Stable composite of flower-like NiFe-layered double hydroxide nucleated on graphene oxide as an effective catalyst for oxygen reduction reaction

Nowadays, it is an urgent need but challenging to develop an efficient and resource-rich electrocatalysts with electrocatalysts activity for the oxygen reduction reaction (ORR) electrocatalyst. Therefore, we rationally designed and synthesized a unique 3-dimensional (3D) structure of flower-like NiFe-layered double hydroxide (NiFe-LDH) growing on graphene oxide (GO) with large surface area, widely-exposed active sites and good electrical conductivity, of which the weight percentage of GO in NiFe-LDH/GO was about 27.37%. Consequently, compared with pure NiFe-LDH (0.71 V (vs RHE), 95 mV dec(-1)) in alkaline electrolyte, the NiFe-LDH/GO possesses a relatively high onset potential of 0.88 V (vs RHE) and a smaller Tafel slope of 82 mV dec(-1). Impressively, the prepared optimized NiFe-LDH/GO presents a highly stability than commercial Pt/C after stability testing due to strong interaction between graphene oxide and LDHs. In view of the above properties, these composite materials have better research prospects and open up a new opportunity for rational design. (C) 2019 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.