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Title: Tree-inspired lignin microrods-based composite heterogeneous nanochannels for ion transport and osmotic energy harvesting

Journal Article · · Energy Conversion and Management
 [1];  [1];  [1];  [2];  [1]; ORCiD logo [3]
  1. Beijing Forestry Univ. (China)
  2. Beijing Forestry Univ. (China); South China Univ. of Technology (SCUT), Guangzhou (China)
  3. Univ. of Tennessee, Knoxville, TN (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Joint Institute for Biological Sciences (JIBS)

One of the key processes of tree lignification is that lignin penetrates into the cell wall and fills in the cell wall framework, thereby increasing the hardness and hydrophobic of the tree channels, which is beneficial to consolidate and support the tree cell wall and water transport. Inspired by this natural process, we demonstrated a lignin-based nanofluidic heterogeneous membrane that closely mimics the channels in tree, which can realize ion transport function and effectively capture reverse electrodialysis. The membrane was synthesized by heating dealkaline lignin and PVA at 200 °C and this formed fusiform microrods and a closed-packed membrane. Simultaneously, this membrane composited with anodized aluminum (AAO) channels membrane at 200 °C to form asymmetric heterogeneous nanochannels membrane, which can transport counter-ions and harvest osmotic energy. This membrane implements ion current rectification in 0.1 M KCl electrolyte solution at pH 3 due to the confinement of pores and opposite surface charges in lignin-based heterogeneous nanochannel. An output power density of 0.97 W m-2 is obtained under a 50-fold salinity gradient, which can be further improved to 1.19 W m-2 by increasing the salinity gradient from 50-fold to 500-fold. Accordingly, this nanofluidic membranes were prepared by using lignin, the key component in tree, which not only mimicked a crucial process of the water and ionic transport process of channels in tree, but also had the prospect in the field of osmotic energy harvesting.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE; National Natural Science Foundation of China; National Key R&D Program of China; Fundamental Research Funds for the Central Universities; Programme of Introducing Talents of Disciline to Universities; Sate Key Laboratory of Pulp and Paper Engineering
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1844850
Journal Information:
Energy Conversion and Management, Journal Name: Energy Conversion and Management Journal Issue: 1 Vol. 255; ISSN 0196-8904
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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