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Biodegradable Mg-Mo₂C MXene Air Batteries for Transient Energy Storage.

Shunsuke Yamada¹

¹Department of Robotics, Tohoku University, Room 113, Building No. A15, Area A01, 6-6-01 Aoba, Aramakiaza, Aobaku, Sendaishi, Miyagi 980-8579, Japan.

ACS Applied Materials & Interfaces

|March 18, 2024

Summary

Researchers developed a new bio/ecoresorbable battery using Mo2C MXene cathodes. This innovation boosts operating voltage and power, enabling applications in environmental sensing and implants.

Keywords:

MXene ionic liquid nanomaterial primary battery transient electronics

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Area of Science:

Materials Science
Electrochemistry
Environmental Science

Background:

Primary batteries power small electronics and are crucial for bio/ecoresorbable applications due to their low toxicity.
Current bio/ecoresorbable batteries have limitations in operating voltage and power output, often due to hydrogen evolution reactions (HERs).

Purpose of the Study:

To develop high-performance bio/ecoresorbable batteries with enhanced operating voltage and power.
To suppress undesired hydrogen evolution reactions (HERs) at the cathode in alkaline solutions.

Main Methods:

Utilized Molybdenum Carbide (Mo2C) MXene as a cathode material.
Investigated the energy barriers provided by Mo2C for HERs in alkaline environments.
Fabricated and tested the performance (voltage, power) and degradation of the bio/ecoresorbable battery.

Main Results:

The Mo2C cathode effectively suppressed HERs, allowing oxygen reduction reactions to dominate.
The fabricated battery achieved a high operating voltage of 1.4 V and an areal power of 0.92 mW cm-2.
The battery demonstrated complete degradation within 123 days, leaving benign Mo fragments and biodegradable encapsulation.

Conclusions:

Molybdenum Carbide (Mo2C) MXene is a promising cathode material for high-power, high-voltage bio/ecoresorbable batteries.
This technology offers a viable solution for sustainable power sources in environmental sensing and implantable devices.
The study advances the field of biodegradable electronics with improved performance and environmental compatibility.