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Sequential ion exchange strategy to synthesize CoSe2/FeSe2 double-shelled hollow nanocuboids for highly active and stable oxygen evolution reaction

Abstract

Transition metal-based nanostructures have been considered as the promising substitutes for rare-earth metal oxide electrocatalysts toward oxygen evolution reaction (OER). Herein, we report for the first time on a novel multicomponent metal selenides electrocatalyst based on CoSe2/FeSe2 double-shelled hollow nanocuboids (CoSe2/FeSe2 DS-HNCs) with highly oxidative Co3+ species, which is synthesized via a facile sequential ion exchange strategy. The solid Co-precursor nanocuboids are first converted into the intermediate Co2[Fe(CN)6] with a mesoporous and double-shelled hollow structure produced through a facile ligand exchange at room temperature, and then the final CoSe2/FeSe2 DS-HNCs are obtained by a subsequent Se ion exchange reaction. The intermediate product of Co2[Fe(CN)6] plays an important role not only in constructing double-shelled hollow structure but also in providing the Fe source for the growth of the final multicomponent metal selenides. Benefiting from the nanosized double-shelled hollow structure and mesoporous double-metal selenide shells with highly oxidative Co3+ species, the as-prepared CoSe2/FeSe2 DS-HNCs exhibit superior OER performance to state-of-the-art metal selenides, including a small overpotential of 240 mV at the current density of 10 mA cm−2 and the excellent electrochemical durability over 50 h. This work opens up a new avenue towards developing highly active multicomponent noble-metal-free electrocatalysts.

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Supplementary files

Publication details

The article was received on 26 Mar 2019, accepted on 05 May 2019 and first published on 06 May 2019


Article type: Paper
DOI: 10.1039/C9NR02599E
Nanoscale, 2019, Accepted Manuscript

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    Sequential ion exchange strategy to synthesize CoSe2/FeSe2 double-shelled hollow nanocuboids for highly active and stable oxygen evolution reaction

    Y. Hu, C. Xu, Q. Li, J. Shen, Z. Yuan, J. Ning, Y. Zhong and Z. Zhang, Nanoscale, 2019, Accepted Manuscript , DOI: 10.1039/C9NR02599E

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