Interconnected
Hollow Cobalt Phosphide Grown on Carbon
Nanotubes for Hydrogen Evolution Reaction
Alaaldin Adam
Munzir H. Suliman
Mohammad N. Siddiqui
Zain H. Yamani
Belabbes Merzougui
Mohammad Qamar
10.1021/acsami.8b03427.s001
https://acs.figshare.com/articles/journal_contribution/Interconnected_Hollow_Cobalt_Phosphide_Grown_on_Carbon_Nanotubes_for_Hydrogen_Evolution_Reaction/7010279
Transition-metal
phosphides are deemed as potential alternative
to platinum for large-scale and sustainable electrocatalytic hydrogen
production from water. In this study, facile preparation of interconnected
hollow cobalt monophosphide (CoP) supported on carbon nanotubes is
demonstrated and evaluated as a low-cost electrocatalyst for hydrogen
evolution reaction. Hexamethylenetetramine is used as a structure-directing
agent to guide the formation of interconnected cobalt oxide, which
further grows into interconnected hollow CoP. Interconnected and hollow
microstructural artifacts impart benign attributes, such as enhanced
specific and electrochemically active surface area, low intrinsic
charge transfer resistance, high interfacial charge transfer kinetics,
and improved mass transport, to the electrocatalyst. As a result,
the as-prepared electrode exhibits remarkable electrocatalytic performance,
low onset (18 mV) and overpotential (η<sub>10</sub> = 73 mV);
small Tafel slope (54.6 mV dec<sup>–1</sup>); and high turnover
frequency (0.58 s<sup>–1</sup> at η = 73 mV). In addition,
the electrode shows excellent electrochemical stability.
2018-08-13 00:00:00
surface area
electrochemical stability
Hydrogen Evolution Reaction Transition-metal phosphides
mass transport
cobalt monophosphide
hydrogen evolution reaction
carbon nanotubes
electrocatalyst
structure-directing agent
charge transfer kinetics
Carbon Nanotubes
73 mV
electrocatalytic performance
electrocatalytic hydrogen production
Interconnected Hollow Cobalt Phosphide Grown
microstructural artifacts
CoP
cobalt oxide
as-prepared electrode exhibits
charge transfer resistance