The research aims to study the effect of adding mischmetal (Mm) to the TiFe0.86Mn0.07Co0.07alloy on its hydrogen storage performance and cyclic stability. The results show that TiFe0.86Mn0.07Co0.07+ x% Mm (x = 0,4,6,8) alloys can be easily activated. The hydrogen absorption capacity of TiFe0.86Mn0.07Co0.07+ 4% Mm reaches 1.76 wt% (mass fraction) at 298 K. With the increase of Mm addition, the hydrogen storage capacity decreases slightly. Furthermore, after 40 absorption and desorption cycles in hydrogen containing 250 ppm O2, the alloy still has 36% of its initial hydrogen storage capacity, and the alloy can recover 93% of its hydrogen storage capacity through heat treatment.Keywords:TiFe hydrogen storage alloys;life test;impure hydrogen gas;cyclic stability
Xiaojuan Cao,Xiaoyu Yan,Kai Zhao,Le Ke,Xiaoyi Jiang,Lingjiao Li,Ning Yan
Electrochemical energy storage is a promising technology for the integration of renewable energy. Lead-acid battery is perhaps among the most successful commercialized systems ever since thanks to its excellent cost-effectiveness and safety records. Despite of 165 years of development, the low energy density as well as the coupled power and energy density scaling restrain its wider application in real life. To address this challenge, we optimized the configuration of conventional Pb-acid battery to integrate two gas diffusion electrodes. The novel device can work as a Pb-air battery using ambient air, showing a peak power density of 183 mW cm −2 , which was comparable with other state-of-the-art metal-O 2 batteries. It can also behave as a fuel cell, simultaneously converting H 2 and air into electricity with a peak power density of 75 mW cm −2 . Importantly, this device showed little performance degradation after 35 h of the longevity test. Our work shows the exciting potential of lead battery technology and demonstrates the importance of battery architecture optimization toward improved energy storage capacity.
危险品化学品经营许可证（带存储）