Mg-O-Bridged Polypyrrole/g-C3N4 Nanocomposites as Efficient Visible-Light Catalysts for Hydrogen Evolution

被引：26

作者：

Guo, Xin ^{[1
]}

Hu, Kang ^{[1
]}

Chu, Mingna ^{[1
]}

Li, Yong ^{[1
]}

Bian, Ji ^{[1
]}

Qu, Yang ^{[1
]}

Chu, Xiaoyu ^{[1
]}

Yang, Fan ^{[1
]}

Zhao, Qi ^{[1
]}

Qin, Chuanli ^{[1
]}

Jing, Liqiang ^{[1
]}

机构：

[1] Heilongjiang Univ, Key Lab Funct Inorgan Mat Chem, Minist Educ, Sch Chem & Mat Sci,Int Joint Res Ctr Catalyt Tech, Harbin 150080, Peoples R China

来源：

CHEMSUSCHEM | 2020年 / 13卷 / 14期

基金：

中国国家自然科学基金;

关键词：

electron transfer; Mg-O bridge; photocatalysis; nanocomposite; water splitting; CARBON NITRIDE; H-2; EVOLUTION; WATER; PERFORMANCE; COMPOSITES; PHOTOCATALYSTS; NANOPARTICLES; DEGRADATION; NANOSHEETS; OXIDATION;

D O I：

10.1002/cssc.202000280

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

It is highly desired to improve the visible-light activity of g-C3N4 for H-2 evolution by constructing closely contacted heterojunctions with conductive polymers. Herein, a polymer nanocomposite photocatalyst with high visible-light activity is fabricated successfully by coupling nanosized polypyrrole (NPPy) particles onto g-C3N4 nanosheets through a simple wet-chemical process, and its visible-light activity is improved further by constructing Mg-O bridges between the NPPy and g-C3N4. The amount-optimized bridged nanocomposite displays an approximately ninefold improvement in visible-light activity compared with g-C3N4. On the basis of transient-state surface photovoltage responses, photoluminescence spectra, (OH)-O-. amount evaluation, and photoelectrochemical curves, it is concluded that the exceptional photoactivity can be attributed to the significantly promoted charge transfer and separation along with visible photosensitization from NPPy. Interestingly, it is confirmed that the promoted charge separation depends mainly on the excited high-level electron transfer from g-C3N4 to NPPy by single-wavelength photocurrent action spectra. This work provides a feasible strategy for designing polymer nano-heterojunction photocatalysts with exceptional visible-light activities.

引用

页码：3707 / 3717

页数：11

共 68 条

[31] g-C3N4 Hydrogen-Bonding Viologen for Significantly Enhanced Visible-Light Photocatalytic H2 Evolution [J].