Zhu Yongyang, Ouyang Liuzhang, Zhong Hao, Liu Jiangwen, Wang Hui, Shao Huaiyu, Huang Zhenguo, Zhu Min
School of Materials Science and Engineering, Guangdong Provincial Key Laboratory of Advanced Energy Storage Materials, South China University of Technology, Guangzhou, 510641, P. R. China.
China-Australia Joint Laboratory for Energy & Environmental Materials, Key Laboratory of Fuel Cell Technology of Guangdong Province, Guangzhou, 510641, P. R. China.
Angew Chem Int Ed Engl. 2020 May 25;59(22):8623-8629. doi: 10.1002/anie.201915988. Epub 2020 Mar 24.
Sodium borohydride (NaBH ) is among the most studied hydrogen storage materials because it is able to deliver high-purity H at room temperature with controllable kinetics via hydrolysis; however, its regeneration from the hydrolytic product has been challenging. Now, a facile method is reported to regenerate NaBH with high yield and low costs. The hydrolytic product NaBO in aqueous solution reacts with CO , forming Na B O ⋅10 H O and Na CO , both of which are ball-milled with Mg under ambient conditions to form NaBH in high yield (close to 80 %). Compared with previous studies, this approach avoids expensive reducing agents such as MgH , bypasses the energy-intensive dehydration procedure to remove water from Na B O ⋅10 H O, and does not require high-pressure H gas, therefore leading to much reduced costs. This method is expected to effectively close the loop of NaBH regeneration and hydrolysis, enabling a wide deployment of NaBH for hydrogen storage.
硼氢化钠（NaBH₄）是研究最多的储氢材料之一，因为它能够在室温下通过水解以可控的动力学释放高纯度氢气；然而，从水解产物中再生硼氢化钠一直具有挑战性。现在，报道了一种简便的方法，能够以高产率和低成本再生硼氢化钠。水溶液中的水解产物硼酸钠（NaBO₂）与二氧化碳反应，生成十水四硼酸钠（Na₂B₄O₇·10H₂O）和碳酸钠（Na₂CO₃），在环境条件下将它们与镁一起进行球磨，以高产率（接近80%）生成硼氢化钠。与之前的研究相比，这种方法避免了使用昂贵的还原剂，如氢化镁（MgH₂），绕过了从十水四硼酸钠中去除水的耗能脱水过程，并且不需要高压氢气，因此大大降低了成本。该方法有望有效地闭合硼氢化钠再生和水解的循环，使硼氢化钠在储氢领域得到广泛应用。
