Hydrolysis and electrooxidation of sodium borohydride on novel CNT supported CoBi fuel cell catalyst

Tulin Avci Hansu, Aykut Caglar, Omer Sahin, Hilal Kivrak*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

66 Citations (Scopus)

Abstract

At present, Co, Bi, CoBi, and CoBi/CNT catalysts are prepared via co-precipitation method and sodium borohydride (NaBH4) reduction method for NaBH4 electrooxidation and hydrolysis. These Co, Bi, and CoBi catalysts are characterized by X-ray Diffraction (XRD), Transmission Electron Microscopy (TEM), N2 adsorption-desorption, Inductively Coupled Plasma Mass Spectrometry (ICP-MS), and Temperature Programmed Reduction (TPR). These catalysts are employed for NaBH4 hydrolysis and further measurements are performed to investigate their NaBH4 electrooxidation activity. For NaBH4 hydrolysis, NaOH concentration, reaction temperature, NaBH4 concentration, and catalyst amount are optimized for CoBi and CoBi/CNT catalysts. Furthermore, the rate constants (k) are found between 20 and 50 °C and the activation energy is calculated from the Arrhenius equation. The hydrogen generation rates on CoBi (95–5) and % 10 CoBi (95–5)/CNT catalysts are found as 2605.6 ml H2 g−1cat min−1 and 12996 ml H2 g−1cat min−1, respectively. NaBH4 electrooxidation is investigated with cyclic voltammetry (CV), chronoamperometry (CA), and electrochemical impedance spectroscopy (EIS) measurements. Maximum mass activities are obtained as 5.86 mA mg−1 Co for CoBi and 25.7 mA mg−1 Co for CoBi/CNT catalysts. EIS and CA results are also in a good agreement with CV results in terms of stability and electrocatalytic activity of CoBi/CNT catalyst. The CoBi/CNT catalyst is believed to be a promising anode catalyst for the direct borohydride fuel cell (DBFC).

Original languageEnglish
Article number122031
JournalMaterials Chemistry and Physics
Volume239
DOIs
Publication statusPublished - 1 Jan 2020
Externally publishedYes

Bibliographical note

Publisher Copyright:
© 2019 Elsevier B.V.

Keywords

  • Bismuth
  • Cobalt
  • Cobalt–bismuth
  • Sodium borohydride electrooxidation
  • Sodium borohydride hydrolysis

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