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In situ growth of layered double hydroxides on boehmite AlOOH for the active and stable oxygen evolution in alkaline media

Abstract

Among all the non-precious electrocatalysts toward oxygen evolution reaction (OER), FeNi or FeCo layered double hydroxides (LDHs) display the best activity. However, due to the unavoidable transfer of the active M3+/4+ (M = Fe, Co, Ni) ions to inert M-O-H species, the activity dramatically decreases after about 25 hours’ stability test, which means the widely-adopted stability test with a duration within 24 hours is not enough for LDHs. Here the in situ growth of Fe1Co1 or Fe1Ni1 LDH nanosheets on V- or Ni-doped AlOOH nanorods could elongate the duration of stable electrocatalysis to 50 hours. The V and Ni dopants are found to promote the diffusion of active Fe, Co and Ni cations along the abundant {100} planes of AlOOH single-crystalline nanorods whose {100} family of crystal planes are perpendicular to the lateral facet, avoiding the aggregation of the active species together with the transfer to the inert ones and the following nucleation and growth of them. Besides, the nano-channels on the nanorods generated during the following in situ growth of LDHs are beneficial for the supply of OH- and the transpiration of O2, which enhances the activity and stability of these composites.

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Supplementary files

Publication details

The article was received on 12 Mar 2019, accepted on 02 May 2019 and first published on 03 May 2019


Article type: Paper
DOI: 10.1039/C9NR02148E
Nanoscale, 2019, Accepted Manuscript

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    In situ growth of layered double hydroxides on boehmite AlOOH for the active and stable oxygen evolution in alkaline media

    S. He and H. Lin, Nanoscale, 2019, Accepted Manuscript , DOI: 10.1039/C9NR02148E

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