Atomically Dispersed Zincophilic Sites in N,P-Codoped Carbon Macroporous Fibers Enable Efficient Zn Metal Anodes

摘要

Zn dendrite growth and undesired parasitic reactionsseverely restrictthe practical use of deep-cycling Zn metal anodes (ZMAs). Herein,we demonstrate an elaborate design of atomically dispersed Cu andZn sites anchored on N,P-codoped carbon macroporous fibers (denotedas Cu/Zn-N/P-CMFs) as a three-dimensional (3D) versatile host forefficient ZMAs in mildly acidic electrolyte. The 3D macroporous frameworkscan alleviate the structural stress and suppress Zn dendrite growthby spatially homogenizing Zn2+ flux. Moreover, the well-dispersedCu and Zn atoms anchored by N and P atoms maximize the utilizationas abundant active nucleation sites for Zn plating. As expected, theCu/Zn-N/P-CMFs host presents a low Zn nucleation overpotential, highreversibility, and dendrite-free Zn deposition. The Cu/Zn-N/P-CMFs-Znelectrode exhibits stable Zn plating/stripping with low polarizationfor 630 h at 2 mA cm(-2) and 2 mAh cm(-2). When coupled with a MnO2 cathode, the fabricated fullcell also shows impressive cycling performance even when tested underharsh conditions.

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