Ionic redox transistor from pore-spanning PPy(DBS) membranes

Hery, Travis; Sundaresan, Vishnu-Baba

doi:10.1039/c6ee01448h

Cited by 20 publications

(19 citation statements)

References 33 publications

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“…Table 2 were assembled following the steps outlined in SI. [23] In this oxygen barrier cathode, PPy(PF 6 ) becomes impervious to K + ions and prevents the battery from discharging/charging as observed in Figure 4(c). The batteries were tested by galvanostatic charge/discharge cycles (3-hour charge and 3-hour discharge at 100 μA) with cut-off voltages of 3.0 and 2.0 V respectively.…”

Section: Dopant Selection Cathode Fabrication and Characterizationmentioning

confidence: 95%

“…It is known from Hery and Sundaresan that pore-spanning anion doped PPy membranes can transport cations in its reduced state. [23] In this oxygen barrier cathode, PPy(PF 6 ) becomes impervious to K + ions and prevents the battery from discharging/charging as observed in Figure 4(c). Therefore, low K + conductivity of PPy (PF 6 ) as an oxygen barrier cathode precludes its use in KÀ O 2 battery despite low oxygen crossover.…”

Section: Under Argonmentioning

confidence: 95%

“…The measured Gurley value of the fibrous layer is almost zero and no pressure drop was registered in the characterization setup. [23] In addition, the microporous carbon is highly hydrophobic (with one of the highest contact angles among commercial electrodes [11] ) and prevents the aqueous polymerization solution from fully permeating into the pores. This value is lower than the specification given for air permeability on the manufacturer spec sheet (90 s).…”

Section: Dopant Selection Cathode Fabrication and Characterizationmentioning

confidence: 99%

“…PPy spans across an entire pore at a sufficiently high charge density depending on the substrate pore size, electrolyte concentration and morphology. [23,24,20] Therefore, precise control of the porosity is essential for the successful application of the functionally graded cathode and the areal charge density of PPy(PF 6 ) was varied between 100 mC cm À 2 and 300 mC cm À 2 to investigate the effect of porosity on battery performance.…”

Section: Dopant Selection Cathode Fabrication and Characterizationmentioning

confidence: 99%

“…From the SEM, it is also observed that the three-dimensional morphology of microporous carbon layer makes it less likely for PPy(PF 6 ) to completely span the pores between 100 mC cm À 2 and 300 mC cm À 2 than on a porous track-etched polycarbonate substrate. [23] In addition, the microporous carbon is highly hydrophobic (with one of the highest contact angles among commercial electrodes [11] ) and prevents the aqueous polymerization solution from fully permeating into the pores. As a result, PPy(PF 6 ) formed as a thin layer on top of the carbon as shown in the cross-section SEM in Figure 3(a) instead of throughout the thickness.…”

Section: Dopant Selection Cathode Fabrication and Characterizationmentioning

confidence: 99%

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A Functionally Graded Cathode Architecture for Extending the Cycle‐Life of Potassium‐Oxygen Batteries

Gilmore

Sundaresan

2019

Batteries & Supercaps

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Potassium-Oxygen (KÀ O 2 ) batteries have a high theoretical energy density of 935 Wh kg À 1 due to a single-electron redox process in the reversible formation of potassium superoxide. Despite this advantage, standard KÀ O 2 batteries have limited cycle-life (5-10) due to molecular oxygen crossover from cathode to anode, resulting in side reactions forming undesired superoxide on the anode. In this article, a KÀ O 2 battery fabricated with a functionally-graded cathode (FGC) architecture is presented to address oxygen crossover at the cathode. This KÀ O 2 battery lasts > 125 cycles with minimal loss in coulombic efficiency when charged/discharged to 300 μAh (238 μAh cm À 2 ). The FGC is comprised of a carbon fiber layer, microporous carbon and polypyrrole doped with hexafluorophosphate. It provides a scalable architecture for regulating K + ion and oxygen transport at the cathode trilayer (liquid-solidair) interface. The PPy(PF 6 ) formed on the cathode is observed to have an ORR rate two orders greater than that of carbonbased electrodes, as it promotes the reversible formation of potassium superoxide at the cathode, minimizes the transport of molecular oxygen into the electrolyte, and subsequently improves anode stability and cycle-life of the KÀ O 2 battery. These improvements in performance with FGC come at a marginal increase in KÀ O 2 battery material cost, which is estimated to be $44 kWh À 1 . The combination of performance and cost kWh À 1 makes this architecture the most cost-effective electrochemical energy storage device for stationary applications.

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Section: Dopant Selection Cathode Fabrication and Characterizationmentioning

confidence: 95%

Section: Under Argonmentioning

confidence: 95%

Section: Dopant Selection Cathode Fabrication and Characterizationmentioning

confidence: 99%

Section: Dopant Selection Cathode Fabrication and Characterizationmentioning

confidence: 99%

Section: Dopant Selection Cathode Fabrication and Characterizationmentioning

confidence: 99%

See 3 more Smart Citations

A Functionally Graded Cathode Architecture for Extending the Cycle‐Life of Potassium‐Oxygen Batteries

Gilmore

Sundaresan

2019

Batteries & Supercaps

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Electrically Pore‐Size‐Tunable Polypyrrole Membrane for Antifouling and Selective Separation

Tan

Zhu

et al. 2019

Adv Funct Materials

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Antifouling and selectivity are major challenges for membrane separation technology. Herein, a polypyrrole-dodecylbenzene sulfonate (PPy-DBS) membrane with tunable pores is fabricated to alleviate pore blocking and achieve selective separation. The insertion/extraction of ions during the electrical redox process causes the change of PPy-DBS volume, so that the membrane pores can be tuned in situ by applying an external redox potential. The pore size of a fouled membrane is enlarged under an oxidation voltage, then the membrane is backwashed to eliminate foulants in the pores, after which membrane pore size is recovered under a reduction voltage. Thus, membrane fouling can be effectively alleviated by adjusting the membrane pore size combined with cleaning. The specific flux of PPy-DBS membrane increased by 21.91% after applying the voltages and backwashing, and it exhibits great recycling performance. Moreover, the distribution of humic acid macromolecules in the permeate significantly decreased, proving the enhanced sieving effect of smaller membrane pores under negative voltage. This study provides an intelligent strategy for fouling prevention and selective separation in water treatment.using various feed solutions with different cations and ionic strengths. Herein, by combining electrochemical and membrane separation, we provided an electrically responsive UF membrane for fouling alleviation and selective separation, which is a promising candidate in applications such as water purification. Figure 6. A) Na 1s spectra and B) S 2p spectra of PPy-DBS membrane. 3D AFM images of PPy-DBS membranes in different electrochemical states. C) Original state. D) Oxidized state. E) Reduced state. www.afm-journal.de www.advancedsciencenews.com 1903081 (7 of 8)

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Ultrahigh‐Speed In‐Memory Electronics Enabled by Proximity‐Oxidation‐Evolved Metal Oxide Redox Transistors

et al. 2022

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of the most promising choices for future nonvolatile memory storage and neuromorphic circuit design. [6,7] Reversible, and ultrafast drifting of oxygen ions through an electric-field-induced redox process, so-called conductive filaments, is proposed as a fundamental process causing the resistance change in transition metal oxide-based memristive devices. [6,[8][9][10] Although redox-based two-terminal memristive devices have demonstrated significant success, they are still pinned down to a number of drawbacks as failing to achieve crucial features of in-memory processing such as high device conductance, achieving well-controlled multilevel memory/forgetting, long-term stability, and scalability over a large scale, all of these restrict the reliability and energy efficiency of the devices. [1,[6][7][8]11,12] In contrast, a multi-terminal solid-state resistive switching device, in which the redox process can be performed precisely by the gate, could offer an alternate platform for filament-less ultrafast memory storage and processing units. Until now, several redox based multi-terminal electronics have also been reported; for instance, Fuller et al. demonstrate parallel programming with an ionic floating-gate memory array and demonstrate its application to scalable neuromorphic computing with a microsecond operating speed. [13] Indeed, the operating speed of most of the reported redoxbased electronics is limited to the micro-or millisecond. [14][15][16] Therefore, there has yet to be a successful implementation of such a high-performing redox-based multi-terminal device and its integration over a large scale, which will, in fact, pave the way for hitherto unrevealed circuit capabilities.More importantly, current state-of-the-art nanoelectronics are confronting with major challenges of a substantial drop in computing performance as a discrepancy between the data handling speeds of processors and memories, referred to as the "memory wall," continues to widen. [1,7,12,[17][18][19][20] This makes the exploration of the integration of analog signal processing with memory operation even more essential. In this scenario, brain-inspired in-memory computing with conceptually new device architectures is emerging paradigm that have a potential to dramatically reduce the energy cost and capabilities, indeed, beyond the von Neumann architectures. [1,7,18,21] All the reports on inmemory-processing are noteworthy; however, none of these devices is capable of operating at ultrahigh processing rates;The pursuit of a universal device that combines nonvolatile multilevel storage, ultrafast writing/erasing speed, nondestructive readout, and embedded processing with low power consumption demands the development of innovative architectures. Although thin-film transistors and redoxbased resistive-switching devices have independently been proven to be ideal building blocks for data processing and storage, it is still difficult to achieve both well-controlled multilevel memory and high-precision ultrafast processing in a single unit, even ...

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Ionic redox transistor from pore-spanning PPy(DBS) membranes

Cited by 20 publications

References 33 publications

A Functionally Graded Cathode Architecture for Extending the Cycle‐Life of Potassium‐Oxygen Batteries

A Functionally Graded Cathode Architecture for Extending the Cycle‐Life of Potassium‐Oxygen Batteries

Electrically Pore‐Size‐Tunable Polypyrrole Membrane for Antifouling and Selective Separation

Ultrahigh‐Speed In‐Memory Electronics Enabled by Proximity‐Oxidation‐Evolved Metal Oxide Redox Transistors

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