Ternary Schottky-p-n heterojunction strategy for enhancing photothermal dry reforming of methane.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 40680133.
- Also identified by DOI 10.1126/sciadv.adv5078 and PMC identifier 12273794.
- Licence recorded as CC BY-NC.
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Abstract
Breaking the trade-off between activity and stability in catalysts for dry reforming of methane has long remained a huge challenge. Here, we demonstrate a ternary Schottky-p-n (TSPN) heterojunction strategy based on Ni-NiO-Sr<sub>2</sub>Nb<sub>2</sub>O<sub>7</sub> (NiO<i><sub>x</sub></i>/SNO) for photothermal dry reforming of methane. This approach achieves a stable syngas production rate of 10.54 moles per gram per hour, with a light-to-fuel efficiency of 28.3% and a CH<sub>4</sub> turnover frequency of 18 per second at 500°C generated by concentrated light irradiation. This low-temperature, high-rate activity benefits from the photoaccelerated CH<sub>4</sub>-to-H<sub>2</sub> process facilitated by the synergistic effect of NiO and Ni<sup>0</sup>. Furthermore, the light-induced spatial separation of dual reduction sites for CO<sub>2</sub> reduction (SNO) and H<sub>2</sub> evolution (Ni<sup>0</sup>) suppresses the reverse water-gas shift (RWGS) reaction, ensuring continuous supply of active oxygen and improving reaction stability. This finding is expected to substantially promote low-temperature photothermal catalytic technology in enhancing the selective conversion efficiency of C<sub>1</sub> molecules.