A gas nanosensor is an instrument that converts the information of an unknown gas (species, concentration, etc.) into other signals (for example, an electrical signal) according to certain principles, combining detection principles, material science, and processing technology. As an effective application for detecting a large number of dangerous gases, gas nanosensors have attracted extensive interest. However, their development and application are restricted because of issues such as a low response, poor selectivity, and high operation temperature, etc. To tackle these issues, various measures have been studied and will be introduced in this review, mainly including controlling the nanostructure, doping with 2D nanomaterials, decorating with noble metal nanoparticles, and forming the heterojunction. In every section, recent advances and typical research, as well mechanisms, will also be demonstrated.

No abstract

No abstract

In this article, a high concentration adaptive direct methanol fuel cell based on a dual-cavity structure is presented. The performance of the cell is investigated experimentally under different supply concentrations of methanol solution to detect the optimal working conditions. The advantages of the anode doublecavity structure in high concentration and high energy density fuel supply are proved. The effects of stainless steel metal felt, plastic porous barrier layer, hydrophilic and hydrophobic filter membrane on cell performance are experimentally investigated.

No abstract