Redox-flow batteries, based on their particular ability to decouple power and energy, stand as prime candidates for cost-effective stationary storage, particularly in the case of long discharges storage times. Integration renewables subsequent need energy is promoting effort development mature emerging redox-flow technologies. This review aims at providing a critical analysis technologies that can potentially fulfill cost requirements enable large scale mainly aqueous systems. A...

The overriding obstacle to mass production of hydrogen from water as the premium fuel for powering our planet is frustratingly slow kinetics oxygen evolution reaction (OER). Additionally, inadequate understanding key barriers OER a hindrance insightful design advanced catalysts. This study presents ultrathin amorphous high‐surface area nickel boride (Ni x B) nanosheets low‐cost, very efficient and stable catalyst electrochemical splitting. affords 10 mA cm −2 at 0.38 V overpotential during...

Abstract In the endeavor of discovering new noble metal–free electrocatalysts for oxygen reduction reaction, multinary transition metal nanoparticle libraries are investigated. The complexity such multiple principal element alloys provides access to a large variety different elemental compositions, each with potentially unique properties. strategy efficient identification novel electrocatalytically active systems comprises combinatorial co‐sputtering into an ionic liquid followed by...

Zn metal as anode in rechargeable batteries, such Zn/air or Zn/Ni, suffers from poor cyclability. The formation of dendrites upon cycling is the key limiting step. We report a systematic study influence pulsed electroplating protocols on and turn strategies to completely prevent dendrite formation. Because large number variables protocols, scanning droplet cell technique was adapted high-throughput methodology which descriptor surface roughness can be situ derived by means electrochemical...

The fundamental understanding of the electrode/electrolyte interface is pivotal importance for efficient electrochemical conversion and storage electrical energy. However, reasons low rate electrocatalytic oxygen evolution issues long-term material stability, which are central constraints attaining desirable efficiency sustainable technologies like water electrolysis or CO2 reduction, still not completely resolved. While a lot attention has been directed towards search new materials with...

Abstract Highly active electrocatalysts for the oxygen evolution (OER) reaction are in most cases powder nanomaterials, which undergo substantial changes upon applying high potentials required high‐current‐density evolution. Owing to vigorous gas evolution, durability under OER conditions is disappointingly low as there no strategies securely fix catalysts onto electrode surfaces. Thus reliable studies of during or after often impaired. Herein, we propose use composites made from precursors...

Abstract Redox‐active conjugated microporous polymers (RCMPs) polymerized by conventional methods are commonly obtained as irregular insoluble solid particles making the electrode processing difficult. In this work, synthesis of RCMP based on anthraquinone moieties (IEP‐11) is developed via a two‐step pathway combining miniemulsion and solvothermal techniques that results in polymer nanostructures much easier to disperse solvents facilitating fabrication electrodes. Interestingly, synthetic...

Li-ion batteries (LIBs) are receiving increasing attention over the past decade due to their high energy density. This storage technology is expected continue improving performance, especially for its large-scale deployment in plug-in hybrid electric vehicles (PHEVs) and full (EVs). Such improvement requires having a large variety of analytical techniques at scientists' disposal order understand address multiple mechanisms processes occurring simultaneously this complex system. perspective...

Titania materials are gaining interest as negative electrode in Li-ion batteries due to their high power capability and enhanced safety. Today, Li4 Ti5 O12 is the material of choice for commercial batteries, but other titania materials, namely polymorphs TiO2 , being explored because similar electrochemical behavior higher theoretical specific charge capacity. In practice, capacity remains far below value 336 mA h g-1 poor electrical conductivity slow mobility. This Minireview describes main...

Redox-active organic compounds have become promising electrode materials for the development of more sustainable, economical, and safer batteries. However, their high electrochemical performance is inherently associated with use low mass-loading electrodes carbon content, which collectively hinders applicability in real This work presents an innovative approach developing high-performance practical through synthesis anthraquinone-based conjugated microporous polymers presence nanostructures...

Anatase TiO2 is a promising material for Li-ion (Li+ ) batteries with fast charging capability. However, Li+ (de)intercalation dynamics in remain elusive and reported diffusivities span many orders of magnitude. Here, we develop smart protocol scanning electrochemical cell microscopy (SECCM) situ optical (OM) to enable the high-throughput charge/discharge analysis single nanoparticle clusters. Directly probing active nanoparticles revealed that size ≈50 nm can store over 30 % theoretical...

Scanning electrochemical microscopy (SECM) inside a glove box was used for the in situ visualization of solid electrolyte interphase (SEI) formation as well Li-ion intercalation and de-intercalation on anatase TiO2 based paste electrodes.

Abstract The oxygen evolution reaction (OER) is an enabling process for technologies in the area of energy conversion and storage, but its slow kinetics limits efficiency. We performed electrochemical evaluation 14 different perovskites variable composition stoichiometry as OER electrocatalysts alkaline media. particularly focused on improved methods a reliable comparison catalyst activity. From initial results we selected most active samples further optimization electrode preparation...

An excellent electrocatalyst for reversible oxygen reduction and evolution synthesized by direct growth of nitrogen-doped carbon nanotubes on cobalt boride nanoparticles.

Individual Ni(OH)₂ nanoparticles deposited on carbon nanoelectrodes are investigated in non-ensemble measurements with respect to their energy storage properties and electrocatalysis for the oxygen evolution reaction (OER).

DFT calculations reveal interesting structure–property relationships of the redox potentials phenazines in non-aqueous media.

The solid-electrolyte interphase (SEI) plays a key role in the stability of lithium-ion batteries as SEI prevents continuous degradation electrolyte at anode. acts an insulating layer for electron transfer, still allowing ionic flux through layer. We combine feedback and multi-frequency alternating-current modes scanning electrochemical microscopy (SECM) first time to assess quantitatively local electronic properties varying formation conditions used electrolytes field Li-ion (LIB)....

In practical scenarios, viologen-derivatives face an accelerated degradation in the unavoidable presence of traces oxygen large-scale redox flow batteries. Herein, we confirm primary mechanism and propose a straightforward, cheap, fast method to evaluate stability toward this degradation. Considering that cleavage N-substituent is main proposed pathway for viologen degradation, new viologen-derivative, bearing alkylsulfonate chain with secondary carbon center joined N atom, synthesized...

Abstract Despite the excellent electrochemical properties of non‐functionalized 2,2,6,6‐tetramethylpiperidine‐1‐oxyl (TEMPO), its use in aqueous organic redox flow battery (AORFB) is hindered to date due insolubility water. However, this study, an unprecedented solubility 5.6 m demonstrated solution lithium bis(trifluoromethanesulfonyl)imide (LiTFSI), which 80 times higher than water (0.07 ). A computational study reveals that unique interaction between TEMPO and TFSI essential achieve...

Abstract Characterization of gas evolution reactions at the electrode/electrolyte boundary is often difficult due to dynamic behavior interfacial processes. Electrochemical noise measurements determined by scanning electrochemical microscopy were used characterize Cl 2 gas‐evolving electrodes (GEEs). Analysis a powerful method evaluate efficiency catalyst layer GEE. The high sensitivity developed measurement system enabled accurate monitoring current fluctuations caused gas‐bubble detachment...

LiMn2O4 (LMO) thin films are deposited on Si-based substrates with Pt current collector via multi-layer pulsed-laser-deposition technique. The LMO feature unique kinetics that yield outstanding electrochemical cycling performance in an aqueous environment. At extremely high densities of up to 1880 μA cm-2 (≈ 348 C), a reversible capacity 2.6 μAh is reached. Furthermore, the remains very stable for over 3500 cycles remarkable retention 99.996% per cycle. We provide evidence significant...

We report the first proof of concept for a non-aqueous semi-solid flow battery (SSFB) based on Na-ion chemistry using P2-type NaxNi0.22Co0.11Mn0.66O2 and NaTi2(PO4)3 as positive negative electrodes, respectively. This opens door developing new low-cost type batteries rich intercalating compounds.

The high (de)lithiation potential of TiO2 (ca. 1.7 V vs Li/Li+ in 1 M Li+) decreases the voltage and, thus, energy density a corresponding Li-ion battery. On other hand, it offers several advantages such as far from lithium deposition or absence solid electrolyte interphase (SEI). latter is currently under controversial debate studies reported presence SEI when operating electrodes at potentials above 1.0 Li/Li+. We investigate formation anatase by means X-ray photoemission spectroscopy...