Chinese Journal of Catalysis ›› 2020, Vol. 41 ›› Issue (10): 1654-1662.DOI: 10.1016/S1872-2067(19)63513-8

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Hierarchical cobalt phenylphosphonate nanothorn flowers for enhanced electrocatalytic water oxidation at neutral pH

Mei-Rong Liua,b, Yang-Peng Lina,b, Kai Wangc, Shumei Chena, Fei Wangb, Tianhua Zhoub   

  1. a College of Chemistry, Fuzhou University, Fuzhou 350108, Fujian, China;
    b State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou 350002, Fujian, China;
    c College of Chemistry and Materials Science, Sichuan Normal University, Chengdu 610068, Sichuan, China
  • Received:2020-02-25 Revised:2020-03-29 Online:2020-10-18 Published:2020-08-15
  • Supported by:
    This work was supported by the National Natural Science Foundation of China (51772291, 21871050).

Abstract: Cobalt-based phosphate/phosphonates are a class of promising water oxidation catalysts at neutral pH. Herein, we reported a facile hydrothermal synthesis of various nanostructured cobalt phenylphosphonates. It is found that the number of hydroxyl group of structure-directing reagent is crucial for the construction of 3D hierarchical structures including hierarchical nanosheet flower-like assemblies and nanothorn microsphere. These samples were characterized by scanning electron microscopy, transmission electron microscopy, X-ray diffraction, infrared, and X-ray photoelectron spectroscopy techniques. They can act as highly efficient electrocatalysts for the oxygen evolution reaction at neutral pH. Among these, hierarchical cobalt phenylphosphonate nanothorn flowers present excellent performance, affording a current density of 1 mA cm-2 required a small overpotential of 393 mV. This work offers a new clue to develop high-performance metal phosphonate/phosphate catalysts toward electrochemical water oxidation.

Key words: Phosphate, Morphology, Electrocatalysis, Neutral pH, Oxygen evolution reaction, Phosphonates