Yufeng Chen, Zhongling Lang, Kun Feng, Kang Wang, Yangguang Li, Zhenhui Kang, Lin Guo, Jun Zhong, Jun Lu
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引用次数: 0
摘要
氨硼烷(AB)的高效催化有望实现氢燃料的可控能量释放,并解决储氢所面临的成本挑战。在此,我们报告了金属铁晶体结构(R-Fe2O3 泡沫)上的非晶态畴可实现氨硼烷催化性能和稳定性(周转频率 (TOF) 为 113.6 min-1,900 小时内可产生约 771 L H2,10×10 cm2 泡沫的周转频率为 43.27 mL/(min-cm2)),比已报道的基准(45 小时内可产生约 14 L H2)高出至少 20 倍。这些显著的增长得益于稳定的铁晶体结构,而无定形结构域中的缺陷和不饱和原子形成的 Fe-B 中间体可显著降低 H2O 和 AB 的解离障碍。鉴于催化剂的使用寿命是燃料电池实际应用的关键因素,我们的 R-Fe2O3 泡沫还能在驱动的商用汽车燃料电池中以稳定的功率输出(7.8 V 和 1.6 A,至少 5 小时)提供充足的 H2 供应(180 mL H2/分钟,AB 水溶液为 7.5 wt% H2)。考虑到其简便的合成方法,这些材料对于在氢动力汽车中实现耐用的高性能 AB 催化剂和可行的化学储存是非常有潜力的。
Practical H2 supply from ammonia borane enabled by amorphous iron domain
Efficient catalysis of ammonia borane (AB) holds potential for realizing controlled energy release from hydrogen fuel and addressing cost challenges faced by hydrogen storage. Here, we report that amorphous domains on metallic Fe crystal structures (R-Fe2O3 Foam) can achieve AB catalytic performances and stability (turnover frequency (TOF) of 113.6 min−1, about 771 L H2 in 900 h, and 43.27 mL/(min·cm2) for 10×10 cm2 of Foam) that outperform reported benchmarks (most <14 L H2 in 45 h) by at least 20 times. These notable increases are enabled by the stable Fe crystal structure, while defects and unsaturated atoms in the amorphous domains form Fe-B intermediates that significantly lower the dissociation barriers of H2O and AB. Given that the catalyst lifetime is a key determinant for the practical use in fuel cells, our R-Fe2O3 Foam also provides decent H2 supply (180 mL H2/min, AB water solution of 7.5 wt% H2) in a driven commercial car fuel cell at stable power outputs (7.8 V and 1.6 A for at least 5 h). When considered with its facile synthesis method, these materials are potentially very promising for realizing durable high-performance AB catalysts and viable chemical storage in hydrogen powered vehicles.
期刊介绍:
Nature Communications, an open-access journal, publishes high-quality research spanning all areas of the natural sciences. Papers featured in the journal showcase significant advances relevant to specialists in each respective field. With a 2-year impact factor of 16.6 (2022) and a median time of 8 days from submission to the first editorial decision, Nature Communications is committed to rapid dissemination of research findings. As a multidisciplinary journal, it welcomes contributions from biological, health, physical, chemical, Earth, social, mathematical, applied, and engineering sciences, aiming to highlight important breakthroughs within each domain.