Abstract
The surface and interface configuration of catalysts has been considered as a useful strategy to achieve high oxygen reduction and oxygen evolution reaction activities for Li-O2 batteries. Herein, the facile synchronous reduction method and screen-printing process are applied to obtain an Ru-rGO catalyst with a 3D porous architecture and oxygen electrodes. Significantly, an ultra-long cycling Li-O2 cell is designed using catalytic membrane decoration. The catalytic membrane is fabricated via electrospinning polyacrylonitrile (PAN) nanofibers directly onto a separator. Then, Ag nanowires and Au nanoparticles are coated on previously obtained PAN scaffolds. After comparing initial Ru-rGO electrode with decorated Ru-rGO (D-Ru-rGO), we infer that the cell with D-Ru-rGO catalyst exhibits enhanced cycling performance towards ORR and OER, higher specific discharge capacity (13 437.8 mA h g−1), extended cycling stability, desirable rate performance, and a lower voltage gap. The insulating PAN polymer framework can directly restrict electron transfer to the Ag/Au catalyst and effectively prevent Ag/Au catalytic sites from direct blockage. Thus, the efficient and effective method proposed in this study offers a new insight into architecture designing and synergetic surface/interface strategy settling.
Original language | English |
---|---|
Journal | Journal of Materials Chemistry A |
Volume | 6 |
Issue number | 43 |
Pages (from-to) | 21458-21467 |
Number of pages | 10 |
ISSN | 2050-7488 |
DOIs | |
Publication status | Published - 1 Jan 2018 |
Externally published | Yes |