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A mesoporous C,N-co doped Co-based phosphate ultrathin nanosheet derived from a phosphonate-based-MOF as an efficient electrocatalyst for water oxidation

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Abstract

The discovery of efficient and durable earth-abundant electrocatalysts for water splitting is highly desirable and is still a great challenge. Herein, we report a facile and simple approach to prepare amorphous, mesoporous C,N co-doped Co-phosphate ultrathin nanosheets via the one-step pyrolysis of a Co-based phosphate precursor with different kinds of coordinated atoms and a 2D layered structure. The resulting material supported on glassy carbon (GC) exhibited an excellent OER activity with a low overpotential of 291 mV, which is 21 mV lower than that of IrO2 catalyst on GC (312 mV) in the same alkaline solution, to afford 10 mA cm−2. Besides, this electrocatalyst showed fast kinetics with a Tafel slope of 57 mV decade−1 in a 1.0 M KOH electrolyte, and the polarization curve after continuous 2000 CV cycles showed a negligible difference, indicating its good stability in alkaline media. The highly efficient catalytic performance with long-term stability for OER could be attributed to the following advantages: C,N co-doping facilitates the charge transfer; the amorphous structure and ultrathin 2D nanosheet structure enhance the activity site density; mesoporous structure facilitates the diffusion of O2. This study provides a new strategy for the design and synthesis of heteroatom-doped high performance electrocatalysts for water oxidation based on MOFs with different types of coordination atoms, such as N and O atoms in the MOFs precursor.

Graphical abstract: A mesoporous C,N-co doped Co-based phosphate ultrathin nanosheet derived from a phosphonate-based-MOF as an efficient electrocatalyst for water oxidation

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Publication details

The article was received on 19 May 2019, accepted on 24 Jul 2019 and first published on 25 Jul 2019


Article type: Paper
DOI: 10.1039/C9CY00973F
Catal. Sci. Technol., 2019, Advance Article

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    A mesoporous C,N-co doped Co-based phosphate ultrathin nanosheet derived from a phosphonate-based-MOF as an efficient electrocatalyst for water oxidation

    Z. Huang, W. Lu, B. Wang, W. Chen, J. Xie, D. Pan, L. Zhou and J. Song, Catal. Sci. Technol., 2019, Advance Article , DOI: 10.1039/C9CY00973F

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