Abstract
Osmotic energy conversion technology plays an increasingly important role as clean energy alternatives. However, the excessive use of non-renewable materials in osmotic energy harvesting can lead to serious environmental pollution. Herein, we design a low-cost, eco-friendly, and high-ion-conductance ionic cable directly from natural Eucommia ulmoides bark owing to its unique sandwich structure and abundant charged nanochannels within the well-aligned lignocellulose nanofibers. In the cable, the natural biopolymer E. ulmoides gum (EUG) acts as a bio-adhesive tightly holding cellulose fibers together, rendering it with high morphological stability. The as-prepared ionic cable shows excellent ion conductance of 3.36 × 10−3 S cm−1, far surpassing the performance of natural bark (2.58 × 10−4 S cm−1). This work utilizes the natural E. ulmoides bark components and its unique lignocellulose-EUG sandwich structure to construct fully biomass-based cable with high-ion-conductance and water-stable, providing a sustainable strategy to accelerate the implementation of clean osmotic energy harvesting and forest waste utilization.
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