UiO-66-NO2 as an Oxygen "Pump" for Enhancing Oxygen Reduction Reaction Performance
Research output: Journal Publications and Reviews (RGC: 21, 22, 62) › 21_Publication in refereed journal › peer-review
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Original language | English |
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Pages (from-to) | 1646–1654 |
Journal / Publication | Chemistry of Materials |
Volume | 31 |
Issue number | 5 |
Online published | 13 Feb 2019 |
Publication status | Published - 12 Mar 2019 |
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Abstract
In this work, UiO-66-based metal-organic frameworks are investigated as an oxygen reduction reaction (ORR) catalyst for the first time. UiO-66-NO2 is solvothermally grown on the surface of cobalt phthalocyanine-anchored carbon nanotube (CoCNT) surface, serving as an oxygen "pump" to accelerate the oxygen reduction reaction (ORR). The UiO-66-NO2-attached CoCNT (UiO-66-NO2@CoCNT) exhibits superior electrochemical catalytic properties, exceeding the state-of-the-art commercial 20% Pt/C catalyst with more positive half-wave potential (15 mV difference, at 1600 rpm), better stability (no significant degradation for UiO-66-NO2@CoCNT vs 19% degradation for 20% Pt/C after 25 000 s), and higher methanol tolerance. When assembled in a flexible zinc-air battery, the UiO-66-NO2@CoCNT remains a competitive alternative to commercial 20% Pt/C catalyst with comparable power density and excellent flexibility, suggesting its potential in wearable electronic devices. The outstanding performance of UiO-66-NO2@CoCNT composite is closely related to the synergetic effect among the three components: CNT as a conductive backbone, cobalt phthalocyanines as the oxygen reduction catalytic active site, and UiO-66-NO2 as an ideal oxygen adsorption pump (the oxygen diffusion rate is 4.8 times that of 20% Pt/C and 17.7 times that of CoCNT). The synergy between the three components facilitates oxygen adsorption, transfer of adsorbed oxygen molecules, oxygen reduction, and electron conduction.
Citation Format(s)
UiO-66-NO2 as an Oxygen "Pump" for Enhancing Oxygen Reduction Reaction Performance. / Zeng, Shanshan; Lyu, Fucong; Sun, Ligang; Zhan, Yawen; Ma, Fei-Xiang; Lu, Jian; Li, Yang Yang.
In: Chemistry of Materials, Vol. 31, No. 5, 12.03.2019, p. 1646–1654.Research output: Journal Publications and Reviews (RGC: 21, 22, 62) › 21_Publication in refereed journal › peer-review