3D Porous Pyramid Heterostructure Array Realizing Efficient Photo-Electrochemical Performance

• Direct photo-electrochemical (PEC) water splitting is of great practical interest for developing a sustainable energy systems, but remains a big challenge owing to sluggish charge separation, low efficiency, and poor stability. Herein, a 3D porous In2O3/In2S3 pyramid heterostructure array on a fluorine-doped tin oxide substrate is fabricated by an ion exchange–induced synthesis strategy. Based on the synergistic structural and electronic modulations from density functional theory calculations and experimental observations, 3D porous In2O3/In2S3 photoanode by the protective layer delivers a low onset potential of ≈0.02 V versus reversible hydrogen electrode (RHE), the highest photocurrent density of 8.2 mA cm−2 at 1.23 V versus RHE among all the In2S3 photoanodes reported to date, an incident photon-to-current efficiency of 76% at 400 nm, and high stability over 20 h for PEC water splitting are reported. This work provides an alternative promising prototype for the design and construction of novel heterostructures in robust PEC water splitting applications.

Ämnesord

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

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

Nyckelord

3D porous pyramid array

heterostructures

photo-electrochemical performance

photoanodes

Density functional theory

Heterojunctions

Indium sulfide

Ion exchange

Nanocomposites

Tin oxides

Design and construction

Electrochemical performance

Fluorine doped tin oxide

Incident photon-to-current efficiencies

Photo-anodes

Pyramid arrays

Reversible hydrogen electrodes

Sustainable energy systems

Photoelectrochemical cells

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