The catalytic boron-hydrogen bond break is usually regarded as an important reaction both in the area of environment treatment and hydrogen energy, attracting increasing attention in the past decades. Due to the limitation of conventional noble metal-based catalyst, cost-effective transition metal-based catalysts with high activity have been recently developed to become the promising candidates. Herein, the coffee ground waste was utilized as the biochar substrate loaded with ultrafine NiCoO₂ nanoparticles. The abundant function groups on the biochar substrate efficiently adsorbed the metal ions and confined the crystal growth spatially, making the NiCoO₂ nanoparticles highly dispersed on the surface. Moreover, the oxygen vacancies were further created in the catalysts by a vacuum-calcination strategy to boost their catalytic activity towards boron-hydrogen bond break both in the systems of 4-nitrophenol reduction by NaBH₄ and hydrogen release from NH₃BH₃. The results indicated that the moderate presence of oxygen vacancies could effectively accelerate the boron-hydrogen bond break and the catalytic activity performed a satisfied stability during several recycles. The the theoretical calculation method was adopted to analysis and discuss the mechanism within this process. This design strategy on active catalysts not only offered a novel solution of biowaste resource reuse but also demonstrated the significant role of oxygen vacancies in energy and environmental catalysis.

在环境处理和氢能领域，催化硼-氢键断裂通常被认为是重要的反应，在过去的几十年中引起了越来越多的关注。由于常规贵金属基催化剂的局限性，近来已经开发了具有成本效益的高活性的过渡金属基催化剂，其成为有前途的候选物。在此，咖啡渣废料被用作装载有超细NiCoO ₂纳米颗粒的生物炭基质。生物炭基质上丰富的官能团有效地吸附了金属离子，并在空间上限制了晶体的生长，从而使NiCoO ₂纳米粒子高度分散在表面上。此外，通过真空煅烧策略在催化剂中进一步产生了氧空位，以提高其在通过NaBH ₄还原4-硝基苯酚和从NH ₃ BH ₃释放氢的系统中对硼氢键断裂的催化活性。。结果表明，适度存在的氧空位可以有效地促进硼-氢键的断裂，并且催化活性在多次循环中表现出令人满意的稳定性。采用理论计算方法对这一过程中的机理进行了分析和讨论。这种基于活性催化剂的设计策略不仅提供了一种生物废物资源再利用的新颖解决方案，而且还证明了氧空位在能源和环境催化中的重要作用。