Cooperative effect of bimetallic MOF-derived CoNi(OH)2@NiCo2S4 nanocomposite electrocatalysts with boosted oxygen evolution activity. (25th June 2022)

• Record Type: Journal Article
• Authors: Zheng, Lingxia; Wang, Shibin; Wang, Yongzhi; Zhao, Zhefei; Yang, Pengju; Song, Jianlan; Shi, Xiaowei; Zheng, Huajun
• Is Part Of: Nanotechnology. Volume 33:Number 26(2022)
• Publication Date: 2022-06-25
• Subjects: bimetallic hydroxide -- bimetallic sulfide -- MOF derived nanocomposite -- synergy effect -- oxygen evolution reaction; Nanotechnology -- Periodicals; Nanotechnology -- Periodicals; Nanotechnology; Publications périodiques; Nanotechnologies; Periodicals; 620.5
• DOI: 10.1088/1361-6528/ac5f99
• Languages: English
• ISSNs: 0957-4484

Abstract

Abstract: Highly efficient and inexpensive electrocatalysts for oxygen evolution reaction (OER) are extensively studied for water splitting. Herein, a unique bimetallic nanocomposite CoNi(OH)2 @NiCo2 S4 nanosheet arrays derived from metal-organic-frameworks (MOFs, CoNi-ZIF) is simply fabricated on Ni foam, endowing large specific surface area and outstanding electrical conductivity. Compared with their single-metallic counterparts, the bimetallic composite displays dramatically low overpotential and small Tafel slope as well as outstanding catalytic stability. The overpoptential at 20 mA cm −2 for CoNi(OH)2 @NiCo2 S4 is only 230 mV in comparison with Ni(OH)2 @Ni3 S2 (266 mV), Co(OH)2 @Co3 S4 (294 mV) and RuO2 ( η = 302 mV). First-principle calculations based on density functional theory (DFT) are carried out and reveal that the introduction of Ni in Co(OH)2 helps lowered the energy difference of Δ G OOH* –Δ G O*, and thereby boosting the OER reactivity. This study provides an effective approach for the rational construction of low-cost metal hybrids.