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Issue 2, 2018
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Unlocking the potential of graphene for water oxidation using an orbital hybridization strategy

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Abstract

Graphene-based electrocatalytic materials are potential low-cost electrocatalysts for the oxygen evolution reaction (OER). However, substantial overpotentials above thermodynamic requirements limit their efficiency and stability in OER-related energy conversion and storage technologies. Here, we embedded CrN crystals into graphene and in situ electrochemically oxidized them to construct graphene materials with encapsulated Cr6+ ions (Cr6+@G). These Cr6+@G materials exhibit the lowest OER overpotential of 197 mV at 10 mA cm−2 and excellent stability over 200 h at a high current density of about 120 mA cm−2 in an alkaline electrolyte. Spectroscopic and computational studies confirm a stable ion coordination environment significantly benefiting the downshift of the graphene Fermi level via hybridization of C p orbitals with d orbitals of Cr6+ ions that enhances the OER activity and stability.

Graphical abstract: Unlocking the potential of graphene for water oxidation using an orbital hybridization strategy

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Supplementary files

Article information


Submitted
16 Oct 2017
Accepted
04 Jan 2018
First published
04 Jan 2018

Energy Environ. Sci., 2018,11, 407-416
Article type
Paper

Unlocking the potential of graphene for water oxidation using an orbital hybridization strategy

Y. Yao, Z. Xu, F. Cheng, W. Li, P. Cui, G. Xu, S. Xu, P. Wang, G. Sheng, Y. Yan, Z. Yu, S. Yan, Z. Chen and Z. Zou, Energy Environ. Sci., 2018, 11, 407
DOI: 10.1039/C7EE02972A

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