Novel hexagonal Bi2O2CO3 porous nanoplate/nitrogen-doped graphene nanomaterials with enhanced electrochemical properties for oxygen reduction reaction in acidic media for fuel cells

By Qin, Xiulan; Huang, Ying; Wang, Ke; Xu, Tingting; Li, Suping; Zhao, Ming; Wang, Yanli; Chen, Qian
Published in Carbon 2019

Abstract

A template-free method is successfully designed to originally synthesize novel porous Bi2O2CO3 hexagonal nanoplate (PBHN) and the Bi2O2CO3 hexagonal nanoplate/nitrogen-doped graphene nanomaterials (PBHN/NG). Notably, PBHN-2 and PBHN/NG-2 have not yet been reported in previous literatures. For the first time, PBHN/NG-2 as the oxygen reduction reaction (ORR) catalyst has been investigated in detail for cathode of fuel cell. The measurement results show that PBHN/NG-2 has exhibited fascinating ORR performances, duo to its orthogonal-layered porous structures from porous Bi2O2CO3 and NG sheets. The values of onset potential and limiting current density for PBHN/NG-2 are 1.179 V and 7.38 mA cm?2 in 0.1 M HClO4 respectively. The PBHN/NG-2 possess small electrochemical impedance and good methanol immunity in 0.1 M HClO4 media. Remarkably, the relative current density of PBHN/NG-2 in acidic electrolyte can still keep 98.58% of its original density after 18000 s durable measurement. Therefore, the PBHN/NG-2 is a promising ORR catalyst to solve the problems of high costs, sluggish ORR kinetics and low durability, applied in fuel cells, metal-air batteries and other renewable energy devices.

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