# Fabricating Inorganic/Organic S-Scheme Heterojunction for Efficient Photocatalytic Production of H2 and H2O2

## TL;DR

This paper presents a new inorganic/organic S-scheme heterojunction that significantly boosts hydrogen and hydrogen peroxide production for sustainable energy and environmental applications.

## Contribution

The study introduces a novel inorganic/organic S-scheme heterojunction with a strong built-in electric field for enhanced photocatalytic performance.

## Key findings

- The BWO/ZTP-1 heterojunction achieves 2,343.3 and 236.1 μmol·g−1·h−1 for H2 and H2O2 production.
- The built-in electric field is shown to be pivotal for the enhanced photocatalytic activity.
- The performance is 14.9 and 3.44 times higher for H2 and 2.33 and 2.27 times for H2O2 compared to pristine materials.

## Abstract

Enhancing the efficiency of photocatalytic H2 evolution and H2O2 production through heterojunction engineering is crucial for addressing energy sustainability and environmental challenges. In this context, constructing S-scheme heterojunctions has emerged as a promising strategy. Here, we report an inorganic/organic S-scheme Bi2WO6/zinc(II) tetrakis(4-carboxy-phenyl)porphyrin (BWO/ZTP) heterojunction with a strong built-in electric field, constructed via an interface induction strategy. The optimal BWO/ZTP-1 achieves exceptional H2 evolution and H2O2 production activity, achieving 2,343.3 and 236.1 μmol·g−1·h−1. These represent remarkable enhancements of 14.9 and 3.44 times for H2 and 2.33 and 2.27 times for H2O2 over pristine BWO and Zn-TCPP. By using femtosecond transient absorption spectroscopy, Kelvin probe force microscopy, in situ x-ray photoelectron spectroscopy and density functional theory, we demonstrate that built-in electric field is pivotal for the exceptional performance, which leads to the proposal of a photocatalytic mechanism. This work provided feasible insights and references for the design of novel and superior inorganic/organic S-scheme heterojunction photocatalysts with tight contact and synergistic interaction for photocatalytic applications.