Catalytic hydrolysis of NaBH4 is a promising method for "on-demand" hydrogen generation, with cobalt catalysts playing a key role due to their high hydrogen generation rates. However, rapid cobalt dissolution and poor recycling hinder stable hydrogen production. This study presents a dual-mode stabilization technique using carbon nitride encapsulation to address these challenges. Co0.8Ni0.2 alloy nanoparticles (NPs) are confined within N-doped mesoporous carbon spheres (NDMCS) and encapsulated with a carbon nitride shell (∼ 5 nm thick). XPS results reveal strong non-classical metal-support interaction, increasing activation energy from 38.82 to 44.6 kJ mol−1, which controls cobalt's reactivity, leading to excellent recycling efficiency (90 % retention of initial rate, no change in particle size) in high-concentration reactants (2 %NaBH4 + 2 %NaOH). The retention rate drops to 26.8 % without this stabilization due to rapid metal dissolution. This stability of Co0.8Ni0.2 alloy in alkaline conditions has significant practical implications for hydrogen generation and other electrochemical applications.

中文翻译：

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增强 Co0.8Ni0.2/NDMCS 催化剂的稳定性：氮化碳封装可实现稳健的氢气生成


NaBH4 催化水解是一种很有前景的“按需”制氢方法，钴催化剂因其高制氢率而发挥着关键作用。然而，钴的快速溶解和回收不良阻碍了稳定的氢气生产。本研究提出了一种使用氮化碳封装的双模稳定技术来应对这些挑战。 Co0.8Ni0.2 合金纳米颗粒 (NP) 被限制在氮掺杂介孔碳球 (NDMCS) 内，并用氮化碳壳（约 5 nm 厚）封装。 XPS 结果揭示了强烈的非经典金属-载体相互作用，将活化能从 38.82 增加到 44.6 kJ mol−1，从而控制钴的反应性，从而在高回收率下实现出色的回收效率（初始速率保留 90%，颗粒尺寸没有变化）。 -浓缩反应物（2%NaBH4 + 2%NaOH）。如果没有这种稳定作用，由于金属快速溶解，保留率会下降至 26.8%。 Co0.8Ni0.2 合金在碱性条件下的这种稳定性对于制氢和其他电化学应用具有重要的实际意义。