Synthesis and catalysis of copper sulfide/carbon nanodots for oxygen reduction in direct methanol fuel cells

Zih Yu Shih, Arun Prakash Periasamy, Pin Che Hsu, Huan Tsung Chang*

*Corresponding author for this work

Research output: Contribution to journalJournal Article peer-review

62 Scopus citations

Abstract

We have fabricated Cu2-xS/carbon nanodot (C dot) electrodes for direct methanol fuel cells (DMFCs). To the best of our knowledge, this is the first time that Cu2-xS/C dot nanomaterials (NMs) were proposed to be used as a cathode catalyst for oxygen reduction reaction (ORR) in acidic media. The structural characterizations revealed that Cu2-xS alloy possessed two types of crystalline phases, such as Cu9S5 and Cu2S in the structure of Cu2-xS/C dot NMs. The onset potential of the ORR for Cu2-xS/C dot NMs is 0.92V (vs. Ag/AgCl), revealing a good ORR activity of these NMs. The Cu2-xS/C dot electrodes (mass loading: 2.26mgcm-2) provide a mean limiting density of 1.77mAcm-2 at a scan rate of 5mVs-1 and rotation rate of 3600rpm. Electrochemical impedance spectrometry (EIS) results revealed that the charge-transfer resistance (Rct) of the Cu2-xS/C dots was smaller than that of Cu2-xS/CNT. In addition, compared with Pt/C electrodes, Cu2-xS/C dot electrodes were more tolerant against MeOH poisoning. The low-cost, electrochemically stable, and highly active Cu2-xS/C dot electrode has great potential for use in DMFCs.

Original languageEnglish
Pages (from-to)363-369
Number of pages7
JournalApplied Catalysis B: Environmental
Volume132-133
DOIs
StatePublished - 07 03 2013
Externally publishedYes

Keywords

  • Carbon nanodots
  • Cathode catalyst
  • CuS
  • Fuel cells
  • Oxygen reduction reaction

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