A highly efficient high-entropy metal hydroxymethylate electrocatalyst for oxygen evolution reaction

• Published in: Chemical engineering journal (Lausanne, Switzerland : 1996) Switzerland : 1996), 2023-02, Vol.453, p.139510, Article 139510
• Main Authors: Jiang, Qi, Lu, Ruihu, Gu, Junfeng, Zhang, Long, Liu, Kailong, Huang, Mengyan, Liu, Peng, Zuo, Shiyu, Wang, Yilong, Zhao, Yan, Ma, Peiyan, Fu, Zhengyi
• Format: Article
• Language: English
• Subjects: Electrochemical activation; High entropy material; Metal hydroxymethylate; OER catalyst; Surface reconstruction
• ISSN: 1385-8947; 1873-3212
• DOI: 10.1016/j.cej.2022.139510

One-step solvothermal method for the synthesis of highly entropic hydroxymethoxy compounds with lamellar structures. [Display omitted] •A new high entropy metal hydroxymethylate material (FeCoNiMgCr-HM) is synthesized.•A rule for guiding the synthesis of metal hydroxymethylate materials is proposed.•The activated electrocatalyst exhibits an outstanding OER performance. Much attention has been paid to high entropy materials in the field of electrochemical water splitting. In this research, we present a synthesis of a high-entropy metal hydroxymethylate FeCoNiMgCr(OH)(OCH3) (labeled as FeCoNiMgCr-HM) material via a one-step solvothermal method. Due to the synergistic effect of five metal cations and complete surface reconstruction induced by methoxyl group, FeCoNiMgCr-HM after electrochemical activation exhibits an outstanding performance for catalyzing lattice-oxygen-participated OER with a low overpotential of 291 mV to reach a current density of 20 mA cm−2 and a small Tafel slope of 49.1 mV dec-1. In addition, we summarize a universal ionic potential rule for guiding the synthesis of metal hydroxymethylate materials.