Journal
NANOMATERIALS
Volume 12, Issue 22, Pages -Publisher
MDPI
DOI: 10.3390/nano12224069
Keywords
Zn-air batteries; 2D MoS2; defects-embedded; OER; ORR
Categories
Funding
- NSFC [61921005, 62104099, 62105048, 61735008, 11774155, 62004078]
- Natural Science Foundation of Jiangsu province [BK20190313, BK20201073]
- Key Scientific Research Project in Colleges and Universities of Henan Province of China [21A416001]
- Open project of Nanjing University Solid State Microstructure Laboratory [M34057, M35033, M35062, M35059]
- National Key R&D Program of China [2018YFB2200101]
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This study reports a stable rechargeable aqueous zinc-air battery using a heterogeneous two-dimensional molybdenum sulfide cathode catalyst. The catalyst shows decent oxygen evolution and acceptable oxygen reduction catalytic activity compared to commercial ones.
Aqueous rechargeable zinc (Zn)-air batteries have recently attracted extensive research interest due to their low cost, environmental benignity, safety, and high energy density. However, the sluggish kinetics of oxygen (O-2) evolution reaction (OER) and the oxygen reduction reaction (ORR) of cathode catalysts in the batteries result in the high over-potential that impedes the practical application of Zn-air batteries. Here, we report a stable rechargeable aqueous Zn-air battery by use of a heterogeneous two-dimensional molybdenum sulfide (2D MoS2) cathode catalyst that consists of a heterogeneous interface and defects-embedded active edge sites. Compared to commercial Pt/C-RuO2, the low cost MoS2 cathode catalyst shows decent oxygen evolution and acceptable oxygen reduction catalytic activity. The assembled aqueous Zn-air battery using hybrid MoS2 catalysts demonstrates a specific capacity of 330 mAh g(-1) and a durability of 500 cycles (similar to 180 h) at 0.5 mA cm(-2). In particular, the hybrid MoS2 catalysts outperform commercial Pt/C in the practically meaningful high-current region (>5 mA cm(-2)). This work paves the way for research on improving the performance of aqueous Zn-air batteries by constructing their own heterogeneous surfaces or interfaces instead of constructing bifunctional catalysts by compounding other materials.
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