1 research outputs found
Nanohybrid of Carbon Quantum Dots/Molybdenum Phosphide Nanoparticle for Efficient Electrochemical Hydrogen Evolution in Alkaline Medium
The
exploration of highly efficient non-noble metal electrocatalysts for
hydrogen evolution reaction (HER) under alkaline conditions is highly
imperative but still remains a great challenge. In this work, the
nanohybrid of carbon quantum dots and molybdenum phosphide nanoparticle (CQDs/MoP)
has been firstly demonstrated as an efficient alkaline HER electrocatalyst.
The CQDs/MoP nanohybrid is readily prepared through a charge-directed
self-assembly of CQDs with phosphomolybdic acid (H<sub>3</sub>PMo<sub>12</sub>O<sub>40</sub>) at the molecular level, followed by facile
phosphatizing at 700 °C. The introduction of CQDs greatly helps
to alleviate the agglomeration and surface oxidation of MoP nanoparticles
and ensures each MoP nanoparticle to be electronically addressed,
thus significantly enhancing the intrinsic catalytic activity of MoP.
The optimized CQDs/MoP exhibits high-efficiency synergistic catalysis
toward HER in 1 M KOH electrolyte with a low onset potential of −0.08
V and a small Tafel slope of 56 mV dec<sup>–1</sup> as well
as high durability with negligible current loss for at least 24 h