, graphene, which is very promising and tunable, has been widely explored by the research community as a key material for this technology. Herein, a wide literature overview is presented and analyzed with the aim of guiding future research in this field.

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Electrocatalytic performance of CuO/graphene nanocomposites for Li–O 2 batteries

Cited by 15 publications

References 30 publications

RETRACTED: Synthesis, Characterization and Photodegradation Studies of Copper Oxide–Graphene Nanocomposites

RETRACTED: Synthesis, Characterization and Photodegradation Studies of Copper Oxide–Graphene Nanocomposites

Elucidating the Role of Oxide–Oxide/Carbon Interfaces of CuO_x–CeO₂/C in Boosting Electrocatalytic Performance

An Overview of Engineered Graphene‐Based Cathodes: Boosting Oxygen Reduction and Evolution Reactions in Lithium– and Sodium–Oxygen Batteries

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Electrocatalytic performance of CuO/graphene nanocomposites for Li–O 2 batteries

Cited by 15 publications

References 30 publications

RETRACTED: Synthesis, Characterization and Photodegradation Studies of Copper Oxide–Graphene Nanocomposites

RETRACTED: Synthesis, Characterization and Photodegradation Studies of Copper Oxide–Graphene Nanocomposites

Elucidating the Role of Oxide–Oxide/Carbon Interfaces of CuOx–CeO2/C in Boosting Electrocatalytic Performance

An Overview of Engineered Graphene‐Based Cathodes: Boosting Oxygen Reduction and Evolution Reactions in Lithium– and Sodium–Oxygen Batteries

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Elucidating the Role of Oxide–Oxide/Carbon Interfaces of CuO_x–CeO₂/C in Boosting Electrocatalytic Performance