Moisture-enabled electricity generation from gradient polyoxometalates-modified sponge-like graphene oxide monolith

• Published in: Journal of materials science Vol. 54; no. 6; pp. 4831 - 4841
• Main Authors: Liu, Jia, Qi, Yan, Liu, Dongping, Dong, Dapeng, Liu, Dedi, Li, Zhenghua
• Format: Journal Article
• Language: English
• Published: New York Springer US 01.03.2019; Springer; Springer Nature B.V
• Subjects: breathing; Characterization and Evaluation of Materials; Chemistry and Materials Science; Classical Mechanics; Crosslinking; Crystallography and Scattering Methods; Electric power generation; electricity generation; electronics; Energy (Physics); Energy harvesting; Energy Materials; Ethylenediamine; Ethylenediamines; Graphene; graphene oxide; Green technology; humans; Humidity; Materials Science; Moisture; Phosphates; phosphotungstic acid; Polymer Sciences; Polyoxometallates; reducing agents; soaking; Solid Mechanics; Tungsten compounds; Graphene Oxide (GO); Free Electron Motion; Porous Carbon Film; Conversion Devices; Monolith
• ISSN: 0022-2461; 1573-4803
• DOI: 10.1007/s10853-018-3183-6

Environmental energy harvesting devices hold great prospect for the next generation electronics, which have attracted intensive attentions recently. In this research, a gradient polyoxometalates-modified graphene oxide (g-POMs-GO) with three-dimensional cross-linking inner structure is synthesized by a weak reductant of GO with ethylenediamine and a special soaking treatment in phosphotungstic acid (HPW). Owing to the gradient introduction of HPW, the as-prepared g-POMs-GO is able to provide moisture-enabled current output of 6.2 uA cm −2 with a power density of ≈ 0.7 mW m −2 by harvesting energy from moisture. Moreover, the humidity-to-electric conversion device of g-POMs-GO provides a new, practical method to track the respiratory activity of subjects and can directly use to record and analyze patterns of human breathing.