Work

Earth-Abundant Divalent Cation High-Entropy Spinel Ferrites as Bifunctional Electrocatalysts for Oxygen Evolution and Reduction Reactions

Year: 2024

Type: article

Abstract: High Resolution Image Download MS PowerPoint Slide High-entropy spinel ferrites (HESFs) offer long-term stability and activity in oxygen electrochemical reactions due to entropy stabilization and synergistic effects of multiple elements within their crystal structure. However, conventional HESFs often rely on transition metals for high configurational entropy, limiting their accessibility and sustainability. In this study, we successfully synthesized a high-entropy spinel oxide using earth-abundant elements, such as Mg, Cu, and Zn (Mg-Fe 2 O 4 ), addressing the need for more sustainable materials without compromising performance. Despite differences in cation composition, both synthesized HESFs maintain identical crystal structures and lattice constants. Incorporating smaller-radius elements like Mg, Cu, and Zn does not affect the crystal structure, achieving high-entropy spinel ferrites with similar properties to traditional counterparts, e.g., (CoCrFeMnNi)Fe 2 O 4 . Material characterization and electrochemical analyses demonstrate comparable performance, including over 200 h of continuous battery operation. These findings highlight the potential of utilizing more accessible materials to create efficient HESFs, expanding their applicability in energy conversion and storage.

Source: ACS Applied Energy Materials

DOI: 10.1021/acsaem.4c01227

Authors: Tuncay Erdil, Cagla Ozgur, Uygar Geyikci, Ersu Lokcu, Cigdem Toparli

Institutions: Middle East Technical University, Eskişehir Osmangazi University

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: $4,500