A high-energy-state biomimetic enzyme of oxygen-deficient MnTiO3 nanodiscs for sensitive electrochemical sensing of the superoxide anion. Issue 54 (19th June 2019)

• Record Type: Journal Article
• Authors: Zhao, Shenfei; Shi, Zhuanzhuan; Guo, Chun Xian; Li, Chang Ming
• Is Part Of: Chemical communications. Volume 55:Issue 54(2019)
• Page Start: 7836
• Page End: 7839
• Publication Date: 2019-06-19
• Subjects: Chemistry -- Periodicals; 540
• DOI: 10.1039/c9cc02679g
• Languages: English
• ISSNs: 1359-7345

Abstract

Abstract : A high-energy-state biomimetic enzyme for the superoxide anion is presented by inducing surface oxygen defects in MnTiO3 nanodiscs. Abstract : It is of great importance to determine the superoxide anion (O2 ˙ − ), a kind of active free radical that plays important roles in catalytic and biological processes. We present here a high-energy-state biomimetic enzyme with extraordinary activity for O2 ˙ − by inducing surface oxygen defects in MnTiO3 nanodiscs. Oxygen defects enable surface rich active Mn sites with high oxidation ability, which significantly promote the adsorption and electro-oxidation of O2 ˙ − . The oxygen deficient MnTiO3 towards O2 ˙ − exhibits a sensitivity of 126.48 μA μM −1 cm −2 and a detection limit of 1.54 nM, among the best performance of O2 ˙ − sensing platforms.