Hydrazine fuel-cell technology holds great promise for clean energy, not only because of the greater energy density of hydrazine compared to hydrogen but also due to its safer handling owing to its liquid state. However, current technologies involve the use of precious metals (such as platinum) for hydrazine oxidation, which hinders the further application of hydrazine fuel-cell technologies. In addition, little attention has been devoted to the management of gas, which tends to become stuck on the surface of the electrode, producing overall poor electrode efficiencies. In this study, we utilized a nano-hill morphology of vertical graphene, which efficiently resolves the issue of the accumulation of gas bubbles on the electrode surface by providing a nano-rough-edged surface that acts as a superaerophobic electrode. The growth of the vertical graphene nano-hills was achieved and optimized by a scalable plasma-enhanced chemical vapor deposition method. The resulting metal-free graphene-based electrode showed the lowest onset potential (−0.42 V vs saturated calomel electrode) and the highest current density of all the carbon-based materials reported previously for hydrazine oxidation.

中文翻译：

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用于直接肼燃料电池的超好氧石墨烯纳米山

肼燃料电池技术在清洁能源方面具有广阔的前景，这不仅是因为肼的能量密度比氢高，而且由于其液态也更安全。但是，当前的技术涉及将贵金属（例如铂）用于肼氧化，这阻碍了肼燃料电池技术的进一步应用。另外，对气体的管理关注很少，气体的管理趋于卡在电极表面上，从而导致整体电极效率低下。在这项研究中，我们利用了垂直石墨烯的纳米坡度形态，通过提供纳米级粗糙的表面作为超疏水性电极，有效地解决了气泡在电极表面积聚的问题。通过可扩展的等离子体增强化学气相沉积方法，可以实现并优化垂直石墨烯纳米丘的生长。所得的无金属石墨烯基电极显示出最低的起始电势（-0.42 V对饱和甘汞电极）和先前报道过的肼氧化反应中所有碳基材料的最高电流密度。