Abstract
The development of a physical factor to correlate the experimental methods and catalytic activity of catalysts is quite important for the design of highly-efficient catalysts. In this work, with the aid of our pre-designed correlation factor of d electron density, a new oxygen evolution reaction electrocatalyst of FeCoPO4 was designed on account of the higher electronegativity of Co atom than Fe atom. The foreign Co atom would enhance the combining capacities of the neighbouring Fe-O bonds, increase the d electron density and reduce the chemical activity of host Fe ions, and thus improve the catalytic activity of Fe based active centers. Based on the theoretical guidance, the prepared FeCoPO4 specimen exhibited low ηexp of 241 mV, fast charge transfer rate, high intrinsic activity and stable electrocatalytic activity. This strategy would be adopted to design highly-efficient catalyst by altering the d electron density of transition metal ions with suitable preparation methods.
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