Abstract:A facile hydrothermal strategy was first proposed to synthesize flower-like Co(OH) 2 hierarchical microspheres. Further physical characterizations revealed that the flower-like Co(OH) 2 microspherical superstructures were self-assembled by one-dimension nanobelts with rich mesopores. Electrochemical performance of the flower-like Co(OH) 2 hierarchical superstructures were investigated by cyclic voltammgoram, galvanostatic charge-discharge and electrochemical impedance spectroscopy in 3 M KOH aqueous electrolyt… Show more
“…3(f). The high-frequency intersection of the plots at the real axis represents the internal solution resistance including the electrolyte resistance, the collector/electrode contact resistance, and the electrode/electrolyte interface resistance [2]. b-Co(OH) 2 /NF is smaller than that of b-Co(OH) 2 .…”
Section: Resultsmentioning
confidence: 99%
“…Cobalt hydroxide has been attracting much attention for energy storage applications due to its high theoretical specific capacitance [1][2][3][4]. For example, Gong et al [5] prepared Co(OH) 2 sheets via a ball-milling method, whose average specific capacitance was 599 F/g at a scan rate of 2 mV/s.…”
“…3(f). The high-frequency intersection of the plots at the real axis represents the internal solution resistance including the electrolyte resistance, the collector/electrode contact resistance, and the electrode/electrolyte interface resistance [2]. b-Co(OH) 2 /NF is smaller than that of b-Co(OH) 2 .…”
Section: Resultsmentioning
confidence: 99%
“…Cobalt hydroxide has been attracting much attention for energy storage applications due to its high theoretical specific capacitance [1][2][3][4]. For example, Gong et al [5] prepared Co(OH) 2 sheets via a ball-milling method, whose average specific capacitance was 599 F/g at a scan rate of 2 mV/s.…”
“…[194][195][196] Zhang and co-workers developed biomolecule-assisted hydrothermal processes to synthesize different Co(OH) 2 mesocrystals and nano-superstructures. [194][195][196] When lysine was used, three-dimensional urchin-like b-Co(OH) 2 microspheres were obtained. 193 The oriented nanowires in a radial form created abundant V-shape porous channels.…”
“…Flowerlike b-Co(OH) 2 hierarchical superstructures self-assembled from mesoporous ($3 nm) nanobelts were synthesized when Co(SO 4 ) 2 $6H 2 O was used as the cobalt precursor. 196 When L-arginine was used as a hydrolysis-controlling agent, 195 a-Co(OH) 2 triangular nanosheets with a thickness of $10 nm (Fig. 4) were synthesized.…”
“…The specic capacitance of the binder and additive-free a-Co(OH) 2 electrode was $643 F g À1 . 196 4.2.2 Electrochemical deposition. [199][200][201][202][203][204][205][206][207][208][209][210] Gupta et al 199 fabricated a-Co(OH) 2 nanosheets on stainless steel by cathodic potentiostatic deposition.…”
Recent progress, achievements, challenges and outlook in the (re)search of high performance cobalt-based compounds and composites for electrochemical capacitors.
Electrodeposition is an effective method to prepare various materials. We have established a bipolar electrodeposition system assisted by a constant magnetic field to fabricate a Co/ Fe/Ni phytate catalyst with good electrocatalytic activity for overall water splitting. The effects of magnetic and electric fields on the catalytic properties of the material were studied. The catalyst prepared with an N-pole magnetic field (NPMF) exhibited good overall water splitting performance. Benefiting from the synergistic effect of the Co/Fe/Ni-phytate and the advantages of the N-pole magnetic field the NPMF electrode has a continuous 25 hours high-efficiency hydrogen evolution and oxygen evolution reaction at a current density of 100 mA cm À 2 in1.0 M KOH compared with commercial RuO 2 and Pt/C. Bipolar electrodeposition with a constant magnetic field is thus an efficient means to fabricate electrocatalytic water splitting catalysts.
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