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Amorphous High-Entropy Hydroxides of Tunable Wide Solar Absorption for Solar Water Evaporation |
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| Authors: | Jie Pan Yan Bao Hao Wang Fucong Lyu Lu Liu Chong Wang Xinxue Tang Jian Lu Yang Yang Li |
| Institution: | 1. Hong Kong Branch of National Precious Metals Material Engineering Research Centre (NPMM), City University of Hong Kong, Kowloon, Hong Kong, P. R. China
Center of Super-Diamond and Advanced Films (COSDAF), City University of Hong Kong, Kowloon, Hong Kong, P. R. China Department of Materials Science and Engineering, City University of Hong Kong, Kowloon, Hong Kong, P. R. China;2. Hong Kong Branch of National Precious Metals Material Engineering Research Centre (NPMM), City University of Hong Kong, Kowloon, Hong Kong, P. R. China Center of Super-Diamond and Advanced Films (COSDAF), City University of Hong Kong, Kowloon, Hong Kong, P. R. China Department of Mechanical Engineering, Greater Bay Joint Division, Shenyang National Laboratory for Materials Science, City University of Hong Kong, Kowloon, Hong Kong, P. R. China Center for Advanced Structural Materials, Greater Bay Joint Division, Shenyang National Laboratory for Materials Science, City University of Hong Kong Shenzhen Research Institute, Shenzhen, P. R. China;3. Hong Kong Branch of National Precious Metals Material Engineering Research Centre (NPMM), City University of Hong Kong, Kowloon, Hong Kong, P. R. China |
| 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. |
| Keywords: | amorphous bandgap high-entropy hydroxides wide-spectrum absorption |