Abstract
In recent years,photoelectrochemical(PEC)water splitting to produce hydrogen provides a clean and renewable pathway for future energy demands.hematite(α-Fe2O3)is a promising photoanode material owing to its narrow band gap(~2.1 eV),non-toxicity,natural abundance,and photo-stability.However,some drawbacks greatly limited the photoconversion efficiencies of Fe2O3-based photoanodes,such as poor electrical conductivity,short hole diffusion length(2~4 nm),sluggish surface oxygen evolution kinetics,and short excited-state lifetime(<10×10^-12 sec).Here,we review the recent progressof hematite photoanodes for PEC water oxidation,focused on enhancing surface water oxidation reaction,accelerating charge separation and transport in bulk,improving light absorption.Finally,perspectives on the key challenges and future development of hematite photoelectrodes for PEC water splitting are given.
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