A hierarchical CoMoO4@CoFe-LDH heterostructure as a highly effective catalyst to boost electrocatalytic water oxidation. Issue 27 (30th June 2022)

• Record Type: Journal Article
• Authors: Tian, Liang; Wang, Qiangqiang; Li, Yuyang; Ren, Xiang; Wei, Qin; Wu, Dan
• Is Part Of: Dalton transactions. Volume 51:Issue 27(2022)
• Page Start: 10552
• Page End: 10557
• Publication Date: 2022-06-30
• Subjects: Chemistry, Inorganic -- Periodicals; Chemistry, Physical and theoretical -- Periodicals; Chemistry, Inorganic -- Periodicals; 546.05
• DOI: 10.1039/d2dt01257j
• Languages: English
• ISSNs: 1477-9226

Abstract

Abstract : A hierarchical CoMoO4 @CoFe-LDH/NF heterostructure is constructed as an efficient catalyst for the oxygen evolution reaction. In alkaline solution, it only needs 245 mV to drive the process at 10 mA cm −2 and long-term stability for 47 h. Abstract : The oxygen evolution reaction (OER) has become the main barrier to electrochemical water splitting, owing to sluggish kinetics. To accelerate the OER process, a nature-abundant non-noble metal catalyst with outstanding catalytic activity is required. Here, a hierarchical CoMoO4 @CoFe layered double hydroxide (LDH, denoted by CoMoO4 @CoFe/NF) heterostructure supported on three-dimensional (3D) nickel foam (NF) was synthesised by electrodepositing CoFe-LDH nanosheets on the surface of CoMoO4 nanoplates to boost the electrocatalytic performance for the OER. The coupling between CoMoO4 and CoFe-LDH established abundant boundaries, which exposed abundant active sites. Furthermore, the electron transfer in the hierarchical heterostructure effectively promoted the adsorption and dissociation of H2 O molecules. Harnessing the aforementioned synergistic effect significantly improved the intrinsic reaction kinetics of the OER. At 10 mA cm −2, CoMoO4 @CoFe/NF reached a small overpotential of 245 mV at room temperature and exhibited outstanding stability for at least 47 h. Furthermore, the Tafel slope for CoMoO4 @CoFe/NF was only 46 mV dec −1 . This study provides new ideas for the rational design of hierarchical structures and the use of interface interactions.