Ultra-fine metal particles dispersed on single-walled carbon nanotubes for energy devices
Ultra-fine metal particles dispersed on single-walled carbon nanotubes for energy devices
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DOI：
10.1007/s10853-022-06894-6
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发表时间：
2022-01
影响因子：
4.5
通讯作者：
Y. Ishii;Sae Ishikawa;Itta Yamada;Kohei Kondo;Shinya Jindo;S. Kawasaki;Y. Hattori;O. Mashkov;W. Heiss
中科院分区：
文献类型：
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作者：
Y. Ishii;Sae Ishikawa;Itta Yamada;Kohei Kondo;Shinya Jindo;S. Kawasaki;Y. Hattori;O. Mashkov;W. Heiss
我们通过对单壁碳纳米管进行热处理，将金属配合物（Ni（acac）2，Cu（acac）2）分子包裹在其中空核内，制备了沉积在单壁碳纳米管上的金属纳米颗粒。用同步辐射X射线吸收光谱证实了所得纳米粒子为金属Ni和Cu。电子显微镜测量显示，大多数的金属颗粒的直径小于10 nm，并且它们很好地分散在单壁碳纳米管，甚至在束。在1 M KOH水溶液中，单壁碳纳米管上的Ni金属颗粒通过电化学处理转化为Ni（OH）2颗粒。我们研究了所得Ni（OH）2/SWCNT样品的Ni-MH电池电极性能。我们期望Ni（OH）2/SWCNT作为高功率电池电极工作，因为Ni（OH）2/SWCNT的可逆充/放电容量随扫描速率从2增加到1000 mV/s没有太大变化。Cu/SWCNT与光吸收半导体相结合，可作为CO2光还原催化剂。在光催化剂中，Cu作为金属助催化剂来提高反应效率。我们使用无机半导体TiO 2和有机半导体epindolidine（EPI）。结果表明，Cu/SWCNT/TiO 2和Cu/SWCNT/EPI均能作为CO2光还原催化剂。Cu/SWCNT/EPI催化剂在模拟太阳光（AM 1.5G，100 mW/cm 2）下的外部CO2到CO的量子产率为2.2 × 10− 4%。
We prepared metal nano-particles deposited on SWCNTs by heat-treatment of SWCNTs encapsulating metal complex (Ni(acac)2, Cu(acac)2) molecules inside their hollow cores. It was confirmed by synchrotron radiation x-ray absorption spectra that the obtained nano-particles were metallic Ni and Cu. Electron microscopic measurements revealed that the diameters of most of the metal particles are less than 10 nm and that they were well dispersed on SWCNTs even in the bundles. Ni metal particles on SWCNTs were converted to Ni(OH)2particles by electrochemical treatment in 1 M KOH aqueous solution. We investigated the Ni-MH battery electrode properties of the obtained Ni(OH)2/SWCNT sample. We expect Ni(OH)2/SWCNT to work as high-power battery electrode, because the reversible charge/discharge capacity of Ni(OH)2/SWCNT did not change much with increasing the scan rate from 2 to 1000 mV/s. Cu/SWCNT worked as a CO2photo-reduction catalyst by combing it with light-absorbing semiconductors. In the photo-catalyst, Cu works as a metal co-catalyst to enhance the reaction efficiency. We used inorganic semiconductor TiO2and organic semiconductor epindolidine (EPI). It was found that both Cu/SWCNT/TiO2and Cu/SWCNT/EPI can work as CO2photo-reduction catalyst. The external CO2to CO quantum yield of Cu/SWCNT/EPI catalyst under the simulated solar light (AM1.5G, 100 mW/cm2) was 2.2 × 10−4%.Graphical abstract