The influence of ruthenium substitution in LaCoO3 towards bi-functional electrocatalytic activity for rechargeable Zn–air batteries
| Autor: | Guruprakash Karkera, Rachel A. Caruso, Kunkanadu R. Prakasha, Prabu Moni, Annigere S. Prakash, Shivaraju Guddehalli Chandrappa, Dehong Chen |
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| Rok vydání: | 2020 |
| Předmět: |
Battery (electricity)
Materials science Renewable Energy Sustainability and the Environment Inorganic chemistry Oxygen evolution chemistry.chemical_element 02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Energy storage 0104 chemical sciences Catalysis Ruthenium chemistry X-ray photoelectron spectroscopy Lanthanum General Materials Science Orthorhombic crystal system 0210 nano-technology |
| Zdroj: | Journal of Materials Chemistry A. 8:20612-20620 |
| ISSN: | 2050-7496 2050-7488 |
| DOI: | 10.1039/d0ta06673g |
| Popis: | The rechargeable zinc–air battery is a clean technology for energy storage applications but is impeded by the slow kinetics of the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) during its cycling. Herein, a series of lanthanum cobaltate based perovskites are synthesised with the B-site cation deficiencies in the structure occupied by Ru substitution: LaCo1−xRuxO3−δ (x = 0, 0.1, 0.2, 0.3 and 0.5). These compositions were designed to enhance the OER/ORR activities, which are two vital reactions for rechargeable Zn–air batteries. Powder X-ray diffraction analysis revealed that increasing the Ru substitution >20% (x > 0.2) alters the LaCoO3 crystal structure from rhombohedral to orthorhombic. Photoelectron spectroscopy studies reveal that the surface oxygen vacancies increased in the Ru substituted catalyst, a property important for enhancing the OER/ORR efficiency. The LaCo0.8Ru0.2O3−δ (LCRO82) catalyst exhibits promising electrocatalytic activities in both the OER and the ORR in 0.1 M KOH solution. Furthermore, the LCRO82 catalyst was evaluated as a cathode for rechargeable Zn–air battery applications displaying a high power density of 136 mW cm−2 at a current density of 175 mA cm−2 and a stable charge–discharge voltage gap of 0.78 V after 1440 cycles, with excellent cycling stability over 240 h. |
| Databáze: | OpenAIRE |
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