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

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

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 (HER). 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, as-prepared electrode exhibits remarkable electrocatalytic performance - low onset (18 mV) and overpotential (n10 = 73 mV), small Tafel slope (54.6 mVdec-1), and high turnover frequency (0.58 s-1 at n = 73 mV). In addition, the electrode shows excellent electrochemical stability.

Original languageEnglish
JournalACS Applied Materials and Interfaces
DOIs
Publication statusAccepted/In press - 1 Jan 2018

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Carbon Nanotubes
Electrocatalysts
Cobalt
Charge transfer
Hydrogen
Carbon nanotubes
Methenamine
Electrodes
Hydrogen production
Platinum
Transition metals
Mass transfer
Kinetics
Water
Costs
Oxides
cobalt oxide

ASJC Scopus subject areas

  • Materials Science(all)

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Interconnected Hollow Cobalt Phosphide Grown on Carbon Nanotubes for Hydrogen Evolution Reaction. / Adam, Alaaldin; Suliman, Munzir H.; Siddiqui, Mohammad N.; Yamani, Zain H.; Merzougui, Belabbes; Qamar, Mohammad.

In: ACS Applied Materials and Interfaces, 01.01.2018.

Research output: Contribution to journalArticle

Adam, Alaaldin ; Suliman, Munzir H. ; Siddiqui, Mohammad N. ; Yamani, Zain H. ; Merzougui, Belabbes ; Qamar, Mohammad. / Interconnected Hollow Cobalt Phosphide Grown on Carbon Nanotubes for Hydrogen Evolution Reaction. In: ACS Applied Materials and Interfaces. 2018.
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