Zhu Yongyang, Zhong Hao, Wang Hui, Ouyang Liuzhang, Liu Jiangwen, 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, People's Republic of China.
China-Australia Joint Laboratory for Energy & Environmental Materials, Key Laboratory of Fuel Cell Technology of Guangdong Province, Guangzhou, 510641, People's Republic of China.
Chemistry. 2021 Jun 21;27(35):9087-9093. doi: 10.1002/chem.202100552. Epub 2021 May 26.
A significant obstacle in the large-scale applications of sodium borohydride (NaBH ) for hydrogen storage is its high cost. Herein, we report a new method to synthesize NaBH by ball milling hydrated sodium tetraborate (Na B O ⋅ 10H O) with low-cost Al or Al Si , instead of Na, Mg or Ca. An effective strategy is developed to facilitate mass transfer during the reaction by introducing NaH to enable the formation of NaAlO instead of dense Al O on Al surface, and by using Si as a milling additive to prevent agglomeration and also break up passivation layers. Another advantage of this process is that hydrogen in Na B O ⋅ 10H O serves as a hydrogen source for NaBH generation. Considering the low cost of the starting materials and simplicity in operation, our studies demonstrate the potential of producing NaBH in a more economical way than the commercial process.
硼氢化钠（NaBH₄）大规模应用于储氢的一个重大障碍是其成本高昂。在此，我们报告一种通过球磨水合硼酸钠（Na₂B₄O₇·10H₂O）与低成本的铝或铝硅合金（而非钠、镁或钙）来合成NaBH₄的新方法。我们开发了一种有效策略，通过引入氢化钠使铝表面形成偏铝酸钠而非致密的氧化铝，从而促进反应过程中的传质，并使用硅作为球磨添加剂以防止团聚并打破钝化层。该过程的另一个优点是，水合硼酸钠中的氢作为生成NaBH₄的氢源。考虑到起始原料成本低且操作简单，我们的研究表明，与商业工艺相比，该方法具有以更经济的方式生产NaBH₄的潜力。
