Micropore-Boosted Layered Double Hydroxide Catalysts: EIS Analysis in Structure and Activity for Effective Oxygen Evolution Reactions

ACS Applied Materials & Interfaces
Cui YeChanghui Ye

Abstract

Since the oxygen evolution catalysis process is vital yet arduous in energy conversion and storage devices, it is highly desirous but extremely challenging to engineer earth-abundant, noble-metal-free nanomaterials with superior electrocatalytic activity toward effective oxygen evolution reactions (OERs). Herein, we construct a prismlike cobalt-iron layered double hydroxide (Co-Fe LDH) with a Co/Fe ratio of 3:1 utilizing a facile self-templated strategy. Instead of carbon-species-coupled treatment, we focus on ameliorating the intrinsic properties of LDHs as OER electrocatalysts accompanied by the hierarchical nanoflake shell, well-defined interior cavity, and numerous microporous defects. In contrary to conventional LDHs synthesized via a one-pot method, Co-Fe LDHs fabricated in this work possess a huge specific surface area up to 294.1 m2 g-1, which not only provides abundant active sites but also expedites the kinetics of the OER process. The as-prepared Co-Fe LDH electrocatalysts exhibit advanced electrocatalytic performance and a dramatic stability of the OER in an alkaline environment. In particular, the contribution of micropore defects is clearly discussed according to the electrochemical impedance spectroscopy analysis...Continue Reading

References

Jan 14, 2017·Chemical Society Reviews·Nian-Tzu SuenHao Ming Chen
Jan 28, 2017·Accounts of Chemical Research·Le YuXiong Wen David Lou
Apr 26, 2017·Science Advances·Pengzhan SunTakayoshi Sasaki
Aug 10, 2017·Journal of the American Chemical Society·Michaela Burke StevensShannon W Boettcher
Sep 19, 2017·Advanced Materials·Jianwei NaiXiong Wen David Lou
Apr 9, 2019·Angewandte Chemie·Yongjin FangXiong Wen David Lou

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