期刊
CHEMSUSCHEM
卷 11, 期 18, 页码 3150-3156出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cssc.201801547
关键词
electrochemistry; nanostructures; oxygen evolution; surface science; water oxidation
资金
- DFG [GSC 1070]
- BMBF [03EK3552]
High-performance catalysts for the oxygen-evolution reaction in water electrolysis are usually based on expensive and rare elements. Herein, mixed-metal borides are shown to be competitive with established electrocatalysts like noble metal oxides and other transition-metal(oxide)-based catalysts. Iron incorporation into nanoscale dicobalt boride results in excellent activity and stability in alkaline solutions. (Co0.7Fe0.3)(2)B shows an overpotential of =0.33V (1.56V vs. RHE) at 10mAcm(-2) in 1m KOH with a very low onset potential of approximate to 1.5V vs. RHE, comparable to the performance of IrO2 and RuO2. XPS shows that the original catalyst is modified under the reaction conditions and indicates that CoOOH and Co(OH)(2) are formed as active surface species, whereas the Fe remains in the catalyst, contributing to an improved catalyst performance. The nanoscale borides are obtained by a one-step solution synthesis, calcined, and characterized by XRD, energy-dispersive X-ray spectroscopy, and SEM. Single crystals of (Co1-xFex)(2)B grown under chemical transport conditions were used for an unambiguous specification of the nanostructured particles by relating the cobalt/iron ratio to the lattice parameters.
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