School of Chemistry and Chemical Engineering, Shanghai Jiao Tong University , 800 Dongchuan Road, Shanghai 200240, P.R. China.
ACS Appl Mater Interfaces. 2017 Apr 12;9(14):12340-12347. doi: 10.1021/acsami.6b15461. Epub 2017 Apr 3.
A bifunctional electrocatalyst for both oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) is highly attractive for the manufacture of clean energy conversion devices. In this work, highly crumpled hybrid of nitrogen and sulfur dual-doped graphene and quasi-hexagonal CoS nanoplates (CoS/NSG) is fabricated via a facile ionic assembly approach. The unique structure of CoS/NSG renders it high specific surface area (288.3 m g) and large pore volume (1.32 cm g). As the electrocatalyst for ORR, CoS/NSG demonstrates excellent performance with the onset potential of -0.02 V vs Ag/AgCl and the limited current density of 6.05 mA cm at -0.9 V vs Ag/AgCl. CoS/NSG also presents outstanding catalytic activity toward OER by delivering a limited current density of 48 mA cm at 1 V vs Ag/AgCl. The bifunctional catalytic behaviors of CoS/NSG enable the assembly of a rechargeable Zn-air battery with it as the cathode catalyst, which exhibits stable discharge/charge voltage plateaus upon long time cycling over 50 h.
一种用于氧还原反应（ORR）和氧析出反应（OER）的双功能电催化剂对于制造清洁能源转换设备极具吸引力。在这项工作中，通过简便的离子组装方法制备了高度皱缩的氮硫双掺杂石墨烯和类六方 CoS 纳米片的杂化（CoS/NSG）。CoS/NSG 的独特结构使其具有高比表面积（288.3 m g）和大孔体积（1.32 cm g）。作为 ORR 的电催化剂，CoS/NSG 表现出优异的性能，在 -0.9 V 相对于 Ag/AgCl 时起始电位为 -0.02 V，极限电流密度为 6.05 mA cm。CoS/NSG 对 OER 也表现出出色的催化活性，在 1 V 相对于 Ag/AgCl 时极限电流密度为 48 mA cm。CoS/NSG 的双功能催化行为使其能够组装可充电锌空气电池，其作为阴极催化剂在超过 50 h 的长时间循环中表现出稳定的放电/充电电压平台。
