Cobalt Carbonate Hydroxide Nanowire Array on Ti Mesh: An Efficient and Robust 3D Catalyst for On‐Demand Hydrogen Generation from Alkaline NaBH₄ Solution

Abstract

In this work, for the first time, a cobalt carbonate hydroxide (Co(CO ) (OH)⋅0.11 H O) nanowire array on Ti mesh (CHNA/Ti) was applied to drive the dehydrogenation of alkaline NaBH solution for on-demand hydrogen production. Compared with other nanostructured Co-based catalyst systems, CHNA/Ti can be activated more quickly and separated easily from fuel solutions. This self-supported cobalt salt nanowire array catalyst works as an efficient and robust 3D catalyst for the hydrolysis reaction of NaBH with a hydrogen generation rate of 4000 mL min g and a low apparent activation energy of 39.78 kJ mol and offers an attractive system for on-demand hydrogen generation.

A Bunch‐like Copper Oxide Nanowire Array as an Efficient, Durable, and Economical Catalyst for the Methanolysis of Ammonia Borane

“…The self-supported b-CuO NA/CF catalyst has more advantages than traditional powder catalysts ystems in this respect. [29,30,43] As shown in Figure 4a,t he methanolysis process can be well controlled by b-CuO NA/CF.I ft he b-CuO NA/CF (ON) catalysti s separated from the fuel solution,t he reaction stops quickly (OFF),w hereas in the presence of the catalyst hydrogen release occurs immediatelyw ith almost the same rate, and this demonstrates the good sensitivity and stability of b-CuO NA/ CF for AB methanolysis. The recyclability of the b-CuO NA/CF catalystw as also examined in the methanolysis of AB (Figure 4b).…”

“…However, all of these Cu‐based catalysts, including other metal‐based catalyst systems, have powder‐like structures, and they suffer from easy aggregation, are difficult to reuse, and under undergo mass loss in continuous flow systems. In our previous work, we proved that self‐supported nanostructures could solve the above issues . Thus, although challenging, it would be highly desirable to develop an economical self‐supported nanostructured Cu‐based catalyst for the efficient and stable methanolysis of AB for hydrogen production.…”

“…In flow fuel systems for practical applications, controllability and stability are vital for the dehydrogenation catalyst. The self‐supported b‐CuO NA/CF catalyst has more advantages than traditional powder catalyst systems in this respect . As shown in Figure a, the methanolysis process can be well controlled by b‐CuO NA/CF.…”

“…In our previous work, we provedt hat selfsupported nanostructures could solve the above issues. [29][30][31] Thus, although challenging, it would be highly desirable to develop an economical self-supported nanostructured Cu-based catalystf or the efficient and stable methanolysis of AB for hydrogen production.In this work, for the first time, ab unch-like CuO nanowire array on copperf oam (b-CuO NA/CF) was developedt hrough af acile and economical method, and this nanowire array was found to behave as an efficient catalystf or the methanolytic dehydrogenation of AB. b-CuO NA/CFw as found to exhibit high catalytic activityf or the methanolysis of AB with an initial turnover frequency (TOF)o f1 3.3 mol H 2 mol CuO À1 min À1 and an activation energy of 34.7 kJ mol À1 .M oreover,t his self-supported bunch-like nanoarray catalystc ould be easily separated from fuel solutions with excellent stabilitya nd maintained its catalytic activity even after prolonged use.b-CuO NA/CF was derivedthrough simple thermaltreatment of its Cu(OH) 2 NA/CFp recursor,w hich was preparedb yf acile in situ wet-oxidation treatment of copperf oam (CF) at room temperature (Figure 1a).…”

“…In our previous work, we provedt hat selfsupported nanostructures could solve the above issues. [29][30][31] Thus, although challenging, it would be highly desirable to develop an economical self-supported nanostructured Cu-based catalystf or the efficient and stable methanolysis of AB for hydrogen production.…”