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Enhanced Catalysis of Electrochemical Overall Water Splitting in Alkaline Media by Fe Doping in Ni3S2 Nanosheet Arrays
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posted on 2018-05-03, 00:00 authored by Geng Zhang, Yu-Shuo Feng, Wang-Ting Lu, Dan He, Cao-Yu Wang, Yong-Ke Li, Xun-Ying Wang, Fei-Fei CaoThe development of
bifunctional electrocatalysts with high performance
for both hydrogen evolution reaction (HER) and oxygen evolution reaction
(OER) with earth-abundant elements is still a challenge in electrochemical
water splitting technology. Herein, we fabricated a free-standing
electrocatalyst in the form of vertically oriented Fe-doped Ni3S2 nanosheet array grown on three-dimensional (3D)
Ni foam (Fe-Ni3S2/NF), which presented a high
activity and durability for both HER and OER in alkaline media. On
the basis of systematic experiments and calculation, the Fe-doping
was evidenced to increase the electrochemical surface area, improve
the water adsorption ability, and optimize the hydrogen adsorption
energy of Ni3S2, which resulted in the enhancement
of HER activity on Fe-Ni3S2/NF. Moreover, metal
sites of Fe-Ni3S2/NF were proved to play a significant
role in the HER process. During the catalysis of OER, the formation
of Ni–Fe (oxy)hydroxide was observed on the near-surface section
of Fe-Ni3S2/NF, and the introduction of the
Fe element dramatically enhanced the OER activity of Ni3S2. The overall water splitting electrolyzer assembled
by Fe-Ni3S2/NF exhibited a low cell voltage
(1.54 V @ 10 mA cm–2) and a high durability in 1
M KOH. This work demonstrated a promising bifunctional electrocatalyst
for water electrolysis in alkaline media with potential application
in the future.
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bifunctional electrocatalystNi 3 S 2electrochemical water splitting technologywater splitting electrolyzerFe-Niwater adsorption abilityFe-doped Ni 3 S 2 nanosheet arrayWater SplittingHER activitywater electrolysisFe Dopinghydrogen evolution reactionHER processelectrochemical surface areahydrogen adsorption energyEnhanced Catalysisoxygen evolution reactionnear-surface sectionNFNi foammetal sitesOER activityearth-abundant elementsNi 3 S 2 Nanosheet ArraysFe element1 M KOHAlkaline Mediabifunctional electrocatalysts
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