Band gap and oxygen vacancy engineering of honeycomb‐like CuFe2O4 spinels toward enhanced high infrared emissivity

• DOI: 10.1111/jace.19067
• Publication Date: 2023-02-28T03:54:33Z
• Authors: Kai Cui; Minghui Sun; Tianyu Gong; Jiali Xu; Linrui Hou; Changzhou Yuan
• Keywords: 01 natural sciences; 7. Clean energy; 0104 chemical sciences

Abstract Recently, copper ferrites have acquired widespread attraction in high infrared radiation fields owing to their remarkable cost efficiency. However, achieve broader applications under various operating conditions, it is essential further improve the emissivity, particularly at temperatures. Herein, Ni‐doped CuFe 2 O 4 (NCFO) honeycomb‐like frameworks, which are constructed with single‐crystal nano‐subunits, successfully fabricated via scalable sol–gel avenue. The unique porous honeycomb framework endows NCFO enhanced absorption and relieves stress between coatings substrates meanwhile. With both band gap oxygen vacancy (OV) engineering of itself smart Ni doping, a maximum lattice strain, richest OVs, narrowest (∼1.63 eV) simultaneously achieved for 15% doping (denoted as CNFO‐15). Benefiting from synergy these external intrinsic contributions, CNFO‐15 possesses an ultrahigh emissivity (∼0.975) wavelength range 3–5 µm test temperature 800°C. Moreover, CNFO‐15‐based coating displays superior performance outstanding high‐temperature resistance. More meaningfully, constructive design here will provide distinctive perspective future large‐scale fabrication advanced high‐infrared‐emissivity coatings.