Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 8, Issue 14, Pages 6795-6803Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d0ta00777c
Keywords
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Funding
- Zhejiang Provincial Natural Science Foundation of China [LQ19E020002, LQ19E020007, LY20E020008]
- National Natural Science Foundation of China [51572121, 51872135, 21633004, 51772071]
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Developing a highly efficient and low-cost oxygen-evolution-reaction (OER) electrocatalyst is an important route to overcome the rate-determining step of water splitting. Here, we directly grew a CoS2 nanoarray core with an N-doped graphitic carbon (NGC) shell on Ni foam (NF) to construct a core-shell nanorod array electrode, CoS2@NGC@NF. The CoS2 core with a high work function (similar to 5.5 eV) tends to capture electrons from the NGC layer (4.5-5.2 eV) to induce an electron-poor NGC shell with a significant downshift of the carbon Fermi level, facilitating the adsorption of O-containing intermediates and affording decreased activation energy during the OER process. As a result, the three-dimensional NGC encapsulated CoS2 array assembly exhibited excellent electrocatalytic OER activity with a low overpotential of 243 mV at a current density of 10 mA cm(-2) and a small Tafel slope of 71 mV dec(-1) in 1.0 M KOH. Our findings may suggest that manipulating the interface energetics by the work function difference is a potential route to the design of high-performance OER electrocatalysts.
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