Abstract
A novel deoxyribose nucleic acid (DNA)-based photoelectrode consisting of DNA@Mn3(PO4)2 nanoparticles on graphene oxide (GO) sheets was successfully fabricated for photoelectrocatalysis. DNA served as a soft template to guide the nucleation and growth of Mn3(PO4)2 nanoparticles in the synthesis of Mn3(PO4)2 nanoparticles. More importantly, the DNA also serves as semiconductor materials to adjust charge transport. Under UV light irradiation (180–420 nm, 15 mW/cm2), the photocurrent density of DNA@ Mn3(PO4)2/GO electrodes reached 9 μA/cm2 at 0.7 V bias (vs. SCE). An applied bias photon-to-current efficiency (ABPE) of ~0.18% can be achieved, which was much higher than that of other control electrodes (<0.04%). In this DNA-based photoelectrode, well-matched energy levels can efficiently improve charge transfer and reduce the recombination of photogenerated electron-hole pairs.
Highlights
Energy crisis and environmental issue at global level are important topics and force us to search renewable clean energy [1]
Unique Morphology and Properties of deoxyribose nucleic acid (DNA)@Mn3(PO4)2/graphene oxide (GO) The synthesis processes of DNA@ Mn3(PO4)2 nanocomposite and DNA@ Mn3(PO4)2/GO electrode are schematically shown in Scheme 1
Assembling of DNA@ Mn3(PO4)2 nanoparticles onto GO nanosheets was achieved by π-π non-covalent conjugation and electrostatic interaction between the base pairs of DNA and the functionalized surface of GO nanosheets
Summary
Energy crisis and environmental issue at global level are important topics and force us to search renewable clean energy [1]. Non-polluting, abundant, and endlessly renewable source of clean energy. Among the technologies for converting sunlight, photoelectrocatalysis combined the concepts of photovoltaics and wet-chemical photosynthesis has the ability to split water through solar energy to produce hydrogen [2]. Phosphate can accelerate photoelectrochemical reactions and Li et al reported cobalt phosphate as an oxygen evolution co-catalyst and used as a potential photoelectrocatalyst for efficient solar water splitting [10, 11]. Manganese phosphate, (Mn3(PO4), as one of phosphates has been used as cathode material for lithium ion battery [12], a water oxidation catalyst [13]
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