A High Faraday Efficiency NiMoO4 Nanosheet Array Catalyst by Adjusting the Hydrophilicity for Overall Water Splitting |
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| Authors: | Zining Wang Hui Wang Prof Shan Ji Xuyun Wang Prof Pengxin Zhou Shuhui Huo Prof Vladimir Linkov Prof Rongfang Wang |
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| Institution: | 1. State Key Laboratory Base for Eco-Chemical Engineering, College of Chemical Engineering, Qingdao University of, Science and Technology, Qingdao, 266042 China;2. College of Biological, Chemical Science and Chemical Engineering, Jiaxing University, Jiaxing, 314001 China;3. College of Chemistry and Chemical Engineering, Northwest Normal University, Lanzhou, 730070 China;4. South African Institute for Advanced Materials Chemistry, University of the Western Cape, Cape Town, 7535 South Africa |
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| Abstract: | To obtain a highly active, stable, and binder-free electrode based on transition-metal compounds for water splitting, nickel foam-supported 3D NiMoO4 nanosheet arrays modified with 0D Fe-doped carbon quantum dots (Fe-CQDs/NiMoO4/NF) are synthesized. The structure characterizations indicated that 0D Fe-CQDs are evenly dispersed onto the NiMoO4 sheets of the arrays. The contact angle analysis confirmed that the surface hydrophilia of the arrays is improved after the 0D Fe-CQDs are deposited 3D on the NiMoO4 sheets. Here, both the activity and durability in electrochemical water splitting are significantly enhanced with the Fe-CQDs/NiMoO4/NF catalysts. At a current density of 10 mA cm?2, the resultant Fe-CQDs/NiMoO4/NF revealed an overpotential of only 117 mV for the hydrogen evolution reaction (HER), a relatively low overpotential of 336 mV toward the oxygen evolution reaction (OER), and a Faraday efficiency of up to 99 %. This performance can be attributed to the unique 3D nanosheet array structure, the synergistic effect, and the optimal hydrophilia for gas evolution evolved from the electrode surface. |
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| Keywords: | carbon quantum dots electrocatalysts hydrophilia NiMoO4 arrays water splitting |
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