Controllable Urchin‐Like NiCo2S4 Microsphere Synergized with Sulfur‐Doped Graphene as Bifunctional Catalyst for Superior Rechargeable Zn–Air Battery

• DOI: 10.1002/adfm.201706675
• Publication Date: 2018-01-18T11:07:09Z
• Authors: Wenwen Liu; Jing Zhang; Zhengyu Bai; Gaopeng Jiang; Matthew Li; Kun Feng; Lin Yang; Yuanli Ding; Tongwen Yu; Zhongwei Chen; Aiping Yu
• Keywords: Overpotential; Bifunctional catalyst; Oxygen evolution

Abstract Rechargeable zinc–air batteries (ZnABs) are attracting great interest due to their high theoretical specific energy, safety, and economic viability. However, performance large‐scale practical applications largely limited by poor durability overpotential on the air‐cathode slow kinetics of oxygen reduction evolution reactions (ORR/OER). Therefore, it is highly desired exploit an ideal bifunctional catalyst endow obtained ZnABs with excellent ORR/OER catalytic performances. Herein, a new nonprecious‐metal urchin‐like NiCo 2 S 4 microsphere synergized sulfur‐doped graphene nanosheets (S‐GNS/NiCo ) controllably designed synthesized simply tailoring structure electronic arrangement, which as‐prepared electroactivity long‐term toward ORR OER. Importantly, constructed this outstanding exhibit power density, small charge/discharge voltage gap, cycle stability, notably outperforming more costly commercial Pt/C + Ir/C mixture catalyst. These electrocatalytic performances together simplicity synthetic method, make microsphere/S‐GNS hybrid nanostructure promise as superior for high‐performance rechargeable ZnABs.