期刊
CARBON
卷 145, 期 -, 页码 521-528出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.carbon.2019.01.065
关键词
N-doped carbon layer; Nickel-cobalt sulfide; High electrocatalytic activity; Overall water splitting
资金
- NSFC [21477136]
- Beijing Natural Science Foundation [2182077]
- Strategic Priority Research Program of the Chinese Academy of Sciences [XDB17030300]
Great attention has been focused on exploration of noble-metal free electrocatalysts to enable electrochemical water splitting for the process of the electricity-to-hydrogen energy conversion. The Ni-Co based catalyst (NiCo2S4) contains the redox couples of Co3+/Co2+ and Ni3+/Ni2+ which are effective active centers for HER and OER, however, the high overpotential, delayed dynamics and inferior stability suppress their whole water splitting activity and stability application. Herein, N-doped carbon layer coated NiCo2S4 hollow nanotubes (NCT-NiCo2S4) were prepared by simple solvothermal method using polyacrylonitrite (PAN) as template. The carbon layer coated hollow nanotube structure not only maximized the catalytic active sites, facilitated mass transfer rate but also protected from electrolyte corrosion to improve the activity and stability. The optimized catalyst presented low overpotentials of 295 and 330 mV to drive the 100mA cm(-2) for HER and OER, respectively, meanwhile maintaining the remarkable stability. The small Tafel slope also reflects the high electrocatalytic reaction kinetic for HER and OER. When assembled in an electrolyzer as catalyst for water splitting, it only needs a cell voltage of 1.6 V at current density of 10 mAcm(-2). This work sheds some light on the rational design of functional materials for energy chemistry. (c) 2019 Elsevier Ltd. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据