Assembling Metal Organic Layer Composites for High‐Performance Electrocatalytic CO2 Reduction to Formate. Issue 9 (17th January 2022)

• Record Type: Journal Article
• Authors: Liu, Hang; Wang, Hongguang; Song, Qian; Küster, Kathrin; Starke, Ulrich; van Aken, Peter A.; Klemm, Elias
• Is Part Of: Angewandte Chemie international edition. Volume 61:Issue 9(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2022-01-17
• Subjects: 2D Composites -- CO2 -- Electroreduction -- Electron microscopy -- MOFs; Chemistry -- Periodicals; 540
• DOI: 10.1002/anie.202117058
• Languages: English
• ISSNs: 1433-7851

Abstract

Abstract: 2D metal–organic‐framework (MOF) based composites have emerged as promising candidates for electrocatalysis due to their high structural flexibility and fully exposed active sites. Herein, a freestanding metal–organic layer (MOL) with a 2D kgd (kagome dual) lattice was constructed with abundant surface oxygenate groups serving as anchoring sites to immobilize diverse guests. Taking Bi as an example, tetragonal Bi2 O3 nanowires can be uniformly grown on MOLs after solvothermal treatment, the structural evolution of which was followed by ex situ electron microscopy. The as‐prepared Bi2 O3 /MOL exhibits excellent CO2 electroreduction activity towards formate reaching a specific current of 2.3 A mgBi −1 and Faradaic efficiencies of over 85 % with a wide potential range from −0.87 to −1.17 V, far surpassing Bi2 O3 /UiO (a 3D Zr6 ‐oxo based MOF) and Bi2 O3 /AB (Acetylene Black). Such a post‐synthetic modification strategy can be flexibly extended to develop versatile MOL composites, highlighting the superiority of optimizing MOL‐based composites for electrocatalysis. Abstract : To avoid the poor conductivity of most pristine metal–organic frameworks, a free‐standing metal–organic layer (MOL) was exploited to construct diverse composites by a facile post‐synthetic strategy. The structural superiority of the MOLs composites contributes to the excellent and durable performance of electrocatalytic CO2 reduction into formate.