Cited 12 time in webofscience Cited 13 time in scopus

Porous LaCo1-xNixO3-delta Nanostructures as an Efficient Electrocatalyst for Water Oxidation and for a Zinc-Air Battery

Title
Porous LaCo1-xNixO3-delta Nanostructures as an Efficient Electrocatalyst for Water Oxidation and for a Zinc-Air Battery
Authors
Vignesh, A[Vignesh, Ahilan]Prabu, M[Prabu, Moni]Shanmugam, S[Shanmugam, Sangaraju]
DGIST Authors
Vignesh, A[Vignesh, Ahilan]; Prabu, M[Prabu, Moni]; Shanmugam, S[Shanmugam, Sangaraju]
Issue Date
2016-03-09
Citation
ACS Applied Materials and Interfaces, 8(9), 6019-6031
Type
Article
Article Type
Article
Keywords
CatalystsChronoamperometryElectric BatteriesElectrocatalystsElectrocatalytic ActivityElectrochemical Surface AreaElectrodesInterconnected ParticlesLaCo1-xNixO3-DeltaLanthanumNano-StructuresNickelOxidationOxygenOxygen ElectrodeOxygen Evolution ActivityOxygen Evolution ReactionPerovskitePerovskitesPrecious MetalsPrimary BatteriesRotating DisksRutheniumTransition-MetalssWater OxidationZincZinc-Air Battery
ISSN
1944-8244
Abstract
Perovskites have emerged as promising earth-abundant alternatives to precious metals for catalyzing the oxygen evolution reaction (OER). Herein, we report the synthesis of a series of porous perovskite nanostructures, LaCo0.97O3-δ, with systematic Ni substitution in Co octahedral sites. Their electrocatalytic activity during the water oxidation reaction was studied in alkaline electrolytes. The electrocatalytic OER activity and stability of the perovskite nanostructure was evaluated using the rotating disk electrode technique. We show that the progressive replacement of Co by Ni in the LaCo0.97O3-δ perovskite structure greatly altered the electrocatalytic activity and that the La(Co0.71Ni0.25)0.96O3-δ composition exhibited the lowest OER overpotential of 324 and 265 mV at 10 mA cm-2 in 0.1 M KOH and 1 M KOH, respectively. This value was much lower than that of the noble metal catalysts, IrO2, Ru/C, and Pt/C. Furthermore, the La(Co0.71Ni0.25)0.96O3-δ nanostructure showed outstanding electrode stability, with no observable decrease in performance up to 114th cycle in the auxiliary linear sweep voltammetry that lasted for 10 h in chronoamperometry studies. The excellent oxygen evolution activity of the La(Co0.71Ni0.25)0.96O3-δ perovskite nanostructure can be attributed to its intrinsic structure, interconnected particle arrangement, and unique redox characteristics. The enhanced intrinsic electrocatalytic activity of the La(Co0.71Ni0.25)0.96O3-δ catalyst was correlated with several parameters, such as the electrochemical surface area, the roughness factor, and the turnover frequency, with respect to variation in the transition metals of the perovskite structure. Subsequently, La(Co0.71Ni0.25)0.96O3-δ was utilized as the air cathode in a zinc-air battery application. © 2016 American Chemical Society.
URI
http://hdl.handle.net/20.500.11750/2711
DOI
10.1021/acsami.5b11840
Publisher
American Chemical Society
Related Researcher
  • Author Shanmugam, Sangaraju Advanced Energy Materials Laboratory
  • Research Interests Electrocatalysts for fuel cells; water splitting; metal-air batteries; Polymer electrolyte membranes for fuel cells; flow batteries; Hydrogen generation and utilization
Files:
There are no files associated with this item.
Collection:
Energy Systems EngineeringAdvanced Energy Materials Laboratory1. Journal Articles


qrcode mendeley

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

BROWSE