Abstract:A zinc‐bromine redox flow battery (RFB) is highly suitable for high‐energy storage due to its decoupled energy and power generation. However, the poor kinetics and poor reversible behavior of Br2/Br− redox activity are some of the significant barriers, and as a result, the flow system delivers low power density. To increase the efficiency of the flow cell, in the present work, bimetallic catalysts are deposited on 3D graphite felt network and are used in the positive electrode for enhancing the kinetics of the… Show more
“…Pt-based alloys are recognized as a promising choice attributing to their excellent behaviors. 31,32 Furthermore, PANI was successfully coated on the surface of PtNi material (Fig. S1c and f†).…”
“…Pt-based alloys are recognized as a promising choice attributing to their excellent behaviors. 31,32 Furthermore, PANI was successfully coated on the surface of PtNi material (Fig. S1c and f†).…”
“…[26] Ulaganathan and colleagues reported Pt@GF electrodes to get an enhancement of bromine kinetics. [27,28] Moreover, Liu et al developed an aqueous zinc bromine battery integrated with the exfoliated covalent organic frameworks (COFs) for bromine cathode. The abundant functional groups of COFs exhibited strong adsorption toward Br species and facilitated the bidirectional conversion of polybromide.…”
Zinc bromine flow batteries (ZBFBs) are well suited for stationary energy storage due to their attractive features of high energy density and low cost. Nevertheless, the ZBFBs suffer from low power density and limited efficiency owing to the relatively severe polarization of the Br2/Br− redox couple. Herein, a three‐dimensional (3D) hierarchical composite electrode based on core‐shell Ni/NiO heterostructures anchored on graphite felt (Ni/NiO@GF) is designed to promote the kinetics of the Br2/Br− couple, so as to improve the power density and efficiency of the ZBFB. In this design, the highly conductive carbon felt and Ni cores provide a composite electrode with a 3D electron transporting framework to guarantee excellent electronic conductivity, while the NiO shells possess great absorption ability to Br2 and brilliant catalytic activity for the Br2/Br− redox reaction to reduce the electrochemical polarization. As a result, an enhanced ZBFB with Ni/NiO@GF electrode shows an outstanding energy efficiency of 86% at 20 mA cm−2 and can be operated at a current density of up to 160 mA cm−2 with a respectable energy efficiency of 67%. These results exhibit a promising strategy to fabricate catalytic electrodes for high‐performance ZBFBs.
“…Since the electrode is a key parameter that determines the power density of ZBRFBs, it is very essential to introduce a novel electrode design with good stability and electrochemical activity. Till date, several approaches have been made to enhance the electrochemical activity of the electrode, and various modication techniques have also been adopted, mostly including creating functional groups, [13][14][15] porous architecture, 16,17 decorating with metal/metal oxide electrocatalysts, [18][19][20] and loading carbon-based materials on the electrode. [21][22][23][24][25] However, some of the reported electrocatalysts exhibited relatively low electrochemical activity.…”
Metal-Organic Frameworks (MOFs) have recently emerged as an attractive class of porous materials for electrochemical energy storage applications, owing to their high surface area, active metal sites, and easy control...
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.