Coupling of NiFe Layered Double Hydroxides with Sulfides for Highly Efficient Urea Electrolysis and Hydrogen Evolution

Wenxian Liu (), Zhengguang Qin, Xiaojing Dai, Shibo Meng, Xinxin Niu, Wenhui Shi, Fangfang Wu and Xiehong Cao ()
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Wenxian Liu: College of Materials Science and Engineering, Zhejiang University of Technology, Hangzhou 310014, China
Zhengguang Qin: College of Materials Science and Engineering, Zhejiang University of Technology, Hangzhou 310014, China
Xiaojing Dai: College of Materials Science and Engineering, Zhejiang University of Technology, Hangzhou 310014, China
Shibo Meng: College of Materials Science and Engineering, Zhejiang University of Technology, Hangzhou 310014, China
Xinxin Niu: College of Materials Science and Engineering, Zhejiang University of Technology, Hangzhou 310014, China
Wenhui Shi: Center for Membrane and Water Science & Technology, College of Chemical Engineering, Zhejiang University of Technology, Hangzhou 310014, China
Fangfang Wu: College of Materials Science and Engineering, Zhejiang University of Technology, Hangzhou 310014, China
Xiehong Cao: College of Materials Science and Engineering, Zhejiang University of Technology, Hangzhou 310014, China

Energies, 2023, vol. 16, issue 3, 1-10

Abstract: Urea electrolysis is regarded as a prospective method for energy-saving hydrogen production. However, the practical application of this technology is limited by the lack of high-performance bifunctional catalysts for hydrogen evolution reaction (HER) and urea oxidation reaction (UOR). Herein, a heterostructure catalyst composed of NiFe layered double hydroxide (LDH) and sulfides (NiFe LDH-NiFeS x /NF) catalysts is prepared via a simple one-step hydrothermal approach. Remarkably, the prepared NiFe LDH-NiFeS x /NF required 138 mV and 1.34 V to achieve 10 mA cm −2 for HER and UOR in 1 M KOH and 0.33 M urea, respectively. Furthermore, when NiFe LDH-NiFeS x /NF is used as a cathode for urea electrolysis, only 1.44 V is required at 10 mA cm −2 , which is much lower than the 1.53 V needed for overall water splitting.

Keywords: urea electrolysis; hydrogen evolution reaction; urea oxidation reaction; LDH; sulfides (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2023
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