Complementary combinative strategy of defect engineering and graphene coupling for efficient energy-functional materials

Minji Kim; Yeon Hu Park; Myung Hwa Kim; Xiaoyan Jin; Seong Ju Hwang

doi:10.1002/asia.202101013

Complementary combinative strategy of defect engineering and graphene coupling for efficient energy-functional materials

Minji Kim, Yeon Hu Park, Myung Hwa Kim, Xiaoyan Jin, Seong Ju Hwang

Department of Chemistry & Nanoscience

Research output: Contribution to journal › Article › peer-review

3 Scopus citations

Abstract

The synergetic combination of defect engineering and graphene coupling enables to develop an effective way of exploring efficient bifunctional electrocatalyst/electrode materials. Defect-engineered amorphous MoO₂-reduced graphene oxide (rGO) nanohybrid was synthesized by soft-chemical reduction of K₂MoO₄ in graphene oxide colloids. Mo K-edge X-ray absorption spectroscopy clearly demonstrates the rutile-type local atomic structure of amorphous MoO₂ with significant oxygen vacancies and intimate electronic coupling with rGO. The defect-introduced MoO₂-rGO nanohybrid shows excellent bifunctionality as electrocatalyst for hydrogen evolution reaction and electrode for sodium-ion batteries, which are superior to those of crystalline MoO₂-rGO homologue. The beneficial effect of simultaneous defect control and rGO coupling can be ascribed to the provision of oxygen vacancies acting as active sites, the increase of electrical conductivity, and the improvement of reaction kinetics.

Original language	English
Pages (from-to)	3937-3943
Number of pages	7
Journal	Chemistry - An Asian Journal
Volume	16
Issue number	23
DOIs	https://doi.org/10.1002/asia.202101013
State	Published - 1 Dec 2021

Bibliographical note

Funding Information:
This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIT) (No. NRF‐2020R1A2C3008671, No. NRF‐2017R1A5A1015365). This work was also supported by National R&D Program through the National Research Foundation of Korea (NRF) funded by Ministry of Science and ICT (No. 2021M3H4A1A03049662). The experiments at PAL were supported in part by MOST and POSTECH.

Publisher Copyright:
© 2021 Wiley-VCH GmbH

Keywords

amorphous nanocrystal
defect engineering
graphene
hydrogen evolution electrocatalyst
sodium ion batteries

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title = "Complementary combinative strategy of defect engineering and graphene coupling for efficient energy-functional materials",

abstract = "The synergetic combination of defect engineering and graphene coupling enables to develop an effective way of exploring efficient bifunctional electrocatalyst/electrode materials. Defect-engineered amorphous MoO2-reduced graphene oxide (rGO) nanohybrid was synthesized by soft-chemical reduction of K2MoO4 in graphene oxide colloids. Mo K-edge X-ray absorption spectroscopy clearly demonstrates the rutile-type local atomic structure of amorphous MoO2 with significant oxygen vacancies and intimate electronic coupling with rGO. The defect-introduced MoO2-rGO nanohybrid shows excellent bifunctionality as electrocatalyst for hydrogen evolution reaction and electrode for sodium-ion batteries, which are superior to those of crystalline MoO2-rGO homologue. The beneficial effect of simultaneous defect control and rGO coupling can be ascribed to the provision of oxygen vacancies acting as active sites, the increase of electrical conductivity, and the improvement of reaction kinetics.",

keywords = "amorphous nanocrystal, defect engineering, graphene, hydrogen evolution electrocatalyst, sodium ion batteries",

author = "Minji Kim and Park, {Yeon Hu} and Kim, {Myung Hwa} and Xiaoyan Jin and Hwang, {Seong Ju}",

note = "Funding Information: This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIT) (No. NRF‐2020R1A2C3008671, No. NRF‐2017R1A5A1015365). This work was also supported by National R&D Program through the National Research Foundation of Korea (NRF) funded by Ministry of Science and ICT (No. 2021M3H4A1A03049662). The experiments at PAL were supported in part by MOST and POSTECH. Publisher Copyright: {\textcopyright} 2021 Wiley-VCH GmbH",

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N1 - Funding Information: This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIT) (No. NRF‐2020R1A2C3008671, No. NRF‐2017R1A5A1015365). This work was also supported by National R&D Program through the National Research Foundation of Korea (NRF) funded by Ministry of Science and ICT (No. 2021M3H4A1A03049662). The experiments at PAL were supported in part by MOST and POSTECH. Publisher Copyright: © 2021 Wiley-VCH GmbH

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N2 - The synergetic combination of defect engineering and graphene coupling enables to develop an effective way of exploring efficient bifunctional electrocatalyst/electrode materials. Defect-engineered amorphous MoO2-reduced graphene oxide (rGO) nanohybrid was synthesized by soft-chemical reduction of K2MoO4 in graphene oxide colloids. Mo K-edge X-ray absorption spectroscopy clearly demonstrates the rutile-type local atomic structure of amorphous MoO2 with significant oxygen vacancies and intimate electronic coupling with rGO. The defect-introduced MoO2-rGO nanohybrid shows excellent bifunctionality as electrocatalyst for hydrogen evolution reaction and electrode for sodium-ion batteries, which are superior to those of crystalline MoO2-rGO homologue. The beneficial effect of simultaneous defect control and rGO coupling can be ascribed to the provision of oxygen vacancies acting as active sites, the increase of electrical conductivity, and the improvement of reaction kinetics.

AB - The synergetic combination of defect engineering and graphene coupling enables to develop an effective way of exploring efficient bifunctional electrocatalyst/electrode materials. Defect-engineered amorphous MoO2-reduced graphene oxide (rGO) nanohybrid was synthesized by soft-chemical reduction of K2MoO4 in graphene oxide colloids. Mo K-edge X-ray absorption spectroscopy clearly demonstrates the rutile-type local atomic structure of amorphous MoO2 with significant oxygen vacancies and intimate electronic coupling with rGO. The defect-introduced MoO2-rGO nanohybrid shows excellent bifunctionality as electrocatalyst for hydrogen evolution reaction and electrode for sodium-ion batteries, which are superior to those of crystalline MoO2-rGO homologue. The beneficial effect of simultaneous defect control and rGO coupling can be ascribed to the provision of oxygen vacancies acting as active sites, the increase of electrical conductivity, and the improvement of reaction kinetics.

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Complementary combinative strategy of defect engineering and graphene coupling for efficient energy-functional materials

Abstract

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Keywords

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