화학공학소재연구정보센터
Journal of Colloid and Interface Science, Vol.564, 28-36, 2020
Single-atom Pt supported on holey ultrathin g-C3N4 nanosheets as efficient catalyst for Li-O-2 batteries
As for electrocatalysis, single-atom metal catalysts have been proved to lower the cost and utilize precious metals more efficiently. Herein, single-atom Pt catalyst supported on holey ultrathin g-C3N4 nanosheets (Pt-CNHS) was synthesized via a facile liquid-phase reaction of g-C3N4 and H2PtCl6. The single-atom Pt can achieve high dispersibility and stability, which can promote the utilization efficiency as well as enhance the electrochemical activity. When employed as Li-O-2 batteries' cathode catalyst, Pt-CNHS exhibits excellent electrocatalytic activity. Li-O-2 batteries utilizing Pt-CNHS show much higher discharge specific capacities than those with pure CNHS. Li-O-2 batteries with Pt-CNHS cathode can be cycled stably for 100 times under the discharge capacity of 600 mAh g(-1). Based on experimental results and density functional theory calculations, the superior electrocatalytic activity of Pt-CNHS can be ascribed to the large surface area, the enhanced electrical conductivity and the efficient interfacial mass transfer through Pt atoms and porous structure of CNHS. (C) 2019 Elsevier Inc. All rights reserved.