A metal-free heptazine-porphyrin based porous polymeric network as an artificial leaf for carbon-free solar fuels

Sunil Kumar, Venugopala Rao Battula, Neha Sharma, Soumadri Samanta, Bhawna Rawat, Kamalakannan Kailasam

Research output: Contribution to journalArticlepeer-review

5 Scopus citations

Abstract

Carbon-free solar fuel production driven by solar energy has become a holy grail for a future sustainable world. In recent years, much interest has been centered on hydrogen peroxide (H2O2), a carbon-free solar fuel that is superior to hydrogen (H2) in terms of transportation and direct use in membrane-free fuel cells. Thus, H2O2 production using solar energy from pure water over visible-light-active photocatalysts is a more sustainable approach than existing anthraquinone-based processes. Herein, for the first time, a metal-free heptazine-based porous polymeric network (HMP-PPR) featuring heptazine and porphyrin units bridged through -NH- bonds is developed. Under simulated sunlight, HMP-PPR shows nearly 9 times higher H2O2 production than graphitic carbon nitride (g-CN). Further, HMP-PPR stably generates 750 μmol g−1 H2O2 over propan-2-ol in 24 h. Interestingly, under natural sunlight, it produces 151 μmol g−1 H2O2 from pure water in 4 h through both a two-electron oxygen reduction reaction and two-electron water oxidation. Such exciting results are explained based on the unique band positions of the material, oxygraph analysis, and theoretical studies. This study explains the importance of heptazine-based porous polymeric networks in liquid solar fuel production.

Original languageEnglish
Pages (from-to)14568-14575
Number of pages8
JournalJournal of Materials Chemistry A
Volume10
Issue number27
DOIs
StatePublished - 17 Jun 2022
Externally publishedYes

ASJC Scopus subject areas

  • Chemistry (all)
  • Renewable Energy, Sustainability and the Environment
  • Materials Science (all)

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