Construction of organic–inorganic hybrid composites derived from C3N5 incorporated with CeO2 for enhanced photocatalytic hydrogen evolution†

IF 3.2 Q2 CHEMISTRY, PHYSICAL
Energy advances Pub Date : 2024-09-03 DOI:10.1039/D4YA00476K
Ashil Augustin, Manova Santhosh Yesupatham, M. D. Dhileepan, Sanguk Son, Ezhakudiyan Ravindran, Bernaurdshaw Neppolian, Hyoung-il Kim and Karthikeyan Sekar
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Abstract

Energy scarcity and environmental issues can be effectively addressed via photocatalytic hydrogen production. The effective combination of semiconductor materials can prevent exciton recombination, making it a highly effective method for enhancing photocatalytic activity. This study details the synthesis of a conjugated polymer encapsulated with a metal oxide photocatalyst using a simple ex situ method. The encapsulation of the polymer with CeO2 nanoparticles resulted in exceptional performance in H2 production, exhibiting improved visible light absorption and a significant increase in charge transfer efficiency. This is attributed to the high charge transfer and reduced recombination in the composite. Moreover, photogenerated holes led to a substantial decline in the recombination rate of excitons and concomitant enhancement in the rate of photocatalytic H2 production. Markedly, the observed hydrogen evolution for 10 wt% of CeO2 doped C3N5 composites is 1256 μmol g−1 h−1, whereas for C3N5, it is 125 μmol g−1 h−1. Electrochemical analysis showed that the optimized composites exhibit a low electron–hole recombination rate, and UV-vis spectroscopic analysis showed improved visible light absorption resulting in excellent photocatalytic activity. Notably, the proposed system offers a novel strategy for hydrogen evolution via photocatalysis using CeO2/C3N5 composites. Consequently, this research offers a new perspective on the design of organo–inorganic heterostructures and introduces a novel pathway to explore their catalytic capabilities.

Abstract Image

构建由 C3N5 与 CeO2 结合而成的有机无机杂化复合材料,用于增强光催化氢气进化
光催化制氢可有效解决能源短缺和环境问题。半导体材料之间的有效结合能够防止激子重组,是一种非常有效的增强光催化活性的方法。本报告采用简单的原位合成方法合成了包裹金属氧化物光催化剂的共轭聚合物。将聚合物与 CeO2 纳米粒子封装在一起后,样品对可见光的吸收得到改善,电荷转移效率显著提高,因此在生产 H2 方面表现优异。这归功于复合材料中的高电荷转移和减少的重组。光生空穴的高效转移导致激子的重组率大幅下降,光催化产生 H2 的速率大幅提高。结果表明,10 wt.% CeO2/C3N5 复合材料的氢气进化量为 1256 μmol/g/h,而 C3N5 为 125 μmol/g/h。电化学分析表明,优化后的复合材料具有较低的电子空穴重组率和更高的可见光吸收率,从而表现出优异的光催化活性。值得注意的是,该研究首次报道了利用 CeO2/C3N5 复合材料通过光催化实现氢气进化。因此,这项研究为有机无机异质结构的设计提供了一个新的视角,并将为其催化功能提供一条新的途径。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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CiteScore
1.80
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