New energy vehicle new catalyst developed successfully: extending battery life
On February 12th, the Chinese University of Science and Technology professors Lu Junling, Wei Shiqiang, Yang Jinlong and other research groups worked closely together to develop a new type of catalyst, which solved the key problem of the promotion and application of new energy vehicles, hydrogen fuel cell vehicles: The fuel cell carbon monoxide "poisoning shock" crisis, prolong battery life, widen the battery temperature environment, and start normally in the cold winter. The research results were published online today in the internationally authoritative academic journal Nature. Hydrogen is considered to be one of the most promising clean energy sources of the future. Hydrogen fuel cells use the chemical energy released by hydrogen and oxidation reactions to convert into electrical energy, do not need to be burned, have high energy conversion efficiency and zero emissions, and are one of the main development directions of new energy clean power vehicles in the future. However, the development of hydrogen fuel cells faces many challenges. One of the key challenges is the “poisoning†of carbon monoxide in the fuel cell platinum electrode. At present, hydrogen is mainly derived from steam reforming and water gas shift reaction of hydrocarbons such as methanol and natural gas, and the hydrogen thus produced usually contains 0.5% to 2% of carbon monoxide. As the "heart" of hydrogen fuel cell vehicles, the fuel cell platinum electrode is easily "poisoned" by carbon monoxide impurity gas, resulting in degraded battery performance and shortened life, which seriously hinders the promotion of hydrogen fuel cell vehicles. The academic vehicle is more optimistic about the on-board hydrogen purification method, which is to place a specific catalyst at the inlet of the fuel cell, and preferentially react the carbon monoxide impurity gas in the hydrogen with oxygen before the hydrogen enters the fuel cell, thereby preventing the carbon monoxide impurity gas from entering the battery poisoning. electrode. However, existing catalysts can only operate at temperatures above room temperature and very narrow temperatures, making hydrogen fuel cell vehicles unable to be effectively protected during frequent cold starts and difficult to put into practical use. Lu Junling team designed a new type of iron hydroxide atomically dispersed on the platinum surface. The catalyst can be selectively removed 100% selectively in the temperature range of 198-380 Kelvin (about -75 ° C to 107 ° C). A small amount of carbon monoxide in hydrogen fuel. Thus, the novel catalytic material can provide full-time protection for hydrogen fuel cells during frequent cold starts (even under extreme cold conditions of about minus 75 ° C) and continuous operation, avoiding hydrogen fuel cells being poisoned by carbon monoxide. "These findings may greatly accelerate the arrival of the hydrogen fuel cell vehicle era." Lu Junling said that our ultimate goal is to develop an inexpensive, highly active, highly selective carbon monoxide preferential oxidation catalyst that can provide airborne The full-time protection of the fuel cell can also provide an effective means for the preparation of high purity hydrogen in the plant. One reviewer commented: "Compared to other catalyst systems reported in the literature, this inverted monoatomic catalyst performs best in the preferential oxidation of carbon monoxide in a hydrogen-rich atmosphere." Czech Shield,Transparent Protective Shield,Abs Czech Protective Shield,Czech Protective Shield skyshields(suzhou)thermoforming tech.co.ltd , https://www.skyshields.com