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Nitrogen-doped graphene quantum dots anchored on NiFe layered double-hydroxide nanosheets catalyze the oxygen evolution reaction

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Abstract

The design and synthesis of efficient, durable, low-cost catalysts are vital for the oxygen evolution reaction (OER) because it is an important process in energy conversion and storage. Here, we describe the use of a simple hydrothermal process to successfully synthesize novel nitrogen-doped graphene quantum dots (N-GQDs) anchored on NiFe layered double hydroxide sheets (N-GQDs/NiFe-LDH). Structural, morphological, and crystalline phase characteristics were confirmed by applying SEM, TEM, XPS, and XRD studies. These analyses clearly showed the formation of the N-GQDs/NiFe-LDH composite with a hierarchical nanosheet structure possessing higher surface area values and a wide range of pores (10–180 nm). Further study showed that the as-prepared N-GQDs/NiFe-LDH composite exhibited excellent electrocatalytic activity for the OER in alkaline solution, affording small overpotential of 279 and 300 mV at current densities of 20 and 50 mA cm−2, respectively, a low Tafel slope of 47 mV dec−1, and satisfactory stability. The outstanding reactive kinetics outperformed those of most previously reported transition-metal-based catalysts. The excellent OER catalytic activity for the N-GQDs/NiFe-LDH composite is attributed to the synergistic effect of the N-GQDs and NiFe-LDH, the existence of pyridinic-N and graphitic-N on the N-GQDs, and the hierarchical nanosheet and its porous structure. This work provides a new strategy for designing and fabricating novel carbon-based LDH composites.

Graphical abstract: Nitrogen-doped graphene quantum dots anchored on NiFe layered double-hydroxide nanosheets catalyze the oxygen evolution reaction

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Supplementary files

Article information


Submitted
16 Jul 2020
Accepted
15 Sep 2020
First published
17 Sep 2020

New J. Chem., 2020, Advance Article
Article type
Paper

Nitrogen-doped graphene quantum dots anchored on NiFe layered double-hydroxide nanosheets catalyze the oxygen evolution reaction

Q. Dong, C. Shuai, Z. Mo, Z. Liu, G. Liu, J. Wang, Y. Chen, W. Liu, N. Liu and R. Guo, New J. Chem., 2020, Advance Article , DOI: 10.1039/D0NJ03537H

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