On-Chip Investigation of Electrocatalytic Oxygen Reduction Reaction of 2D Materials

作者：Qi, Junlei; Wang, Wenbin; Li, Yihan; Sun, Yamei; Wu, Zongxiao; Bao, Kai; Wang, Lingzhi; Ye, Ruquan; Ding, Mengning^*; He, Qiyuan^*

来源：Small, 2022, 18(47).

DOI：10.1002/smll.202204010

• 2D materials
• microelectrodes
• microfluidics
• on-chip electrochemistry
• oxygen reduction reaction

The on-chip electrocatalytic microdevice (OCEM) is an emerging platform specialized in the electrochemical investigation of single-entity nanomaterials, which is ideal for probing the intrinsic catalytic properties, optimizing performance, and exploring exotic mechanisms. However, the current catalytic applications of OCEMs are almost exclusively in electrocatalytic hydrogen/oxygen evolution reactions with minimized influence from the mass transfer. Here, an OCEM platform specially tailored to investigate the electrocatalytic oxygen reduction reaction (ORR) at a microscopic level by introducing electrolyte convection through a microfluidic flow cell is reported. The setup is established on gold microelectrodes and later successfully applied to investigate how Ar-plasma treatment affects the ORR activities of 2H MoS2. This study finds that Ar-plasma treatment significantly enhances the ORR performance of MoS2 nanosheets owing to the introduction of surface defects. This study paves the way for highly efficient microscopic investigation of diffusion-controlled electrocatalytic reactions.

• 单位
  北京航空航天大学; 南京大学