Abstract
The electrochemical behavior and the reversible hydrogen storage capacity of multiwalled carbon nanotubes (MWNTs) have been investigated both in alkaline (6 M KOH) and acid (0.3 M H 2SO 4) electrolytic solutions by cyclic voltammetry and constant current charge/discharge measurements. Different purification treatments were performed on as-prepared MWNTs to improve hydrogen uptake. About 0.1 wt% of hydrogen was reversibly stored in MWNTs after nitric acid treatment. Vacuum annealing (950°C, 1 h) of MWNTs lowered the electrochemical hydrogen uptake. Finally, electrochemical oxidation of MWNTs at high potentials allowed an increase in hydrogen charge capacity to 0.3 wt%.
Original language | English |
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Journal | Electrochemical and Solid-State Letters |
Volume | 7 |
Issue number | 5 |
DOIs | |
Publication status | Published - 2004 |
Externally published | Yes |
ASJC Scopus subject areas
- Electrochemistry
- Materials Science(all)