Ni–Co–B hollow nanospheres were synthesized by the galvanic replacement reaction using a Co–B amorphous alloy and a NiCl₂ solution as the template and additional reagent, respectively. The Ni–Co–B hollow nanospheres that were synthesized in 60 min (Ni–Co–B-60) showed the best catalytic activity at 303 K, with a hydrogen production rate of 6400 mL_hydrogenmin⁻¹g_catalyst⁻¹ and activation energy of 33.1 kJ/mol for the NaBH₄ hydrolysis reaction. The high catalytic activity was attributed to the high surface area of the hollow structure and the electronic effect. The transfer of an electron from B to Co resulted in higher electron density at Co sites. It was also found that Ni was dispersed on the Co–B alloy surface as result of the galvanic replacement reaction. This, in turn, facilitated an efficient hydrolysis reaction to enhance the hydrogen production rate. The parameters that influenced the hydrolysis of NaBH₄ over Ni–Co–B hollow nanospheres (e.g., NaOH concentration, reaction temperature, and catalyst loading) were investigated. The reusability test results show that the catalyst is active, even after the fifth run. Thus, the Ni–Co–B hollow nanospheres are a practical material for the generation of hydrogen from chemical hydrides.

Ni-Co-B空心纳米球是通过电流置换反应合成的，分别使用Co-B非晶态合金和NiCl ₂溶液作为模板和其他试剂。在60分钟内合成的Ni–Co–B中空纳米球（Ni–Co–B-60）在303 K时表现出最佳的催化活性，氢气产生速率为6400 mL_氢气min ^-1 g_催化剂^-1和活化NaBH _4的能量为33.1 kJ / mol水解反应。高催化活性归因于中空结构的高表面积和电子效应。电子从B转移到Co导致Co位置的电子密度更高。还发现由于电置换反应，Ni分散在Co-B合金表面上。反过来，这促进了有效的水解反应以提高氢的产生速率。影响NaBH ₄水解的参数在Ni-Co-B空心纳米球上（例如，NaOH浓度，反应温度和催化剂载量）进行了研究。可重用性测试结果表明，即使在第五次运行后，该催化剂也具有活性。因此，Ni-Co-B中空纳米球是从化学氢化物产生氢的实用材料。