Surface states modulation of hematite photoanodes for enhancing photoelectrochemical catalysis

Influence of Successive Zirconium and Beryllium Codoping Strategies on Advancing Bulk and Surface Properties of Hematite Photoanodes for Boosting Photoelectrochemical Water Splitting

“…In order to acquire more specifics on the passivation of surface-trapping states and charge-transfer dynamics at the photoelectrode/electrolyte interface, we assessed the transient anodic time constant ( τ t ) at 1.23 V RHE and accumulated charges ( I D ) in the space charge region at various potentials of the as-fabricated photoanodes using equations that were reported elsewhere . As depicted in Figure d, Zr/Be-HT has the longest τ t , attesting that Be codoping effectively reduces surface charge recombination . This phenomenon could be attributable to the eradication of surface defects and augmentation of interfacial charge transfer.…”

“…60 As depicted in Figure 6d, Zr/Be-HT has the longest τ t , attesting that Be codoping effectively reduces surface charge recombination. 61 This phenomenon could be attributable to the eradication of surface defects and augmentation of interfacial charge transfer. The obvious decrease in I D values for Zr/Be-HT in the potential range of 1.0−1.4 V RHE (Figure 6e) unambiguously demonstrates that Be codoping has a positive effect on interfacial charge transfer.…”

Z-scheme charge transfer between a conjugated polymer and α-Fe2O3 for simultaneous photocatalytic H2 evolution and ofloxacin degradation

“…48,49 For α-Fe 2 O 3 , Fermi level pinning appears because of its large surface state. 50,51 That means the surface adsorbed species do not have a significant effect on the Fermi level of α-Fe 2 O 3 . Therefore, the up-lift Fermi level with a corresponding reduced work function of PEB-DBT in TEOA and OFL, realizing the reversal of work function difference between PEB-DBT and α-Fe 2 O 3 .…”

“…48,49 For a-Fe 2 O 3 , Fermi level pinning appears because of its large surface state. 50,51 That means the surface adsorbed species do not have a signicant effect on the Fermi level of a-Fe 5b). Therefore, H 2 could be produced with FPD-m in TEOA and OFL, and cO 2 − is conrmed to take part in OFL degradation.…”

Expediting hole transfer kinetics through surface state modulation of a Ru–FeOOH and FeNi(OH)x dual-layer cocatalyst coated Zr–Fe2O3 photoanode for boosting photoelectrochemical water splitting

“…10 When an indirect charge transfer process is taken into account, the recombination of photogenerated holes and electrons in the conduction band (CB) occurs at recombination surface states (r-SS) at lower oxidation energy due to the FLP effect. 11 Therefore, engineering modifications at the surface of the photoanode could have a substantial impact on charge separation and transfer at the semiconductor–electrolyte interface (SEI) through i-SS. The application of cocatalysts is a viable strategy for enhancing OER kinetics by passivating r-SS, thus alleviating surface FLP for efficient PEC water splitting.…”