Visualization and standardized quantification of surface charge density for triboelectric materials.

Triboelectric nanogenerator (TENG) operates on the principle of utilizing contact electrification and electrostatic induction. However, visualization and standardized quantification of surface charges for triboelectric materials remain challenging. Here, we report a surface charge visualization and standardized quantification method using electrostatic surface potential measured by Kevin probe and the iterative regularization strategy.

Rotary Wind-driven Triboelectric Nanogenerator for Self-Powered Airflow Temperature Monitoring of Industrial Equipment.

Heat dissipation performance is crucial for the operational reliability of industrial equipment, which can be monitored by detecting the wind or airflow temperature of the radiator. The emergence of triboelectric nanogenerators (TENGs) provides new routes for wind energy harvesting and self-powered sensing. Herein, a rotary wind-driven triboelectric nanogenerator (RW-TENG) with soft-contact working mode is newly designed to achieve tunable contact areas by utilizing the reliable thermal response of NiTi shape memory alloy (SMA) to air/wind temperature.

Recent progresses, challenges and proposals on SF emission reduction approaches.

The increasing utilization and emission of sulfur hexafluoride (SF) pose severe threats to the climate and the environment, owing to its potent greenhouse gas properties. In this paper, we comprehensively review the recent progresses of SF emission reduction approaches. Currently, the use and emission of SF are still on the rise, and mainly concentrated in the power industry.

Real-Time Measurement of SO, HS, and CS Mixed Gases Using Ultraviolet Spectroscopy and a Least Squares Algorithm.

Sulfur dioxide, carbon disulfide, and hydrogen sulfide are important decomposition products of insulating gas sulfur hexafluoride, and their types and contents are of great significance for the fault diagnosis of SF insulated equipment. In this paper, a method of combining ultraviolet absorption spectroscopy and least squares fitting is proposed for the quantitative calculation of sulfur dioxide, carbon disulfide, and hydrogen sulfide mixed gases. All three gases have absorption peaks in the ultraviolet band and they overlap with each other which makes it hard to determinate the concentrations of the three gases directly.

Interaction Mechanism between the CFN-CO Gas Mixture and the EPDM Seal Ring.

CFN (fluorinated nitrile) has been introduced as a remarkable substitute gas for the greenhouse gas SF (sulfur hexafluoride) which is used in gas-insulated equipment (GIE). Intensive investigations about the compatibility between CFN and materials used in GIE are required to decide their long-term behavior. In this paper, the interaction mechanism between EPDM, used as a sealing ring in GIE, and CFN-CO was explored.

SF abatement in a packed bed plasma reactor: study towards the effect of O concentration.

SF is a greenhouse gas with extremely high global warming potential value (GWP). In this paper, oxygen and a packed bed plasma reactor (PBR) were applied to remove it. The synergistic effect between oxygen and PBRs was evaluated by the destruction and removal efficiency (DRE) and energy yield (EY) at different oxygen concentrations.

Adsorption of SF Decomposed Products over ZnO(101̅0): Effects of O and Zn Vacancies.

We carried out a density functional theory study to investigate the adsorption behavior of four kinds of SF decomposed products over the ZnO(101̅0) surface. The effects of O and Zn vacancies on the surface were also considered. For perfect ZnO(101̅0) surface, the adsorption of SO and HS exhibits stronger chemical interactions compared to the adsorption of SOF and SOF.

Quantitative analysis of SO, HS and CS mixed gases based on ultraviolet differential absorption spectrometry.

SO, HS and CS are the decomposition components of insulating gas SF. The detection of these gases is significant for the online monitoring and fault diagnosis of SF electrical equipment. In this study, an ultraviolet differential optical absorption spectrometry (UV-DOAS) platform for detecting the concentration of SO, HS and CS mixed gases was established and a quantitatively detecting method was proposed.

Ultraviolet Spectral Analysis and Quantitative Detection of Heptafluoroisobutyronitrile (CFN) in a CFN-Carbon Dioxide (CO) Gas Mixture.

As an alternative to sulfur hexafluoride (SF) with great potential for application, heptafluoroisobutyronitrile-carbon dioxide (CFN-CO) gas mixture has been applied in various gas-insulated equipment. The insulation performance of the gas mixture is closely related to the mixing ratio. Therefore, accurate quantification of CFN in the CFN-CO gas mixture has very important engineering significance.

Pristine and Cu decorated hexagonal InN monolayer, a promising candidate to detect and scavenge SF decompositions based on first-principle study.

We carried out the first-principle study of four types of SF decompositions adsorbed on pristine and Cu atom decorated hexagonal InN monolayer. The adsorption structures, adsorption energy, electron transfer, band structure, density of states and desorption properties were discussed to evaluate the possible application of InN monolayer in field of adsorbent and gas sensor. The results revealed that the pristine InN monolayer has the largest adsorption energy to SO with evident chemical interactions.

Abatement of SF in the presence of NH by dielectric barrier discharge plasma.

In this paper, the degradation rate, energy yield and the degradation by-products of SF was studied when different concentrations of NH were added. When NH concentration increased from 0 to 2%, the degradation rate efficiency(DRE) of SF increased from 60% to 97.23% under the flow rate of 50ml/min and 94W input power.

Detection of Ozone and Nitric Oxide in Decomposition Products of Air-Insulated Switchgear Using Ultraviolet Differential Optical Absorption Spectroscopy (UV-DOAS).

Air-insulated switchgear cabinets play a role in the protection and control of the modern power grid, and partial discharge (PD) switchgear is a long-term process in the non-normal operation of one of the situations; thus, condition monitoring of the switchgear is important. The air-insulated switchgear during PD enables the decomposition of air components, namely, O and NO. A set of experimental platforms was designed on the basis of the principle of ultraviolet differential optical absorption spectroscopy (UV-DOAS) to detect O and NO concentrations in air-insulated switchgear.