posted on 2023-11-30, 18:34authored byRunyu Duan, Jiale Zhou, Xiaoyan Ma, Junran Hao, Danying Zhao, Chao Teng, Yahong Zhou, Lei Jiang
Layered
MXene nanofluidic membranes still face the problems of
low mechanical property, poor ion selectivity, and low output power
density. In this work, we successfully constructed heterostructured
membranes with the combination of the layered channels of the MXene
layer on the top and the nanoscale poly(p-phenylene-benzodioxazole)
nanofiber (PBONF) layer on the bottom through a stepwise filtration
method. The as-prepared MXene/PBONF-50 heterogeneous membrane exhibits
high mechanical properties (strength of 221.6 MPa, strain of 3.2%),
high ion selectivity of 0.87, and an excellent output power density
of 15.7 W/m2 at 50-fold concentration gradient. Excitingly,
the heterogeneous membrane presents a high power density of 6.8 W/m2 at a larger testing area of 0.79 mm2 and long-term
stability. This heterogeneous membrane construction provides a viable
strategy for the enhancement of mechanical properties and osmotic
energy conversion of 2D materials.