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Interconnected Hollow Cobalt Phosphide Grown on Carbon Nanotubes for Hydrogen Evolution Reaction
journal contribution
posted on 2018-08-13, 00:00 authored by Alaaldin Adam, Munzir H. Suliman, Mohammad N. Siddiqui, Zain H. Yamani, Belabbes Merzougui, Mohammad QamarTransition-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 (η10 = 73 mV);
small Tafel slope (54.6 mV dec–1); and high turnover
frequency (0.58 s–1 at η = 73 mV). In addition,
the electrode shows excellent electrochemical stability.
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surface areaelectrochemical stabilityHydrogen Evolution Reaction Transition-metal phosphidesmass transportcobalt monophosphidehydrogen evolution reactioncarbon nanotubeselectrocatalyststructure-directing agentcharge transfer kineticsCarbon Nanotubes73 mVelectrocatalytic performanceelectrocatalytic hydrogen productionInterconnected Hollow Cobalt Phosphide Grownmicrostructural artifactsCoPcobalt oxideas-prepared electrode exhibitscharge transfer resistance
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