Low-temperature synthesized amorphous quasi-high-entropy carbonate electrocatalyst with superior surface self-optimization for efficient water oxidation. Issue 8 (15th April 2023)

• Record Type: Journal Article
• Authors: Lu, Chao; Li, Mingming; Zhang, Xinghe; Hou, Hongbo; Li, Xiaojiao; Yang, Xiaona; Liu, Xiaonan; Ding, Yi; Hou, Jinchi; Wang, Yujie
• Is Part Of: Ceramics international. Volume 49:Issue 8(2023)
• Page Start: 12156
• Page End: 12165
• Publication Date: 2023-04-15
• Subjects: High-entropy carbonate -- Amorphous -- High-valence ferritic species -- Electrocatalyst -- Water oxidation; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2022.12.067
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: Anionic High-entropy materials have seldom been reported as a new library of water oxidation electrocatalysts owing to great difficulty in uniformly distributing multiple elements with different physicochemical properties and harsh synthesis conditions. Herein, a series of amorphous quasi-high-entropy carbonates for the first time is prepared via a facile low-temperature hydrothermal route. The optimized CoCrFeMnMoCO3 with hydrothermal treatment of 6 h can serve as a promising oxygen evolution reaction (OER) electrocatalyst for water splitting on account of amorphous structure rendering more exposed active sites, superior synergistic effect realizing surface component self-optimization, high-valence ferritic species (Fe (3+δ)+ ) providing high catalytic activity and high-entropy stabilization guaranteeing long-term OER performance, thus exhibiting the low overpotentials of 302 and 355 mV at the current densities of 10 and 100 mA cm −2, respectively, the small Tafel slope of 36.7 mV dec −1, and excellent durability longer than 38 h, dramatically exceeding its corresponding crystalline counterpart and benchmark RuO2 catalyst, as well as yielding the current density of 10 mA cm −2 with impressive low voltage of 1.56 V while used as bifunctional electrocatalyst for overall water splitting. This study lights a broad avenue to design other anionic high-entropy materials as promising OER catalysts.