Layered Structure Causes Bulk NiFe Layered Double Hydroxide Unstable in Alkaline Oxygen Evolution Reaction

Rong Chen, Sung Fu Hung, Daojin Zhou, Jiajian Gao, Cangjie Yang, Huabing Tao, Hong Bin Yang, Liping Zhang, Lulu Zhang, Qihua Xiong, Hao Ming Chen, Bin Liu*

*此作品的通信作者

研究成果: Article同行評審

200 引文 斯高帕斯(Scopus)

摘要

NiFe-based layered double hydroxides (LDHs) are among the most efficient oxygen evolution reaction (OER) catalysts in alkaline medium, but their long-term OER stabilities are questionable. In this work, it is demonstrated that the layered structure makes bulk NiFe LDH intrinsically not stable in OER and the deactivation mechanism of NiFe LDH in OER is further revealed. Both operando electrochemical and structural characterizations show that the interlayer basal plane in bulk NiFe LDH contributes to the OER activity, and the slow diffusion of proton acceptors (e.g., OH) within the NiFe LDH interlayers during OER causes dissolution of NiFe LDH and therefore decrease in OER activity with time. To improve diffusion of proton acceptors, it is proposed to delaminate NiFe LDH into atomically thin nanosheets, which is able to effectively improve OER stability of NiFe LDH especially at industrial operating conditions such as elevated operating temperatures (e.g., at 80 °C) and large current densities (e.g., at 500 mA cm−2).

原文English
文章編號1903909
期刊Advanced Materials
31
發行號41
DOIs
出版狀態Published - 1 10月 2019

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