Metal-Organic Framework-Derived Hierarchical (Co,Ni)Se 2 @NiFe LDH Hollow Nanocages for Enhanced Oxygen Evolution

• Published in: ACS applied materials & interfaces Vol. 11; no. 8; pp. 8106 - 8114
• Main Authors: Li, Jian-Gang, Sun, Huachuan, Lv, Lin, Li, Zhishan, Ao, Xiang, Xu, Chenhui, Li, Yi, Wang, Chundong
• Format: Journal Article
• Language: English
• Published: United States 27.02.2019
• Subjects: oxygen evolution reaction; (Ni,Co)Se2; heterostructure; ZIF-67; NiFe layered double hydroxide
• ISSN: 1944-8244; 1944-8252
• DOI: 10.1021/acsami.8b22133

High-efficient electrocatalysts are crucial for fuel cell applications; however, the whole cell performance is generally restricted by the anodic part because of the sluggish kinetics involved in the oxygen evolution reaction (OER) process. Herein, a hierarchical hollow (Co,Ni)Se @NiFe layered double hydroxide (LDH) nanocage was synthesized by deriving from the metal-organic framework (MOF) of ZIF-67. Concretely, it involves first fabrication of hollow rhombic (Co,Ni)Se nanocages and then deposition of NiFe LDH nanosheets on the surface of nanocages. Notably, the incorporation of Ni into Co-based ZIF-67 (via ion-exchange) could tail the atomic arrangement of the MOF, exposing more additional active sites in the following selenization treatment. The as-synthesized (Co,Ni)Se @NiFe LDH demonstrates splendid OER performance with a small overpotential of 277 mV (to launch a current density of 10 mA cm ), a small Tafel slope of 75 mV dec , and robust durability (a slight stability decay of 5.1% after 17 h of continuous test), not only surpassing the commercial RuO but also being comparable/superior to most reported nonprevious metal-based catalysts. Upon analysis, the outstanding OER performance is attributed to the optimized adsorption/desorption nature of iron and nickel/cobalt toward the oxygenated species and partial delocalization of spin status at the interface via the bridging O . This work represents a solid step toward exploration of advanced catalysts with deliberate experimental design and/or atom tailoring.