期刊
JOURNAL OF ENERGY CHEMISTRY
卷 70, 期 -, 页码 472-479出版社
ELSEVIER
DOI: 10.1016/j.jechem.2022.02.044
关键词
Bifunctional electrocatalyst; MXene; Layered double hydroxide; Lanthanum; Overall water splitting
资金
- National Natural Science Foundation of China (NSFC) [51772040]
- Doctoral Startup Foundation of Dalian University [1201012]
This study presents a novel strategy for engineering water splitting electrocatalysts in alkaline electrolytes by coupling La-doped NiFe-layered double hydroxides (NiFe-LDH) nanosheets with MXene nanosheets. The resulting electrocatalyst exhibits enhanced performance due to the synergy of strong electronic interaction among multiple metal centers and vertically aligned porous MXene. It achieves significantly reduced overpotentials for both HER and OER, along with excellent durability.
The development of stable electrocatalysts with high hydrogen and oxygen evolution reactions (HER and OER) activity in alkaline electrolytes is critical to renewable energy conversion technologies, such as electrochemical water splitting. In this work, a novel strategy for engineering water splitting electrocatalysts in alkaline electrolyte was developed by synergistically coupling La-doped NiFe-layered double hydroxides (NiFe-LDH) nanosheets onto three-dimensional (3D) vertically aligned MXene nanosheets on macroporous nickel foam (NF) substrates (NiFeLa-LDH/v-MXene/NF). The electrocatalytic performance of the prepared NiFeLa-LDH/v-MXene/NF is enhanced by the synergy of strong electronic interaction among multiple metal centers and unique vertically aligned porous MXene with increased active surface area, accelerated reaction kinetics and improved water adsorption and dissociation ability. To reach the commercially required current density (500 mA cm-2), the NiFeLa-LDH/v-MXene/NF exhibits greatly reduced overpotentials of 233 and 255 mV for HER and OER, respectively, along with excellent durability. Moreover, an alkaline electrolyzer driven by NiFeLa-LDH/v-MXene/NF delivers a lower cell voltage (1.71 V) compared with that of Pt/C-RuO2 couple to achieve the current density of 500 mA cm-2. CO 2022 Science Press and Dalian Institute of Chemical Physics, Chinese Academy of Sciences. Published by ELSEVIER B.V. and Science Press. 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