Quasi‐in situ Observation of MnO2Nanorods by Electrochemical Transmission Electron Microscopy for Oxygen Reduction Reaction Process

• DOI: 10.1002/aesr.202300229
• Publication Date: 2024-01-29T03:14:04Z
• Authors: Zengyu Han; Hany Roslie; Shu Fen Tan; Dongshuang Wu
• Keywords: Nanorod

Understanding the electrode materials’ surface is of fundamental importance for catalytic studies as most electrochemical reactions take place there. Although several operando techniques have been used to monitor electrocatalytic process, real‐time imaging observing change on materials are still a challenge and limited few stable systems. Herein, quasi‐in situ transmission electron microscopy (TEM) was carried out track morphological local structure evolution during oxygen reduction reaction (ORR) manganese dioxide (MnO 2 ) first time. The α‐MnO nanorods exhibit comparable ORR activity (half‐wave potential, E 1/2 : 0.83 vs. 0.85 V RHE; diffusion‐limiting current density, J d −5.46 −5.52 mA cm −2 better methanol tolerance than Pt/C. An TEM chip assembled with three‐electrode system perform experiments similar typical testing procedures. ex images consistently showed that MnO had undergone roughening, lattice expansion 0.97% 1.97% in c ‐axis, respectively proceeded. fills gap between characterization spectroscopies deepens mechanistic understanding processes.