To save freshwater, people want to replace freshwater with seawater for cooling in industry. However, in seawater cooling system, the corrosion of the outlet of heat-exchanger and its following steel components is ver...To save freshwater, people want to replace freshwater with seawater for cooling in industry. However, in seawater cooling system, the corrosion of the outlet of heat-exchanger and its following steel components is very serious. Application of Al sacrificial anode is one effective method to prevent steel equipment in seawater from corrosion, but at 50℃, Al anodes in common use are not applicable. So it is important to study the relevant rules governing Al anode performance at high temperature. Since the working potential is an important factor affecting the performance of Al anode, we try to find the rules governing how additional elements affect the working potential at various temperature. Twenty-eight kinds of Al sacrificial anode were made for the experiment by the method of the Chinese National Standard GB4948—85. The interrelation of additional elements in the Al anode and the working potential of anode were studied by the method of grey box analysis. The results showed that the influencing order of elements on the working potential was the same on the whole; and that In, Zn, Mg and Ga were good additional elements for aluminum sacrificial anode in order to get negative working potential.展开更多
具有高体积能量密度的钾离子电池有望成为下一代的低成本能源存储设备.金属铋具有较高的理论容量(3763 mA h cm^−3)和相对较低的工作电位(−2.93 Vvs.SHE),是一种很有前途的钾离子电池负极材料.但铋在与钾的合金化过程中,会产生大的体积...具有高体积能量密度的钾离子电池有望成为下一代的低成本能源存储设备.金属铋具有较高的理论容量(3763 mA h cm^−3)和相对较低的工作电位(−2.93 Vvs.SHE),是一种很有前途的钾离子电池负极材料.但铋在与钾的合金化过程中,会产生大的体积膨胀,导致电极容量严重衰减.本文报道了一种柔性、自支撑的铋纳米片/石墨烯复合物电极膜,该电极膜具有优化的孔隙率,可满足电极循环过程中的体积膨胀.此外,该电极中优化的孔隙结构改善了循环过程中的电子和离子输运,并提高了电极在钾化和去钾化过程中的结构稳定性,使其具有良好的电化学储钾性能.特别是,在电流密度为0.5 A g^−1的情况下,该电极的体积容量可以达到451 mA h cm^−3,明显优于之前报道的商用石墨材料.展开更多
文摘To save freshwater, people want to replace freshwater with seawater for cooling in industry. However, in seawater cooling system, the corrosion of the outlet of heat-exchanger and its following steel components is very serious. Application of Al sacrificial anode is one effective method to prevent steel equipment in seawater from corrosion, but at 50℃, Al anodes in common use are not applicable. So it is important to study the relevant rules governing Al anode performance at high temperature. Since the working potential is an important factor affecting the performance of Al anode, we try to find the rules governing how additional elements affect the working potential at various temperature. Twenty-eight kinds of Al sacrificial anode were made for the experiment by the method of the Chinese National Standard GB4948—85. The interrelation of additional elements in the Al anode and the working potential of anode were studied by the method of grey box analysis. The results showed that the influencing order of elements on the working potential was the same on the whole; and that In, Zn, Mg and Ga were good additional elements for aluminum sacrificial anode in order to get negative working potential.
基金This work was supported by the National Natural Science Foundation of China(51902176)China Postdoctoral Science Foundation(2018M631462)+1 种基金Guangdong Innovative and Entrepreneurial Research Team Program(2017ZT07C341)Shenzhen Municipal Development and Reform Commission and the Development and Reform Commission of Shenzhen Municipality for the development of the“Low-Dimensional Materials and Devices”Discipline.
文摘具有高体积能量密度的钾离子电池有望成为下一代的低成本能源存储设备.金属铋具有较高的理论容量(3763 mA h cm^−3)和相对较低的工作电位(−2.93 Vvs.SHE),是一种很有前途的钾离子电池负极材料.但铋在与钾的合金化过程中,会产生大的体积膨胀,导致电极容量严重衰减.本文报道了一种柔性、自支撑的铋纳米片/石墨烯复合物电极膜,该电极膜具有优化的孔隙率,可满足电极循环过程中的体积膨胀.此外,该电极中优化的孔隙结构改善了循环过程中的电子和离子输运,并提高了电极在钾化和去钾化过程中的结构稳定性,使其具有良好的电化学储钾性能.特别是,在电流密度为0.5 A g^−1的情况下,该电极的体积容量可以达到451 mA h cm^−3,明显优于之前报道的商用石墨材料.
基金supported by the National Natural Science Foundation of China(91963118 and 52173246)Science Technology Program of Jilin Province(20200201066JC)the 111 Project(B13013)。
