A hybrid CoOOH-rGO/Fe2O3 photoanode with spatial charge separation and charge transfer for efficient photoelectrochemical water oxidation

Unveiling the Synchronized Effect of Bulk and Surface Dual Modification of In Situ Nb-Doping and Microwave-Assisted Co(OH)x Cocatalyst for Boosting Photoelectrochemical Water Splitting of Fe2O3 Photoanodes

“…Conversely, the Nb-HT exhibits a higher k ct value than the Nb-HT/Co­(OH) x photoanode above 1.23 V RHE . This could be explained by the fact that the instinct stronger thermodynamic driving force from the valence band edge of Fe 2 O 3 (2.48 V RHE ), than that of Co 3+ /Co 2+ redox potentials (1.55 V RHE ) . Previously, a similar trend was observed in CoFe–Prussian blue modified BiVO 4 photoanodes .…”

Expediting hole transfer via surface states in hematite-based composite photoanodes

“…22,23 However, a limitation still exists, that is, the stored holes in monometallic electrocatalysts cannot be transferred efficiently to oxidize water. 24,25 Thus, to overcome this issue, acidic cations possessing electron-withdrawing character are introduced to enhance the electrochemical activity. For example, high-valent W 6+ with empty d-orbitals can obtain electrons from Co to facilitate the production of Co 3+ , thus leading to an excellent OER performance.…”

A highly enhanced photoelectrochemical performance of BiVO4 photoanodes modified with CoPi groups by increasing energy band bending, accelerating hole separation and improving water oxidation kinetics

“…17 It is worth noting that the loading of highly active oxygen evolution co-catalysts has been proven to be a promising strategy for building an efficient PEC photoanode. 18 A number of oxygen evolution co-catalysts such as CoPi, 19 CoBi, 20 MCo 2 O 4 (M = Mn, Zn), 21 CoOOH, 22 and FeOOH/NiOOH 23,24 have been researched to decrease the onset potential and accelerate the oxygen evolution reaction (OER) at the electrode/electrolyte interface. In the Co based co-catalyst studies, cobalt phosphate (CoPi) has been widely used due to the low cost, convenient preparation and excellent OER activity in PEC water oxidation.…”