Janus-Structured Co-Ti3C2 MXene Quantum Dots as a Schottky Catalyst for High-Performance Photoelectrochemical Water Oxidation

被引：127

作者：

Tang, Rui ^{[1
]}

Zhou, Shujie ^{[1
]}

Li, Caixia ^{[1
]}

Chen, Ran ^{[1
]}

Zhang, Luyuan ^{[1
]}

Zhang, Zhiwei ^{[1
]}

Yin, Longwei ^{[1
]}

机构：

[1] Shandong Univ, Key Lab Liquid Solid Struct Evolut & Proc Mat, Minist Educ, Sch Mat Sci & Engn, Jinan 250061, Peoples R China

来源：

ADVANCED FUNCTIONAL MATERIALS | 2020年 / 30卷 / 19期

基金：

中国国家自然科学基金;

关键词：

Janus particles; MXene; quantum dots; Schottky catalysts; water oxidation; CHARGE SEPARATION; HYDROGEN; NANOPARTICLES; NANOWIRES; HETEROSTRUCTURE; HETEROJUNCTION; PHOTOANODES; CAPACITY; FILMS; SIZE;

D O I：

10.1002/adfm.202000637

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

MXene materials have attracted increasing attention in electrochemical energy-storage applications while MXene also becomes photo-active at the quantum dot scale, making it an alternative for solar-energy-conversion devices. A Janus-structured cobalt-nanoparticle-coupled Ti3C2 MXene quantum dot (Co-MQD) Schottky catalyst with tunable cobalt-loading content serving as a photoelectrochemical water oxidation photoanode is demonstrated. The introduction of cobalt triggers concomitant surface-plasmon effects and acts as a water oxidation center, enabling visible-light harvesting capability and improving surface reaction kinetics. Most importantly, due to the rectifying effects of Co-MQD Schottky junctions, photogenerated carrier separation/injection efficiency can be fundamentally facilitated. Specifically, Co-MQD-48 exhibits both superior photoelectrocatalysis (2.99 mA cm(-2) at 1.23 V vs RHE) and charge migration performance (87.56%), which corresponds to 194% and 236% improvement compared with MQD. Furthermore, excellent photostability can be achieved with less than 6.6% loss for 10 h cycling reaction. This fills in gaps in MXene material research in photoelectrocatalysis and allows for the extension of MXene into optical-related fields.

引用

页数：11

共 53 条

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