Thermal Puffing Promoting the Synthesis of N-Doped Hierarchical Porous Carbon-CoO (x) Composites for Alkaline Water Reduction.
Thermal Puffing Promoting the Synthesis of N-Doped Hierarchical Porous Carbon-CoO (x) Composites for Alkaline Water Reduction.
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DOI：
10.1021/acsomega.1c00184
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发表时间：
2021-03-09
期刊：
影响因子：
4.1
通讯作者：
Guo J
中科院分区：
文献类型：
--
作者：
Wei Z;Wang J;Sun J;Zhang Z;Lu B;Guo J
氮掺杂多孔碳基催化剂具有丰富的空穴结构、高比表面积和柔性金属组装体等优点，在析氢反应中具有广阔的应用前景。然而，繁琐的合成工艺和使用高腐蚀性化学品大大增加了生产成本和污染。在此，我们报告了一种简单和环保的热膨化策略，它模仿爆米花形成过程，用于制造N掺杂的分级多孔碳-CoOx催化剂。结果表明，CoOx-NC-1.0在热膨胀过程中具有良好的孔隙率和较高的比表面积（696 m2 g-1）。令人印象深刻的是，所制备的CoOx-NC-1.0具有超低Co负载（0.67重量%），表现出令人钦佩的HER性能，在碱性电解质中以189 mV的过电位驱动10 mA cm-2。特别是CoOx-NC-1.0的活性可以保持70 h的连续试验。CoOx-NC的这种优异性能不仅来自分级多孔结构，而且还归因于较高的石墨-N和吡啶-N的比例，这分别促进了更好的导电性和形成更多的用于HER的活性Co 0。此外，这种策略适用于其他过渡金属基分级多孔复合材料的制备，这为探索替代商业Pt/C的有前途的候选者开辟了新的可能性。
N-doped porous carbon-based catalysts hold great promise for hydrogen evolution reaction (HER) due to their plentiful cavity construction, high specific surface area, and flexible metal assemblies. Nevertheless, the cumbersome synthetic process and the use of highly corrosive chemicals greatly increase the production costs and pollutions. Herein, we report a facile and eco-friendly thermal puffing strategy, which imitates the popcorn forming process, for the fabrication of N-doped hierarchical porous carbon–CoOx catalysts. The results indicate that the well-developed porosity and high specific surface area (696 m2 g–1) of CoOx–NC-1.0 are achieved during the thermal expansion. Impressively, the as-prepared CoOx–NC-1.0 with ultralow Co loading (0.67 wt %) presents admirable HER performance to drive 10 mA cm–2 at an overpotential of 189 mV in the alkaline electrolyte. Especially, the activity of CoOx–NC-1.0 can be maintained for a continuous ∼70 h test. Such an excellent property of CoOx–NC not only derives from the hierarchical porous structure but is also due to the higher ratio of graphitic-N and pyridinic-N, which promotes the better electrical conductivity and formation of more active Co0 for HER, respectively. Moreover, this strategy is applicable to the fabrication of other transition metal-based hierarchical porous composites, which opens new possibilities for exploring promising candidates to substituted commercial Pt/C.
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