Overcoming Voltage Losses in Vanadium Redox Flow Batteries Using WO₃ as a Positive Electrode

Abstract

Vanadium redox flow batteries (VRFBs) are appealing large‐scale energy storage systems due to their unique properties of independent energy/power design. The VRFBs stack design is crucial for technology deployment in power applications. Besides the design, the stack suffers from high voltage losses caused by the electrodes. The introduction of active sites into the electrode to facilitate the reaction kinetic is crucial in boosting the power rate of the VRFBs. Here, an O‐rich layer has been applied onto structured graphite felt (GF) by depositing WO3 to increase the oxygen species content. The oxygen species are the active site during the positive reaction (VO2+/VO2+) in VRFB. The increased electrocatalytic activity is demonstrated by the monoclinic (m)‐WO3/GF electrode that minimizes the voltage losses, yielding excellent performance results in terms of power density output and limiting current density (556 mWcm−2@800 mAcm−2). The results confirm that the m‐WO3/GF electrode is a promising electrode for high‐power in VRFBs, overcoming the performance‐limiting issues in a positive half‐reaction.

Electrochemical Sensing with Spatially Patterned Pt Octahedra Electrodes

“…Figure S7 (Supporting Information) results are analyzed using the Randles‐Sevcik approach in Figure S8 (Supporting Information) to gain information about reaction reversibility. [ 56 ] Deviation from a linear trend in the Randles‐Sevick plot typically indicates the irreversibility or quasi‐reversibility inherent to the system. Figure S8 (Supporting Information) analysis suggests a slightly non‐linear behavior, which can be due to deviation from an ideal reversible process.…”

Manganese and Vanadium Co-Exposure Induces Severe Neurotoxicity in the Olfactory System: Relevance to Metal-Induced Parkinsonism

“…Mn and V are both components of welding fumes generated during the welding process [43] and are present in various industries related to steel production, such as construction, car and aircraft manufacturing, and the production of temperature-resistant alloys and batteries, among others [43,[63][64][65][66][67]. As the demand for high-capacity batteries grows in the electric vehicle industry, the use of V in developing such batteries grows due to the unique redox transfer property of V oxides [68][69][70]. Recent studies show that highly favorable V chemistry can be adapted to develop high-power and long-life energy storage devices [71].…”