Development of robust noble-metal free lanthanum, neodymium doped Li 1.05 Ni 0.5 Mn 1.5 O 4 as a bifunctional electrocatalyst for electrochemical water splitting.

Autor: Rajagopal K; Department of Chemistry, Faculty of Engineering and Technology, SRM Institute of Science and Technology Kattankulathur Tamil Nadu-603203 India abiramin@srmist.edu.in +91 9941223928., Kathiresan M; Electro Organic & Materials Electrochemistry Division, CSIR - Central Electrochemical Research Institute Karaikudi Tamil Nadu-630003 India., Rajaram A; Department of Chemistry, Faculty of Engineering and Technology, SRM Institute of Science and Technology Kattankulathur Tamil Nadu-603203 India abiramin@srmist.edu.in +91 9941223928., Natarajan A; Department of Chemistry, Faculty of Engineering and Technology, SRM Institute of Science and Technology Kattankulathur Tamil Nadu-603203 India abiramin@srmist.edu.in +91 9941223928., Natesan K; Department of Physics, SSN Research Centre, Sri Sivasubramaniya Nadar College of Engineering Chennai 603110 Tamil Nadu India.
Jazyk: angličtina
Zdroj: RSC advances [RSC Adv] 2023 Aug 09; Vol. 13 (34), pp. 23829-23840. Date of Electronic Publication: 2023 Aug 09 (Print Publication: 2023).
DOI: 10.1039/d3ra04495e
Abstrakt: Catalysts for oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) are at the heart of water oxidation reactions. Despite continuous efforts, the development of OER/HER electrocatalysts with high activity at low cost remains a big challenge. Herein, we report a composite material consisting of Li 1.05 Ni 0.5 Mn 1.5 O 4 , Li 1.05 Ni 0.5 La 0.10 Mn 1.40 O 4 , and Li 1.05 Ni 0.5 Nd 0.10 Mn 1.40 O 4 as a bifunctional electrocatalyst for OER and HER applications. Though the catalyst has a modest activity for HER, it exhibits high OER activity thereby making it a better nonprecious electrocatalyst for both OER and HER. The catalytic activity arises from the synergetic effects between LNM-La and LNM-Nd by a facile route that shows excellent and durable bifunctional catalytic activity for OER and HER in the alkaline medium developed. The LNM, LNM-La, and, LNM-Nd displayed current densities of 2.17 V, 1.68 V, and 1.93 V vs. RHE at 10 mA cm -2 respectively. The Tafel slope values obtained for LNM, LNM-La, and LNM-Nd are about 419 mV dec -1 , 118 mV dec -1 , and 378 mV dec -1 respectively. These results indicate the superior electrocatalytic activity of LNM-La with facile OER kinetics.
Competing Interests: The authors declared that there are no conflicts of interest.
(This journal is © The Royal Society of Chemistry.)
Databáze: MEDLINE
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