Electrodeposited osmium three-dimensional anodes for direct borohydride fuel cells

V. W.S. Lam, D. C.W. Kannangara, A. Alfantazi, E. L. Gyenge

Research output: Contribution to journalArticlepeer-review

24 Scopus citations


Three-dimensional Os anodes for direct borohydride fuel cells (DBFC) were developed by surfactant assisted electrodeposition of Os on two fibrous graphite substrates, AvCarb™ P75 and GF-S3, respectively. Structural characterization of the electrodes using SEM, TEM, and XPS revealed cluster-like Os deposits composed of nano-sized particles of less than 5 nm in diameter with partially oxidized surfaces. The structural and compositional features of the graphite fiber matrixes had a profound influence on the crystallography of the electrodeposited Os. The polycrystalline Os/AvCarb™ P75 exhibited superior electrocatalytic activity in cyclic voltammetry compared to Os/GF-S3 with respect to oxidation of adsorbed intermediates. To explain the different activity XRD was used to investigate the crystallographic differences between the two electrodes. A DBFC with Nafion ® 117 membrane and operated at 333 K, with Os/AvCarb™ P75 anode (1.7 mg cm -2 Os) and 4 mg cm -2 Pt black oxygen cathode catalyst, generated a peak power density of 109 mW cm -2 with a standard error of the mean of ±12 mW cm -2 at 90% confidence level. The longer-term durability of the newly developed anodes was investigated.

Original languageBritish English
Pages (from-to)57-65
Number of pages9
JournalJournal of Power Sources
StatePublished - 15 Aug 2012


  • Direct borohydride fuel cell
  • Electrodeposition
  • Three-dimensional electrode


Dive into the research topics of 'Electrodeposited osmium three-dimensional anodes for direct borohydride fuel cells'. Together they form a unique fingerprint.

Cite this