Boosting photocatalytic water vapor splitting by the integration of porous g-C_(3)N_(4)and carbonized melamine foam  

多孔g-C_(3)N_(4)和碳化三聚氰胺泡沫的一体化构筑促进光催化分解水蒸气

作　　者：Shujian Wang Dongjie Liu Chunyang Zhang Jie Huang Shidong Zhao Kejian Lu Biao Wang Hao Peng Yitao Si Maochang Liu 王树建;柳东杰;张春阳;黄婕;赵仕东;吕科见;王标;彭好;司亦涛;刘茂昌(International Research Center for Renewable Energy,State Key Laboratory of Multiphase Flow in Power Engineering,Xi’an Jiaotong University,Xi’an,710049,China;School of Chemistry and Chemical Engineering,Southeast University,Nanjing,211189,China;Suzhou Academy of Xi’an Jiaotong University,Suzhou,215123,China;Gree Altairnano New Energy Inc.,Zhuhai,519040,China)

机构地区：[1]International Research Center for Renewable Energy,State Key Laboratory of Multiphase Flow in Power Engineering,Xi’an Jiaotong University,Xi’an,710049,China [2]School of Chemistry and Chemical Engineering,Southeast University,Nanjing,211189,China [3]Suzhou Academy of Xi’an Jiaotong University,Suzhou,215123,China [4]Gree Altairnano New Energy Inc.,Zhuhai,519040,China

出　　处：《Science China Materials》2024年第9期2957-2964,共8页中国科学（材料科学）（英文版）

基　　金：supported by the National Key Research and Development Program of China(2022YFB3803600);the National Natural Science Foundation of China(52276212);the Key Research and Development Program in Shaanxi Province of China(2023-YBGY-300);the Natural Science Foundation of Jiangsu Province(BK20231211);the Suzhou Science and Technology Program(SYG202101);Zhuhai Innovation and Entrepreneurship Team Project(2120004000225);the China Fundamental Research Funds for the Central Universities。

摘　　要：We report a photothermally-induced liquid-solid/gas-solid-decoupling photocatalytic water-splitting system,where a carbonized melamine foam(CMF)and a porous g-C_(3)N_(4)(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 368.1µmol h^(-1),which is 2.4 and 25.6 times larger than those of the traditional triphasic PCN system(151.7µmol h^(-1))and g-C_(3)N_(4)(CN)system(14.4µmol 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.本文报道了一种光热诱导的液-固/气-固解耦光催化分解水系统,其中碳化的三聚氰胺泡沫(CMF)和多孔g-C_(3)N_(4)(PCN)分别作为光热基底材料和模型光催化剂.CMF通过其光热效应将液态水转化为水蒸气,随后产生的水蒸气通过PCN光催化剂转化为氢气.该新型两相光催化体系的光催化速率高达368.1μmol h^(-1),分别是传统三相PCN体系(151.7μmol h^(-1))和CN体系(14.4μmol h^(-1))的2.4和25.6倍.光催化性能的提高主要归因于该系统优化了气-液-固反应界面的能量和物质传递,实现了光催化过程中气体产物的快速脱附.这项工作从能量流和质量流角度为光催化分解水提供了新的思路.

关 键 词：PHOTOCATALYTIC PHOTOTHERMAL mass transfer g-C_(3)N_(4) GAS-SOLID 

分 类 号：TQ116.2[化学工程—无机化工] O643.36[理学—物理化学] O644.1[理学—化学]