Boosting photocatalytic water vapor splitting by the integration of porous g-C3N4 and carbonized melamine foam

IF 6.8 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Science China Materials Pub Date : 2024-07-17 DOI:10.1007/s40843-024-3005-y

Shujian Wang (, ), Dongjie Liu (, ), Chunyang Zhang (, ), Jie Huang (, ), Shidong Zhao (, ), Kejian Lu (, ), Biao Wang (, ), Hao Peng (, ), Yitao Si (, ), Maochang Liu (, )

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Abstract

We report a photothermally-induced liquid-solid/gas-solid-decoupling photocatalytic water-splitting system, where a carbonized melamine foam (CMF) and a porous g-C₃N₄ (PCN) serve as the photothermal substrate and model photocatalyst, respectively. Specifically, liquid water is transformed into the gaseous phase over the CMF due to the photothermal effect, and the generated vapor can be split into hydrogen by PCN via the photocatalysis. This unique biphasic photocatalytic system exhibits a high hydrogen production rate of 368.1 µmol h⁻¹, which is 2.4 and 25.6 times larger than those of the traditional triphasic PCN system (151.7 µmol h⁻¹) and g-C₃N₄ (CN) system (14.4 µmol h⁻¹), respectively. The improved photocatalytic performance is mainly attributed to the optimized energy and mass transfer at the gas-liquid-solid reaction interface, where gas products are rapidly desorbed in the photocatalytic process. This work provides a novel strategy to enhance the photocatalytic performance from the perspectives of energy and mass flow.

Abstract Image

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通过整合多孔 g-C3N4 和碳化三聚氰胺泡沫促进光催化水汽分离

我们报告了一种光热诱导的液固/气固解偶光催化分水系统，其中碳化三聚氰胺泡沫（CMF）和多孔 g-C3N4（PCN）分别作为光热基底和模型光催化剂。具体来说，液态水在 CMF 上通过光热效应转化为气态，而生成的水蒸气可通过 PCN 的光催化作用转化为氢气。这种独特的双相光催化系统的产氢率高达 368.1 µmol h-1，分别是传统三相 PCN 系统（151.7 µmol h-1）和 g-C3N4 (CN) 系统（14.4 µmol h-1）的 2.4 倍和 25.6 倍。光催化性能的提高主要归功于气-液-固反应界面上能量和质量传递的优化，气体产物在光催化过程中被迅速解吸。这项工作从能量和质量流的角度为提高光催化性能提供了一种新策略。

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来源期刊

Science China Materials Materials Science-General Materials Science

CiteScore

11.40

自引率

7.40%

发文量

949

期刊介绍： Science China Materials (SCM) is a globally peer-reviewed journal that covers all facets of materials science. It is supervised by the Chinese Academy of Sciences and co-sponsored by the Chinese Academy of Sciences and the National Natural Science Foundation of China. The journal is jointly published monthly in both printed and electronic forms by Science China Press and Springer. The aim of SCM is to encourage communication of high-quality, innovative research results at the cutting-edge interface of materials science with chemistry, physics, biology, and engineering. It focuses on breakthroughs from around the world and aims to become a world-leading academic journal for materials science.