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In Situ Growth of Ni-Based Metal-Organic Framework Nanosheets on Carbon Nanotube Films for Efficient Oxygen Evolution
Chenchen Qiang1, Min Liu1, Liang Zhang1
1College of Chemistry and Materials Science, Anhui Normal University, Wuhu 241000, People's Republic of China.
Abstract:
Oxygen evolution reaction (OER) is a principal process in electrochemical energy conversion. Unfortunately, the sluggish reaction kinetics of OER hinders large-scale applications of those electrochemical energy conversion technologies. In this article, nickel-based metal-organic framework nanosheets attached on carbon nanotube films were successfully synthesized. The self-supporting electrode exhibits a fascinating activity with an overpotential of 221 mV at a current density of 10 mA cm-2 and long-term stability with 24 h without noticeable changes of current density. In situ Fourier transform infrared testing reveals the formation of the key active intermediates (HO*, O*, and HOO*) during the OER process. A series of material characterization demonstrated that coordinatively unsaturated metal sites on the Ni-BDC are the real active sites in OER.
