Department of Automotive Science, Graduate School of Integrated Frontier Science, Kyushu University, 744 Motooka, Fukuoka, 819-0395, Japan.
Phys Chem Chem Phys. 2012 Oct 5;14(37):12818-22. doi: 10.1039/c2cp42166f. Epub 2012 Aug 9.
Rapid growth and improved functions of mobile equipment present the need for an advanced rechargeable battery with extremely high capacity. In this study, we investigated the application of fuel cell technology to an Fe-air rechargeable battery. Because the redox potential of Fe is similar to that of H(2), the combination of H(2) formation by the oxidation of Fe with a fuel cell has led to a new type of metal-air rechargeable battery. By decreasing the operating temperature, a deep oxidation state of Fe can be achieved, resulting in enlarged capacity of the Fe-air battery. We found that the metal Fe is oxidized to Fe(3)O(4) by using H(2)/H(2)O as mediator. The observed discharge capacity is 817 mA h g(-1)-Fe, which is approximately 68% of the theoretical capacity of the formation of Fe(3)O(4), 1200 mA h g(-1)-Fe, at 10 mA cm(-2) and 873 K. Moreover, the cycle stability of this cell is examined. At 1073 K, the cell shows a discharge capacity of ca. 800 mA h g(-1)-Fe with reasonably high discharge capacity sustained over five cycles.
移动设备的快速增长和功能提升，对具有超高容量的先进可充电电池提出了需求。在这项研究中，我们研究了燃料电池技术在 Fe-空气可充电电池中的应用。由于 Fe 的氧化还原电位与 H(2)相似，因此通过燃料电池将 Fe 的氧化与 H(2)的形成相结合，产生了一种新型金属-空气可充电电池。通过降低工作温度，可以实现 Fe 的深氧化态，从而扩大 Fe-空气电池的容量。我们发现，金属 Fe 可以被 H(2)/H(2)O 作为介体氧化为 Fe(3)O(4)。观察到的放电容量为 817 mA h g(-1)-Fe，这大约是在 10 mA cm(-2)和 873 K 下形成 Fe(3)O(4)的理论容量 1200 mA h g(-1)-Fe 的 68%。此外，还检查了该电池的循环稳定性。在 1073 K 下，该电池的放电容量约为 800 mA h g(-1)-Fe，具有五个循环以上的高放电容量。
