College of Materials Science and Engineering, Central South University of Forestry and Technology, Changsha 410004, China.
College of Materials Science and Engineering, Central South University of Forestry and Technology, Changsha 410004, China.
Carbohydr Polym. 2022 Oct 15;294:119754. doi: 10.1016/j.carbpol.2022.119754. Epub 2022 Jun 20.
The agglomeration and low conductivity of molybdenum disulfide (MoS) electrocatalysts restrict the presentation of its real intrinsic reaction activity, which leads to challenges for the high-performance hydrogen evolution reaction (HER). Herein, a well-dispersed and superhydrophilic/superaerophobic MoS catalyst with uniform three-dimensional conductive networks have been prepared assisted with cellulose nanofiber (CNF) and carboxylated multi-walled carbon nanotubes (cMWCNT). The resulted CNF/cMWCNT/MoS catalysts present a superhydrophilic/superaerophobic state with contact angles for water and bubble of 0° and 154.1° respectively. This structure effectively disperses MoS nanoparticles through uniform embeddedness and promotes gas-liquid mass transfer via wettability. Benefiting from these optimizations, the CNF/cMWCNT/MoS exhibits better HER performance and a low overpotential (154 mV @ 10 mA/cm). Encourangingly, CNF/cMWCNT/MoS catalysts have a slight decay of 6.99 % at 10 mA/cm after 100 h, while the cMWCNT/MoS shows a decay of 35.83 %. This approach using natural CNF for well-dispersed catalysts provides a potential for high-performance HER electrode design.
二硫化钼（MoS）电催化剂的团聚和低导电性限制了其真实内在反应活性的表现，这给高性能析氢反应（HER）带来了挑战。在此，通过纤维素纳米纤维（CNF）和羧基化多壁碳纳米管（cMWCNT）的辅助，制备了具有均匀三维导电网络的分散性好、超亲水/超疏气的 MoS 催化剂。所得到的 CNF/cMWCNT/MoS 催化剂具有超亲水/超疏气状态，水和气泡的接触角分别为 0°和 154.1°。这种结构通过均匀的嵌入有效地分散了 MoS 纳米颗粒，并通过润湿性促进气液传质。得益于这些优化，CNF/cMWCNT/MoS 表现出更好的 HER 性能和低过电位（10 mA/cm 时为 154 mV）。令人鼓舞的是，在 10 mA/cm 下经过 100 小时后，CNF/cMWCNT/MoS 催化剂的衰减率仅为 6.99%，而 cMWCNT/MoS 的衰减率为 35.83%。这种使用天然 CNF 来制备分散性好的催化剂的方法为高性能 HER 电极设计提供了潜力。
