Engineering MoOx/MXene Hole Transfer Layers for Unexpected Boosting of Photoelectrochemical Water Oxidation

• The development of semiconductor photoanodes is of great practical interest for the realization of photoelectrochemical (PEC) water splitting. Herein, MXene quantum dots (MQD) were grafted on a BiVO4 substrate, then a MoOx layer by combining an ultrathin oxyhydroxide oxygen evolution cocatalyst (OEC) was constructed as an integrated photoanode. The OEC/MoOx/MQD/BiVO4 array not only achieves a current density of 5.85 mA cm−2 at 1.23 V versus a reversible hydrogen electrode (vs. RHE), but also enhances photostability. From electrochemical analysis and density functional theory calculations, high PEC performance is ascribed to the incorporation of MoOx/MQD as hole transfer layers, retarding charge recombination, promoting hole transfer and accelerating water splitting kinetics. This proof-of-principle work not only demonstrates the potential utilization of hole transfer layers, but also sheds light on rational design and fabrication of integrated photoanodes for feasible solar energy conversion. 

Ämnesord

NATURVETENSKAP  -- Kemi -- Fysikalisk kemi (hsv//swe)

NATURAL SCIENCES  -- Chemical Sciences -- Physical Chemistry (hsv//eng)

NATURVETENSKAP  -- Kemi -- Materialkemi (hsv//swe)

NATURAL SCIENCES  -- Chemical Sciences -- Materials Chemistry (hsv//eng)

Nyckelord

Hole Transfer Layer

Integrated Photoanode

MXene Quantum Dots

Photoelectrochemical Water Splitting

Reaction Kinetics

Bismuth compounds

Density functional theory

Energy conversion

Molybdenum oxide

Nanocrystals

Photoelectrochemical cells

Quantum chemistry

Solar energy

Co catalysts

Hole transfer

Mxene quantum dot

Oxygen evolution

Photo-anodes

Photoelectrochemical water oxidation

Transfer layers

Semiconductor quantum dots

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