Multilayer hybrid nanosheet of mesoporous carbon−layered metal oxide as a highly efficient electrocatalyst for Li−O2 batteries

Jo, Young‐Heon; Tamakloe, Wilson; X, Jin; Lim, Joohyun; Patil, S. B.; Kang, Yong‐Mook; Hwang, Seong Ju

doi:10.1016/j.apcatb.2019.05.025

Cited by 29 publications

(13 citation statements)

References 48 publications

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“…Thus, we conclude the well-distributed Co-N 4 configurations play a decisive role in alleviating charge/discharge polarization, especially overpotential, leading to greatly improved round-trip efficiency, coulombic efficiency and cycling performance. As seen in Supplementary Table 3, the outstanding electrochemical performance of Co-SAs/N-C places it in advance of some published functional carbonaceous and noble metal catalysts 12,13,[53][54][55][56][57][58][59][60][61][62] .…”

Section: Resultsmentioning

confidence: 96%

Atomically dispersed cobalt catalyst anchored on nitrogen-doped carbon nanosheets for lithium-oxygen batteries

et al. 2020

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Developing single-site catalysts featuring maximum atom utilization efficiency is urgently desired to improve oxidation-reduction efficiency and cycling capability of lithium-oxygen batteries. Here, we report a green method to synthesize isolated cobalt atoms embedded ultrathin nitrogen-rich carbon as a dual-catalyst for lithium-oxygen batteries. The achieved electrode with maximized exposed atomic active sites is beneficial for tailoring formation/decomposition mechanisms of uniformly distributed nano-sized lithium peroxide during oxygen reduction/evolution reactions due to abundant cobalt-nitrogen coordinate catalytic sites, thus demonstrating greatly enhanced redox kinetics and efficiently ameliorated over-potentials. Critically, theoretical simulations disclose that rich cobalt-nitrogen moieties as the driving force centers can drastically enhance the intrinsic affinity of intermediate species and thus fundamentally tune the evolution mechanism of the size and distribution of final lithium peroxide. In the lithium-oxygen battery, the electrode affords remarkably decreased charge/discharge polarization (0.40 V) and long-term cyclability (260 cycles at 400 mA g−1).

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Section: Resultsmentioning

confidence: 96%

Atomically dispersed cobalt catalyst anchored on nitrogen-doped carbon nanosheets for lithium-oxygen batteries

et al. 2020

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“… − These results signify escalated capacitive-dominant reactions upon GO hybridization. The observed capacitive-dominant reactions for CCG nanohybrids are attributable to the faster charge transfer kinetics via accessible redox-active sites because of the random stacking structure of component NSs and high conductivity because of the hybridization with GO NS matrix …”

Section: Resultsmentioning

confidence: 79%

Graphene Oxide as an Efficient Hybridization Matrix for Exploring Electrochemical Activity of Two-Dimensional Cobalt-Chromium-Layered Double Hydroxide-Based Nanohybrids

Sadavar

Padalkar

Patil

et al. 2022

ACS Appl. Energy Mater.

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Two-dimensional graphene oxide (GO) nanosheets with high electrical conductivity and electrochemical stability are employed as a hybridization matrix to improve the electrode performance of layered double hydroxides (LDHs). A cobaltchromium-LDH hybridized with a GO matrix leads to anchored Co-Cr-LDH-GO (CCG) self-assembly with a high surface area, mesoporous morphology, high electrical conductivity, and high charge transfer kinetics. The CCG nanohybrids display enhanced specific capacity (1502 C g −1 ) with high-rate characteristics compared to pristine Co-Cr-LDH (591 C g −1 ), signifying the crucial role of GO as a hybridization matrix for improving the electrode performance of LDH materials. Aqueous and all-solid-state hybrid supercapacitors are fabricated using the best-optimized CCG nanohybrid and reduced graphene oxide as an anode and a cathode, respectively. The aqueous device delivers a specific capacitance of 181 F g −1 , a specific energy (SE) of 56.66 Wh kg −1 , and a specific power (SP) of 600 W kg −1 at 0.8 A g −1 . Moreover, the solid-state device delivers a specific capacitance of 130.8 F g −1 , a SE of 46.50 Wh kg −1 , and a SP of 1536 W kg −1 at 1.92 A g −1 . The present study clearly demonstrates the usefulness of conducting GO as an efficient hybridization matrix to improve the electrode performance of LDHs.

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“…Jo et al fabricated 2D multilayer hybrid nanosheets of mesoporous carbon (MC)-MnO 2 nanosheets (denoted as MCM) via facile alkaline etching of silica template, in which open-channels in MC were aligned perpendicularly to the surface of layered metal oxide nanosheets with well-defined interfaces. [132] The arrangement of alternating MnO 2 layer and MC layer was made possible due to the minimized hydrophilic interaction between MnO 2 nanosheets and π-π* interaction between carbon layers that prevented the stacking of individual 2D structure components. The excellent electrocatalyst/electrode performances of 2D multilayer MCM hybrid were correlated to the optimized interfacial charge transfer, pore structure, and rapid kinetics.…”

Section: Modification Of Carbon For Better C-tmo Interaction and Tmo mentioning

confidence: 99%

Carbon Transition‐metal Oxide Electrodes: Understanding the Role of Surface Engineering for High Energy Density Supercapacitors

Tomboc

Gadisa

Jun

et al. 2020

Chemistry An Asian Journal

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Supercapacitors store electrical energy by ion adsorption at the interface of the electrode-electrolyte (electric double layer capacitance, EDLC) or through faradaic process involving direct transfer of electrons via oxidation/ reduction reactions at one electrode to the other (pseudocapacitance). The present minireview describes the recent developments and progress of carbon-transition metal oxides (C-TMO) hybrid materials that show great promise as an efficient electrode towards supercapacitors among various material types. The review describes the synthetic methods and electrode preparation techniques along with the changes in the physical and chemical properties of each component in the hybrid materials. The critical factors in deriving both EDLC and pseudocapacitance storage mechanisms are also identified in the hope of pointing to the successful hybrid design principles. For example, a robust carbon-metal oxide interaction was identified as most important in facilitating the charge transfer process and activating high energy storage mechanism, and thus methodologies to establish a strong carbon-metal oxide contact are discussed. Finally, this article concludes with suggestions for the future development of the fabrication of high-performance C-TMO hybrid supercapacitor electrodes.[a] Dr.

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Multilayer hybrid nanosheet of mesoporous carbon−layered metal oxide as a highly efficient electrocatalyst for Li−O2 batteries

Cited by 29 publications

References 48 publications

Atomically dispersed cobalt catalyst anchored on nitrogen-doped carbon nanosheets for lithium-oxygen batteries

Atomically dispersed cobalt catalyst anchored on nitrogen-doped carbon nanosheets for lithium-oxygen batteries

Graphene Oxide as an Efficient Hybridization Matrix for Exploring Electrochemical Activity of Two-Dimensional Cobalt-Chromium-Layered Double Hydroxide-Based Nanohybrids

Carbon Transition‐metal Oxide Electrodes: Understanding the Role of Surface Engineering for High Energy Density Supercapacitors

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