Recent strategies to enhance the efficiency of hematite photoanodes in photoelectrochemical water splitting

Dynamic charge collecting mechanisms of cobalt phosphate on hematite photoanodes studied by photoinduced absorption spectroscopy

“…Among various photoanodes, hematite (Fe 2 O 3 ) has received lots of attention owing to its abundant, nontoxic and scalable characteristics. 7,8 There have been many research studies on revealing hole storage sites related to PEC properties in the bare Fe 2 O 3 system, including reaction intermediates, [9][10][11] multi-hole cooperation clusters 4,12 and lling surface trap states. 13 In order to promote PEC performances, the OER catalysts, such as cobalt phosphate (CoPi) 14 and NiFe(OH) x electrocatalysts, [15][16][17] are usually loaded on the Fe 2 O 3 surface as new hole storage sites.…”

Z-Scheme photocatalytic solar-energy-to-hydrogen conversion driven by the HfS2/SiSe heterostructure

“…26 Recently, a number of investigations were performed to promote Z. [27][28][29][30][31] Among them, the van der Waals (vdW) heterostructure with the Z-scheme is conspicuous because it can overcome the constraints by a different mechanism so that the oxidation and reduction reactions occur in different monolayers, and the optical absorption depends on the monolayers separately. Moreover, the direct Z-scheme can significantly decrease the recombination between the photogenerated electrons and holes at the reduction and oxidation sites, respectively.…”

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

“…Additionally, the fact that the capacitance at the semiconductor and electrolyte interface (CPE 2 ) values for the Zr/Be-HT increased in comparison to those of other photoanodes indicates that interfacial charge transfer is more advantageous for the codoped photoanode. 47 To study the electron transport characteristics of the asstudied Fe 2 O 3 photoanodes, IMPS was carried out at 1.23 V vs. RHE, and the calculated electron transport time (τ et ) values are listed in Table S3. As depicted in Figure 4e, the Zr/Be-HT photoelectrode exhibits a lower τ et (0.18 ms) value than the other photoanodes, signifying a decrease in the bulk chargetransfer resistance in Zr/Be-HT.…”