Work

Impact of Strontium-Substitution on Oxygen Evolution Reaction of Lanthanum Nickelates in Alkaline Solution

Year: 2018

Type: article

Abstract: In the present study, activity for anodic oxygen evolution reaction (OER) has been evaluated by varying the degree of Sr 2 + -substitution in La 1 − x Sr x NiO 3 from x = 0.0 to 1.0. EDS was utilized to measure the elemental composition. XRD and Rietveld refinement were employed for the phase and crystal structure analysis. It was observed that the crystal structure of LaNiO 3 was distorted after Sr 2 + -substitution and formed tetragonal lanthanum-strontium nickelates (LSN) for x ⩽ 0.8, and rhombohedral strontium nickelate for x = 1.0. For all the samples, secondary phases (NiO for 0.2 ⩽ x ⩽ 1.0 and SrCO 3 for 0.8 ⩽ x ⩽ 1.0) were also observed. Rietveld analysis suggests that Sr 2 + -substitution caused the cell volume to contract. The oxidation state of Ni in the samples were investigated by XPS for the elusive Ni 4 + . An increase in the mass specific activity for OER was observed as the degree of Sr 2 + -substitution increase until x = 0.6, however, the activity decreased for higher values of x . The LSN samples were significantly more active than that of LaNiO 3 , and the state-of-the-art electrocatalyst Ba 0.5 Sr 0.5 Co 0.8 Fe 0.2 O 3 − δ .

Source: Journal of The Electrochemical Society

DOI: 10.1149/2.0301815jes

Authors: Ravi Sankannavar, K. C. Sandeep, Sachin Kamath, Akkihebbal K. Suresh, A. Sarkar

Institutions: Indian Institute of Technology Bombay, Bhabha Atomic Research Centre, Homi Bhabha National Institute

Language: English

Topic: Electrocatalysts for Energy Conversion

Subfield: Renewable Energy, Sustainability and the Environment

Field: Energy

Domain: Physical Sciences

SDG: Affordable and clean energy

Open Access status: hybrid

Estimated APC paid: $1,950