High entropy LDH heterojunction electrocatalyst for efficient oxygen evolution reaction
Yang Cao, Qianwei Wang, Zhicheng Wang, Jie Gao, Guozheng Lv, Na Du, Yanchun Liu, Xinli Wang, Feng Cao
Abstract
The creation of highly efficient non-noble metal catalysts for oxygen evolution reaction (OER) is crucial for the electrochemical water splitting. Harnessing the synergistic effects of heterojunctions and high-entropy layered double hydroxides (LDH) to improve electron configurations is a promising approach. The straightforward and swift synthesis of high-entropy LDH catalysts remains a great challenge. In this work, we develop a novel, non-nobel metal high-entropy heterojunction electrocatalyst , synthesized via in - situ electrochemical deposition of FeCoNiCrMn LDH onto a CuO mesh. The integration of FeCoNiCrMn LDH with the CuO core through heterojunction engineering facilitates the harmonious manipulation of surface electron and expedites the electron transfer. The optimized CuO@FeCoNiCrMn LDH heterojunction demonstrates a low overpotential of 251 mV at 100 mA cm −2 , with a Tafel slope of 34.1 mV dec -1 , and enduring stability in alkaline condition over 40 h. Moreover, the CuO@FeCoNiCrMn LDH||Pt/C electrolyzer achieves current densities of 10 and 100 mA cm −2 at merely 1.50 and 1.54 V, respectively, with enduring stability. This research clears the path for the production of high-entropy hydroxide heterojunction catalysts, which are highly efficient and cost-effective.