Fe/IRMOF-3 derived porous carbons as non-precious metal electrocatalysts with high activity and stability towards oxygen reduction reaction. (1st July 2016)

• Record Type: Journal Article
• Authors: Sun, Hui; Su, Haixia; Ma, Xingyu; Zhang, Pengfang; Zhang, Xin; Dai, Xiaoping; Gao, Jinsen; Chen, Chi; Sun, Shi-Gang
• Is Part Of: Electrochimica acta. Volume 205(2016)
• Page Start: 53
• Page End: 61
• Publication Date: 2016-07-01
• Subjects: Metal organic framework -- Electrocatalyst -- Porous carbon -- Oxygen reduction reaction -- Active sites; Electrochemistry -- Periodicals; Electrochemistry, Industrial -- Periodicals; 541.37
• DOI: 10.1016/j.electacta.2016.04.037
• Languages: English
• ISSNs: 0013-4686

Abstract

Graphical abstract: A novel 1%Fe/IRMOF-3-900 catalyst was prepared by doping Fe into IRMOF-3 and annealing at 900 °C under N2 flow, which showed the excellent ORR activity and excellent longtime stability. Abstract: By doping iron into isoreticular metal organic framework-3 (IRMOF-3) as a precursor and then annealing at 900 °C under inert gas atmosphere, we have successfully prepared high efficient electrocatalyst of x%Fe/IRMOF-3-900 (x ranges from 1% to 10%) with porous carbon sphere structure. The electrocatalytic properties of the x%Fe/IRMOF-3-900 towards oxygen reduction reaction (ORR) are investigated by using rotating ring disk electrode (RRDE). The results demonstrate that the 1%Fe/IRMOF-3-900 exhibits the highest ORR activity: the onset and half-wave potentials are measured at 1.02 V and 0.88 V vs. RHE, respectively, together with electron transfer number of 3.90 at 0.4 V, kinetic current density of 4.5 mA cm −2 at 0.88 V, and excellent longtime stability in alkaline solution. Such high ORR activity is is superior to many MOFs derived noble metal free electrocatalysts reported so far, and attributed to that the 1%Fe doped could retain the well-defined cubic morphology of the IRMOF-3, resulting in high surface area and large total pore volume, high nitrogen content and high density of electrocatalytic active N-species. This study provides a new strategy for preparation of non-precious metal ORR catalysts using the MOF as a precursor.