Add time:07/17/2019         Source:sciencedirect.com

Efficient catalytic electro-oxidation of methanol or UREA (cas 506-89-8) is critical to the development of fuel cells, which have attracted considerable interest due to their high energy conversion efficiency, ease of operation and low pollutant emission. In this work, nickel cobalt phosphate (NiCoPO) with different Ni/Co ratio are successfully fabricated by co-precipitation method. The electronic states and texture properties of the active Ni(III) species can be regulated by the introduced Co phosphate. The cobalt introduction effectively reduced the onset potential and increased the oxidation current. Compared with nickel phosphate (NiPO), the onset potential of NiCoPO (4:6) and NiCoPO (6:4) decreased by 135 and 132 mV in urea and methanol electro-oxidation process, respectively. The amperometric i-t curves show that the current densities of NiCoPO electrodes are significantly higher than that of NiPO and CoPO. The NiCoPO (4: 6) and (5: 5) exhibits the highest current of urea and methanol oxidation, respectively. This work provides a research reference about the cobalt doping effect for nickel phosphate as catalysts in electro-oxidation reaction.

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