Bottom-up synthesis of semiconductive carbonaceous nanosheets on hematite photoanode for photoelectrochemical water splitting  

作　　者：Guosheng Li Zhuofeng Hu 

机构地区：[1]School of Environment Science and Engineering,Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology,Sun Yat-sen University,Guangzhou 510275,China [2]College of Environmental and Chemical Engineering,Zhaoqing University,Zhaoqing 526061,China [3]State Key Laboratory of Photocatalysis on Energy and Environment,College of Chemistry,Fuzhou University,Fuzhou 350116,China

出　　处：《Nano Research》2022年第1期627-636,共10页纳米研究（英文版）

基　　金：supported by the Guangdong Basic and Applied Basic Research Foundation(No.2019B1515120058);the National Natural Science Foundation of China(No.51902357);the Natural Science Foundation of Guangdong Province,China(No.2019A1515012143);the Start-up Funds for High-Level Talents of Sun Yat-sen University(No.38000-18841209);the Fundamental Research Funds for the Central Universities(No.19lgpyl53)。

摘　　要：Coupling two-dimention carbon materials like graphene on photodelectrode can achieve high-efficiency photoelectrochemical cells.Bottom-up synthesis of carbon-based two-dimensional materials in green media from simple molecules is very attractive but remains a challenge.Carbohydrate is an ideal precursor for the synthesis but previous report requires pyrolysis at high temperature(>700℃).Herein,starting with glucose,we develop a low temperature(210℃)synthesis of carbonaceous nanosheets in aqueous solution of glucose.With the aid of ethylenediamine and Fe3+/Fe27Co27Ni2+ions,the nanosheets can grow on hematite nanorod array with very close contact.Importantly,a metallic region is formed at the interface due to atom distribution distortion,which can promote the charge transfer.The activity can be greatly enhanced by about 500%due to fast charge transfer.This is much better than that prepared by physically or chemically mixing graphene and hematite(<200%).The enhancement is mainly due to the deformation area between the nanosheets and the hematite.The effective hole diffusion length increases from 2 to 8 nm and lifetime of charge carrier also increases,as confirmed by ultrafast transient absorption spectra.This method provides more opportunity for simple,mild and cost-effective fabrication of carbon-based two-dimensional by bottom-up method.

关 键 词：photocatalytic water oxidation HEMATITE two-dimensional carbon BOTTOM-UP 

分 类 号：TB383[一般工业技术—材料科学与工程] O646[理学—物理化学]