Anodic urea oxidation reaction(UOR)is an intriguing half reaction that can replace oxygen evolution reaction(OER)and work together with hydrogen evolution reaction(HER)toward simultaneous hydro-gen fuel generation and urea-rich wastewater purification;however,it remains a challenge to achieve overall urea electrolysis with high efficiency.Herein,we report a multifunctional electrocatalyst termed as Rh/NiV-LDH,through integration of nickel-vanadium layered double hydroxide(LDH)with rhodium single-atom catalyst(SAC),to achieve this goal.The electrocatalyst delivers high HER mass activity of 0.262 A mg-1 and exceptionally high turnover frequency(TOF)of 2.125 s-1 at an overpotential of 100 mV.Moreover,exceptional activity toward urea oxidation is addressed,which requires a potential of 1.33 V to yield 10 mA cm-2,endorsing the potential to surmount the sluggish OER.The splendid cat-alytic activity is enabled by the synergy of the NiV-LDH support and the atomically dispersed Rh sites(located on the Ni-V hollow sites)as evidenced both experimentally and theoretically.The self-supported Rh/NiV-LDH catalyst serving as the anode and cathode for overall urea electrolysis(1 mol L-1 KOH with 0.33 mol L-1 urea as electrolyte)only requires a small voltage of 1.47 V to deliver 100 mA cm-2 with excellent stability.This work provides important insights into multifunctional SAC design from the perspective of support sites toward overall electrolysis applications.

Huachuan Sun;Linfeng Li;Hsiao-Chien Chen;Delong Duan;Muhammad Humayun;Yang Qiu;Xia Zhang;Xiang Ao;Ying Wu;Yuanjie Pang;Kaifu Huo;Chundong Wang;Yujie Xiong

School of Optical and Electronic Information,Wuhan National Laboratory for Optoelectronics,Optics Valley Laboratory,Huazhong University of Science and Technology,Wuhan 430074,China;Center for Reliability Science and Technologies,Chang Gung University,Taoyuan 33302,China;Kidney Research Center,Department of Nephrology,Chang Gung Memorial Hospital,Linkou,Taoyuan 33305,China;School of Chemistry and Materials Science,University of Science and Technology of China,Hefei 230026,China;Pico Center,SUSTech Core Research Facilities,Southern University of Science and Technology,Shenzhen 518055,China;College of Chemistry and Chemical Engineering,Tarim University,Alaer 843300,China

科学通报（英文版）

[1]Huachuan Sun;Linfeng Li;Hsiao-Chien Chen;Delong Duan;Muhammad Humayun;Yang Qiu;Xia Zhang;Xiang Ao;Ying Wu;Yuanjie Pang;Kaifu Huo;Chundong Wang;Yujie Xiong-.Highly efficient overall urea electrolysis via single-atomically active centers on layered double hydroxide)[J].科学通报（英文版）,2022(17):1763-1775

endorsing

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