Citation:
	            
		            Kai Huang,  Shuai Guo,  Ruyue Wang,  Sen Lin,  Naveed Hussain,  Hehe Wei,  Bohan Deng,  Yuanzheng Long,  Ming Lei,  Haolin Tang,  Hui Wu. Two-dimensional MOF/MOF derivative arrays on nickel foam as efficient bifunctional coupled oxygen electrodes[J]. Chinese Journal of Catalysis,
							;2020, 41(11): 1754-1760.
						
							doi:
								10.1016/S1872-2067(20)63613-0
						
					
				
					
				
	        
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	                	Oxygen electrocatalysis, exemplified by the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER), is central to energy storage and conversion technologies such as fuel cells, metal-air batteries, and water electrolysis. However, highly effective and inexpensive earth-abundant materials are sought after to replace the noble metal-based electrocatalysts currently in use. Recently, metal-organic frameworks (MOFs) and carbon-based MOF derivatives have attracted considerable attention as efficient catalysts due to their exceedingly tunable morphologies, structures, compositions, and functionalization. Here, we report two-dimensional (2D) MOF/MOF derivative coupled arrays on nickel foam as binder-free bifunctional ORR/OER catalysts with enhanced electrocatalytic activity and stability. Their remarkable electrochemical properties are primarily attributed to fully exposed active sites and facilitated charge-transfer kinetics. The coupled and hierarchical nanosheet arrays produced via our growth-pyrolysis-regrowth strategy offer promise in the development of highly active electrodes for energy-related electrochemical devices.
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								Keywords:
								
 - 2D MOFs,
 - Derivative,
 - Coupled arrays,
 - Binder-free,
 - Oxygen electrode
 
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