X-ray photoelectron spectroscopy (XPS) measurements wereperformed on a Kratos Axis Ultra DLD instrument equipped with amonochromatic Al K _ source and using pass energies of 160 eV and40 eV for survey and high-resolution spectra, respectively. Temper-ature programmed reduction (TPR) studies were conducted placingabout 50 mg of the material into a quartz reactor, heating the reac-tor at 12◦C min−1in the 25 mL min−1STP flow of 5 vol.% H2in Ar andstudying the response of a thermal conductivity detector calibratedusing a series of oxide materials.