Photocatalytic NH3 versus H2 evolution over g-C3N4/CsxWO3: O2 and methanol tipping the scale

Anye Shi, Huihui Li, Shu Yin, Zaili Hou, Jiayue Rong, Jiachi Zhang, Yuhua Wang

Research output: Contribution to journalArticle

19 Citations (Scopus)

Abstract

CsxWO3 nanorods can be used to sensitize the single layer g-C3N4, where full spectrum light harvesting excited electrons to drive the photocatalytic reduction of N2 into NH3. Under UV light, both water splitting and solar ammonia synthesis reaction exhibit high activity. However, selectivity towards ammonia over hydrogen is realized under NIR irradiation. With the control of methanol, O2 can directly decide the NH3 or H2 evolution on photocatalyst. The origin is the strong capture of O2 with the electrons from the photocatalyst under light irradiation to yield the oxygen active species, which transfer electrons subsequently with help of methanol to generate NH3. However, H2 production will be suppressed by O2. And with its sacrifice, methanol preserves the produced NH3 from oxidation. The O2-sacrificial agent mediated NH3 evolution reaction found here provides insights in the promotion role of them in other catalysis.

Original languageEnglish
Pages (from-to)197-206
Number of pages10
JournalApplied Catalysis B: Environmental
Volume235
DOIs
Publication statusPublished - 2018 Nov 5

Keywords

  • H evolution
  • N fixation
  • O content
  • Photocatalysis
  • Sacrificial agent

ASJC Scopus subject areas

  • Catalysis
  • Environmental Science(all)
  • Process Chemistry and Technology

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