期刊
CHEMISTRY-A EUROPEAN JOURNAL
卷 24, 期 52, 页码 13773-13777出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.201803165
关键词
chemical stability; electrocatalysis; NiFe LDH; oxygen evolution reaction; water splitting
资金
- Deutsche Forschungsgemeinschaft (DFG) [EXC1069]
- BMBF [FKZ 03SF0497B, FKZ 03EK3548]
- Fond der Chemischen Industrie
NiFe layered double hydroxide (LDH) is inarguably the most active contemporary catalyst for the oxygen evolution reaction under alkaline conditions. However, the ability to sustain unattenuated performance under challenging industrial conditions entailing high corrosivity of the electrolyte (approximate to 30wt.% KOH), high temperature (>80 degrees C) and high current densities (>500mAcm(-2)) is the ultimate criterion for practical viability. This work evaluates the chemical and structural stability of NiFe LDH at conditions akin to practical electrolysis, in 30% KOH at 80 degrees C, however, without electrochemical polarization, and the resulting impact on the OER performance of the catalyst. Post-analysis of the catalyst by means of XRD, TEM, FT-IR, and Raman spectroscopy after its immersion into 7.5m KOH at 80 degrees C for 60h revealed a transformation of the structure from NiFe LDH to a mixture of crystalline -Ni(OH)(2) and discrete predominantly amorphous FeOOH containing minor non-homogeneously distributed crystalline domains. These structural and compositional changes led to a drastic loss of the OER activity. It is therefore recommended to study catalyst stability at industrially relevant conditions.
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