Energy release from RuO2//RuO2 supercapacitors under dynamic discharge conditions

Zhang, Qingyuan; Gu, Dawei; Li, Hui; Xu, Zhihong; Sun, Hong-Shun; Li, Jishu; Wang, Lei; Shen, Lin

doi:10.1016/j.electacta.2020.137455

Cited by 46 publications

(15 citation statements)

References 45 publications

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“…Ruthenium dioxide (RuO 2 ) is a metal oxide with high electrical conductivity, stability, and capacitance that can lead to more charge accumulation in the RuO 2 sensing window [ 16 , 17 ]. This material is used as a supercapacitor due to its excellent stability in capacitance characteristics [ 18 , 19 , 20 ]. RuO 2 is used as a passivation layer for the sensing window on the top metal.…”

Section: Introductionmentioning

confidence: 99%

The Characteristics Analysis of a Microfluid-Based EGFET Biosensor with On-Chip Sensing Film for Lactic Acid Detection

Kuo

Chang

Lai

et al. 2022

Sensors

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In this research, a microfluid-based extended gate field-effect transistor (EGFET) biosensor with an on-chip sensing window (OCSW) was fabricated. The detection window was composed of six metal layers, and a ruthenium dioxide (RuO2) film was spattered on the surface and functionalized with lactase to detect lactic acid (LA). To detect LA in a more diversified way, a microfluidic system was integrated with the biosensor. Moreover, a special package was used to seal the sensing window and microfluidic tube and insulate it from other parts to prevent water molecule invasion and chip damage. The sensitivity analysis of the EGFET biosensor was studied by a semiconductor parameter analyzer (SPA). The static and dynamic measurements of the EGFET with sensing windows on a chip were analyzed. The sensing characteristics of the EGFET biosensor were verified by the experimental results. The proposed biosensor is suitable for wearable applications due to the advantages of its low weight, low voltage, and simple manufacturing process.

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Section: Introductionmentioning

confidence: 99%

The Characteristics Analysis of a Microfluid-Based EGFET Biosensor with On-Chip Sensing Film for Lactic Acid Detection

Kuo

Chang

Lai

et al. 2022

Sensors

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“…To date, the membrane/paper-like electrode materials of EDLCs have been mainly derived from materials such as CNFs, graphene, and carbon cloth/textiles . Adapted for use as electrode materials in energy storage and conversion systems, CNFs occupy an important place in all kinds of application oriented research of carbon materials, because CNFs have − a high surface area, porous network, excellent electrical conductivity, and superior chemical and mechanical properties. − To date, metal oxides and hydroxides such as RuO 2 , NiO/Ni(OH) 2 , , and VO/VO X /VO(OH) 2 , have been explored as potential pseudocapacitor electrode materials because of their ability to achieve ultrahigh capacitance and high redox electrochemical activity. − Among several transition metal oxides, RuO 2 has been studied extensively and has shown the best capacitance performance. Unfortunately, it is costly due to the Earth’s limited supply of the element Ru.…”

Section: Introductionmentioning

confidence: 99%

Carbon Nanofibers-Assembled Tungsten Oxide as Unique Hybrid Electrode Materials for High-Performance Symmetric Supercapacitors

Sun

Bai

et al. 2021

Energy Fuels

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It is crucial to balance the energy supply and demand of wearable and mobile electrical devices for their widespread applications. Supercapacitors have attracted increasing attentions in this field due to their unique advantages. This work studied the preparation of highly graphitized WO 3 −CNFs as promising flexible electrode materials for fiber-shaped supercapacitors. Tungsten oxide, a prospective energy storage material owing to its n-type semiconductor property, was integrated with carbon nanofibers (CNFs) to synthesize nanostructured WO 3 − CNFs through a combined electrospinning and hydrothermal method. A variety of amounts of ammonium metatungst (AMT) were screened and WO 3 -RCNFs8 (8 mg AMT in 20 mL water) was proven to deliver the maximum specific capacitance (381.40 F g −1 at 0.5 A g −1 ), capacitance retention (up to 111.87% after 5000 cycles), and high-rate capability (58.68% retention in specific capacitance at 20 versus 0.3 A g −1 ). A symmetric flexible solid-state supercapacitor (SFS) device was assembled using the asprepared WO 3 −CNFs8 as electrode materials. The maximum energy density of 4.28 Wh kg −1 with a power density of 3356.90 W kg −1 was achieved. The superior electrochemical performances can be explained by the synergistic effect of the n-type semiconductor property of WO 3 and the excellent charge transfer ability of CNFs, which could attract more charges into the electrode throughout charging state and release them rapidly during the discharging state. The n-type semiconductor enhanced the electrochemical behavior of CNFs and played a vital role in achieving high specific capacitance. The new procedure of preparing flexible electrode materials with enhanced charge storage/release capacity was investigated, which is chiefly essential for superior-performance energy storage devices.

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“…It has been predicted by density functional theory (DFT) calculations that the addition of the first hydrogen to a N 2 molecule adsorbed on the surface of catalysts (*N 2 ) is the potential-determining step for most NRR. [27,28] Ruthenium (IV) oxide (RuO 2 ), as a transition-metal-based oxide, has been intensively studied as electrode materials for oxygen evolution, [35][36][37] supercapacitors, [38] batteries [39] and biosensors. [40] In an early research on RuO 2 based NRR, H 2 O on the surface of RuO 2 particles can be easily decomposed to *H, facilitating the hydrogenation of the adsorbed dinitrogen species.…”

Section: Introductionmentioning

confidence: 99%

Synergy of Bi₂O₃ and RuO₂ Nanocatalysts for Low‐Overpotential and Wide pH‐Window Electrochemical Ammonia Synthesis

Yu²,

Deng

et al. 2021

Chemistry A European J

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Electrocatalytic nitrogen reduction reaction (NRR) under ambient conditions is still seriously impeded by the inferior NH 3 yield and low Faradaic efficiency, especially at low overpotentials. Herein, we report the synthesis of nanosized RuO 2 and Bi 2 O 3 particles grown on functionalized exfoliated graphene (FEG) through in situ electrodeposition, denoted as RuO 2 À Bi 2 O 3 /FEG. The prepared self-supporting RuO 2 À Bi 2 O 3 /FEG hybrid with a Bi mass loading of 0.70 wt% and Ru mass loading of 0.04 wt% shows excellent NRR performance at low overpotentials in acidic, neutral and alkaline electrolytes. It achieves a large NH 3 yield of 4.58 � 0.16 μg NH3 h À 1 cm À 2 with a high Faradaic efficiency of 14.6 % at À 0.2 V versus reversible hydrogen electrode in 0.1 M Na 2 SO 4 electrolyte. This performance benefits from the synergistic effect between Bi 2 O 3 and RuO 2 which respectively have a fairly strong interaction of Bi 6p orbitals with the N 2p band and abundant supply of *H, as well as the binder-free characteristic and the convenient electron transfer via graphene nanosheets. This work highlights a new electrocatalyst design strategy that combines transition and maingroup metal elements, which may provide some inspirations for designing low-cost and high-performance NRR electrocatalysts in the future.

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Energy release from RuO2//RuO2 supercapacitors under dynamic discharge conditions

Cited by 46 publications

References 45 publications

The Characteristics Analysis of a Microfluid-Based EGFET Biosensor with On-Chip Sensing Film for Lactic Acid Detection

The Characteristics Analysis of a Microfluid-Based EGFET Biosensor with On-Chip Sensing Film for Lactic Acid Detection

Carbon Nanofibers-Assembled Tungsten Oxide as Unique Hybrid Electrode Materials for High-Performance Symmetric Supercapacitors

Synergy of Bi₂O₃ and RuO₂ Nanocatalysts for Low‐Overpotential and Wide pH‐Window Electrochemical Ammonia Synthesis

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Energy release from RuO2//RuO2 supercapacitors under dynamic discharge conditions

Cited by 46 publications

References 45 publications

The Characteristics Analysis of a Microfluid-Based EGFET Biosensor with On-Chip Sensing Film for Lactic Acid Detection

The Characteristics Analysis of a Microfluid-Based EGFET Biosensor with On-Chip Sensing Film for Lactic Acid Detection

Carbon Nanofibers-Assembled Tungsten Oxide as Unique Hybrid Electrode Materials for High-Performance Symmetric Supercapacitors

Synergy of Bi2O3 and RuO2 Nanocatalysts for Low‐Overpotential and Wide pH‐Window Electrochemical Ammonia Synthesis

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Synergy of Bi₂O₃ and RuO₂ Nanocatalysts for Low‐Overpotential and Wide pH‐Window Electrochemical Ammonia Synthesis