NDLI: Mass-producible 2D-MoSe<sub>2</sub> bulk modified screen-printed electrodes provide significant electrocatalytic performances towards the hydrogen evolution reaction

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Mass-producible 2D-MoSe₂ bulk modified screen-printed electrodes provide significant electrocatalytic performances towards the hydrogen evolution reaction

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Mass-producible 2D-MoSe₂ bulk modified screen-printed electrodes provide significant electrocatalytic performances towards the hydrogen evolution reaction

Content Provider	Royal Society of Chemistry (RSC)
Author	Smith, Graham C. Banks, Craig E. Brownson, Dale A. C. Rowley-Neale, Samuel J. Foster, Christopher W.
Copyright Year	2017
Abstract	We demonstrate a facile, low cost and reproducible methodology for the production of electrocatalytic 2D-MoSe2 incorporated/bulk modified screen-printed electrodes (MoSe2-SPEs). The MoSe2-SPEs outperform traditional carbon based electrodes, in terms of their electrochemical activity, towards the Hydrogen Evolution Reaction (HER). The electrocatalytic behaviour towards the HER of the 2D-MoSe2 within the fabricated electrodes is found to be mass dependent, with an optimal mass ratio of 10% 2D-MoSe2 to 90% carbon ink. MoSe2-SPEs with this optimised ratio exhibit a HER onset, Tafel value and a turn over frequency of ca. −460 mV (vs. SCE), 47 mV dec−1 and 1.48 respectively. These values far exceed the HER performance of graphite (unmodified) SPEs, that exhibit a greater electronegative HER onset and Tafel value of ca. −880 mV and 120 mV dec−1 respectively. It is clear that impregnation of 2D-MoSe2 into the MoSe2-SPEs bulk ink/structure significantly increases the performance of SPEs with respect to their electrocatalytic activity towards the HER. When compared to SPEs that have been modified via a drop-casting technique, the fabricated MoSe2-SPEs exhibit excellent cycling stability. After 1000 repeat scans, a 10% modified MoSe2-SPE displayed no change in its HER onset potential of −450 mV (vs. SCE) and an increase of 31.6% in achievable current density. Conversely, a SPE modified via drop-casting with 400 mg cm−2 of 2D-MoSe2 maintained its HER onset potential of −480 mV (vs. SCE), however exhibited a 27.4% decrease in its achievable current density after 1000 scans. In addition to the clear performance benefits, the production of MoSe2-SPEs mitigates the need to post hoc modify an electrode via the drop-casting technique. We anticipate that this facile production method will serve as a powerful tool for future studies seeking to utilise 2D materials in order to mass-produce SPEs/surfaces with unique electrochemical properties whilst providing substantial stability improvements over the traditionally utilised technique of drop-casting.
Starting Page	74
Ending Page	83
Page Count	10
File Format	HTM / HTML PDF
ISSN	23984902
Volume Number	1
Issue Number	1
Journal	Sustainable Energy & Fuels
DOI	10.1039/c6se00115g
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Molybdenum diselenide Post hoc ergo propter hoc Electrode Graphite Electrochemistry Electronegativity Tafel Carbon Electric current
Content Type	Text
Resource Type	Article
Subject	Fuel Technology Renewable Energy, Sustainability and the Environment Energy Engineering and Power Technology

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