Hydrogen Production from the Air

Li, Gang Kevin; Guo, Jining; Zhang, Yuecheng; Zavabeti, Ali; Chen, Kaifei; Guo, Yalou; Hu, Guoping; Fan, Xiaolei

doi:10.21203/rs.3.rs-691931/v1

Cited by 1 publication

(1 citation statement)

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“…Furthermore, it has been recently reported that the green energy source hydrogen 74 or hydrogen peroxide 25 can be directly produced from moisture present in air already at low relative humidities. As shown in this work, the colloidal probe method is a suitable platform to study the effects of humidity and may be included in an electrochemical setup to study the effect of mechanical forces on harvesting hydrogen from air.…”

Section: Single-contactmentioning

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: Single-contactmentioning

confidence: 99%