Mixed Transition‐Metal Oxides: Design, Synthesis, and Energy‐Related Applications

TLDR

Mixed transition‑metal oxides (MTMOs) in spinel structures, with tunable stoichiometry, have attracted growing interest due to their exceptional electrochemical properties and potential for low‑cost, environmentally friendly energy storage and conversion. This review surveys recent advances in the rational design and efficient synthesis of MTMOs with controlled morphology and composition, and discusses their use as electrode materials for lithium‑ion batteries, electrochemical capacitors, and electrocatalysts for oxygen reduction in metal‑air batteries and fuel cells, while outlining future trends. The authors review strategies for tailoring MTMO shape, size, composition, and micro‑ and nanostructure to optimize their electrochemical performance.

Abstract

A promising family of mixed transition-metal oxides (MTMOs) (designated as Ax B3-x O4 ; A, B=Co, Ni, Zn, Mn, Fe, etc.) with stoichiometric or even non-stoichiometric compositions, typically in a spinel structure, has recently attracted increasing research interest worldwide. Benefiting from their remarkable electrochemical properties, these MTMOs will play significant roles for low-cost and environmentally friendly energy storage/conversion technologies. In this Review, we summarize recent research advances in the rational design and efficient synthesis of MTMOs with controlled shapes, sizes, compositions, and micro-/nanostructures, along with their applications as electrode materials for lithium-ion batteries and electrochemical capacitors, and efficient electrocatalysts for the oxygen reduction reaction in metal-air batteries and fuel cells. Some future trends and prospects to further develop advanced MTMOs for next-generation electrochemical energy storage/conversion systems are also presented.