首页|Atomically dispersed Ni electrocatalyst for superior urea-assisted water splitting
Atomically dispersed Ni electrocatalyst for superior urea-assisted water splitting
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Urea oxidation reaction(UOR)has been selected as substitution for oxygen evolution reaction ascribing to its low thermodynamic voltage as well as utilization of nickel as electrocatalyst.Herein,we report the formation of nickel single atoms(Ni-SAs)as exceptional bifunctional electrocatalyst toward UOR and hydrogen evolution reaction(HER)in urea-assisted water splitting.In UOR catalysis,Ni-SAs perform a superior catalytic performance than Ni-NP/NC and Pt/C ascribing to the formation of HOO-Ni-N4 struc-ture evidenced by in-situ Raman spectroscopy,corresponding to a boosted mass activity by 175-fold at 1.4 V vs.RHE than Ni-NP/NC.Furthermore,Ni-SAs requires only 450 mV overpotential to obtain HER current density of 500 mA cm-2.136 mA cm-2 is achieved in urea-assisted water splitting at 1.7 V for Ni-SAs,boosted by 5.7 times than Pt/C-IrO2 driven water splitting.
Urea oxidation reactionHydrogen evolution reactionNickel single atomsWater splitting
Fang Luo、Shuyuan Pan、Yuhua Xie、Chen Li、Yingjie Yu、Zehui Yang
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College of Materials Science and Engineering,State Key Laboratory of New Textile Materials & Advanced Processing Technology,Wuhan Textile University,Wuhan 430200,Hubei,China
Hubei Hydrogen Energy Technology Innovation Center,Faculty of Materials Science and Chemistry,China University of Geosciences,Wuhan 430074,Hubei,China
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