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. 2019 Feb 22;9(12):6444-6451.
doi: 10.1039/c8ra10286d.

Enhanced oxygen evolution reaction on amine functionalized graphene oxide in alkaline medium

Vijay S Sapner  1 , Balaji B Mulik  1 , Renuka V Digraskar  1 , Shankar S Narwade  1 , Bhaskar R Sathe  1
Affiliations

Enhanced oxygen evolution reaction on amine functionalized graphene oxide in alkaline medium

Vijay S Sapner et al. RSC Adv. .

Abstract

Development of highly efficient oxygen evolution reaction (OER) electrocatalysts is a critical challenge in the cost-effective generation of clean fuels. Here, a metal-free tyramine functionalized graphene oxide (T-GO) electrocatalyst is proposed to use in alkaline electrolytes for enhanced OER. Moreover, the T-GO and GO nanomaterials are well characterized by SEM, XRD, FTIR, XPS and Raman spectroscopy. T-GO exhibits an electrocatalytic OER with a current density of 2 mA cm-2 at a low onset potential of ∼1.39 V and a small Tafel slope of about 69 mV dec-1 and GO exhibits an onset potential of 1.51 V and Tafel slope of about 92 mV dec-1. Additionally, the current stability and RRDE based diffusion controlled response of the T-GO electrocatalyst are outstanding compared to GO. This study establishes metal free T-GO as an efficient electrocatalyst for the OER and used for cathodic production of hydrogen as a counter reaction in the field of water splitting.

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Conflict of interest statement

There are no conflicts to declare.

Figures

Scheme 1
Scheme 1. Schematic representation of tyramine functionalized graphene oxide (T-GO).
Fig. 1
Fig. 1. Scanning electron microscopic images of (a) and (b) T-GO (different magnification) and (c) EDAX of T-GO confirms C, N and O.
Fig. 2
Fig. 2. Superimposed (a) XRD patterns and (b) FTIR spectra of as-prepared GO and T-GO.
Fig. 3
Fig. 3. (a) Raman spectra and (b) full scan XPS spectra for GO (i) and T-GO (ii).
Fig. 4
Fig. 4. Superimposed (a) LSV of (I) GCE (bare), (II) GO and (III) T-GO, (b) Tafel plots for (II) T-GO and (I) GO in 0.5 M KOH using SCE and Pt foil as reference and counter electrodes respectively (all potentials were normalized with RHE) at 50 mV s−1.
Fig. 5
Fig. 5. (a) Electrochemical chronoamperometric current stability at applied potential 1.39 V vs. RHE for 3600 s; inset shows superimposed LSV curves before and after these stability measurements for T-GO at 50 mV s−1. (b) Superimposed Nyquist plots for (I) GCE, (II) GO and (III) T-GO in 0.5 M KOH solution at applied potential of 1.39 V vs. RHE.
Scheme 2
Scheme 2. Reaction mechanism for probable electron transfer pathways for OER on T-GO in 0.5 M KOH.
Fig. 6
Fig. 6. Superimposed LSV curves of T-GO in 0.5 M KOH with different rotating rates from 0 to 3000 rpm.
See this image and copyright information in PMC

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