Effects of boron doping in low- and high-surface-area carbon powders

Young Jae Lee, Yasuo Uchiyama, Ljubisa R. Radovic

Research output: Contribution to journalArticle

25 Scopus citations

Abstract

Two distinctive carbon materials (Saran char and SP-1 graphite) were doped with B at different loading to clarify the intrinsic effect of substitutional B on carbon reactivity. The carbon precursors would be affected in different style by substitutional B due to different important properties (crystallinity and surface area). The B retentivity depended on the nature of B dopant and carbon substrate; a less ordered carbon has higher B loading than its counterpart. Graphitization was enhanced by substitutional B, as expected. Furthermore, the B incorporation was still beneficial for SP-1 although it already had high crystallinity. An interesting behavior was noticed; the increase in L a was greater than Lc. The intrinsic effect of substitutional B in carbon oxidation was proved to be a catalytic one. Unlike highly ordered SP-1 graphite, Saran char showed both a catalytic effect at low B loading and low conversion, and an inhibiting effect at high B loading and high conversion. The inductive effect was proposed to explain this catalytic effect on different crystallite size. Different sizes of carbon clusters were calculated by Gaussian 98W; the extent of the effect of substitutional B did get smaller to the carbon in bigger size of carbon cluster.

Original languageEnglish (US)
Pages (from-to)2233-2244
Number of pages12
JournalCarbon
Volume42
Issue number11
DOIs
StatePublished - Jul 26 2004

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Materials Science(all)

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