High-performance cobalt carbonate hydroxide nano-dot/NiCo(CO 3 )(OH) 2 electrode for asymmetric supercapacitors

Lee, Damin; Xia, Qixun; Yun, Je Moon; Kim, Kwang Ho

doi:10.1016/j.apsusc.2017.10.066

Cited by 107 publications

(50 citation statements)

References 67 publications

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“…These binding energies correspond to Co 2+ of CoO and are well matched with the literature report [47]. Another doublet with binding energies 782.7 eV and 797.6 eV for Co 2p 3/2 and Co 2p 1/2 peak that may be possibly due to the formation of Co(OH) 2 on the surface [48]. In addition, two satellite peaks are found at approximately 788.2 eV and 7984 eV, respectively.…”

Section: Resultssupporting

confidence: 88%

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Galvanic Exchange as a Novel Method for Carbon Nitride Supported CoAg Catalyst Synthesis for Oxygen Reduction and Carbon Dioxide Conversion

et al. 2019

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A bimetallic alloy of CoAg nanoparticles (NPs) on a carbon nitride (CN) surface was synthesized using a galvanic exchange process for the oxygen reduction reaction (ORR) and carbon dioxide electrocatalytic conversion. The reduction potential of cobalt is ([Co2+(aq) + 2e− → Co(s)], −0.28 eV) is smaller than that of Ag ([Ag+(aq) + e− → Ag(s)], 0.80 eV), which makes Co(0) to be easily replaceable by Ag+ ions. Initially, Co NPs (nanoparticles) were synthesized on a CN surface via adsorbing the Co2+ precursor on the surface of CN and subsequently reducing them with NaBH4 to obtain Co/CN NP. The Co NPs on the surface of CN were then subjected to galvanic exchange, where the sacrificial Co atoms were replaced by Ag atoms. As the process takes place on a solid surface, only the partial replacement of Co by Ag was possible generating CoAg/CN NPs. Synthesized CoAg/CN bimetallic alloy were characterized using different techniques such as powder x-ray diffraction (PXRD), x-ray photoelectron spectroscopy (XPS), transmission electron microscopy (TEM), scanning electron microscopy (SEM), and electron diffraction spectroscopy (EDS) to confirm the product. Both the catalysts, Co/CN and CoAg/CN, were evaluated for oxygen reduction reaction in 1M KOH solution and carbon dioxide conversion in 0.5 M KHCO3. In the case of ORR, the CoAg/CN was found to be an efficient electrocatalyst with the onset potential of 0.93 V, which is comparable to commercially available Pt/C having Eonset at 0.91 V. In the electrocatalytic conversion of CO2, the CoAg/CN showed better performance than Co/CN. The cathodic current decreased dramatically below −0.9V versus Ag/AgCl indicating the high conversion of CO2.

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Section: Resultssupporting

confidence: 88%

“…These two signals correspond to a shift in 3d 5/2 and 3d 3/2 orbitals, which infers a possible bond between the silver and oxygen atoms [49]. Co(OH)2 on the surface [48]. In addition, two satellite peaks are found at approximately 788.2 eV and 7984 eV, respectively.…”

Section: Resultsmentioning

confidence: 85%

Galvanic Exchange as a Novel Method for Carbon Nitride Supported CoAg Catalyst Synthesis for Oxygen Reduction and Carbon Dioxide Conversion

et al. 2019

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“…6. The Co 2p spectrum could be fitted into two spin-orbit doublets, which are characteristic of Co 2+ and Co 3+ , and two shake-up satellites 22 . Only in the case of catalyst (1), a small quantity of metallic cobalt was observed represented by the additional peak of Co 0 in the cobalt 2P3/2 spin orbit.…”

Section: -Materials Characterizationsmentioning

confidence: 99%

Cobalt Graphitic Carbon Nanoparticles for Catalytic Hydrogenation of 2,4-Dinitrophenol

Hammud

Alkhalifah

Traboulsi

et al. 2021

Preprint

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Cobalt carbon nanoparticles CoCNPs were prepared by pyrolysis of cobalt phenanthroline complex at different pyrolysis temperature and time of pyrolysis and used for the catalytic hydrogenation of 2,4-dinitrophenol. CoCNPs (1) and (3) were prepared by heating at 600 ºC and 800 °C respectively, while (2) was prepared by heating at 600 °C with an additional intermediate stage at 300 °C. The structures and chemical properties of the three catalysts were correlated with their catalytic activities. Among the three studied catalysts, the highest rate constant was obtained for (2) while the highest conversion was achieved by (3). Our data show that an increase in oxygen content of the cobalt carbon nano-catalyst reduces the catalytic activity, while an increase in pyrolysis temperature improves the conversion yield.

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“…Mahmood et al developed mesoporous chlorine‐doped carbonated cobalt hydroxide nanowires with improved specific capacitance, rate capability, and stability 21 . Moreover, Lee et al developed NiCo(CO 3 )(OH) 2 nanowire hybrid structures for applications into SC electrode 22 …”

Section: Introductionmentioning

confidence: 99%

“…For instance, NiCo‐hydroxide hybridized with NiCo‐carbonate hydroxide presented a maximum specific capacitance of 632 F g −1 at 5 mV s −1 26 . Moreover, the Co‐carbonate hydroxide nano‐dot hosted by NiCo‐carbonate hydroxide was designed as a potential electrode material of SC, showing specific capacity of 1288 mA h g −1 at 3 A g −1 22 . However, the current synthesis route is very complicated to simultaneously obtain such target chemistry and desired morphology.…”

Section: Introductionmentioning

confidence: 99%

Interconnected network‐like single crystalline bimetallic carbonate hydroxide nanowires for high performance hybrid supercapacitors

et al. 2020

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Summary The one‐dimensional (1D) nanoarchitectures are attractive toward energy storage electrode materials because of their large available surface area, a short and efficient pathway for ion/electron transport, structural stability, and highly exposed electrochemically active sites. Herein, we develop the bimetallic single crystalline nickel cobalt carbonate hydroxide (NiCoCO3(OH)2) nanowires for the high capacitance electrode of hybrid supercapacitor (HSC). This unique NiCoCO3(OH)2 nanowire electrode reveals a maximum specific capacitance value of 1948 F g−1 at 1 A g−1 with a high rate capacitance of 859 F g−1 even at 30 A g−1, which is a considerably higher value than the monometallic nickel carbonate hydroxide (1159 F g−1) and cobalt carbonate hydroxide (859 F g−1), respectively. These results are attributed to the presence of abundant redox‐active sites of multivalent Ni and Co and an easy charge transport pathway of NiCoCO3(OH)2 nanowire. The as‐designed HSC full cells, configuring NiCoCO3(OH)2 nanowire and activated carbon as a positive and native electrodes, respectively, deliver energy and power densities of 56.56 W h kg−1 and 44.81 kW kg−1. Moreover, the HSC cells exhibit prominent cycling stability of 91.4% for 12 000 charge‐discharge cycles in 6 M KOH aqueous electrolyte.

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High-performance cobalt carbonate hydroxide nano-dot/NiCo(CO 3 )(OH) 2 electrode for asymmetric supercapacitors

Cited by 107 publications

References 67 publications

Galvanic Exchange as a Novel Method for Carbon Nitride Supported CoAg Catalyst Synthesis for Oxygen Reduction and Carbon Dioxide Conversion

Galvanic Exchange as a Novel Method for Carbon Nitride Supported CoAg Catalyst Synthesis for Oxygen Reduction and Carbon Dioxide Conversion

Cobalt Graphitic Carbon Nanoparticles for Catalytic Hydrogenation of 2,4-Dinitrophenol

Interconnected network‐like single crystalline bimetallic carbonate hydroxide nanowires for high performance hybrid supercapacitors

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