Lüsi Madis, Erikson Heiki, Treshchalov Alexey, Rähn Mihkel, Merisalu Maido, Kikas Arvo, Kisand Vambola, Sammelselg Väino, Tammeveski Kaido
Institute of Chemistry, University of Tartu, Ravila 14a, 50411 Tartu, Estonia.
Institute of Physics, University of Tartu, W. Ostwald Str. 1, 50411 Tartu, Estonia.
Nanotechnology. 2021 Jan 15;32(3):035401. doi: 10.1088/1361-6528/abbd6f.
In this work He/H plasma jet treatment was used to reduce Pd ions in the aqueous solution with simultaneous deposition of created Pd nanoparticles to support materials. Graphene oxide (GO) and nitrogen-doped graphene oxide (NrGO) were both co-reduced with the Pd ions to formulate catalyst materials. Pd catalyst was also deposited on the surface of carbon black. The prepared catalyst materials were physically characterized using transmission electron microscopy, scanning electron microscopy and x-ray photoelectron spectroscopy. The plasma jet method yielded good dispersion of small Pd particles with average sizes of particles being: Pd/rGO 2.9 ± 0.6 nm, Pd/NrGO 2.3 ± 0.5 nm and Pd/Vulcan 2.8 ± 0.6 nm. The electrochemical oxygen reduction reaction (ORR) kinetics was explored using the rotating disk electrode method. Pd catalyst deposited on nitrogen-doped graphene material showed slightly improved ORR activity as compared to that on the nondoped substrate, however Vulcan carbon-supported Pd catalyst exhibited a higher specific activity for oxygen electroreduction.
在这项工作中，采用He/H等离子体射流处理来还原水溶液中的钯离子，同时将生成的钯纳米颗粒沉积到载体材料上。氧化石墨烯（GO）和氮掺杂氧化石墨烯（NrGO）都与钯离子共同还原，以制备催化剂材料。钯催化剂也沉积在炭黑表面。使用透射电子显微镜、扫描电子显微镜和X射线光电子能谱对制备的催化剂材料进行了物理表征。等离子体射流法使小尺寸钯颗粒得到了良好的分散，颗粒的平均尺寸为：Pd/rGO 2.9±0.6 nm、Pd/NrGO 2.3±0.5 nm和Pd/Vulcan 2.8±0.6 nm。采用旋转圆盘电极法研究了电化学氧还原反应（ORR）动力学。与未掺杂的基底相比，沉积在氮掺杂石墨烯材料上的钯催化剂的ORR活性略有提高，然而，炭黑负载的钯催化剂对氧电还原表现出更高的比活性。
