Abstract
The uncondensed form of polymeric carbon nitrides (PCN), generally known as melon, is a stacked 2D structure of poly(aminoimino)heptazine. Melon is used as a photocatalyst in solar energy conversion applications, but suffers from poor photoconversion efficiency due to weak optical absorption in the visible spectrum, high activation energy, and inefficient separation of photoexcited charge carriers. Experimental and theoretical studies are reported to engineer the bandgap of melon with highly reduced graphene oxide (HRG). Three HRG@melon nanocomposites with different HRG:melon ratios (0.5%, 1%, and 2%) are prepared. The 1% HRG@melon nanocomposite shows higher photocurrent density (71 µA cm−2) than melon (24 µA cm−2) in alkaline conditions. The addition of a hole scavenger further increases the photocurrent density to 630 µA cm−2 relative to the reversible hydrogen electrode (RHE). These experimental results are validated by calculations using density functional theory (DFT), which revealed that HRG results in a significant charge redistribution and an improved photocatalytic hydrogen evolution reaction (HER).
Original language | English |
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Article number | 2301342 |
Journal | Advanced Materials |
Volume | 35 |
Issue number | 47 |
DOIs | |
State | Published - 23 Nov 2023 |
Bibliographical note
Publisher Copyright:© 2023 The Authors. Advanced Materials published by Wiley-VCH GmbH.
Keywords
- 2D materials
- HRG@melon
- PEC water splitting
- hydrogen evolution
- melon
ASJC Scopus subject areas
- General Materials Science
- Mechanics of Materials
- Mechanical Engineering