Metal-air batteries are promising for the next-generation energy storage because of attractive energy density, but they also face great challenges for applications. To intensify transfer and increase reaction active sites as well as decrease polarization, binder-free flexible three-dimensional porous oxygen electrodes were prepared by in situ deposition and decomposition of ZIF-67 on graphite foam (GF). Compared with GF, the modified sample has a much more stable discharge platform, lower charge/discharge polarization, higher reversibility, and higher reaction activity during oxygen reduction reaction and oxygen evolution reaction processes. The current densities of the reduction peak and oxidation peak of the pristine GF can be improved by a ZIF-67 derivative about 794 and 1367%, respectively. After 100 cycles at 0.1 mA·cm^–2, the R_ct of GF is decreased about 52% by the ZIF-67 derivative. The work paves a promising strategy for oxygen electrodes by combining absorption and electrocatalysis.

中文翻译：

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通过结合微结构和催化来提高锂氧电池性能的无粘合剂柔性三维多孔电极

由于具有吸引力的能量密度，金属-空气电池有望用于下一代储能，但它们也面临着巨大的应用挑战。为了增强转移和增加反应活性位点并减少极化，原位制备无粘合剂柔性三维多孔氧电极ZIF-67 在石墨泡沫 (GF) 上的沉积和分解。与GF相比，改性样品在氧还原反应和析氧反应过程中具有更稳定的放电平台、更低的充放电极化、更高的可逆性和更高的反应活性。ZIF-67 衍生物可将原始 GF 的还原峰和氧化峰的电流密度分别提高约 794% 和 1367%。在 0.1 mA·cm ^{–2 下}循环 100 次后，ZIF-67 衍生物使 GF的R _ct降低了约 52%。该工作通过将吸收和电催化相结合，为氧电极的发展铺平了道路。