Amorphous High‐Entropy Hydroxides of Tunable Wide Solar Absorption for Solar Water Evaporation. (2nd September 2021)

• Record Type: Journal Article
• Authors: Pan, Jie; Bao, Yan; Wang, Hao; Lyu, Fucong; Liu, Lu; Wang, Chong; Tang, Xinxue; Lu, Jian; Li, Yang Yang
• Is Part Of: Particle and particle systems characterization. Volume 38:Number 10(2021)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2021-09-02
• Subjects: amorphous -- bandgap -- high‐entropy -- hydroxides -- wide‐spectrum absorption; Particles -- Periodicals; 620.43
• DOI: 10.1002/ppsc.202100094
• Languages: English
• ISSNs: 0934-0866

Abstract

Abstract: The high‐entropy materials have raised much attention in recent years due to their extraordinary performances in mechanical, catalysis, energy storage fields. Herein, a new type of high‐entropy hydroxides (e.g., NiFeCoMnAl(OH)x ) that are amorphous and capable of broad solar absorption is reported. A facile one‐pot co‐precipitation method is employed to synthesize these amorphous high‐entropy hydroxides ( a ‐HEHOs) under ambient conditions. The a ‐HEHOs thus obtained display widely tunable bandgap (e.g., from 2.6 to 1.1 eV) due to their high‐entropy and amorphous characteristics, enabling efficient light absorbance and photothermal conversion in the solar regime. Further solar water evaporation measurements show that the a ‐HEHOs delivered a considerable energy conversion efficiency of 55%, comparable to black titanium oxides that are synthesized using more complex and expensive methods. Abstract : A new type of amorphous high‐entropy hydroxides is conveniently fabricated by mixing salt solutions, enabling tunable wide solar absorption and efficient solar water evaporation.