High-performance bipolar plate of thin IrO x -coated TiO 2 nanotubes in vanadium redox flow batteries

Han, Jaejin; Yoo, Hyeong Seon; Kim, Moonsu; Lee, Gibaek; Choi, Jinsub

doi:10.1016/j.cattod.2017.06.018

Cited by 27 publications

(11 citation statements)

References 42 publications

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“…Iridium-oxide coated dimensionally stable electrodes have been evaluated as positive electrode in a VRFB [190]; no specific catalytic effects were reported. Han et al prepared nanotubular TiO 2 on a titanium substrate subsequently coated with a layer of IrO x [456]. The bipolar plate thus made was only 0.137 mm thick.…”

Section: Non-carbon Materials and Miscellaneous Conceptsmentioning

confidence: 99%

Electrocatalysis at Electrodes for Vanadium Redox Flow Batteries

Holze

2018

Batteries

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Flow batteries (also: redox batteries or redox flow batteries RFB) are briefly introduced as systems for conversion and storage of electrical energy into chemical energy and back. Their place in the wide range of systems and processes for energy conversion and storage is outlined. Acceleration of electrochemical charge transfer for vanadium-based redox systems desired for improved performance efficiency of these systems is reviewed in detail; relevant data pertaining to other redox systems are added when possibly meriting attention. An attempt is made to separate effects simply caused by enlarged electrochemically active surface area and true (specific) electrocatalytic activity. Because this requires proper definition of the experimental setup and careful examination of experimental results, electrochemical methods employed in the reviewed studies are described first.

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Section: Non-carbon Materials and Miscellaneous Conceptsmentioning

confidence: 99%

Electrocatalysis at Electrodes for Vanadium Redox Flow Batteries

Holze

2018

Batteries

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“…To analyze the change in the surface structure during the calcination, we analyzed the X-ray photoelectron spectroscopy (XPS) spectra of the catalysts. As shown in Figure c, we observed the O 1s peaks at 525.1, 526.4, and 528.1 eV, which are assigned to the lattice oxygen, OH species, and absorbed H 2 O, respectively. ,,,,− The relative concentration of the OH species is represented by the θ value (θ = ) (for details, see Table S2). The E OER @10 mA cm –2 is plotted as a function of θ in Figure d.…”

Section: Resultsmentioning

confidence: 92%

“…The XPS spectra of the Ir of the catalysts are shown in Figure e. The raw spectra (black curves) were deconvoluted into the metallic Ir 0 (red curves), Ir III (green curves), and Ir IV (blue curves). ,− The relative contents of these three Ir valences are listed in Table S3. The relations between the relative contents of the Ir 0 , Ir III , Ir IV valence states and the calcination times are shown in Figure f, in which the relative contents of the Ir 0 and Ir III decreased with the increase in the calcination time.…”

Section: Resultsmentioning

confidence: 99%

Impact of Ir-Valence Control and Surface Nanostructure on Oxygen Evolution Reaction over a Highly Efficient Ir–TiO₂ Nanorod Catalyst

et al. 2019

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Iridium oxide (IrO x )-based materials are the most suitable oxygen evolution reaction (OER) catalysts for water electrolysis in acidic media. There is a strong demand from industry for improved performance and reduction of the Ir amount. Here, we report a composite catalyst, IrO x −TiO 2 −Ti (ITOT), with a high concentration of active OH species and mixed valence IrO x on its surface. We have discovered that the obtained ITOT catalyst shows an outstanding OER activity (1.43 V vs RHE at 10 mA cm −2 ) in acidic media. Moreover, no apparent potential increase was observed even after a chronopotentiometry test at 10 mA cm −2 for 100 h and cyclic voltammetry for 700 cycles. We proposed a detailed OER mechanism on the basis of the analysis of the in situ electrochemical X-ray absorption near-edge structure (XANES) and extended X-ray absorption fine structure (EXAFS) measurements as well as density functional theory (DFT) calculations. All together, we have concluded that controllable Ir-valence and the high OH concentration in the catalyst is crucial for the obtained high OER activity.

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“…Taking this into account, publications that focus on bipolar plates aim to lessen the ohmic resistances by reducing the electrical resistance of the material, the contact resistance, or both. Han et al [87] produced bipolar plates with TiO 2 nanotubes coated with IrO x . By using this material, it was possible to reduce the thickness of the bipolar plates when compared to the composite graphite typically used.…”

Section: Inorganic Aqueousmentioning

confidence: 99%

Redox Flow Batteries: Materials, Design and Prospects

et al. 2021

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The implementation of renewable energy sources is rapidly growing in the electrical sector. This is a major step for civilization since it will reduce the carbon footprint and ensure a sustainable future. Nevertheless, these sources of energy are far from perfect and require complementary technologies to ensure dispatchable energy and this requires storage. In the last few decades, redox flow batteries (RFB) have been revealed to be an interesting alternative for this application, mainly due to their versatility and scalability. This technology has been the focus of intense research and great advances in the last decade. This review aims to summarize the most relevant advances achieved in the last few years, i.e., from 2015 until the middle of 2021. A synopsis of the different types of RFB technology will be conducted. Particular attention will be given to vanadium redox flow batteries (VRFB), the most mature RFB technology, but also to the emerging most promising chemistries. An in-depth review will be performed regarding the main innovations, materials, and designs. The main drawbacks and future perspectives for this technology will also be addressed.

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High-performance bipolar plate of thin IrO x -coated TiO 2 nanotubes in vanadium redox flow batteries

Cited by 27 publications

References 42 publications

Electrocatalysis at Electrodes for Vanadium Redox Flow Batteries

Electrocatalysis at Electrodes for Vanadium Redox Flow Batteries

Impact of Ir-Valence Control and Surface Nanostructure on Oxygen Evolution Reaction over a Highly Efficient Ir–TiO₂ Nanorod Catalyst

Redox Flow Batteries: Materials, Design and Prospects

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High-performance bipolar plate of thin IrO x -coated TiO 2 nanotubes in vanadium redox flow batteries

Cited by 27 publications

References 42 publications

Electrocatalysis at Electrodes for Vanadium Redox Flow Batteries

Electrocatalysis at Electrodes for Vanadium Redox Flow Batteries

Impact of Ir-Valence Control and Surface Nanostructure on Oxygen Evolution Reaction over a Highly Efficient Ir–TiO2 Nanorod Catalyst

Redox Flow Batteries: Materials, Design and Prospects

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Impact of Ir-Valence Control and Surface Nanostructure on Oxygen Evolution Reaction over a Highly Efficient Ir–TiO₂ Nanorod Catalyst