Abstract
Design and synthesis of hierarchical electrocatalysts with abundant active sites is an effective approach to improve electrocatalytic activity for methanol oxidation. Hierarchical LDH-MOF derived NiCo-bimetallic phosphide (NiCo-MOF-P) has been tested for methanol oxidation reaction (MOR) in alkaline solution. Electrodeposited NiCo-LDH gives extra chemical and structural stability for MOF to avoid accumulation. Obtained LDH-MOF hybrid composite was further surface functionalized by selective phosphorization to enhance electrocatalytic activity by generating more active sites. The NiCo-MOF-P electrocatalyst showed current density 170 mA cm-2 at scan rate of 10 mV s-1 with remarkable long term stability in 0.5 M methanol in 1 M KOH at 1.54 V. The high electrocatalytic activity of NiCo-MOF-P electrocatalyst towards methanol oxidation is mainly associated with synergistic effect of bimetallic element (Ni and Co), high surface area and facilitated charge-transfer due to binder free growth on Ni foam.
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