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Published in:
20-10-2020
A CdS quantum dots-sensitized porphyrin-based MOFs for hydrogen evolution reaction in acid media
Published in: Journal of Materials Science: Materials in Electronics | Issue 23/2020
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Abstract
Exploiting a renewable and inexpensive electrochemical catalyst for hydrogen evolution reaction (HER) has attracted great attentions recently. In this study, a MOF catalyst CdS@PCN-224(Ni) was fabricated using CdS quantum dots (QDs) and unique PCN-224(Ni) by a simple hydrothermal method. Due to synergetic effect of the CdS QDs and bimetallic porphyrin MOF structure, the special catalyst showed a great electrocatalytic activity with a low overpotential of 120 mV and a current density of 10 mA/cm2 with a Tafel slope of 90.8 mV/dec, which is approaching to that of the Pt/C (42.8 mV/dec). The double-layer capacitances (Cdl) of CdS@PCN-224(Ni) are 9.75 mF/cm2 which is distinctly superior to that of the PCN-224 (2.33 mF/cm2). Even more to the point, this innovative electrochemical catalyst has a wonderful durability in acid solution, which means it could reach a sustainable utilization. In conclusion, the high activity and low-cost catalyst could be a promising candidate for HER devices in acid media.