X ray photoelectron spectroscopy X ray diffraction 18 article 18 Adsorption 16 Cyclic voltammetry 16 Electrodes 16 Scanning electron microscopy 16 XPS 16 Mesoporous materials 14 Photoelectrons 14 Electrochemistry 12 Oxygen 12 Photoelectron spectroscopy 12 Reduction 12 chemistry 12 Ions 10 Irradiation 10 Nanoparticles 10 Photoelectron Spectroscopy 10 Porosity 10 X ray diffraction analysis 10 adsorption 10 porosity 10 Catalyst activity 8 Catalysts 8 Cobalt 8 Density functional theory 8 Electrolytes 8 Fourier transform infrared spectroscopy 8 Gold 8