Hydrogen generation from hydrolysis of NaBH4 solution with efficient g-C3N4/Co–Mo–B/Ni foam catalyst
Hydrogen generation from hydrolysis of NaBH4 solution with efficient g-C3N4/Co–Mo–B/Ni foam catalyst
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DOI：
10.1016/j.ijhydene.2023.09.110
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发表时间：
2023-09
影响因子：
7.2
通讯作者：
Jian Ren;Jiaxin Ma;Fengyan Xu;Di Zhang;Kecheng Zhang;Z. Cao;Shiwei Wu;Qingping Sun;Yan Wang;Guode Li
中科院分区：
文献类型：
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作者：
Jian Ren;Jiaxin Ma;Fengyan Xu;Di Zhang;Kecheng Zhang;Z. Cao;Shiwei Wu;Qingping Sun;Yan Wang;Guode Li
硼氢化钠(NaBH4)具有较高的氢气容量，被认为是理想的制氢原料。而低成本、高活性的催化剂是实现NaBH4水解液脱氢的关键。本文采用化学沉积法在298K下成功制备了GC3N4/Co-Mo-B/Ni泡沫催化剂，并通过调节Co2+和MoO42−(n Co2+：nMoO42−)的摩尔比，考察了GC3N4/Co-Mo-B/Ni泡沫催化剂对NaBH4的催化性能。结果表明，当n Co2+：n MoO42−=1：1时，GC3N4/Co-Mo-B/Ni泡沫催化剂的催化性能最佳。在可见光照射下，GC3N4/Co-Mo-B/Ni泡沫的产氢速率和表观活化能分别为9957.7 mLmin−1·g−1和5 2.6kJ−1，明显超过了黑暗条件下的性能(HgR=8372.7 mLmin−1·g−1，Ea=5 5.8kJ−1)。这可能是由于制备过程中Mo2C的出现吸引了GC3N4上的光电子转移，从而促进了NaBH4溶液的光催化降解过程。此外，GC3N4/Co-Mo-B/Ni泡沫催化剂的较小颗粒尺寸和多组分之间的协同作用可能是提高其催化脱氢性能的另一个原因。
Sodium borohydride (NaBH 4) is considered to be a perfect material for hydrogen production in consideration of the high hydrogen capacity. However, the catalyst with low cost and high activity is the key to achieving dehydrogenation from the hydrolysis of NaBH 4 solution. In this work, we successfully synthesized gC 3 N 4/Co–Mo–B/Ni foam catalyst by means of chemical deposition at 298 K. The catalytic property of gC 3 N 4/Co–Mo–B/Ni foam for NaBH 4 hydrolysis was investigated via regulating the molar ratio of Co 2+ and MoO 4 2−(n Co 2+: n MoO 4 2−). The results disclosed that the obtained gC 3 N 4/Co–Mo–B/Ni foam showed the optimum catalytic property when the n Co 2+: n MoO 4 2− value was 1: 1. Its hydrogen generation rate (HGR) and apparent activation energy (E a) were respectively determined to be 9957.7 mL min− 1· g− 1 and 52.6 kJ mol− 1 under visible light irradiation, which has obviously exceeded the performance under darkness (HGR= 8372.7 mL min− 1· g− 1, E a= 55.8 kJ mol− 1). It might attribute to the emergence of Mo 2 C during the preparation process which attracted the photoelectron transfer on gC 3 N 4, thus promoting the photocatalytic hydrolytic process of NaBH 4 solution. Moreover, the smaller grain size and synergistic effect between multiple components could be another reason for heightening the catalytic dehydrogenation property of gC 3 N 4/Co–Mo–B/Ni foam catalyst.