A Polarization Boosted Strategy for the Modification of Transition Metal Dichalcogenides as Electrocatalysts for Water‐Splitting
Guanyu Chen, Chang Zhang, Shuyan Xue, Ji‐Wei Liu, Yizhe Wang, Yunhao Zhao, Ke Pei, Xue‐Feng Yu, Renchao Che
Abstract
Abstract The design and fabrication of transition metal dichalcogenides (TMDs) are of paramount significance for water‐splitting process. However, the limited active sites and restricted conductivity prevent their further application. Herein, a polarization boosted strategy is put forward for the modification of TMDs to promote the absorption of the intermediates, leading to the improved catalytic performance. By the forced assembly of TMDs (WS 2 as the example) and carbon nanotubes (CNTs) via spray‐drying method, such frameworks can remarkably achieve low overpotentials and superior durability in alkaline media, which is superior to most of the TMDs‐based catalysts. The two‐electrode cell for water‐splitting also exhibits perfect activity and stability. The enhanced catalytic performance of WS 2 /CNTs composite is mainly owing to the strong polarized coupling between CNTs and WS 2 nanosheets, which significantly promotes the charge redistribution on the interface of CNTs and WS 2 . Density functional theory (DFT) calculations show that the CNTs enrich the electron content of WS 2 , which favors electron transportation and accelerates the catalysis. Moreover, the size of WS 2 is restricted caused by the confinement of CNTs, leading to the increased numbers of active sites, further improving the catalysis. This work opens a feasible route to achieve the optimized assembling of TMDs and CNTs for efficient water‐splitting process.