做英文会议汇报，润色如下段落
Dear [Conference Chair/Panelists/Organizers],
Good morning, ladies and gentlemen. It is my great pleasure to be here today as the keynote speaker for 14th Asian Conference On Chemical Sensors. I would like to express my sincere gratitude for inviting me to share my insights on mixed potential gas sensors. I have spent considerable time investigating gas sensors, and I believe that my findings can contribute to the existing body of knowledge in this field. Throughout my presentation, I will provide an overview of my research methodology, highlight key findings, and discuss their implications for future research and practical applications.

Gas sensors have a wide range of applications in various fields of human production and life, including medical health, industrial production, environmental monitoring, and many others. Different types of gas sensors, such as semiconductor and quartz crystal microbalance sensors, etc. have experienced rapid development in recent years. 

According to Mordor Intelligence’s statistics for 2022, the market share of different types of sensors is shown in the figure, with electrochemical gas sensors accounting for the highest proportion, approximately 53%.

Based on the types of electrolytes, electrochemical gas sensors can be roughly divided into ion liquid electrolyte electrochemical gas sensors and solid electrolyte electrochemical gas sensors. Ion liquid electrolytes have higher costs and lower safety, while compared to them, solid electrolytes have many advantages such as stable properties and lower detection limits. They have become a hot research topic in recent years. Common types of solid electrolyte electrochemical gas sensors include current-type, equilibrium potential-type, and mixed potential-type gas sensor.

Both equilibrium potential-type and mixed potential-type sensors use voltage as output signals, but their sensitive mechanisms are different. The equilibrium potential-type gas sensor only undergoes one electrochemical reaction between the sensitive electrode and the reference electrode, and its response value complies with the Nernst equation. On the other hand, for mixed potential-type gas sensors, multiple electrochemical reactions occur on the sensitive electrode due to the target gas, and the response value does not follow the Nernst equation. The mixed potential theory has also undergone a long period of development, starting from its proposal in 1977, and has been explored extensively since then.

Currently, research on mixed potential-type gas sensors mainly focuses on the following three aspects.

The first parts is to explore new electrode materials. Developing high-performance sensitive electrode materials is an effective way to improve gas sensor sensitivity. Various materials with different crystal structures such as perovskite and spinel type and so on are used as sensitive electrodes to detect various gases. Doping sensitive electrode materials with noble metals is also an effective approach to enhance sensor stability and selectivity. Some noble metals such as gold, silver, and platinum are commonly used as doping metals to improve sensor performance.

The second method is to construct an efficient three-phase boundary. The boundary between the sensitive electrode material, solid electrolyte, and analyte is usually referred to as the three-phase boundary. The three-phase boundary is the place where the gas undergoes electrochemical reactions. And increasing the size of the boundary can generate more active electrochemical reaction sites, thus improving the gas sensor’s sensitivity.

The third method is the development of novel solid electrolytes. In the previously mentioned application areas of gas sensors, the working temperature ranges from room temperature to above 600℃. To address this issue, various types of electrolytes such as oxygen ion conductors, sodium ion conductors, and potassium ion conductors are used as solid electrolytes to expand the operating temperature range of mixed potential-type gas sensors.

Combining the aforementioned research background, this presentation will introduce the progress made in recent 5 years by our laboratory in developing sensitive electrode materials, constructing efficient three-phase boundaries, and exploring novel solid electrolytes. It will also discuss sensor modification methods related to the essential nature of mixed potential sensing mechanisms, including temperature and electrode potential and so on. Finally, some work on the development of practical gas sensor systems conducted by our laboratory will be presented as well.

First, the development of new sensitive electrode materials for constructing high-performance mixed potential-type gas sensors is introduced. The focus of electrode material research is on exploring new materials and developing various crystal structures such as perovskite and spinel for use as sensitive electrodes in sensors. Based on this, the porosity of the materials is controlled by changing the sintering temperature, which affects gas transport and reaction processes, thereby improving the gas sensor’s sensitivity. Doping electrode materials is also an effective method for constructing high-performance sensitive electrode materials. Common noble metal elements such as gold, silver, and platinum are used to enhance sensor selectivity and stability. 

YSZ electrolyte is a widely used oxygen ion conductor electrolyte, which has broad application prospects in high-temperature gas detection, such as the detection of sulfides, NOX, VOCs in automobile exhaust. In this part, the research progress of novel electrode materials for mixed potential-type gas sensors will be discussed according to the types of electrolyte.