Nitrogen-doped porous graphene as a highly efficient cathodic electrocatalyst for aqueous organic redox flow battery application

Abstract

The redox flow battery (RFB) is considered one of the most attractive energy storage technologies because of its high efficiency, long service life and great safety.

Hybrid Redox Flow Cells with Enhanced Electrochemical Performance via Binderless and Electrophoretically Deposited Nitrogen-Doped Graphene on Carbon Paper Electrodes

“…For N-G/SGL, the decline is gradual but in a stable manner and indicating a possibility that the onset of electrode surface corrosion increases the ECSA and leads to similar performance when using felts . Nevertheless, these findings point out that employing N-G-modified felts can be beneficial to HRFC performance, similar to what has been reported on organic redox flow batteries …”

“…20 Nevertheless, these findings point out that employing N-G-modified felts can be beneficial to HRFC performance, similar to what has been reported on organic redox flow batteries. 34 Lastly, we have tested the suitability of these electrodes in S-Air HRFC (in a three-electrode system), which is also for the first time with this type of electrode. We here aimed at improving kinetics of the polysulfide chemistry rather than performing a full S-Air cell (as both RHVFC and RHMnFC were studied as full cells) by evaluating solely the potential benefits that N-G/SGL or rGO/SGL electrodes can bring to polysulfide chemistry (without considering potential losses due to the high overpotential of ORR/OER).…”

Evaluation of a Non-Aqueous Vanadium Redox Flow Battery Using a Deep Eutectic Solvent and Graphene-Modified Carbon Electrodes via Electrophoretic Deposition

“…It is noted that a control experiment to show how N-G performs better than a standard graphene-modified CP would be of significant benefit for future DES-based RFB investigations. In this work, we did not show this comparison, because we realized from some past investigations by other workers that nitrogen doping significantly enhances RFB performance for aqueous, non-aqueous, and aqueous/organic systems [33][34][35]. However, future studies in taking this work forward is expected to report results from similar control experiments to further confirm the results reported from other investigations based on different electrolytes.…”

pH switch over a cause for high efficiency all‐aqueous CuSO 4 /[Fe( CN ) 6 ] 3− redox flow battery

“…The major advantages of RFBs are its high energy efficiency, good scale‐up process and flexible design 3,4 . Although, good ionic conductivity, cost‐effectiveness and easy and safe handling 5 makes aqueous RFBs better than non‐aqueous systems, all‐Vanadium aqueous RFBs are not popular due to its toxicity, cost and limited vanadium abundancy 3,6 . Slow redox kinetics, solubility issues, corrosiveness, toxicity and undesirable electrochemical reactions of other established RFBs such as Zn/Br and Fe/Cr extremely limited their commercialization 6‐8 .…”