Preparation of CoP/Co@NPC@rGO nanocomposites with an efficient bifunctional electrocatalyst for hydrogen evolution and oxygen evolution reaction

HUANG Kang; ZHU Mei-ting; ZHANG Fei-peng; XU Zhi-long; WANG Hong-tao; XIAO Kui; WU Jun-sheng

Jun 2021

Article Contents

JOURNAL OF MECHANICAL ENGINEERING > 2018 > 4(6): 107-115.

HUANG Kang, ZHU Mei-ting, ZHANG Fei-peng, XU Zhi-long, WANG Hong-tao, XIAO Kui, WU Jun-sheng. Preparation of CoP/Co@NPC@rGO nanocomposites with an efficient bifunctional electrocatalyst for hydrogen evolution and oxygen evolution reaction[J]. JOURNAL OF MECHANICAL ENGINEERING, 2018, 4(6): 107-115.

Citation:

HUANG Kang, ZHU Mei-ting, ZHANG Fei-peng, XU Zhi-long, WANG Hong-tao, XIAO Kui, WU Jun-sheng. Preparation of CoP/Co@NPC@rGO nanocomposites with an efficient bifunctional electrocatalyst for hydrogen evolution and oxygen evolution reaction[J]. JOURNAL OF MECHANICAL ENGINEERING, 2018, 4(6): 107-115.

Citation:

HUANG Kang, ZHU Mei-ting, ZHANG Fei-peng, XU Zhi-long, WANG Hong-tao, XIAO Kui, WU Jun-sheng. Preparation of CoP/Co@NPC@rGO nanocomposites with an efficient bifunctional electrocatalyst for hydrogen evolution and oxygen evolution reaction[J]. JOURNAL OF MECHANICAL ENGINEERING, 2018, 4(6): 107-115.

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Preparation of CoP/Co@NPC@rGO nanocomposites with an efficient bifunctional electrocatalyst for hydrogen evolution and oxygen evolution reaction

1.
Institute of Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083, China
2.
Department of Materials Science and Engineering, Tianjin College, University of Science and Technology Beijing, Tianjin 301830, China

More Information

Corresponding author: WU Jun-sheng, E-mail: wujs@ustb.edu.cn
Received Date: 26 Jul 2019
Issue Publish Date: 06 Nov 2018

Abstract

Abstract

The construction of the highly active transition-metal phosphide/carbon-based electrocatalyst from metal-organic frameworks (MOFs) precursors is considered as an efficient approach. In this work, ZIF-67/GO precursors were firstly obtained by the in situ controllable growth of ZIF-67 nanocrystals on both surfaces of GO sheets. Then, a highly efficient bifunctional electrocatalyst CoP/Co@NPC@rGO nanocomposite was derived by the thermal pyrolysis of ZIF-67/GO precursors under N₂ atmosphere and a subsequent phosphatization process. The structure and elemental composition of the ZIF-67/GO, Co@NPC@rGO, and CoP/Co@NPC@rGO nanocomposites were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), Raman spectroscopy, and N₂ ad-/desorption isotherms analysis. The Co@NPC@rGO‒800 nanocomposite exhibits a high Brunauer-Emmett-Teller (BET) surface area of 186.27 m²·g^‒1, indicating that both micropores and mesopores existed. Subsequently, the electrocatalytic properties of the CoP/Co@NPC@rGO nanocomposites for hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) were investigated by electrochemical measurements. The results suggest that the obtained CoP/Co@NPC@rGO‒350 nanocomposite only requires an overpotential of 127 mV to reach a current density of 10 mA·cm^‒2 for HER in 1.0 mol·L^–1 KOH solution. For OER, CoP/Co@NPC@rGO‒350 nanocomposite can reach a current density of 10 mA·cm^‒2 at an overpotential of 276 mV, with a Tafel slope of 42 mV·dec⁻¹, in the same alkaline aqueous solution, which is superior to RuO₂. In addition, for both HER and OER, CoP/Co@NPC@rGO‒350 nanocomposite also shows impressive strong durability in alkaline aqueous solution. The outstanding performance can be attributed to the synergistic effect of coupled highly graphitized N-doped porous carbon and N-doped graphene. The as-prepared CoP/Co@NPC@rGO‒350 electrocatalyst is a promising candidate for overall water splitting in the alkaline solution. This development offers an attractive catalyst material based on MOF/GO composites. It is expected that the presented strategy can be extended to the fabrication of other composites electrode materials for more efficient water splitting.
- graphene oxide,
- electrocatalysis,
- hydrogen evolution reaction (HER),
- oxygen evolution reaction (OER),
- ZIF-67

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References(32)

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