Miniaturized ascorbic acid fuel cells with flexible electrodes made of graphene-coated carbon fiber cloth

Hoshi, Kazuki; Muramatsu, Keiichi; Sumi, Hisato; Nishioka, Yasushiro

doi:10.7567/jjap.55.04ec11

Cited by 15 publications

(6 citation statements)

References 58 publications

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“…The P max values of 4.4 and 8.8 μW/cm 2 at C glu = 0.05 and 2 mM, respectively, were greater than most P max values obtained from bendable fuel cells that operate at physiological conditions using tear components, e.g. , glucose, lactate, or ascorbate, as fuel (Figure D). − ,,− Among these fuel cells, stable power generation after bending has been demonstrated by only one . Moreover, most fuel cells are enzymatic and exhibit half-lives, i.e.…”

Section: Results and Discussionmentioning

confidence: 88%

Safe, Durable, and Sustainable Self-Powered Smart Contact Lenses

et al. 2022

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Smart contact lenses have the potential to serve as noninvasive healthcare devices or virtual displays. However, their implementation is limited by the lack of suitable power sources for microelectronic devices. This Article demonstrates smart contact lenses with fully embedded glucose fuel cells that are safe, flexible, and durable against deformations. These fuel cells produced stable power throughout the day or during intermittent use after storage for weeks. When the lenses were exposed to 0.05 mM glucose solution, a steady-state maximum power density of 4.4 μW/cm2 was achieved by optimizing the chemistry and porous structure of the fuel cell components. Additionally, even after bending the lenses in half 100 times, the fuel cell performance was maintained without any mechanical failure. Lastly, when the fuel cells were connected to electroresponsive hydrogel capacitors, we could clearly distinguish between the tear glucose levels under normal and diabetic conditions through the naked eye.

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Section: Results and Discussionmentioning

confidence: 88%

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et al. 2022

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“…Moreover, its maximum output power density outperforms many fuel cells such as direct photosynthetic biofuel cell (5.26 μW cm −2 ), microbial fuel cell (5.5 μW cm −2 ), glocuse fuel cell (1.45 and 230 μW cm −2 ), ascorbic acid fuel cell (1.83 μW cm −2 ), biofuel cell (120, 7.9, and 34.3 μW cm −2 ), enzymatic biofuell cell (12.5, 34.1, and 121 μW cm −2 ), and so forth (Figure 4j). [63][64][65][66][67][68][69][70][71][72] It should be noted that the carbon cloth used in FDUFC is a similar material to the gas diffusion layer in traditional proton exchange membrane fuel cell, while it has excellent mechanical and flexibility properties. It is desirable to use Ni foam as a support because it has a three-dimensional network structure, which exposes more active sites and ensures effective gas bubble release and electron/mass transfer.…”

Section: Electrochemical Performances and Entire Flexibility Of Direc...mentioning

confidence: 99%

Insights into the synergistic effect between nickel and molybdenum for catalyzing urea electrooxidation

Wang

Fei

et al. 2022

Carbon Neutralization

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The efficiency of many clean technologies, such as urea fuel cells, hydrogen production from urea-containing water splitting, and sewage treatment, and so forth, is restricted due to the sluggish kinetics of the urea oxygen reaction (UOR). Mo-doped Ni-based catalysts are excellent for UOR because of the synergistic effect between Ni and Mo. However, such applications have indeed been hampered by a lack of mechanistic comprehension. Here, we fabricate Mo-Ni(OH) 2 nanosheets for efficient UOR electrocatalysis with activity at least twice higher than Ni(OH) 2 nanosheets. Various in situ characterizations including Raman, differential electrochemical mass spectrometry and Fourier transform infrared spectroscopy reveals that the doping of Mo lowers the onset potential required for Ni 2+ /Ni 3+ conversion and promotes the coupling of the N-N bond inside the molecule and the fracture of the double bond between C and O in the urea molecule. In addition, an entirely flexible direct urea fuel cell with the Mo-Ni(OH) 2 electrocatalyst delivers a maximum output power density of 0.78 mW cm −2 and complete flexibility for the first time. Our research significantly promotes the mechanistic understanding of UOR electrocatalysis and its applications.

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“…Herein, for the first time, we demonstrate a unique sorption layer (multi-layered graphene nanostructures known as graphene flower deposited over PVA film), used to fabricate a fast, highly responsive, and extremely sensitive humidity sensor for future applications in printed electronics. GF material has attractive properties such as a large surface area of 500–2500 m 2 /g, transparent nature, remarkable conductivity, and highly crystalline structure [ 43 , 44 , 45 , 46 , 47 ]. As a result, graphene flower can be considered a viable choice for humidity sensing applications.…”

Section: Introductionmentioning

confidence: 99%

Highly Sensitive and Stable Humidity Sensor Based on the Bi-Layered PVA/Graphene Flower Composite Film

et al. 2022

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Two-dimensional (2D) materials and their composites have gained significant importance as the functional layer of various environmental sensors and nanoelectronics owing to their unique properties. This work reports for the first time a highly sensitive, fast, and stable humidity sensor based on the bi-layered active sensing area composed of graphene flower (GF) and poly (vinyl alcohol) PVA thin films for multifunctional applications. The GF/PVA humidity sensor exhibited stable impedance response over 15 days, for a relative humidity (RH) range of (40–90% RH) under ambient operating conditions. The proposed bi-layered humidity sensor also exhibited an ultra-high capacitive sensitivity response of the 29 nF/%RH at 10 kHz and fast transient response of 2 s and 3.5 s, respectively. Furthermore, the reported sensor also showed a good response towards multi-functional applications such as non-contact skin humidity and mouth breathing detection.

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Miniaturized ascorbic acid fuel cells with flexible electrodes made of graphene-coated carbon fiber cloth

Cited by 15 publications

References 58 publications

Safe, Durable, and Sustainable Self-Powered Smart Contact Lenses

Safe, Durable, and Sustainable Self-Powered Smart Contact Lenses

Insights into the synergistic effect between nickel and molybdenum for catalyzing urea electrooxidation

Highly Sensitive and Stable Humidity Sensor Based on the Bi-Layered PVA/Graphene Flower Composite Film

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