물 분해 수소생산을 위한 전이금속(M) 바이메탈형 CoM-ZIF/CdS 광촉매 제조

Recently, due to energy shortages and environmental pollution caused by the continued use of fossilfuels, there is a growing need for renewable sources to replace fossil fuels. ZIF-67 has a porous structure, alarge surface area, high thermal and chemical stability, and a narrow band gap, so it is highly useful as aphotocatalyst. In this study, the CoM-ZIF/CdS photocatalyst based ZIF-67 was synthesized using a chemicalprecipitation method synthesis with four different substances: Ni, Zn, Sn, and Cu. Field emission scanningelectron microscopy analysis revealed that leaf-like particles are formed, and energy dispersive X-rayspectrometer analysis confirmed that CdS exists on the surface, as further evidenced by X-ray diffractometeranalysis. The wurtzite CdS found in the optimized sample is considered the source of the higher photocatalyticactivity. X-ray photoelectron spectroscopy detects all the elements included in the photocatalyst, withprominent peaks of Cd and S on the surface. UV-vis spectroscopy was used to analyze light absorbance. Theband gap changed with various transition metals because the transition metal alters the energy level of theconduction band. The CoNi-ZIF/CdS photocatalyst exhibited the highest hydrogen production rate of 1192.9µmol/g/h, with high reproducibility. The heterojunction between Co-ZIF and CdS reduces recombination. Inconclusion, the synthesis of the CoM-ZIF/CdS photocatalyst results in a photocatalyst with a narrow band gapand an efficient charge separation mechanism.