Co3O4 Nanorods—Efficient Non-noble Metal Electrocatalyst for Oxygen Evolution at Neutral pH

Ramsundar, Rani M.; Debgupta, Joyashish; Pillai, Vijayamohanan K.; Joy, P. A.

doi:10.1007/s12678-015-0263-0

Cited by 68 publications

(45 citation statements)

References 72 publications

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“…A smaller Tafel slope suggests that the ratedetermining step is at the ending part of the multiple electron transfer reaction [39]. The obtained results show that Co 3 O 4 films on sintered metal fiber can be assessed as highly effective and stable electrode for OER, the activity being very similar to those obtained by other authors using nanocomposites [40,41] or metal-doped structures [2,12,[42][43][44][45][46].…”

Section: Electrocatalytic Activity For Oxygen Evolution Reactionsupporting

confidence: 77%

Electrocatalytic and pseudocapacitive properties of cobalt (hydro)oxide films on sintered metal fiber filter

Barauskienė

Valatka

2017

Mater Renew Sustain Energy

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Cobalt (hydro)oxide films on Bekipor ST 20AL3 sintered metal fiber were formed by electrochemical deposition under galvanostatic conditions using different electrolyte baths (nitrate, acetate and chloride). Cobalt oxide films were prepared via thermal treatment of as-deposited specimens at 673 K. Electroactive surface area of as-deposited and annealed films was estimated using oxidation-reduction system containing ferricyanide/ferrocyanide. Electrocatalytic and pseudocapacitive properties of the prepared films were investigated using 0.1 M NaOH aqueous solutions. The maximum specific capacitance of 1324 F g -1 was observed for a-Co(OH) 2 films electrodeposited from nitrate-containing electrolyte. Similarly, the highest electrocatalytic activity and stability in oxygen evolution reaction (OER) was determined to be characteristic for Co 3 O 4 films derived from nitrate bath.

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Section: Electrocatalytic Activity For Oxygen Evolution Reactionsupporting

confidence: 77%

Electrocatalytic and pseudocapacitive properties of cobalt (hydro)oxide films on sintered metal fiber filter

Barauskienė

Valatka

2017

Mater Renew Sustain Energy

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“…[25] Co 3 O 4 has also been described as aC o-OEC. [26] Ar ecent trend is to support Co-OECs on diverse supports(e.g.,s ilica, zeolite, graphene, etc.) and to utilize them as WOCs.…”

Section: Introductionmentioning

confidence: 99%

Electrochemical Water Oxidation Catalyzed by an In Situ Generated α‐Co(OH)₂ Film on Zeolite‐Y Surface

Bose

Debgupta

Ramsundar

et al. 2017

Chemistry A European J

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The design and synthesis of an efficient and robust water-oxidation catalyst with inexpensive materials remains an important challenge in the context of artificial photosynthesis. Herein, as imple but unique technique is reported to in situ generate at hin-film of a-Co(OH) 2 on the surface of zeolite-Y [hereafter referred to as Y-a-Co(OH) 2 ] that acts as an efficient and stable catalyst for electrochemical water oxidation in alkaline medium. Catalyst Y-a-Co(OH) 2 is so stable that it retains its catalytic activity even after 2000 cyclic voltammetric cycles of water oxidation. Expectedly,t he chemical compositiono fa-Co(OH) 2 on the surface of zeolite-Y remainss ame as that of parentY -a-Co(OH) 2 after 2000 electrocatalytic cycles. AT afel slope as low as 59 mV decade À1 in 0.1 m KOH (pH 13) suggestsf aster oxygen evolution kinetics (overpotential = 329 mV;t urnover frequency = 0.35 mol O 2 (mol Co)À1 s À1 at 1mAcm À2 )t han the existing aCo(OH) 2 -based electrocatalysts operating in alkaline medium.

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“…[39,40] The rough estimation of turnover frequency (TOF) for each active site, which reflects the intrinsic activity of catalysts, makes it possible to compare the activity of p-NiFe-LDH@NiFe-B i /CC with that of p-NiFe-LDH/CC. [41] The surface concentration of actives ites was extracted from the linear relationship between the oxidation peak current and scan rates from CVs (Figure S7). Figure4dd isplays the relationship between calculated TOFs and overpotentials for p-NiFe-LDH@NiFe-B i /CC and p-NiFe-LDH/CC.…”

mentioning

confidence: 99%

Facilitating Active Species Generation by Amorphous NiFe‐B_i Layer Formation on NiFe‐LDH Nanoarray for Efficient Electrocatalytic Oxygen Evolution at Alkaline pH

Zhang

et al. 2017

Chemistry A European J

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Searching for a simple and fast strategy to effectively enhance the oxygen evolution reaction (OER) performance of non-noble-metal electrocatalysts in alkaline media remains a significant challenge. Herein, the OER activity of NiFe-LDH nanoarray on carbon cloth (NiFe-LDH/CC) in alkaline media is shown to be greatly boosted by an amorphous NiFe-Borate (NiFe-B ) layer formation on NiFe-layered double hydroxide (NiFe-LDH) surface. Such a NiFe-LDH@NiFe-B /CC catalyst electrode only needs an overpotential of 294 mV to drive 50 mA cm in 1.0 m KOH; 116 mV less than that needed by NiFe-LDH/CC. Notably, this electrode also demonstrates strong long-term electrochemical durability. The superior activity is ascribed to the pre-formed amorphous NiFe-B layer effectively promoting active species generation on the NiFe-LDH surface. This work opens up exciting new avenues for developing high-performance water-oxidation catalyst materials for application.

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Co3O4 Nanorods—Efficient Non-noble Metal Electrocatalyst for Oxygen Evolution at Neutral pH

Cited by 68 publications

References 72 publications

Electrocatalytic and pseudocapacitive properties of cobalt (hydro)oxide films on sintered metal fiber filter

Electrocatalytic and pseudocapacitive properties of cobalt (hydro)oxide films on sintered metal fiber filter

Electrochemical Water Oxidation Catalyzed by an In Situ Generated α‐Co(OH)₂ Film on Zeolite‐Y Surface

Facilitating Active Species Generation by Amorphous NiFe‐B_i Layer Formation on NiFe‐LDH Nanoarray for Efficient Electrocatalytic Oxygen Evolution at Alkaline pH

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Co3O4 Nanorods—Efficient Non-noble Metal Electrocatalyst for Oxygen Evolution at Neutral pH

Cited by 68 publications

References 72 publications

Electrocatalytic and pseudocapacitive properties of cobalt (hydro)oxide films on sintered metal fiber filter

Electrocatalytic and pseudocapacitive properties of cobalt (hydro)oxide films on sintered metal fiber filter

Electrochemical Water Oxidation Catalyzed by an In Situ Generated α‐Co(OH)2 Film on Zeolite‐Y Surface

Facilitating Active Species Generation by Amorphous NiFe‐Bi Layer Formation on NiFe‐LDH Nanoarray for Efficient Electrocatalytic Oxygen Evolution at Alkaline pH

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Electrochemical Water Oxidation Catalyzed by an In Situ Generated α‐Co(OH)₂ Film on Zeolite‐Y Surface

Facilitating Active Species Generation by Amorphous NiFe‐B_i Layer Formation on NiFe‐LDH Nanoarray for Efficient Electrocatalytic Oxygen Evolution at Alkaline pH