A two-photon tandem black phosphorus quantum dot-sensitized BiVO₄ photoanode for solar water splitting

Abstract

The photoelectrochemical (PEC) water splitting efficiency is profoundly restricted by the limited light harvesting, rapid charge recombination, and sluggish water oxidation kinetics, in which the construction of a photoelectrode requires...

Recent research progress on operational stability of metal oxide/sulfide photoanodes in photoelectrochemical cells

“…ClO4 − (aq) → ClO4•(aq) + e − E 0 = 2.75 V vs. NHE (12) At this time, introducing Cl − can alleviate the deposition of the abovementioned peroxides on the surface of WO3, which improves the performance and stability of the WO3 photoanode. Based on the position of the VB of WO3, the following reactions occur…”

“…Moreover, similar to other metal oxides, the accumulation of photogenerated holes is also the main cause of BiVO4 photocorrosion. The most direct and effective solution to the problem of accumulation or slow transfer of photogenerated holes on the surface is to load various OECs to reduce the surface recombination and the photocorrosion phenomenon [12,[118][119][120]. Because of the extensive attention of researchers on BiVO4, most of the works based on BiVO4 have been reported, such as that of Ni/FeOOH, CoOx, LDH, and so on [6].…”

“…The performance of photoanodes has improved rapidly in recent years. Taking BiVO4 as an example, its photocurrent density (J) has reached a maximum of 6.2 mA•cm −2 [12]. At the same time, the performance of metal sulfides has reached as high as 15.35 mA•cm −2 [13].…”

Chemically functionalized phosphorenes and their use in the water splitting reaction

“…115 The optimal photocurrent of 9.11 mA cm À2 has been obtained on 7 wt% loading of BPQD on g-C 3 N 4 nanosheets. To utilize the broad light absorption capability of BPQDs, Jin et al 133 have fabricated a two-photon E-BiVO 4 / BPQDs/OL-OEC (E-BiVO 4 ¼ etched BiVO 4 ) photoanode passivated with TiO 2 overlayer (OL) and coated with NiOOH as oxygen evolution catalyst (OEC). The anode shows a remarkable photocurrent density of 6.2 mA cm À2 at 1.23 V vs. RHE, under AM 1.5 illumination (Fig.…”

Efficient Oxygen Evolution Reaction on Polyethylene Glycol‐Modified BiVO4 Photoanode by Speeding up Proton Transfer

“…[23] In fact, the rate-determining step, that is the formation of OO bond, is energetically uphill. [24][25][26] The quick departure of protons plays an important role in the rate-determining step, making the OO bond form quickly and accelerating the reaction rate of oxygen evolution. [27][28][29] Polyethylene glycol (PEG), a simple linear polymer molecule with a high proton conductivity, [30][31][32] which can help protons to leave quickly, may accelerate the OO bond formation rate and improve the water oxidation kinetics.…”