Low-temperature plasma modified Vulcan XC72R as a support to enhance the methanol oxidation performance of Pt nanoparticles
Low-temperature plasma modified Vulcan XC72R as a support to enhance the methanol oxidation performance of Pt nanoparticles
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低温等离子体改性Vulcan XC72R作为载体增强Pt纳米粒子的甲醇氧化性能
DOI：
10.1016/j.ijhydene.2022.07.092
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发表时间：
2022-08
影响因子：
7.2
通讯作者：
Guohua Ni
中科院分区：
文献类型：
--
作者：
Hongmei Sun;Zhongyang Ma;Siyuan Sui;Yanjun Zhao;Xuemei Ren;Guohua Ni
Vulcan XC72R作为一种炭素材料，被广泛用作沉积金属催化剂的载体。然而，其孔径小、分散困难、位置稀少等限制了其应用。在本工作中，我们采用低温等离子体对火神XC72R进行表面改性。检测到，经过长时间的等离子体辐照后，其原始形貌和结构发生了很大变化。随着处理时间的延长，孔尺寸增大，比表面积减小，孔体积先增大后减小。同时，Vulcan XC72R的外表面被剥离成超薄的纳米片，并接枝上含氧官能团。与未处理的Vulcan XC72R相比，处理后的Vulcan XC72R负载的铂纳米粒子对甲醇氧化反应具有更高的催化活性和更长的循环稳定性。这项研究表明，等离子体是一种有效的方法来调节Vulcan XC72R的孔径和表面功能化。经RF-CCP处理的Vulcan XC72R的外表面被剥离成超薄的纳米片，孔尺寸和孔体积增大。以部分剥离的Vulcan XC72R为载体的铂纳米粒子尺寸较小(2.31±0.69 nm)，表现出良好的甲醇氧化性能。·火神XC72R的外表面被剥离成超薄的纳米片。·等离子体处理的Vulcan XC-72R的孔径是未经处理的Vulcan XC-72R的两倍。·等离子体处理的Vulcan XC72R负载的铂纳米颗粒尺寸小，分布均匀。
Vulcan XC72R as a kind of carbon material is widely used as a support to deposit metal catalysts. However, its low pore size, the difficulty of dispersion, and the rare sites have limited its application. In this work, we modified the surface of Vulcan XC72R by low-temperature plasma. It is detected that its original morphology and structure have been greatly changed by longtime plasma irradiation. The pore size increased and the specific surface area decreased with the increasing treatment time, while the pore volume initially increased and then decreased. Meanwhile, the outside surfaces of Vulcan XC72R were exfoliated to ultra-thin nanosheets and grafted with the oxygen-containing functional groups. Compared with the untreated Vulcan XC72R, Pt nanoparticles supported on treated Vulcan XC72R with smaller size exhibited higher catalyst activity and longer cyclic stability for the methanol oxidation reaction. This study demonstrates that plasma is an efficient approach to tuning the pore size and functionalizing the surface of Vulcan XC72R. The outside surfaces of Vulcan XC72R treated by RF-CCP were exfoliated to ultra-thin nanosheets, meanwhile the pore size and the pore volume increased. The small size (2.31 ± 0.69 nm ) of Pt nanoparticles anchored on partially exfoliated Vulcan XC72R exhibited excellent performance for methanol oxidation. • The outside surfaces of Vulcan XC72R were exfoliated to ultra-thin nanosheets. • The pore size of Vulcan XC-72R treated by plasma was twice in comparison with untreated Vulcan XC-72R. • Pt nanoparticles supported on plasma-treated Vulcan XC72R displayed small size and uniform distribution.
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