Nanocellulose/LiCl systems enable conductive and stretchable electrolyte hydrogels with tolerance to dehydration and extreme cold conditions

Ge, Wenjiao; Cao, Shan; Yang, Yang; Rojas, Orlando J.; Wang, Xiaohui

doi:10.1016/j.cej.2020.127306

Cited by 240 publications

(120 citation statements)

References 51 publications

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“…The freezing point of the untreated hydrogel is lower than 0 °C. This is because the functional groups such as amino and hydroxyl groups on the polymer chain can form hydrogen bonds with water molecules, which increases the content of bound water and thus lowers the freezing point [ 46 , 47 ]. The decrease in the freezing point of DN hydrogel is attributed to the formation of a chitosan chain entanglement structure with the aid of NaCl, enhancing the stability of the structure.…”

Section: Resultsmentioning

confidence: 99%

Self-Healing, Self-Adhesive and Stable Organohydrogel-Based Stretchable Oxygen Sensor with High Performance at Room Temperature

Liang

Wei

et al. 2022

Nano-Micro Lett.

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With the advent of the 5G era and the rise of the Internet of Things, various sensors have received unprecedented attention, especially wearable and stretchable sensors in the healthcare field. Here, a stretchable, self-healable, self-adhesive, and room-temperature oxygen sensor with excellent repeatability, a full concentration detection range (0-100%), low theoretical limit of detection (5.7 ppm), high sensitivity (0.2%/ppm), good linearity, excellent temperature, and humidity tolerances is fabricated by using polyacrylamide-chitosan (PAM-CS) double network (DN) organohydrogel as a novel transducing material. The PAM-CS DN organohydrogel is transformed from the PAM-CS composite hydrogel using a facile soaking and solvent replacement strategy. Compared with the pristine hydrogel, the DN organohydrogel displays greatly enhanced mechanical strength, moisture retention, freezing resistance, and sensitivity to oxygen. Notably, applying the tensile strain improves both the sensitivity and response speed of the organohydrogel-based oxygen sensor. Furthermore, the response to the same concentration of oxygen before and after self-healing is basically the same. Importantly, we propose an electrochemical reaction mechanism to explain the positive current shift of the oxygen sensor and corroborate this sensing mechanism through rationally designed experiments. The organohydrogel oxygen sensor is used to monitor human respiration in real-time, verifying the feasibility of its practical application. This work provides ideas for fabricating more stretchable, self-healable, self-adhesive, and high-performance gas sensors using ion-conducting organohydrogels.

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Section: Resultsmentioning

confidence: 99%

Self-Healing, Self-Adhesive and Stable Organohydrogel-Based Stretchable Oxygen Sensor with High Performance at Room Temperature

Liang

Wei

et al. 2022

Nano-Micro Lett.

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“…8Li + -TOCN exhibited best among the samples which presented outstanding compression strength of 72.4 kPa. Lithium ions can enhance the interaction of water molecules in hydrogels (Ge et al 2020). In addition, the compressive strain of the nanocellulose conductive hydrogels with ultrahigh water content and high porosity prepared by this method was about 60%.…”

Section: Mechanical Properties Of Ionic Conductive Tocn Hydrogelsmentioning

confidence: 99%

“…Sun and co-workers rst proposed the concept of ionic skin and used polyacrylamide hydrogel as the ionic conductor, which could be stretched to about six times and the capacitance of the sensor changed as strain (Sun et al 2019;Yan et al 2014). Conductive hydrogels (Cao et al 2020) are concerned as a promising material for ionic skin and bio-sensors due to their hydrophilicity. Flexible strain sensors were required to have good mechanical properties and high conductivity.…”

Section: Introductionmentioning

confidence: 99%

Antifreezing ionotronic skin based on flexible, transparent, and tunable ionic conductive nanocellulose hydrogels

Zhu

Xie

et al. 2021

Cellulose

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Ionic hydrogels with excellent exibility and good conductivity have great potential in diverse electric devices. However, it remains challenging to improve the biocompatibility of ionic hydrogels. Here, natural and environment-friendly cellulose nano ber hydrogels were prepared without adding any organic active materials. The cellulose hydrogel networks with free metal ions (Li + /Ca 2+ /K + ) were obtained by soaking in ion aqueous solution of different concentrations in order to endow tunable conductivity, thus a new kind of transparent ionic hydrogels with both excellent sensing performance obtained by a simple, lowcost and harmless process. The free metal ions locked in the negatively charged nanocellulose network through electrostatic interaction provided adjustable conductivity and sensing performance. Hydrogels doped with 4 mol L − 1 lithium ions exhibited the best sensing performance with the conductivity of 4.36×10 − 4 S cm − 1 , and the current response value was as high as 127%. It was worth noting that the strain-sensitive performance of calcium ions was generally excellent even at low temperatures (-30°C).The antifreezing of the hydrogel improved its service under extreme environment. This kind of hydrogel has great application prospects in arti cial intelligence products, such as human healthy monitoring equipment and soft robotics at subzero temperature.

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“…[156] Electrolyte hydrogels or membranes made of nanocellulose with materials such as graphene oxide, Nafion, and acrylamide/LiCl have been produced to suit the demand for flexible electronic devices, but not specifically supercapacitors. [157][158][159] As nanocellulose has good properties, including high mechanical strength, flexibility, hydrophilicity, surface wettability, and thermal stability, raw biomass materials can be transformed into value-added products, which can promote circular economics while promoting sustainability in nanocomposites production for energy storage. As supercapacitors are among the most promising energy storage devices, it is hardly surprising to believe that the world will one day be able to benefit from advanced findings in this field.…”

Section: Prospects and Limitations Of Nanocellulose-based Supercapacitorsmentioning

confidence: 99%

A Review on Nanocellulose and Its Application in Supercapacitors

Sezali

Ong

Jullok

et al. 2021

Macro Materials & Eng

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Commercially available supercapacitors offer very limited advantages over other energy storage devices. Balancing their electrochemical performance such as capacitance, energy density, and cyclability is challenging. Studies have shown that this challenge can be overcome by using light and cheap substrates that are highly stable with solvents, and have high loading capacities and compatibility with nanomaterials. Nanocellulose, derived from wastes or biomass, is a good candidate for integrating with other nanosize conductive materials, such as carbon, conducting polymers, and metal oxides, as active materials or nanocomposites for supercapacitors. This review focuses on the properties and preparation of nanocellulose sourced from wastes (biomass) and bacteria, and extends to emerging materials, such as metal-organic frameworks and MXene, for nanocellulose-based supercapacitors. Even though supercapacitors are mainly composed of electrodes, electrolytes, and separators, this paper focuses on the overall electrochemical performance of nanocellulose-based supercapacitors to evaluate the influence of nanocellulose. In addition, the potentials and possible limitations of nanocellulose in supercapacitors are discussed. Overall, the incorporation of waste-derived nanocellulose into energy storage applications is an initiative that improves the circular economy and supports environmental sustainability.

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Nanocellulose/LiCl systems enable conductive and stretchable electrolyte hydrogels with tolerance to dehydration and extreme cold conditions

Cited by 240 publications

References 51 publications

Self-Healing, Self-Adhesive and Stable Organohydrogel-Based Stretchable Oxygen Sensor with High Performance at Room Temperature

Self-Healing, Self-Adhesive and Stable Organohydrogel-Based Stretchable Oxygen Sensor with High Performance at Room Temperature

Antifreezing ionotronic skin based on flexible, transparent, and tunable ionic conductive nanocellulose hydrogels

A Review on Nanocellulose and Its Application in Supercapacitors

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