Uniform and porous Mn-doped Co3O4 microspheres: Solvothermal synthesis and their superior supercapacitor performances

Chen, Huiyu; Wang, Jinpeng; Liao, Fan; Han, Xingrong; Zhang, Yanfei; Xu, Chunju; Gao, Li

doi:10.1016/j.ceramint.2019.03.070

Cited by 67 publications

(19 citation statements)

References 56 publications

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“…Alternatively, Co 3 O 4 spheres were prepared using a slightly different recipe (Figure f), and Mn was added during the synthesis of the spheres. Bulk Co 3 O 4 particles with a spherical shape have been reported to possess a preferential (111) surface. , The spherical shape was preserved after 1 mol % of Mn doping (Figure g). HR-TEM images in Figure h show that (220) planes with a lattice spacing of 0.286 nm have an interfacial angle of about ∼60°, indicating a (111) surface of the sphere. , The ICP results showed that 1 mol % Mn-doped Co 3 O 4 cubes and spheres had nearly identical Mn contents of 1.09 and 1.10 mol %, respectively.…”

Section: Resultsmentioning

confidence: 93%

Facet-Dependent Mn Doping on Shaped Co₃O₄ Crystals for Catalytic Oxidation

et al. 2021

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Doping other metals is known as a facile strategy to improve the catalytic activity of metal oxide catalysts. However, the doping behavior heavily depends on the surface structure of the host metal oxide, possibly leading to different catalytic properties. Here, Mn was doped onto Co 3 O 4 cubes or octahedra with different facets of ( 100) and ( 111), respectively. Mn could be successfully doped into (100) facets, whereas it was excessively accumulated on (111) facets, not incorporating into the lattice. For the simultaneous oxidation of CO, C 3 H 6 , and C 3 H 8 with water vapor, Mn-doped Co 3 O 4 cubes showed superior activity because the Mn doping could improve the amount of surface-adsorbed oxygen and the transfer of surface oxygen species. The elaborated Mn doping on Co 3 O 4 cubes could minimize the metal oxide sintering, inducing superior durability. This non-preciousmetal oxide catalyst can provide an efficient solution for low-cost automobile exhaust treatment.

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Section: Resultsmentioning

confidence: 93%

Facet-Dependent Mn Doping on Shaped Co₃O₄ Crystals for Catalytic Oxidation

et al. 2021

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“…In addition to this, metal doping into Co 3 O 4 can also increase the conductivity of a nanomaterial, which is highly beneficial for enhanced performance of a supercapacitor [18,19]. Dopants such as Cu, Mn, Fe, and Ni have been explored [20][21][22][23][24] to test the electrochemical performance of Co 3 O 4 . Further, engineering strategies have been studied at the atomic level to improve the catalytic performance of Co 3 O 4 by providing new physiochemical features and developing synergetic effects to enhance the OER kinetics [25,26].…”

Section: Introductionmentioning

confidence: 99%

Electrochemical Performance of Iron-Doped Cobalt Oxide Hierarchical Nanostructure

et al. 2021

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In this study, hydrothermally produced Fe-doped Co3O4 nanostructured particles are investigated as electrocatalysts for the water-splitting process and electrode materials for supercapacitor devices. The results of the experiments demonstrated that the surface area, specific capacitance, and electrochemical performance of Co3O4 are all influenced by Fe3+ content. The FexCo3-xO4 with x = 1 sample exhibits a higher BET surface (87.45 m2/g) than that of the pristine Co3O4 (59.4 m2/g). Electrochemical measurements of the electrode carried out in 3 M KOH reveal a high specific capacitance of 153 F/g at a current density of 1 A/g for x = 0.6 and 684 F/g at a 2 mV/s scan rate for x = 1.0 samples. In terms of electrocatalytic performance, the electrode (x = 1.0) displayed a low overpotential of 266 mV (at a current density of 10 mA/cm2) along with 52 mV/dec Tafel slopes in the oxygen evolution reaction. Additionally, the overpotential of 132 mV (at a current density of 10 mA/cm2) and 109 mV with 52 mV/dec Tafel slope were obtained for x = 0.6 sample towards hydrogen evolution reaction (HER). According to electrochemical impedance spectroscopy (EIS) measurements and the density functional theory (DFT) study, the addition of Fe3+ increased the conductivity at the electrode–electrolyte interface, which substantially impacted the high activity of the iron-doped cobalt oxide. The electrochemical results revealed that the mesoporous Fe-doped Co3O4 nanostructure could be used as potential electrode material in the high-performance electrochemical capacitor and water-splitting catalysts.

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“…The successful formation of the microsphere morphology is due to the self-assembly function of the EG/EN multifunctional template. The solvothermal treatment can create a spherical scaffold geometry with a controlled, porous architecture by adjusting the solvent molecules [47,48].…”

Section: Resultsmentioning

confidence: 99%

“…The researches show that the solvothermal process played an important role to control the morphology and composition of electrode materials by changing the concentration of catalyst and solvent [47,48]. Herein, N-doped hard/soft double-carbon-coated Na 3 V 2 (PO 4 ) 3 hybrid-porous microspheres (N-HSDC/NVP-HMs) were prepared by a solvothermal-assisted carbothermal reduction method.…”

Section: Introductionmentioning

confidence: 99%

N-doped hard/soft double-carbon-coated Na3V2(PO4)3 hybrid-porous microspheres with pseudocapacitive behaviour for ultrahigh power sodium-ion batteries

Sun

Zhang

et al. 2020

Electrochimica Acta

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Uniform and porous Mn-doped Co3O4 microspheres: Solvothermal synthesis and their superior supercapacitor performances

Cited by 67 publications

References 56 publications

Facet-Dependent Mn Doping on Shaped Co₃O₄ Crystals for Catalytic Oxidation

Facet-Dependent Mn Doping on Shaped Co₃O₄ Crystals for Catalytic Oxidation

Electrochemical Performance of Iron-Doped Cobalt Oxide Hierarchical Nanostructure

N-doped hard/soft double-carbon-coated Na3V2(PO4)3 hybrid-porous microspheres with pseudocapacitive behaviour for ultrahigh power sodium-ion batteries

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Uniform and porous Mn-doped Co3O4 microspheres: Solvothermal synthesis and their superior supercapacitor performances

Cited by 67 publications

References 56 publications

Facet-Dependent Mn Doping on Shaped Co3O4 Crystals for Catalytic Oxidation

Facet-Dependent Mn Doping on Shaped Co3O4 Crystals for Catalytic Oxidation

Electrochemical Performance of Iron-Doped Cobalt Oxide Hierarchical Nanostructure

N-doped hard/soft double-carbon-coated Na3V2(PO4)3 hybrid-porous microspheres with pseudocapacitive behaviour for ultrahigh power sodium-ion batteries

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Facet-Dependent Mn Doping on Shaped Co₃O₄ Crystals for Catalytic Oxidation

Facet-Dependent Mn Doping on Shaped Co₃O₄ Crystals for Catalytic Oxidation