Journal
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
Volume 44, Issue 18, Pages 9203-9209Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijhydene.2019.02.096
Keywords
Water splitting; HER catalyst; Self-adaption; Cobalt phosphide
Categories
Funding
- National Natural Science Foundation of China [21573033]
- Natural Science Foundation of Shandong Province [ZR2018BB037]
- project of Shandong Province Higher Educational Science and Technology Program [J17KA104]
- project of Qingdao Applied Basic Research Programs of Science and Technology [18-2-2-10-jch, 18-2-2-35-jch]
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Noble-metal-free transition metal based phosphides (TMPs) display great potential as candidates to replace the state-of-the-art noble metal-based catalysts for electronic water splitting. In this study, amorphous Co2P was decorated on Co-polyoxometalate (POM) and conductive cobalt phosphide forming integrated Co2P@ Co2P/Co-POM/NF electrode, through in suit growth, low-temperature phosphating and electrocatalytic self-adaption pathway by the stripping of superficial Co-POM when subjected to persistent bubbles. The fantastic design simultaneously offers excellent electrical conductivity for fast electron transfer, a large surface area with numerous active edge sites and a conductive current collector facilitating mass transfer and gas release. The electrode showed high catalytic activity, requiring overpotential of 130 mV for HER to achieve a current density of 50 mA/cm(2), 336 mV for OER to achieve a current density of 50 mA/cm(2), affording a water-splitting current density of 10 mA/cm(2) at a low cell voltage of 1.6 V. The results and facile synthesis method also offer an exciting avenue for the design of amorphous phase TMPs on a current collector with high specific area and excellent electrical conductivity for energy storage and conversion devices. (C) 2019 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
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