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关键字：Electrochemistry;Biosensors - Catalysis - Cathodes - Cyclic voltammetry - Electrocatalysis - Electron transitions - Lithium alloys - Lithium batteries - Manganese oxide - Microspheres - Rate constants;Carbon ionic liquid electrode - Cath-ode materials - Direct electrochemistry - Electrochemical behaviors - Electron transfer coefficient - Electron-transfer rate constants - LiMn<inf>2</inf>O<inf>4</inf> - Lithium-ion battery
摘要：Hierarchical LiMn<inf>2</inf>O<inf>4</inf> microspheres were prepared using urchin-like α-MnO<inf>2</inf> as a self-sacrificial template. As the cathode material for lithium ion batteries, the electrochemical properties were characterized by cyclic voltammetry and charge/discharge experiments. The results indicated that the LiMn<inf>2</inf>O<inf>4</inf> microspheres had high discharge capacity and excellent cycle stability. Furthermore, a new electrochemical biosensor was constructed by immobilization of bovine myoglobin (Mb) and LiMn<inf>2</inf>O<inf>4</inf> in a thin film of chitosan (CTS) on the surface of carbon ionic liquid electrode (CILE). Electrochemical behaviors of Mb entrapped in the film were investigated by cyclic voltammetry. A pair of well-defined redox peaks appears, which indicates a fast electron transfer rate of Mb with the underlying CILE. The electron transfer coefficient and electron transfer rate constant of Mb were calculated to be 0.47 and 1.04 s<sup>-1</sup>, respectively. The Mb modified electrode showed good electrocatalytic ability toward the reduction of trichloroacetic acid (TCA) with a detection limit of 0.16 mmol L<sup>-1</sup> (3σ). © 2013 Elsevier Ltd. All rights reserved.
卷号：94
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