Journal
ELECTROCHIMICA ACTA
Volume 337, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2020.135799
Keywords
Hydrogen evolution reaction; NiCoP@phosphate nanocages; Oxygen evolution reaction; Water splitting
Categories
Funding
- National Key Research and Development Program of China [2016YFC0401101]
- National Natural Science Foundation of China [518250804, 51821006, 51738012]
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The construction of bifunctional highly active and durable electrocatalysts for hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) is attractive and challenging for overall water splitting. Herein, we reported a Ni-Co phosphide @phosphate nanocages (NCPP NCs) catalyst prepared by phosphorization of Ni-Co layered double hydroxide (Ni-Co LDH) with in-situ formation of phosphate. The NCPP NCs exhibited an improved wettability with a contact angle of approximately 0 degrees compared with those of Ni-Co LDH (52 degrees) and nickel-cobalt phosphides (NiCoP) (99 degrees). NCPP NCs have been used for enhancing the water-splitting efficiency, and it only required the overpotentials of 291 mV and 140 mV for OER and HER in 0.1 M KOH to achieve the current densities of 10 mA cm(-2), respectively. Impressively, the overpotential of NCPP NCs decreased by 42 mV and 64 mV at 10 mA cm(-2) for OER in comparison with those of Ru0 2 and NiCoP (without phosphate phase). Consequently, NCPP NCs, as the bifunctional catalysts, displayed an outstanding performance for the whole water-splitting process with a small potential of 1.60 V at 10 mA cm(-2) and long-term stability. These performances enabled this material to be a promising catalyst for overall water electrolysis. (C) 2020 Elsevier Ltd. All rights reserved.
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