Emerging hydrovoltaic technology based on carbon black and porous carbon materials: A mini review

Jiao, Shipu; Liu, Miao; Li, Yang; Abrha, Halayit; Wang, Jiao; Dai, Yexin; Li, Jingyu; Kang, Ning; Li, Yunxue; Liu, Xianhua

doi:10.1016/j.carbon.2022.03.047

Cited by 47 publications

(22 citation statements)

References 77 publications

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Section: Resultsmentioning

confidence: 99%

“…In addition, it is noticed that the polarity of electrical output generated by the FLG is the same regardless of the direction of water flow, which is different from the typical output dominated by hydrovoltaic effects. [25] The recently reported works have pointed out that the interfacial electric field plays an important role in the tribovoltaic effect. [24,26,27] To further clarify the interface characteristics between the solid surface and liquid molecules, including bond formation, charge transfer, and induced dipole electric field, we have performed DFT calculations at an atomic scale.…”

Section: Working Mechanism Of the Flgmentioning

confidence: 99%

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Flexible Liquid‐Based Continuous Direct‐Current Tribovoltaic Generators Enable Self‐Powered Multi‐Modal Sensing

Huang

Liu

Gao

et al. 2022

Adv Funct Materials

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Flexible tribovoltaic direct-current (DC) generators are urgently expected by wearable applications. Traditional rigid contact-separation type tribovoltaic DC generators normally have non-ignorable friction loss and cannot sustain outstanding outputs. This hinders their serviceability in continuous motion scenarios. Here, flexible liquid-based DC generators (FLGs) with metalliquid-semiconductor indium gallium zinc oxide (IGZO) stack structures are reported. The FLG with Pt/H 2 O/IGZO structure delivers a peak short-circuit current density up to 2.3 µA cm −2 , a peak open-circuit voltage up to 620 mV, and a power density up to 0.1 µW cm −2 . The differences in the properties of different liquid-solid interfaces are studied by density functional theory, showing that the bond formation, charge-transfer-induced dipole electric field at the solid-liquid interface, and the built-in electric field are responsible for the generation and separation of electron-hole pairs to form continuous DC. The proposed FLG can keep excellent performance even after >5 × 10 4 shaking cycles or exposing to ambient conditions for 30 days, showing extraordinary stability. Besides charging capacitors or driving LEDs, the FLG is further demonstrated to work for self-powered multifunctional sensing, enabling pressure, position-posture, or temperature detections. This design offers potential solutions and novel possibilities for next-generation self-powered wearable electronics.

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Section: Resultsmentioning

confidence: 99%

Section: Working Mechanism Of the Flgmentioning

confidence: 99%

Flexible Liquid‐Based Continuous Direct‐Current Tribovoltaic Generators Enable Self‐Powered Multi‐Modal Sensing

Huang

Liu

Gao

et al. 2022

Adv Funct Materials

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“…EDLCs follow a mechanism based on non-faradic processes, i.e., electrical absorption of electrolytic ions at the electrode/electrolyte interface. Reversible multielectron redox faradic reaction mechanisms occur in pseudocapacitors by which the specific capacitance and energy density can be determined. − Electrochemical double-layer capacitors (EDLCs) have many desirable features such as increased power density, security, fast charge/discharge capacity, digital communication ability, applicability in electric vehicles, memory backup, uninterruptible power sources, etc. , In general, carbon nanostructured materials in electrochemical double layer capacitors are the most preferred electrodes because of their extremely elevated surface area and high electron mobility. Among the several carbon materials, because of the elevated surface area, large pore size, low electronic and ionic charge-transfer resistance, high chemical stability, and electrical conductivity, carbon nanotubes (CNTs) act as potential electrode materials in supercapacitors. − In particular, CNTs help recover the efficiency of the charge/discharge process by improving conductivity.…”

Section: Introductionmentioning

confidence: 99%

Direct Growth of Binder-Free CNTs on a Nickel Foam Substrate for Highly Efficient Symmetric Supercapacitors

et al. 2023

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In the modern civilized world, energy scarcity and associated environmental pollution are the center of focus in the search for reliable energy storage and harvesting devices. The need to develop cheaper and more competent binder-free electrodes for high-performance supercapacitors has attracted considerable research attention. In this study, two different procedures are followed to enhance the growth of carbon nanotubes (CNT-E and CNT-NF) directly coated on a Ni-foam substrate by a well-functioning chemical vapor deposition (CVD) method. Thus, directly grown optimized CNT electrodes are used as electrodes for electrochemical devices. Furthermore, solid-state symmetric supercapacitors are fabricated using CNT-NF//CNT-NF, and fruitful results are obtained with maximum specific capacitance (250.51 F/g), energy density (68.19 Wh/kg), and power density (2799.77 W/kg) at 1 A/g current density. The device exhibited good cyclic stability, with 92.42% capacitive retention and 99.68% Coulombic efficiency at 10 000 cycles, indicating the suitability of the electrodes for practical applications. This study emphasizes the importance of studying the direct growth of binder-free CNT electrodes to understand the actual behavior of electrodes and the proper storage mechanism.

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“…The extensive application of fossil fuel-based energy and the rapid development of industrial technology have greatly facilitated people’s productivity and life, but the huge demand for energy consumption has brought negative impacts such as the energy crisis and global warming. 1 Many people, especially those living in developing countries and/or remote areas, suffer from energy shortages. 2 Combustion-based power is the most extensively used secondary energy in modern society.…”

Section: Introductionmentioning

confidence: 99%

Graphene oxide as a versatile platform for emerging hydrovoltaic technology

Jiao

et al. 2022

J. Mater. Chem. A

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Emerging hydrovoltaic technology based on carbon black and porous carbon materials: A mini review

Cited by 47 publications

References 77 publications

Flexible Liquid‐Based Continuous Direct‐Current Tribovoltaic Generators Enable Self‐Powered Multi‐Modal Sensing

Flexible Liquid‐Based Continuous Direct‐Current Tribovoltaic Generators Enable Self‐Powered Multi‐Modal Sensing

Direct Growth of Binder-Free CNTs on a Nickel Foam Substrate for Highly Efficient Symmetric Supercapacitors

Graphene oxide as a versatile platform for emerging hydrovoltaic technology

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