期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 60, 期 9, 页码 4640-4647出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202014331
关键词
electroconversion; nickel germanide; oxygen evolution reaction; oxyhydroxide; renewable energy
资金
- Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) under Germany's Excellence Strategy [EXC 2008/1-390540038-UniSysCat]
- Einstein Foundation Berlin [EC2/BIG-NSE]
- Projekt DEAL
In this study, intermetallic nickel germanide (NiGe) was identified as a superior Ni-based electro(pre)catalyst for the oxygen evolution reaction (OER) with enhanced catalytic activity and durability. Compared to other Ni-based intermetallic precatalysts under alkaline OER conditions, NiGe showed unexpected electroconversion into gamma-(NiOOH)-O-III with intercalated OH-/CO32- that served as a highly active structure.
Identifying novel classes of precatalysts for the oxygen evolution reaction (OER by water oxidation) with enhanced catalytic activity and stability is a key strategy to enable chemical energy conversion. The vast chemical space of intermetallic phases offers plenty of opportunities to discover OER electrocatalysts with improved performance. Herein we report intermetallic nickel germanide (NiGe) acting as a superior activity and durable Ni-based electro(pre)catalyst for OER. It is produced from a molecular bis(germylene)-Ni precursor. The ultra-small NiGe nanocrystals deposited on both nickel foam and fluorinated tin oxide (FTO) electrodes showed lower overpotentials and a durability of over three weeks (505 h) in comparison to the state-of-the-art Ni-, Co-, Fe-, and benchmark NiFe-based electrocatalysts under identical alkaline OER conditions. In contrast to other Ni-based intermetallic precatalysts under alkaline OER conditions, an unexpected electroconversion of NiGe into gamma-(NiOOH)-O-III with intercalated OH-/CO32- transpired that served as a highly active structure as shown by various ex situ methods and quasi in situ Raman spectroscopy.
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