Abstract
A molecular catalyst containing earth-abundant, low-cost cobalt was integrated with α-Fe2O3 film electrode for photoelectrochemical water oxidation. Under illumination of LED (λ = 420 nm), the hybrid photoanode exhibits a 7-fold enhancement in photocurrent density relative to bare α-Fe2O3 in 0.1 M Na2SO4 at pH 7. Accompanied by the highly stable photocurrent, stoichiometric oxygen and hydrogen are generated with a faraday efficiency over 85% respectively for 4 h photolysis. With hydrogen peroxide (H2O2) serving as the hole scavenger, it demonstrated that integration with molecular catalyst can greatly prompt hole diffusion length of α-Fe2O3 and improve its charge transfer properties. Mechanistic study and stability test supports that highly efficient and stable molecular catalyst plays the crucial role in charge separation, which successfully inhibits electron-hole recombination, achieving great enhancement in photocurrent. Therefore, to assemble into a highly active semiconductor-molecule heterojunction for solar fuel generation, the core relies on an available strategy to design the robust, stable and practical catalytic center.
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