Improving the performances of direct-current triboelectric nanogenerators with surface chemistry

Lyu, Xin; Ciampi, Simone

doi:10.1016/j.cocis.2022.101627

Cited by 3 publications

(2 citation statements)

References 105 publications

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“…In contrast to room-temperature experiments, measurements performed at elevated temperatures close to the water's boiling point showed that the charging is constant and lower than that at room temperature. The work presented here explores the contact electrification of a dynamically changing solid−liquid−solid interface and addresses the pressing matter of the influence of surface water on the charging process of DC TENGs, very recently posed by Lyu and Ciampi, 31 and other energy harvesting applications exploiting the water−solid electrification mechanism.…”

Section: Introductionmentioning

confidence: 99%

Influence of Wettability and Geometry on Contact Electrification between Nonionic Insulators

Jimidar,

Kwiecinski,

Roozendaal

et al. 2023

ACS Appl. Mater. Interfaces

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Contact electrification is an interfacial process in which two surfaces exchange electrical charges when they are in contact with one another. Consequently, the surfaces may gain opposite polarity, inducing an electrostatic attraction. Therefore, this principle can be exploited to generate electricity, which has been precisely done in triboelectric nanogenerators (TENGs) over the last decades. The details of the underlying mechanisms are still ill-understood, especially the influence of relative humidity (RH). Using the colloidal probe technique, we convincingly show that water plays an important role in the charge exchange process when two distinct insulators with different wettability are contacted and separated in <1 s at ambient conditions. The charging process is faster, and more charge is acquired with increasing relative humidity, also beyond RH = 40% (at which TENGs have their maximum power generation), due to the geometrical asymmetry (curved colloid surface vs planar substrate) introduced in the system. In addition, the charging time constant is determined, which is found to decrease with increasing relative humidity. Altogether, the current study adds to our understanding of how humidity levels affect the charging process between two solid surfaces, which is even enhanced up to RH = 90% as long as the curved surface is hydrophilic, paving the way for designing novel and more efficient TENGs, eco-energy harvesting devices which utilize water and solid charge interaction mechanism, self-powered sensors, and tribotronics.

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Section: Introductionmentioning

confidence: 99%

Influence of Wettability and Geometry on Contact Electrification between Nonionic Insulators

Jimidar,

Kwiecinski,

Roozendaal

et al. 2023

ACS Appl. Mater. Interfaces

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“…The mechanism for the mechanic-to-electric energy conversion occurring in a sliding Schottky diode is undoubtedly a surface process dominated by several properties of the metal-semiconductor interface [17]. Consequently, the manipulation of the silicon surface chemistry, for example via hydrosilylation reactions to graft organic monolayers on the Surfaces 2023, 6 282 surface [18,19], offers a path to maximize TENGs' performances by controlling wettability, friction, adhesion, and work function [20,21]. Despite the undisputed anodic protection that the attachment of an organic monolayer imparts to the silicon surface when the contact is a (soft) liquid [18,19,22,23], silicon-based Schottky TENGs have so far only shown a limited lifespan, severely restricting their viability [24].…”

Section: Introductionmentioning

confidence: 99%

Oxidative Damage during the Operation of Si(211)-Based Triboelectric Nanogenerators

Hurtado,

Ciampi

2023

Surfaces

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Triboelectric nanogenerators (TENGs) based on sliding metal–semiconductor junctions are an emerging technology that can efficiently convert mechanical into electrical energy. These miniature autonomous power sources can output large direct current (DC) densities, but often suffer from limited durability; hence, their practical scope remains uncertain. Herein, through a combination of conductive atomic force microscopy (C-AFM) and photocurrent decay (PCM) experiments, we explored the underlying cause of surface wear during the operation of DC-TENGs. Using monolayer-functionalized Si(211) surfaces as the model system, we demonstrate the extent to which surface damage develops during TENG operation. We reveal that the introduction of surface defects (oxide growth) during TENG operation is not caused by the passage of the rather large current densities (average output of ~2 × 106 A/m2); it is instead mainly caused by the large pressure (~GPa) required for the sliding Schottky diode to output a measurable zero-bias current. We also discovered that the drop in output during operation occurs with a delay in the friction/pressure event, which partially explains why such deterioration of DC-TENG performance is often underestimated or not reported.

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Direct-current output of silicon–organic monolayer–platinum Schottky TENGs: Elusive friction-output relationship

Lyu

MacGregor

et al. 2023

Nano Energy

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Improving the performances of direct-current triboelectric nanogenerators with surface chemistry

Cited by 3 publications

References 105 publications

Influence of Wettability and Geometry on Contact Electrification between Nonionic Insulators

Influence of Wettability and Geometry on Contact Electrification between Nonionic Insulators

Oxidative Damage during the Operation of Si(211)-Based Triboelectric Nanogenerators

Direct-current output of silicon–organic monolayer–platinum Schottky TENGs: Elusive friction-output relationship

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