Biomimetic Nacre-Like Silk-Crosslinked Membranes for Osmotic Energy Harvesting

ACS Nano
Weiwen XinLiping Wen

Abstract

As an approach to harvesting sustainable energy from ambient conditions, the osmotic energy between river water and seawater contributes to solving global issues such as the energy shortage and environmental pollution. Current attempts based on a reverse electrodialysis technique are limited mainly due to the economically unviable power density and inadequate mass transportation of membrane materials. Here, we demonstrate a benign strategy for designing a multilayer graphene oxide-silk nanofiber-graphene oxide biomimetic nacre-like sandwich as an osmotic power generator. Enhanced interfacial bonding endows the composite membranes with long-term stability in saline, and meanwhile, the two-dimensional nanofluidic channel configuration also reduces the ion transport resistance and provides large storage spaces for ions. Thus, the output power density of the proposed membrane-based generator achieves a value of up to 5.07 W m-2 by mixing seawater and river water. Furthermore, we experimentally and theoretically demonstrate that the thermal-field drives the increased output power density due to the advances in ionic movement range and activity of electrode reaction, showing the promise of strengthened thermo-osmotic energy conversion.

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Citations

Oct 25, 2020·Micromachines·Ding-Cheng Zheng, Li-Hsien Yeh
Mar 13, 2021·Research : a Science Partner Journal·Lulu BaiWenshuai Chen
May 6, 2021·ACS Applied Materials & Interfaces·Nan ShengHuaping Wang
Jun 30, 2021·Chemical Communications : Chem Comm·Shiyi TanQian Shi
Jul 1, 2021·ACS Applied Materials & Interfaces·Ming-Yang WuXing-Hua Xia
Jul 17, 2021·ACS Applied Materials & Interfaces·Lulu FuJin Zhai

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