Self-surface-passivation of titanium doped hematite photoanode for efficient solar water and formaldehyde oxidation

Zheng, Dezhou; He, Xinjun; Xu, Wei; Lu, Xihong

doi:10.1016/j.materresbull.2017.03.063

Cited by 14 publications

(5 citation statements)

References 47 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…As mentioned, the passivation of the α‐Fe 2 O 3 surface by depositing a thin overlayer of metal oxides, metal hydroxides, graphene, g‐C 3 N 4 , etc ., has a great impact on the charge separation as well as charge transfer enhancement across the solid‐liquid interface. There are different theories to explain the role of the passivation layer in improving the PEC water oxidation performance , ,. Yang et al .…”

Section: General Strategies To Improve the Photoelectrochemical Perfomentioning

confidence: 99%

Key Strategies to Advance the Photoelectrochemical Water Splitting Performance of α‐Fe₂O₃ Photoanode

2018

View full text Add to dashboard Cite

The last few decades’ extensive research on the photoelectrochemical (PEC) water splitting has projected it as a promising approach to meet the steadily growing demand for cleaner and renewable energy in a sustainable and economically viable fashion. Among many potential photocatalysts, hematite (α‐Fe2O3) emerges as a highly promising photoanode material with favorable characteristics including visible light absorption (a suitable band gap energy), earth abundance, chemical stability, and low cost. A pronounced disadvantage of α‐Fe2O3 is its low photovoltage together with an extremely short hole diffusion length and a low electrical conductivity, which limit its PEC water oxidation performance. To make α‐Fe2O3 as a viable photocatalyst for PEC water splitting, one needs to rectify these unfavorable characteristics of α‐Fe2O3 by elaborated multiple modifications. In this review article, we introduce various modification strategies of hematite with emphasis on surface modifications to achieve low onset potential as well as high photocurrent approaching the theoretical value for solar water splitting.

show abstract

Section: General Strategies To Improve the Photoelectrochemical Perfomentioning

confidence: 99%

Key Strategies to Advance the Photoelectrochemical Water Splitting Performance of α‐Fe₂O₃ Photoanode

2018

View full text Add to dashboard Cite

show abstract

“…Besides, the excitation lifetime for hematite is very small (∼10 ps) [5]. These shortcomings lead to fast electron-hole recombination, ultimately affecting the hematite PEC water oxidation potential [12]. However, studies have proved that nanostructured hematite such as nanoparticles [13], nanosheets [14], nanospheres [15], cauliflowers [16], and nanorods (NRs) [17], show improved performance in PEC applications.…”

Section: Introductionmentioning

confidence: 99%

The behavior of hydrothermally synthesized hematite nanorods prepared on spin coated seed layers

Talibawo¹,

Nyarige²,

Kyesmen³

et al. 2022

Mater. Res. Express

View full text Add to dashboard Cite

Herein we report on the effect of varied spin-coated seed layer concentrations of Iron (III) chloride hexahydrate (FeCl3.6H2O) on the photoelectrochemical performance of hydrothermally synthesized hematite nanorods. The seed layers were prepared from 0.05, 0.07, 0.09, 0.11, and 0.13 M concentrations of FeCl3.6H2O. The nanorods were vertically aligned with slight inclinations over the seed layers with the two lowest molar concentrations (0.05 and 0.07 M) of FeCl3.6H2O. A further increase in seed layer concentrations transformed the nanorods as they grew over others and agglomerated into clusters. Structural analysis using X-ray diffraction (XRD) and Raman spectroscopy demonstrated uniform hematite crystalline peaks for all the samples. All samples absorbed highly in the visible region within an onset absorption edge wavelength ranging from 624 to 675 nm. Overall, the nanorods synthesized over the lowest seed layer concentration of 0.05 M of FeCl3.6H2O exhibited the highest photocurrent density of 0.077 mA/cm2 at 1.5 V vs. reversible hydrogen electrode. The results obtained provide important information about the structural, optical, and photoelectrochemical properties of hematite nanorods synthesized over varied seed layer concentrations. This is a key contribution in understanding and enhancing the hematite nanorods performance for photocatalytic applications.

show abstract

“…In contrast to this method, the direct immersion of Fe 2 O 3 in 1 M KOH was reported for selfpassivation. 53 In view of the passivating effect, improved donor density and increased surface charge transfer properties could be observed, which contributed to enhanced photoactivity.…”

Section: Chemical Modicationmentioning

confidence: 99%

Recent progress on post-synthetic treatments of photoelectrodes for photoelectrochemical water splitting

et al. 2021

View full text Add to dashboard Cite

show abstract

Self-surface-passivation of titanium doped hematite photoanode for efficient solar water and formaldehyde oxidation

Cited by 14 publications

References 47 publications

Key Strategies to Advance the Photoelectrochemical Water Splitting Performance of α‐Fe₂O₃ Photoanode

Key Strategies to Advance the Photoelectrochemical Water Splitting Performance of α‐Fe₂O₃ Photoanode

The behavior of hydrothermally synthesized hematite nanorods prepared on spin coated seed layers

Recent progress on post-synthetic treatments of photoelectrodes for photoelectrochemical water splitting

Contact Info

Product

Resources

About

Self-surface-passivation of titanium doped hematite photoanode for efficient solar water and formaldehyde oxidation

Cited by 14 publications

References 47 publications

Key Strategies to Advance the Photoelectrochemical Water Splitting Performance of α‐Fe2O3 Photoanode

Key Strategies to Advance the Photoelectrochemical Water Splitting Performance of α‐Fe2O3 Photoanode

The behavior of hydrothermally synthesized hematite nanorods prepared on spin coated seed layers

Recent progress on post-synthetic treatments of photoelectrodes for photoelectrochemical water splitting

Contact Info

Product

Resources

About

Key Strategies to Advance the Photoelectrochemical Water Splitting Performance of α‐Fe₂O₃ Photoanode

Key Strategies to Advance the Photoelectrochemical Water Splitting Performance of α‐Fe₂O₃ Photoanode