4.7 Article

Mesoporous cobalt ferrite phosphides/reduced graphene oxide as highly effective electrocatalyst for overall water splitting

Journal

JOURNAL OF COLLOID AND INTERFACE SCIENCE
Volume 605, Issue -, Pages 667-673

Publisher

ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2021.07.117

Keywords

Mesoporous; CoFeP; Reduced graphene oxide; Water splitting

Funding

  1. National Natural Science Foundation of China [51871078, 52071119]
  2. Heilongjiang Science Foundation [LH2020B006]

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The hybrid catalyst of mesoporous cobalt ferrite phosphides hybridized on reduced graphene oxide (rGO) features abundant interfaces and active sites, accelerating electron exchange and ion diffusion. The mesoporous structure prevents aggregation of active sites and allows rapid bubble escape, resulting in significantly improved catalytic performance.
Although the electrochemical production of hydrogen has been considered as a promising strategy to obtain the sustainable resources, the sluggish kinetics of anodic oxygen evolution reaction (OER) hindered the sustainable energy development. Herein, we design mesoporous cobalt ferrite phosphides hybridized on reduced graphene oxide (rGO) as a highly efficient bifunctional catalyst through a simple nanocasting method. The hybrid catalyst possesses the abundant interface, which provides the large active sites, as well as the hybrid rGO accelerates the electron exchange and ion diffusion. Moreover, the mesoporous structure not only prevents the aggregation of actives sites, but also benefits for the rapid escape of bubbles during catalytical process, which can significantly improve the catalytic performance. Consequently, the resulting mCo0.5Fe0.5P/rGO shows superior catalytic performance with a low overpotential of 250 mV at a current density of 10 mA cm2 for OER and outstanding long-term stability. More importantly, an electrolyzer with mCo0.5Fe0.5P/rGO as both anode and cathode catalysts shows a

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