Amorphous Alloy Architectures in Pore Walls: Mesoporous Amorphous NiCoB Alloy Spheres with Controlled Compositions via a Chemical Reduction
Amorphous Alloy Architectures in Pore Walls: Mesoporous Amorphous NiCoB Alloy Spheres with Controlled Compositions via a Chemical Reduction
复制标题
DOI：
10.1021/acsnano.0c07178
复制
发表时间：
2020-12-22
期刊：
影响因子：
17.1
通讯作者：
Asahi, Toru
中科院分区：
文献类型：
--
作者：
Kang, Yunqing;Jiang, Bo;Asahi, Toru
非晶态双金属硼化物是一类新兴的催化纳米材料，由于其类玻璃结构、丰富的不饱和活性中心和协同电子效应而显示出优异的催化性能。然而，创造具有可调金属比例的富含地球的介孔双金属硼化物仍然是一个挑战。在这里，我们开发了一种复杂且可控的双还原剂策略，通过软模板指导组装的方法合成了组成可调的介孔镍钴硼(NiCoB)非晶态合金球(AASS)。选择使用四丁基溴化膦(Bu4PBr)有利于生成定义明确的中孔，因为它既可以通过减少M2+物种的还原能力来减缓还原速度，又可以防止肥皂泡的产生。我们的介孔分子筛Ni10.0Co74.5B15.5对氨基硼烷(AB)的水解脱氢反应具有最高的催化性能。它的高性能归功于Ni、Co和B之间的最佳协同效应以及由于开放的介孔而具有的高比表面积和良好的传质效率。这项工作描述了一种系统的方法来设计和合成作为高效催化剂的介孔双金属硼化物。
Amorphous bimetallic borides are an emerging class of catalytic nanomaterial that has demonstrated excellent catalytic performance due to its glass-like structure, abundant unsaturated active sites, and synergistic electronic effects. However, the creation of mesoporous Earth-abundant bimetallic metal borides with tunable metal proportion remains a challenge. Herein, we develop a sophisticated and controllable dual-reducing agent strategy to synthesize the mesoporous nickel-cobalt boron (NiCoB) amorphous alloy spheres (AASs) Meso-NiCOB AASs with adjustable compositions by using a soft template-directed assembly approach. The selective use of tetrabutylphosphonium bromide (Bu4PBr) is beneficial to generate well-defined mesopores because it both moderates the reduction rate by decreasing the reducibility of M2+ species and prevents the generation of soap bubbles. Our meso-Ni10.0Co74.5B15.5 AASs generate the highest catalytic performance for the hydrolytic dehydrogenation of ammonia borane (AB). Its high performance is attributed to the combination of optimal synergistic effects between Ni, Co, and B as well as the high surface area and the good mass transport eff iciency due to the open mesopores. This work describes a systematic approach for the design and synthesis of mesoporous bimetallic borides as efficient catalysts.