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Download fileNickel/Nickel Oxide-Nitrogen Self-Doped Carbon Nanosheets for Electrocatalytic Oxygen and Hydrogen Evolution Reactions
journal contribution
posted on 2022-02-09, 19:13 authored by Yixin Liu, Guizhen Mou, Yuqing Wang, Fangzhen He, Na Dong, Yasu Lin, Ming Zhong, Bitao SuThe
search for bifunctional electrocatalysts with low cost and
high efficiency to drive the development of water splitting is essential
for sustainable energy conversion. In this work, a simple two-step
biomass-assisted impregnation–calcination strategy was adopted
to prepare a series of porous nickel/nickel oxide-nitrogen self-doped
carbon (Ni/NiO-NC) nanosheet composites using waste corn stalks (CSs)
as a multifunctional template, reductant, and carbon and nitrogen
sources. The contents of carbon, nickel, and nickel oxide components
can be adjusted by varying the calcination temperature and CS amount.
When they are applied as electrocatalysts in the oxygen evolution
reaction (OER) and the hydrogen evolution reaction (HER), the optimal
Ni/NiO-NC nanosheet obtained at 300 °C and 1.00 g of CS displays
the best OER and HER activities in 1.0 M KOH media with low overpotentials
of 293 and 179 mV at 10 mV cm–2, small Tafel slopes
of 141 and 111 mV dec–1, respectively, and good
stability. Furthermore, a water electrolyzer is also fabricated by
utilizing cheap nonprecious Ni/NiO-NC-300 as both OER and HER catalysts
to investigate the water-splitting performance. This as-reported simple,
environmental, and cheap strategy could be extended to develop other
two-dimensional transition-metal-based nanosheet electrocatalysts
for a high-performance water-splitting reaction.
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Keywords
sustainable energy conversionhydrogen evolution reactionscheap strategy couldhydrogen evolution reaction111 mv dec10 mv cmoxygen evolution reactionnc nanosheet obtainedbased nanosheet electrocatalysts300 ° cnickel oxide componentsdoped carbon nanosheetssplitting reaction179 mvnickel oxideelectrocatalytic oxygendoped carbonstep biomasssplitting performancereported simpleporous nickelnitrogen sourcesnitrogen selfmultifunctional templatelow overpotentialslow costkoh mediagood stabilitydimensional transitioncs displayscs amountcalcination temperaturebifunctional electrocatalystsalso fabricated00 g