Synthesis of Co2P nanoparticles decorated nitrogen, phosphorus Co-doped Carbon-CeO2 composites for highly efficient oxygen reduction

Publication date: 15 September 2019Source: Journal of Alloys and Compounds, Volume 801Author(s): Xiaoqing Wang, Jijian Xu, Mingjia Zhi, Zhanglian Hong, Fuqiang HuangAbstractThe oxygen reduction reaction is an important cathode reaction, thus seeking for low cost and high activity catalysts is highly demanded. Herein, a ternary catalyst composed of Co2P nanoparticles, N and P co-doped carbon (NPC) and CeO2 nanosheets (Co2P-NPC-CeO2) is reported for efficient oxygen reduction. In such composite, CeO2 nanosheets are coated with a carbon layer derived from dopamine, and then decorated with Co2P nanoparticles by using phytic acid as the phosphorus source. High ORR catalytic activity was achieved in the optimized sample with a high onset potential of 880 mV (vs RHE), a positive half-wave potential of 827 mV (vs RHE), a diffusion limited current density of 5.24 mA cm−2, and a good durability (the half-wave potential exhibited almost 0 mV after 1000 cycles). Together with the good durability and methanol tolerance, the composite catalyst demonstrated here can be potentially applied in energy conversion devices.Graphical abstractA simple ‘one-pot’ and ‘one-step’ method was applied to prepare the ternary catalyst Co2P-NPC-CeO2, and it exhibited excellent ORR performances, which can match with the commercial Pt/C.

Source: Journal of Alloys and Compounds - June 17, 2019 Category: Chemistry Source Type: research