Simultaneously Utilizing Excited Holes and Electrons for Piezoelectric-Enhanced Photoproduction of H2O2 from S-Scheme 2D S-Doped VOx/g-C3N4 Nanostructures

• DOI: 10.1021/acsami.4c04387
• Publication Date: 2024-05-22T19:45:25Z
• Authors: Huynh Phuoc Toan; Duc-Viet Nguyen; Pham Duc Minh Phan; Nguyen Hoai Anh; Pho Phuong Ly; Minh-Thuan Pham; Seung Hyun Hur; Thuy Dieu Thi Ung; Do Danh Bich; Minh Chien Nguyen; Ngoc Linh Nguyen; Dang Thuong Huyen; Woo Jong Yu; Hoai-Thanh Vuong

2D/2D step-scheme (S-scheme) piezo-photocatalysts for the production of fine chemicals, such as hydrogen peroxide (H2O2), have attracted significant attention global scientists owing to efficiency in utilizing surface piezoelectric effects from 2D materials overcome rapid charge recombination photocatalytic processes. In this research, we reported fabrication S-doped VOx deposited on g-C3N4 produce H2O2 via piezo-photocatalytic process with high yields at 20.19 mmol g–1 h–1, which was 1.75 and 4.87 times higher than that solely piezo-catalytic generation. The finding pointed out adding sulfur (S) can help improve catalytic outcomes by modifying electronic properties pristine VOx. addition, when coupled g-C3N4, presence S limits formation graphene VOx/g-C3N4 composites, causing shielding pushing cascade reactions toward water generation materials. Besides, research also sheds light transport between S-VOx under irradiation how composites work trigger H2O2. composite systems enhances transfer two semiconductors strengthening internal electric fields (IEF) drive electrons moving one direction, demonstrated density functional theory (DFT) calculations. Moreover, significantly relies reduction oxygen generate oxygenic radical species sites. Meanwhile, provides oxidative sites oxidize molecules directly or indirectly O2, will further participate final products. This study confirms validation S-scheme piezo-photocatalysts, thus encouraging developing heterojunction efficiency, be used practical conditions.