Morphology-controlled α-Fe2O3 nanostructures on FTO substrates for photoelectrochemical water oxidation

An Integrating Photoanode of WO3/Fe2O3 Heterojunction Decorated with NiFe-LDH to Improve PEC Water Splitting Efficiency

“…However, a single metal oxide semiconductor can generally not meet the requirement of PEC water splitting. Many strategies have been attempted, such as heterojunction constructing, morphology controlling, doping, and incorporating of oxygen evolution cocatalysts . These trial results demonstrate that structuring heterostructure by introducing a second semiconductor with matching band gaps is a good strategy. , Mao et al reported the α-Fe 2 O 3 modified WO 3 heterojunctions for PEC water splitting, and the obtained composite showed visible light harvesting and reached the highest photocurrent density of 0.91 mA/cm 2 that is 9 times of pure WO 3 in sodium sulfate electrolyte .…”

“…PEC water splitting of solar energy has widely been recognized as an effective pathway to resolve both above-mentioned. , The key is to explore and investigate the visible light driving photoelectrode materials. The narrow band gap semiconductors such as WO 3 (∼2.7 eV), BiVO 4 (2.4 eV), and α-Fe 2 O 3 (∼2.2 eV) as the photoanode materials have received a lot of attention. , The α-Fe 2 O 3 is a suitable photoanode material for PEC water oxidation due to response to visible light, nontoxic, abundance, and good PEC stability in water and electrolyte. , However, the single α-Fe 2 O 3 is a poor conductor with a short holes diffusion length (2–4 nm), thus α-Fe 2 O 3 is easy to suffer recombination of electron–hole pairs in the bulk and poor surface reaction dynamics. − Tungsten trioxide (WO 3 ), similar to α-Fe 2 O 3 , has caused wide attention as a photoanode material for PEC water splitting, which is attributed to sufficiently positive VB position than the water oxidation potential, a longer holes diffusion length than α-Fe 2 O 3 , high electron mobility, and low cost. However, a single metal oxide semiconductor can generally not meet the requirement of PEC water splitting.…”

“…3,4 The α-Fe 2 O 3 is a suitable photoanode material for PEC water oxidation due to response to visible light, nontoxic, abundance, and good PEC stability in water and electrolyte. 5,6 However, the single α-Fe 2 O 3 is a poor conductor with a short holes diffusion length (2−4 nm), thus α-Fe 2 O 3 is easy to suffer recombination of electron−hole pairs in the bulk and poor surface reaction dynamics. 7−9 Tungsten trioxide (WO 3 ), similar to α-Fe 2 O 3 , has caused wide attention as a photoanode material for PEC water splitting, which is attributed to sufficiently positive VB position than the water oxidation potential, a longer holes diffusion length than α-Fe 2 O 3 , high electron mobility, and low cost.…”

“…However, a single metal oxide semiconductor can generally not meet the requirement of PEC water splitting. Many strategies have been attempted, such as heterojunction constructing, 10 morphology controlling, 5 doping, 11 and incorporating of oxygen evolution cocatalysts. 12 These trial results demonstrate that structuring heterostructure by introducing a second semiconductor with matching band gaps is a good strategy.…”

Activated carbon-doped with iron oxide nanoparticles (a-Fe2O3 NPs) preparation: particle size, shape, and impurity

“…A number of morphology characteristics have been reported i.e. sphere 25,26,28 , snowflake-like 29 , or rods 31 with a particle size of a few to several hundred nanometers.…”