Journal
APPLIED SURFACE SCIENCE
Volume 508, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.apsusc.2019.145127
Keywords
Tungsten oxide; Activated carbon; Electrocatalysis; Oxygen evaluation reaction; Hydrogen evaluation reaction
Categories
Funding
- National Research Foundation (NRF) of Korea through the basic science research programs [2016R1A6A1A03012877, 2017R1A2B4004281]
- Korean Government of the Ministry of Education (MoE)
- National Research Foundation of Korea [2017R1A2B4004281] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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The high performance electrocatalysts is vital for enhancing the hydrogen production efficiency for water splitting. In light of this, biomass activated carbon-decorated tungsten oxide (WO3/B-AC) nanocomposites are synthesized through a simple sonochemical method. The WO3/B-AC nanocomposites show an aggregated structure of activated carbon nanosheet-encapsulated tungsten oxide nanoflakes. The WO3/B-AC nanocomposites exhibit the overpotential of 320 mV at 10 mA/cm(2) with the Tafel slope of similar to 48 mV/dec and good stability for the oxygen evolution reaction. For the hydrogen evolution reaction, the nanocomposites also show the overpotential of 360 mV at 10 mA/cm(2) with the Tafel slope of similar to 14 mV/dec and excellent durability in 1 M KOH. The superior electrocatalytic activity of the WO3/B-AC nanocomposite electrode is attributed to the synergetic effect from both the high electrical conductivity of activated carbon nanosheets and the high electrochemically-active surface area of WO3 nanoflakes. These results advocate that the sonochemically synthesized WO3/B-AC nanocomposites hold promise as excellent electrocatalysts for green energy conversion and storage applications.
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