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Article Abstract
Natural phosphatases featuring paired metal sites inspire various advanced nanozymes with phosphatase-like activity as alternatives in practical applications. Numerous efforts to create point defects show limited metal site pairs, further resulting in insufficient activity. However, it remains a grand challenge to accurately engineer abundant metal site pairs in nanozymes. Herein, we report a grain-boundary-rich ceria metallene nanozyme (GB-CeO) with phosphatase-like activity. Grain boundaries acting as the line or interfacial defects can effectively increase the content of Ce/Ce site pairs to 72.28%, achieving a 49.28-fold enhancement in activity. Furthermore, abundant grain boundaries optimize the band structure to assist the photoelectron transfer under irradiation, which further increases the content of metal site pairs to 88.96% and finally realizes a 114.39-fold enhanced activity over that of CeO without irradiation. Given the different inhibition effects of pesticides on catalysts with and without irradiation, GB-CeO was successfully applied to recognize mixed toxic pesticides.
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| http://dx.doi.org/10.1021/acs.nanolett.4c02394 | DOI Listing |
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