Charge carrier

Irradiation

Work function

Physics

Engineering

Catalysis

Nanotechnology

X-ray photoelectron spectroscopy

Nuclear physics

Chemistry

Electron paramagnetic resonance

Materials science

Layer (electronics)

Chemical engineering

Nuclear magnetic resonance

Optoelectronics

Biochemistry

Photocatalysis

Photochemistry

Heterojunction

Small

Reasonable design of efficient hierarchical photocatalysts has gained significant attention. Herein, a step-scheme (S-scheme) core-shell TiO2 @ZnIn2 S4 heterojunction is designed for photocatalytic CO2 reduction. The optimized sample exhibits much higher CO2 photoreduction conversion rates (the sum yield of CO, CH3 OH, and CH4 ) than the blank control, i.e., ZnIn2 S4 and TiO2 . The improved photocatalytic performance can be attributed to the inhibited recombination of photogenerated charge carriers induced by S-scheme heterojunction. The improvement is also attributed to the large specific surface areas and abundant active sites. Meanwhile, S-scheme photogenerated charge transfer mechanism is testified by in situ irradiated X-ray photoelectron spectroscopy, work function calculation, and electron paramagnetic resonance measurements. This work provides an effective strategy for designing highly efficient heterojunction photocatalysts for conversion of solar fuels.

In situ Irradiated XPS Investigation on S‐Scheme TiO 2 @ZnIn 2 S 4 Photocatalyst for Efficient Photocatalytic CO 2 Reduction