Abstract：
The design and construction of transition metal catalysts with high performance and low-cost characteristics are imperative for liquid hydrogen storage materials. In this study, we prepared ultrathin carbon-stabilized Co-doped CoxOy nanofilms (C-Co/CoxOy NFs) using an ionic liquid/water interface strategy for sodium borohydride (NaBH4) hydrolysis. Owing to its two-dimensional (2D) NF structure and the protective effects of the composite carbon, the C-Co/CoxOy NF catalyst exhibited remarkable activity and durability for hydrogen generation from NaBH4 hydrolysis. The hydrogen generation rate reached 8055 mL·min-1·gCo-1 (5106 mL·min-1·gCat-1) and the catalyst could be recycled more than 20 times, surpassing most reported metal-based catalysts under comparable conditions. In addition, the exceptional 2D Co-based NF structures, with numerous active sites, assisted in the activation of NaBH4 and water molecules, promoting hydrogen production. Thus, these results provided an in-depth understanding of hydrogen generation from NaBH4 hydrolysis, and an effective strategy for rationally designing highly active and durable 2D NF catalysts.
摘要：
设计和构建具有高性能和低成本特性的过渡金属催化剂对于液氢存储材料势在必行。在这项研究中,我们使用硼氢化钠（NaBH4）水解的离子液体/水界面策略制备了超薄碳稳定的共掺杂CoxOy纳米薄膜（C-Co/CoxOyNFs）。由于其二维（2D）NF结构和复合碳的保护作用，C-Co/CoxOyNF催化剂对NaBH4水解产氢表现出显著的活性和耐久性。氢气生成速率达到8055mL·min-1·gCo-1(5106mL·min-1·gCat-1)，催化剂可循环20次以上，在可比条件下超过大多数报道的金属基催化剂。此外,卓越的2DCo基NF结构，有许多活跃的网站，协助激活NaBH4和水分子，促进氢气生产。因此，这些结果提供了对NaBH4水解产生氢气的深入理解，以及合理设计高活性和耐用的2DNF催化剂的有效策略。
