Premium
Sodium Cobalt Metaphosphate as an Efficient Oxygen Evolution Reaction Catalyst in Alkaline Solution
Author(s) -
Gond Ritambhara,
Singh Dheeraj Kumar,
Eswaramoorthy Muthusamy,
Barpanda Prabeer
Publication year - 2019
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.201901813
Subject(s) - metaphosphate , overpotential , catalysis , cobalt , electrocatalyst , chemistry , oxygen evolution , inorganic chemistry , carbon fibers , materials science , electrochemistry , composite number , electrode , organic chemistry , phosphate , composite material
Sodium cobalt metaphosphate [NaCo(PO 3 ) 3 ] has CoO octahedra (CoO 6 ) and shows superior oxygen evolution reaction (OER) activity in alkaline solution, comparable with the state‐of‐the‐art precious‐metal RuO 2 catalyst. OER catalysts of this metaphosphate are prepared by combustion (Cb) and solid‐state (SS) methods. The combustion‐assisted method offers a facile synthesis and one‐step carbon composite formation. Unusually high catalytic activity was observed in NCoM‐Cb‐Ar and could be due to chemical coupling effects between NaCo(PO 3 ) 3 and partially graphitized carbon. This novel electrocatalyst exhibits very small overpotential of 340 mV with high mass activity of 532 A g −1 . Good charge transfer abilities and chemical coupling between NaCo(PO 3 ) 3 and amorphous carbon gives the OER activity in NCoM‐Cb‐Ar.