Influence of Phosphidation on CoSe2 Catalyst for Hydrogen Evolution Reaction

Ranjith Bose, Tae Hyun Kim, Beomsoo Koh, Chi Young Jung, Sung Chul Yi

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    13 Scopus citations

    Abstract

    The development of highly active and earth-abundant electrocatalyst for the hydrogen evolution reaction (HER) is essential for hydrogen based energy technologies. Recently, cobalt chalcogenides and phosphides have been extensively investigated as a promising class of non-precious electrocatalyst for HER because of its high catalytic activity. Here, we have grown a novel and efficient cobalt selenide|cobalt phosphide (CoSe2|CoP) based HER catalyst on carbon fiber paper (CFP) through a facile conversion of CoSe2 nanostructures into a hybrid CoSe2|CoP by phosphidation. Phosphorus compositions in the CoSe2|CoP nanosheets are controllable by adjusting the time duration of phosphidation viz., 15, 30 and 60 min. The catalyst CoSe2|CoP/CFP in acidic media at 30 min showed higher catalytic activity with low overpotential (η) of 140 mV at 10 mA/cm2 and a Tafel slope of 42 mV/dec than parent CoSe2/CFP (η - 219 mV at 10 mA/cm2; Tafel slope - 44 mV/dec) and CoP/CFP (η - 168 mV at 10 mA/cm2; Tafel slope - 86 mV/dec). The improved HER activity of CoSe2|CoP is attributed to the formation of the hybrid nanosheets and the synergistic effect between CoP and CoSe2. Moreover, the surface morphology of CoSe2|CoP at 30 min catalyst plays a significant role in electron transportation. Thus, the present work opens a new potential way to design and develop novel hybrid HER electrocatalysts based on CoSe2|CoP as an efficient energy conversion system through their composition and structural morphology.

    Original languageBritish English
    Pages (from-to)10661-10667
    Number of pages7
    JournalChemistrySelect
    Volume2
    Issue number33
    DOIs
    StatePublished - 21 Nov 2017

    Keywords

    • cobalt selenide hybrid catalyst
    • electrocatalytic activity
    • hydrogen evolution reaction

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