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. 2016 Apr 21;7:11399. doi: 10.1038/ncomms11399

Table 1. XPS analysis results of Mo 3d spectra obtained on the CNT-carbon electrodes modified with POM anions.

Binding energy (eV) Oxidation state Area %
      SL-CNT ESD-NaPOM-CNT ESD-NH4POM-CNT ESD-HPOM-CNT
232.0 Mo 3d5/2 5+ 8.1 6.7 3.0 6.8
233.1   6+ 52.0 53.4 57.0 53.4
235.1 Mo 3d3/2 5+ 5.4 4.4 2.0 4.5
236.2   6+ 34.6 35.6 38.0 35.5
  FWHM (eV) 1.6 eV 1.4 eV 1.3 eV 1.4 eV

CNT, carbon nanotube; ESD, electrospray deposition; FWHM, full-width at half-maximum; POM, polyoxometalate; SL, soft landing; XPS, X-ray photoelectron spectroscopy.