In this work, dendritic tin-based carbon (Sn/C) nanostructures with four different morphologies were synthesized by a facile two-step carbonization and chemical vapor deposition method and were then evaluated for their performance in hydrogen evolution reaction. The Sn/C dendrites are approximately 0.5–4.5 μm in length, each having secondary branches in different directions. The four morphologies of the Sn/C dendrites namely nanoflowers (Sn_NCF1), nanospheres (Sn_NCF2), nanocubes (Sn_NCF3) and nanocuboids (Sn_NCF4), behave differently in their electrochemical performance, with Sn_NCF2 and Sn_NCF1 performing better. Sn_NCF2 demonstrates optimal HER performance compared to other Sn based samples with onset potential and overpotential of 100 and 260 mV, respectively. The higher electrochemical surface area observed in Sn_NCF2 originated from the presence of more catalytic sites which contributed to the enhanced HER activity and better current density, against other Sn-based samples. In addition to the improved HER performance, Sn_NCF2 demonstrates excellent stability with less than 6% degradation of its initial current after operating for over 8 h in acidic media.

中文翻译：

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原位制备树枝状锡基碳纳米结构用于氢释放反应

在这项工作中，通过简便的两步碳化和化学气相沉积法合成了具有四种不同形态的树枝状锡基碳（Sn / C）纳米结构，然后评估了它们在氢释放反应中的性能。Sn / C树枝状晶体的长度约为0.5-4.5μm，每个树枝状晶体的分支方向都不同。Sn / C树突的四种形态分别是纳米花（Sn_NCF1），纳米球（Sn_NCF2），纳米立方体（Sn_NCF3）和纳米立方体（Sn_NCF4），它们的电化学性能不同，其中Sn_NCF2和Sn_NCF1的性能更好。与起始电位和过电位分别为100和260 mV的其他基于Sn的样品相比，Sn_NCF2表现出最佳的HER性能。在Sn_NCF2中观察到的较高的电化学表面积是由于存在更多的催化位点，这些催化位点与其他基于Sn的样品相比，具有增强的HER活性和更好的电流密度。除了改善的HER性能外，Sn_NCF2还表现出出色的稳定性，在酸性介质中运行8小时以上后，其初始电流的降解低于6％。