过电位
析氧
双金属片
材料科学
金属有机骨架
电化学
层状双氢氧化物
催化作用
电催化剂
镍
纳米技术
分解水
化学工程
金属
化学
电极
光催化
有机化学
冶金
物理化学
吸附
工程类
作者
Yizhe Liu,Xintong Li,Qidi Sun,Zilong Wang,Wei‐Hsiang Huang,Xuyun Guo,Zhanxi Fan,Ruquan Ye,Ye Zhu,Chu‐Chen Chueh,Chyi‐Liang Chen,Zonglong Zhu
出处
期刊:Small
[Wiley]
日期:2022-05-31
卷期号:18 (26)
被引量:23
标识
DOI:10.1002/smll.202201076
摘要
The oxygen evolution reaction (OER) is crucial to electrochemical hydrogen production. However, designing and fabricating efficient electrocatalysts still remains challenging. By confinedly coordinating organic ligands with metal species in layered double hydroxides (LDHs), an innovative LDHs-assisted approach is developed to facilely synthesize freestanding bimetallic 2D metal-organic framework nanosheets (2D MOF NSs), preserving the metallic components and activities in OER. Furthermore, the research has demonstrated that the incorporation of carboxyl organic ligands coordinated with metal atoms as proton transfer mediators endow 2D MOF NSs with efficient proton transfer during the electrochemical OHads → Oads transition. These freestanding NiFe-2D MOF NSs require a small overpotential of 260 mV for a current density of 10 mA cm-2 . When this strategy is applied to LDH nanosheets grown on nickel foam, the overpotential can be reduced to 221 mV. This outstanding OER activity supports the capability of multimetallic organic frameworks for the rational design of water oxidation electrocatalysts. This strategy provides a universal path to the synthesis of 2D MOF NSs that can be used as electrocatalysts directly.
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