Figure 7.

XPS spectra for N1s core-level peaks in Co-PPy-TsOH/C catalysts prepared from various cobalt precursors. (a) Cobalt acetate; (b) cobalt nitrate; (c) cobalt oxalate; (d) cobalt chloride.

Yuan et al. Nanoscale Research Letters 2013 8:478   doi:10.1186/1556-276X-8-478
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