Rechargeable PEM Fuel-Cell Batteries Using Quinones as Hydrogen Carriers
Rechargeable PEM Fuel-Cell Batteries Using Quinones as Hydrogen Carriers
复制标题
DOI：
10.1149/2.0611504jes
复制
发表时间：
2015
影响因子：
3.9
通讯作者：
M. Nagao;Kazuyo Kobayashi;Yuta Yamamoto;T. Hibino
中科院分区：
文献类型：
--
作者：
M. Nagao;Kazuyo Kobayashi;Yuta Yamamoto;T. Hibino
采用有机化学物质作为储氢介质的可充电燃料电池（RFCB）具有作为下一代电源的潜力;然而，氢的可逆储存和释放仍然是一个重大挑战。特别地，在电池充电期间有机化合物的氢化难以实现100%转化。然而，该报告表明，醌类，特别是蒽醌（AQ），可以作为RFCB的氢载体，其中AQ在充电期间氢化为蒽醌（AH 2 Q），AH 2 Q在放电期间脱氢为AQ。该氧化还原反应在比氢还原更正的电势下发生，使得可以通过将充电电压调节至IV来避免不期望的氢产生。所得RFCB在室温下保持各自初始性能的100%的电容量，在50°C下保持各自初始性能的91%，并且在75°C下保持各自初始性能的63%，在300次循环后库仑效率大于90%。此外，RFCB用作能量密度为0.8-3.4 Wh kg-1、功率密度为9.5-258.9 W kg-1的二次电池，并且用作功率密度为0.001-0.26 W cm-3的燃料电池。基于性能和退化数据，这种RFCB的局限性和未来的研究方向进行了讨论。
Rechargeable fuel-cell batteries (RFCBs) that employ organic chemical hydrides as hydrogen storage media have potential as next-generation power sources; however, the reversible storage and release of hydrogen remains a significant challenge. In particular, the hydrogenation of organic compounds during cell charge is difficult to achieve with 100% conversion. However, this report demonstrates that quinones, especially anthraquinone (AQ), can function as a hydrogen carrier for RFCBs, where AQ is hydrogenated to anthrahydroquinone (AH2Q) during charge and AH2Q is dehydrogenated to AQ during discharge. This redox reaction occurred at a more positive potential than that for hydrogen reduction, so that undesired hydrogen production can be avoided by adjusting the charge voltage to 1 V. The resulting RFCB maintained 100% electrical capacity at room temperature, 91% at 50°C, and 63% at 75°C of the respective initial performance with coulombic efficiencies greater than 90% after 300 cycles. Moreover, the RFCB functioned as a secondary battery with energy densities of 0.8–3.4 Wh kg−1, power densities of 9.5–258.9 W kg−1, and as a fuel cell with power densities of 0.001–0.26 W cm−3. Based on the performance and degradation data, the limitations of this RFCB and directions for future research are discussed.