当前位置: X-MOL 学术J. Ind. Eng. Chem. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Relationship between Hydrogen Binding Energy and Activity for Hydrogen Evolution Reaction by Palladium Supported on Sulfur-doped Ordered Mesoporous Carbon
Journal of Industrial and Engineering Chemistry ( IF 6.1 ) Pub Date : 2020-09-01 , DOI: 10.1016/j.jiec.2020.06.003
Jong Gyeong Kim , Bongho Lee , Nguyet N.T. Pham , Seung Geol Lee , Chanho Pak

Abstract The performance of a heterogeneous catalyst is determined by the interaction between the support and the metal active site of the catalyst. To investigate the effect of the interaction between sulfur in sulfur-doped ordered mesoporous carbon (SOMC) and palladium (Pd) on hydrogen evolution reaction (HER) activity, a catalyst was prepared with low Pd content supported on SOMC (Pd/SOMC). Sulfur was expected to serve as an anchor for Pd to form smaller nanoparticles. Transmission electron microscopy confirmed that the Pd particle size in Pd/SOMC was smaller than that of Pd supported on pristine ordered mesoporous carbon (Pd/OMC), indicating the improvement of Pd dispersion by the anchoring of sulfur to Pd. HER activity of these catalysts was analyzed from 0.1 V to −0.3 V with a scan rate of 1 mV/s in N2-saturated 0.1 M HClO4 electrolyte. Despite the smaller Pd particle size in Pd/SOMC, Pd/OMC showed better HER activity (7.38 mA/cm2 at −0.15 V) than Pd/SOMC (2.71 mA/cm2). Moreover, overpotential at −10 mA/cm2 for Pd/OMC was 90 mV lower than that for Pd/SOMC. Density functional theory calculations proved that the increase in the binding energy of hydrogen on the Pd in the Pd/SOMC is related to the decrease in HER activity.

中文翻译:

掺硫有序介孔碳负载钯的氢结合能与析氢反应活性的关系

摘要 多相催化剂的性能取决于载体与催化剂金属活性位点之间的相互作用。为了研究硫掺杂有序介孔碳 (SOMC) 中的硫与钯 (Pd) 之间的相互作用对析氢反应 (HER) 活性的影响,制备了一种负载在 SOMC 上的低 Pd 含量的催化剂 (Pd/SOMC)。预计硫将作为 Pd 的锚以形成更小的纳米粒子。透射电子显微镜证实,Pd/SOMC 中 Pd 的粒径小于原始有序介孔碳 (Pd/OMC) 上负载的 Pd,表明通过将硫锚定在 Pd 上改善了 Pd 的分散性。在 N2 饱和的 0.1 M HClO4 电解质中,以 1 mV/s 的扫描速率从 0.1 V 到 -0.3 V 分析这些催化剂的 HER 活性。尽管 Pd/SOMC 中的 Pd 粒径较小,但 Pd/OMC 显示出比 Pd/SOMC(2.71 mA/cm2)更好的 HER 活性(-0.15 V 时为 7.38 mA/cm2)。此外,Pd/OMC 在 -10 mA/cm2 的过电位比 Pd/SOMC 低 90 mV。密度泛函理论计算证明,Pd/SOMC中Pd上氢结合能的增加与HER活性的降低有关。
更新日期:2020-09-01
down
wechat
bug