Edge-oriented, high-percentage 1T′-phase MoS2 nanosheets stabilize Ti3C2 MXene for efficient electrocatalytic hydrogen evolution

被引：146
作者：
Li, Xitao [1 ,2 ]
Lv, Xinding [1 ]
Sun, Xiangnan [1 ]
Yang, Chen [3 ]
Zheng, Yan-Zhen [2 ]
Yang, Lihui [4 ]
Li, Siqi [1 ]
Tao, Xia [1 ]
机构：
[1] Beijing Univ Chem Technol, State Key Lab Organ Inorgan Composites, 15 Beisanhuan East Rd, Beijing 100029, Peoples R China
[2] Beijing Univ Chem Technol, Minist Educ High Grav Engn & Technol, Res Ctr, 15 Beisanhuan East Rd, Beijing 100029, Peoples R China
[3] Shanghai Inst Space Power Sources, 2695 Dongchuan Rd, Shanghai 200245, Peoples R China
[4] Chinese Acad Sci, Inst Oceanol, Shandong Key Lab Corros Sci, Beijing, Peoples R China
来源：
APPLIED CATALYSIS B-ENVIRONMENTAL | 2021年 / 284卷
基金：
中国国家自然科学基金;
关键词：
High-percentage 1T '-phase; Edge orientation; MoS2; nanosheets; Stabilized MXenes; Hydrogen evolution reaction;
D O I：
10.1016/j.apcatb.2020.119708
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
Abundant electrochemical active sites, high electronic conductivity as well as stable structure and electrochemical activity are indispensable but usually incompatible to the ideal electrocatalysts for hydrogen evolution reaction (HER). Herein, an efficient and stable MoS2-Ti3C2 MXene electrocatalyst is synthesized using a delicately designed one-step hydrothermal method, in which the few-layers thick, edge-oriented, high-percentage 1T'phase (similar to 85.0 %) MoS2 nanosheets are well grown on the cation-modified Ti3C2 MXene and stabilize Ti3C2 MXene against spontaneous oxidation caused by dissolved-oxygen. The structure and phase engineering of MoS2 as well as the fully surface-shielding Ti3C2 MXene endow the as-synthesized MoS2-Ti3C2 MXene electrocatalyst with a wealth of accessible active sites and high electrical conductivity for HER together with excellent structure stability. Consequently, the as-synthesized MoS2-Ti3C2 MXene exhibits remarkable electrocatalytic HER performance in acidic medium with a low overpotential of 98 mV at 10 mA cm(-2), a depressed Tafel slope of 45 mV dec(-1) and a low electrochemical resistance.
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页数：11
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