Unconventional CN vacancies suppress iron-leaching in Prussian blue analogue pre-catalyst for boosted oxygen evolution catalysis

Zi-You Yu, Yu Duan, Jian-Dang Liu, Yu Chen, Xiao-Kang Liu, Wei Liu, Tao Ma, Yi Li, Xu-Sheng Zheng, Tao Yao, Min-Rui Gao (), Jun-Fa Zhu, Bang-Jiao Ye and Shu-Hong Yu ()
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Zi-You Yu: University of Science and Technology of China
Yu Duan: University of Science and Technology of China
Jian-Dang Liu: University of Science and Technology of China
Yu Chen: University of Science and Technology of China
Xiao-Kang Liu: University of Science and Technology of China
Wei Liu: University of Science and Technology of China
Tao Ma: University of Science and Technology of China
Yi Li: University of Science and Technology of China
Xu-Sheng Zheng: University of Science and Technology of China
Tao Yao: University of Science and Technology of China
Min-Rui Gao: University of Science and Technology of China
Jun-Fa Zhu: University of Science and Technology of China
Bang-Jiao Ye: University of Science and Technology of China
Shu-Hong Yu: University of Science and Technology of China

Nature Communications, 2019, vol. 10, issue 1, 1-9

Abstract: Abstract The incorporation of defects, such as vacancies, into functional materials could substantially tailor their intrinsic properties. Progress in vacancy chemistry has enabled advances in many technological applications, but creating new type of vacancies in existing material system remains a big challenge. We show here that ionized nitrogen plasma can break bonds of iron-carbon-nitrogen-nickel units in nickel-iron Prussian blue analogues, forming unconventional carbon-nitrogen vacancies. We study oxygen evolution reaction on the carbon-nitrogen vacancy-mediated Prussian blue analogues, which exhibit a low overpotential of 283 millivolts at 10 milliamperes per square centimeter in alkali, far exceeding that of original Prussian blue analogues and previously reported oxygen evolution catalysts with vacancies. We ascribe this enhancement to the in-situ generated nickel-iron oxy(hydroxide) active layer during oxygen evolution reaction, where the Fe leaching was significantly suppressed by the unconventional carbon-nitrogen vacancies. This work opens up opportunities for producing vacancy defects in nanomaterials for broad applications.

Date: 2019
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DOI: 10.1038/s41467-019-10698-9

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