A bimetallic water-soluble MOF, UTSA-16 (Co/Zn) MOF powder (ProMOF 9100_Dev MOF Powder) synthesized from cobalt acetate (C4H6CoO4), zinc acetate (C4H6O4Zn) and citric acid (C6H8O7) was purchased from Promethean Particles (Nottingham, UK) and used as received. X-ray Diffraction (XRD) was performed to show the chemical phase composition of the MOF (Supporting information 1, Figure ). The intense and sharp peaks were indicative of the high crystallinity of the powder. We used X-ray photoelectron spectroscopy (XPS) measurements to investigate the chemical configurations of the Co/Zn MOF. Figure shows the XPS survey spectra that indicated C1s, Co2p, N1s, Cu2p and Bi4f peaks with no other signals. The high-resolution C1s XPS spectrum in Figure could be fitted into peaks of C-C (285.1 eV), and C=O (289.3 eV). Figure shows the high-resolution Co 2p spectrum.