期刊
SMALL
卷 16, 期 5, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.201905328
关键词
charge transfer; lattice doping; layered double hydroxides; oxygen evolution reaction; single atoms
类别
资金
- National Key R&D Program of China [2016YFB0901600]
- Science and Technology Commission of Shanghai [16JC1401700]
- Key Research Program of Chinese Academy of Sciences [QYZDJ-SSW-JSC013, KGZD-EW-T06]
Exploring the origin of transition metal (TM) lattice-doped layered double hydroxides (LDHs) toward the oxygen evolution reaction (OER) plays a crucial role in engineering efficient electrocatalysts. Without understanding the physics behind the TM-induced catalytic enhancements, it would be challenging to design the next generation of electrocatalysts. Herein, single Ru atoms are introduced into a CoCr LDHs lattice to improve activity. In 0.1 m KOH, CoCrRu LDHs require only 290 mV overpotential to drive to 10 mA cm(-2) and show a Tafel slope of 56.12 mV dec(-1). Electronic structure analyses based on density functional theory confirm that promoted OER activity originates from synergetic charge transfer among Ru, Cr, and Co elements. Specifically, Ru dopants can downshift d states of Co and enhance electron donation of Cr to oxygenates, which essentially breaks the scaling relation and achieves higher activity. This work provides insights into how single atomic Ru dopant tunes the electronic structures of its neighbor's active site Co and thus increases OER activities.
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