CoP nanosheet assembly grown on carbon cloth: A highly efficient electrocatalyst for hydrogen generation
Hedhili, Mohamed N.
KAUST DepartmentAdvanced Membranes and Porous Materials Research Center
Chemical Science Program
Homogeneous Catalysis Laboratory (HCL)
Imaging and Characterization Core Lab
KAUST Catalysis Center (KCC)
Material Science and Engineering Program
Nanostructured Functional Materials (NFM) laboratory
Physical Science and Engineering (PSE) Division
Permanent link to this recordhttp://hdl.handle.net/10754/564191
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AbstractThere exists a strong demand to replace expensive noble metal catalysts with cheap metal sulfides or phosphides for hydrogen evolution reaction (HER). Recently metal phosphides such as NixP, FeP and CoP have been considered as promising candidates to replace Pt cathodes. Here we report that the nanocrystalline CoP nanosheet assembly on carbon cloth can be formed by a two-step process: electrochemical deposition of Co species followed by gas phase phosphidation. The CoP catalyst in this report exhibits a Tafel slope of 30.1mV/dec in 0.5M H2SO4 and 42.6mV/dec in 1M KOH. The high HER performance of our CoP catalysts is attributed to the rugae-like morphology which results in a high double-layer capacitance and high density of active sites, estimated as 7.77×1017sites/cm2. © 2015 Elsevier Ltd.