4.8 Article

Moisture-enabled hydrovoltaic power generation with milk protein nanofibrils

Journal

NANO ENERGY
Volume 102, Issue -, Pages -

Publisher

ELSEVIER
DOI: 10.1016/j.nanoen.2022.107709

Keywords

Protein nanofibrils; Milk; 9-lactoglobulin; Moist -electric generator; Humidity; Hydrovoltaic power generation

Funding

  1. National Natural Science Foundation of China [21876032, 41877045, 42177270]
  2. China Postdoctoral Science Foundation [2021M690728]
  3. Science and Technology Program of Guangzhou, China [202102020788]

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In this study, a moist-electric generator based on protein nanofibrils from milk /9-lactoglobulin was developed and showed superior performance. The device generated high open-circuit voltage and short-circuit current, which is attributed to the unique properties of protein nanofibrils. This study provides a novel perspective for developing high-performance hydrovoltaic devices from biological materials.
Biologic materials have been shown to be good candidates for moisture-enabled hydrovoltaic power generation, but only those from specific bacterial cells have been explored. Herein, we report a moist-electric generator (PN-MEG) based on protein nanofibrils from milk /9-lactoglobulin. The as-developed device can generate an open -circuit voltage of up to 0.65 V and a short-current of 2.9 mu A. This device can generate a maximum power density of 38.88 mu W.cm? 2, which is one order of magnitude larger than those of previously reported analogous devices. The superior performance of this device is attributed to the remarkable hydrophilicity, high ionization and surface-to-volume ratio of protein nanofibrils. Density functional theory (DFT) calculations revealed that carboxyl groups were the favorable active sites in protein nanofibrils for binding water molecules. This study provides a novel perspective for common protein nanofibrils and paves the way for developing high-performance hydrovoltaic devices from biological materials.

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