Two-step Heating Effect of Hydrochar-MnO2 Formation and Their Electrochemical Performances

Sekar Tri Wulan Amelia, Tantular Nurtono, Heru Setyawan, W. Widiyastuti*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


To improve lignin function in KMnO4 reduction through one-step hydrothermal carbonization (HTC), the HTC method must be modified to produce MnO2-hydrochar. This study proposed an HTC process with two-step heating to enhance the electrochemical performance of hydrochar. HTC is conducted in two-step heating at 100 °C (4 h) followed by 200 °C (8 h). The highest specific capacitance and kinetic current density of 86.76 F/g and 0.32 mA/cm2 were obtained from the KMnO4-NH4OH solution. These findings show that implementing two-step heating in HTC can modify the mechanism and improve the performance of hydrochar.

Original languageEnglish
Pages (from-to)195-206
Number of pages12
Issue number1
Publication statusPublished - Mar 2024


  • electrocapacitive
  • electrocatalytic
  • hydrochar
  • hydrothermal


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