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Download fileNi3N‑Coated Ni Nanorod Arrays for Hydrogen and Oxygen Evolution in Electrochemical Water Splitting
journal contribution
posted on 27.10.2020, 17:35 authored by Hongmei Wang, Jie Xiong, Xing Cheng, Mathias Fritz, Adriana Ispas, Andreas Bund, Ge Chen, Dong Wang, Peter SchaafDesigning
high efficiency non-noble metal catalysts for electrochemical
hydrogen and oxygen evolution reactions (HER and OER) is a challenging
and promising task. In the present work, a large-scale self-supported
black nickel sheet composed of nickel nanorod arrays (B-Ni) was successfully
fabricated via electroplating with a nanostructured Si template assisted
strategy, and Ni3N coating layer was coated on the structured
surface followed by a nitrogen plasma treatment with different treatment
durations. The black color is due to the immensely enhanced light
absorption through the surface nanostructures with high aspect ratio.
The samples show promising catalytic performance when used as electrochemical
catalysts for both HER and OER in alkaline electrolyte. Benefiting
from the nanostructure and the Ni3N coating, B-Ni_N2_10 min exhibits low onset potentials of 1.560 and 0.165 V
at a current density of 10 mA/cm2 for OER and HER, respectively.
The calculated electrochemical surface area (ECSA) for B-Ni is 10
times higher than the pristine Ni sheet (P-Ni), while after nitrogen
plasma treatment, the ECSA for B-Ni_N2_10 min is 21 times
higher than that of the P-Ni. In addition, all the catalysts show
good electrochemical stabilities. All the improvements for the electrochemical
performances suggest that nanostructured nickel nitride could be a
promising inexpensive catalyst system for both OER and HER processes.
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Keywords
electrochemical performanceselectrochemical hydrogenelectrochemical stabilitiesefficiency non-noble metal catalystsNi sheetnanostructured Si templatesamples showlight absorptionHER processesNi 3 N coating layertreatment durationsNi 3 N coatingsurface nanostructuresB-Nielectrochemical surface areanickel sheetOxygen EvolutionElectrochemical Water Splitting Des...ECSAonset potentialscatalysts show10 timesoxygen evolution reactionsP-NiOER0.165 Vcatalyst system21 timesnickel nanorod arraysnitrogen plasma treatmentminelectrochemical catalystsaspect rationanostructured nickel nitride