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Updated: Apr 21, 2026

Electric-field Control of Electronic States in WS2 Nanodevices by Electrolyte Gating
Published on: April 12, 2018
Periodic current oscillation catalyzed by δ-MnO2 nanosheets
Xing Fan1, Dianpeng Yang, Lifeng Ding
1College of Chemistry and Chemical Engineering, Chongqing University, No.174 Shazhengjie Street, Shapingba District, Chongqing, 400030 (P.R. China).
Abstract:
The oxygen evolution reaction (OER) is of wide interest for both fuel and hydrometallurgy applications. Different types of nanoscale MnO2 , varying from nanosheets to nanoneedles, are synthesized and assembled on the anode to investigate their catalytic effect on the nonlinear kinetics of the MnO2 -catalyzed OER at high current. For δ-MnO2 nanosheets, periodic current oscillations (PCO) occurr and occupy up to 40 % of the total energy consumption. The PCO can help to reduce the energy consumption under constant current conditions. Its amplitude could be twice of that for the previously reported MnO2 grown by an in situ electrochemical method. If the amount of γ-MnO2 nanoneedles increases, the oscillation disappears. For different Mn oxides, the rate constants of H2 O2 decomposition differ, resulting in changes in oscillation features. The results of this study may enable new ideas to improve the efficiency of industrial electrolysis and charging-discharging of supercapacitors.
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