A Green and Facile Synthesis of Carbon-Incorporated Co₃O₄ Nanoparticles and Their Photocatalytic Activity for Hydrogen Evolution

Figure 3

(a) XPS survey spectrum of the Co₃O₄-DC. The inset of (a) is the high resolution XPS C 1S and O 1S. (b) The high resolution XPS Co 2p_3/2.