Hybrid ternary NiCoCu layered double hydroxide electrocatalyst for alkaline hydrogen and oxygen evolution reaction

Annamalai Raja; Namgyu Son; Young-Il Kim; Misook Kang

doi:10.1016/j.jcis.2023.05.089

Hybrid ternary NiCoCu layered double hydroxide electrocatalyst for alkaline hydrogen and oxygen evolution reaction

J Colloid Interface Sci. 2023 Oct:647:104-114. doi: 10.1016/j.jcis.2023.05.089. Epub 2023 May 19.

Authors

Annamalai Raja¹, Namgyu Son², Young-Il Kim³, Misook Kang⁴

Affiliations

¹ Department of Chemistry, College of Natural Sciences, Yeungnam University, Gyeongsan, Gyeongbuk 38541, Republic of Korea. Electronic address: rajaannamalai@yu.ac.kr.
² Department of Chemistry, College of Natural Sciences, Yeungnam University, Gyeongsan, Gyeongbuk 38541, Republic of Korea.
³ Department of Chemistry, College of Natural Sciences, Yeungnam University, Gyeongsan, Gyeongbuk 38541, Republic of Korea. Electronic address: yikim@ynu.ac.kr.
⁴ Department of Chemistry, College of Natural Sciences, Yeungnam University, Gyeongsan, Gyeongbuk 38541, Republic of Korea. Electronic address: mskang@ynu.ac.kr.

PMID: 37245269
DOI: 10.1016/j.jcis.2023.05.089

Abstract

This study focuses on the electrochemical properties of layered double hydroxide (LDH), which is a specific structure of NiCoCu LDH, and the active species therein, rather than the oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) of ternary NiCoCu LDH materials. Six types of catalysts were synthesized using the reflux condenser method and coated onto a nickel foam support electrode. Compared to bare, binary, and ternary electrocatalysts, the NiCoCu LDH electrocatalyst exhibited higher stability. The double layer capacitance (Cdl) of the NiCoCu LDH (12.3 mF cm^-2) is greater than that of the bare and binary electrocatalysts, indicating that the NiCoCu LDH electrocatalyst has a larger electrochemical active surface area. In addition, the NiCoCu LDH electrocatalyst has a lower overpotential of 87 mV and 224 mV for the HER and OER, respectively, indicating its excellent activity with the bare and binary electrocatalysts. Finally, it is demonstrated that the structural characteristics of the NiCoCu LDH contribute to its excellent stability in long-term HER and OER tests.

Keywords: HER and OER; Layered double hydroxide; NiCoCu LDH; Overpotential; Reflux condenser method.