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Abstract
In this paper, Co nanorods with extremely high length to diameter and preferred exposed (101) facet were synthesized by carboxyl-assisted over graphite oxide surface. DFT calculation results indicated that (101) facet Co nanorods exhibited higher surface energy of (101) facets (2.61J/m2) than that of (100) planes nanorods (2.46J/m2). Such Co nanorods showed very low over-potential for proton reduction, about 0.20V onset overpotential and 400 and 510mV at current densities of 2 and 5mA/cm2, and worked as high active co-catalyst for photocatalytic hydrogen evolution. Co (101) nanorods loaded catalyst generated 891.3μmol H2 in 2h, while Co nanoparticles only gave 451.6μmol of hydrogen during same time. The apparent quantum efficiency (AQE) of Co nanorods catalyst achieved 17.4% at 520nm. This work opened a news strategy for design of with rodlike structure cocatalyst with preferred exposed high surface energy facet for photocatalytic hydrogen evolution reaction though the carboxylation of GO.
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