Rotating ring-disc electrode measurements for the quantitative electrokinetic investigation of the V3+-reduction at modified carbon electrodes

Tichter, Tim; Schneider, Jonathan; Viet, Duc Nguyen; Duque, Alvaro Diaz; Roth, Christina

doi:10.1016/j.jelechem.2020.113843

Cited by 9 publications

(5 citation statements)

References 41 publications

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“…[30] The diffusion coefficients (D) for the 0.5 m V 2 O 4 /KB + 1.5 m VO 2+ , the 0.5 m V 2 O 3 /KB + 1.5 m V 3+ , the 0.5 m V 2 O 4 /KB, and the 0.5 m V 2 O 3 /KB colloid samples were calculated to be 2.445 × 10 −6 , 1.386 × 10 -7 , 3.548 × 10 −5 , and 2.218 × 10 −6 cm 2 s −1 , respec-tively, which were comparable to the D values of VO 2+ /VO 2 + and V 3+ /V 2+ species (10 −6 -10 −7 cm 2 s −1 ). [36,37] The VCFBs were assembled in accordance with a standard flow cell configuration, utilizing sPEEK membranes as the separator. The procedure for preparing the sPEEK membranes was detailed in the Experimental Section.…”

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Energy Density Boosted Vanadium Colloid Flow Batteries Realized by a Reversible Nanoparticle Suspension‐Dissolution Strategy

Wei,

Sun,

Zhang

et al. 2024

Adv Funct Materials

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Vanadium redox flow batteries (VRFBs) hold great promise for large‐scale energy storage, but their performance requires further improvement. Herein, a design is proposed for vanadium colloid flow batteries (VCFBs) that integrates the redox chemistry of polyvalent vanadium‐based colloid suspensions with dispersed conductive agents into traditional vanadium electrolytes. The redox‐active colloids combine the advantages of nanoparticle suspensions and dissolved electrolytes, exhibiting good dispersibility, fluidity, conductivity, redox reversibility, and electrochemical kinetics. By leveraging a reversible dissolution/suspension process of high‐concentration vanadium‐based colloids, the VCFBs achieved an energy density of 48 Wh L−1, nearly double that of conventional VRFBs. This work presents a rational design for homologous active material colloids to enhance the energy density of aqueous redox flow batteries, thereby advancing the potential for grid‐scale and renewable energy storage.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Energy Density Boosted Vanadium Colloid Flow Batteries Realized by a Reversible Nanoparticle Suspension‐Dissolution Strategy

Wei,

Sun,

Zhang

et al. 2024

Adv Funct Materials

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“…To understand the specific processes on the electrode during electrochemical reaction, we further analyzed EIS data at different potentials to obtain the distribution of relaxation time (DRT), a useful parameter for evaluating the mass transfer process adjacent to the electrocatalyst surface. , In the high relaxation time (τ) region (10 3 –10 5 ), a characteristic peak can be observed, and the integrated area of this peak represents the mass transfer resistance (Figure d). At each tested potential, the characteristic peak of CuFeO x H y -Co has a smaller τ and peak intensity compared to that of CuFeO x H y , indicating faster mass transfer of reactants at the anode interface (Figure S19).…”

Section: Resultsmentioning

confidence: 99%

Cation-Triggered Growth of Nanowires for Enhanced Oxygen Evolution Reaction

Wang,

Ye,

Zhang

et al. 2024

Inorg. Chem.

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The oxygen evolution reaction (OER), which occurs in a variety of energy-related devices, necessitates optimization of the reaction pathways for efficient and scalable deployment. Nevertheless, fully harnessing the advanced structure of synthetic electrocatalysts remains a significant challenge due to the inevitable surface reconstruction process during OER. Here we present an efficient and flexible method to control the surface reconstruction process by engineering an electrolyte containing trace Co 2+ cation. This controllable reconstruction process enhances fast charge transfer, facilitates electroactive species transport, and exposes the inner active site, significantly improving the OER kinetics. An impressive 60% increase in current density at an applied potential of 2.2 V (vs RHE) confirms its remarkable contribution to the performance. The identification of cation-triggered reconstruction for the formation of a well-defined surface provides a novel insight into understanding electrolyte engineering and offers a viable pathway to address activity and stable concerns in electrocatalysts.

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“…As shown in Figure S20, a smaller Tafel slope value is obtained at a more active HC-Ni 2 P electrode, indicating its intrinsic high activity toward the OER. DRT analysis was performed to further evaluate the mass transfer near the electrode surface. , The EIS spectra were deconvoluted by the DRT method in the frequency range from 10 –2 to 10 6 Hz. At an overpotential of 400 mV, the DRT curves for all three Ni 2 P electrodes exhibit two characteristic peaks (Figure S21).…”

Section: Resultsmentioning

confidence: 99%

“…DRT analysis was performed to further evaluate the mass transfer near the electrode surface. 43,44 The EIS spectra were deconvoluted by the DRT method in the frequency range from 10 −2 to 10 6 Hz. At an overpotential of 400 mV, the DRT curves for all three Ni 2 P electrodes exhibit two characteristic peaks (Figure S21).…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Crystalline-Dependent Discharge Process of Locally Enhanced Electrooxidation Activity on Ni₂P

Wang

Zhao

et al. 2023

Inorg. Chem.

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The state-of-the-art transition-based electrocatalysts in alkaline media generally suffer from unavoidable surface reconstruction during oxygen evolution reaction measurements, leading to the collapse and loss of the crystalline matrix. Low potential discharge offers a gentle way for surface reconstruction and thus realizes the manipulation of the real active site. Nevertheless, the absence of a fundamental understanding focus on this discharge region renders the functional phase, either the crystalline or amorphous matrix, for the controllable reconstruction still undecidable. Herein, we report a scenario to employ different crystalline matrices as electrocatalysts for discharge region reconstruction. The representative low crystalline Ni 2 P (LC-Ni 2 P) possesses a relatively weak surface structure compared with highly crystalline or amorphous Ni 2 P (HC-Ni 2 P or A-Ni 2 P), which contributes abundant oxygen vacancies after the discharge process. The fast discharge behavior of LC-Ni 2 P leads to the uniform distribution of these vacancies and thus endows the inner interface with reactant activating functionality. A high increase in current density of 36.7% is achieved at 2.32 V (vs RHE) for the LC-Ni 2 P electrode. The understanding of the discharge behavior in this study, on different crystalline matrices, presents insights into the establishment of controllable surface reconstruction for an effective oxygen evolution reaction.

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Rotating ring-disc electrode measurements for the quantitative electrokinetic investigation of the V3+-reduction at modified carbon electrodes

Cited by 9 publications

References 41 publications

Energy Density Boosted Vanadium Colloid Flow Batteries Realized by a Reversible Nanoparticle Suspension‐Dissolution Strategy

Energy Density Boosted Vanadium Colloid Flow Batteries Realized by a Reversible Nanoparticle Suspension‐Dissolution Strategy

Cation-Triggered Growth of Nanowires for Enhanced Oxygen Evolution Reaction

Crystalline-Dependent Discharge Process of Locally Enhanced Electrooxidation Activity on Ni₂P

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Rotating ring-disc electrode measurements for the quantitative electrokinetic investigation of the V3+-reduction at modified carbon electrodes

Cited by 9 publications

References 41 publications

Energy Density Boosted Vanadium Colloid Flow Batteries Realized by a Reversible Nanoparticle Suspension‐Dissolution Strategy

Energy Density Boosted Vanadium Colloid Flow Batteries Realized by a Reversible Nanoparticle Suspension‐Dissolution Strategy

Cation-Triggered Growth of Nanowires for Enhanced Oxygen Evolution Reaction

Crystalline-Dependent Discharge Process of Locally Enhanced Electrooxidation Activity on Ni2P

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Crystalline-Dependent Discharge Process of Locally Enhanced Electrooxidation Activity on Ni₂P