Fig. 4: LiFePO4 NPs as verification materials and their POD-like activity. | Nature Communications

Fig. 4: LiFePO4 NPs as verification materials and their POD-like activity.

From: Depletable peroxidase-like activity of Fe3O4 nanozymes accompanied with separate migration of electrons and iron ions

Fig. 4: LiFePO4 NPs as verification materials and their POD-like activity.The alternative text for this image may have been generated using AI.

a The crystal structure of LiFePO4 and FePO4 viewed along the a, b, c-axis. The olivine structure is maintained during Li-ions insertion and extraction. b The SEM image of as-synthesized LiFePO4 NPs. The image was collected at least three times. Inset is a photo of LiFePO4 NPs aqueous solution. c The POD-like activity of LiFePO4 NPs (6.25 μg Fe/mL) with TMB (1.7 mM) as colorimetric substrates under the presence of H2O2 (0.8 M) in 0.2 M acetate buffer (pH = 3.6). d ESR spectra of spin adducts DMPO/·OH produced by LiFePO4 NPs (10 μg/mL) in the presence or absence of H2O2 (0.165 M) in 0.2 M acetate buffer (pH = 3.6). e Comparison of the anano of as-synthesized LiFePO4 NPs and cc-Fe3O4 NPs. Error bars represent standard deviation from three independent measurements. f Diagram of the POD-like catalytic reaction process of LiFePO4 NPs and Fe3O4 NPs.

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