Yamada Shunsuke
Department of Robotics, Tohoku University, Room 113, Building No. A15, Area A01, 6-6-01 Aoba, Aramakiaza, Aobaku, Sendaishi, Miyagi 980-8579, Japan.
ACS Appl Mater Interfaces. 2024 Mar 27;16(12):14759-14769. doi: 10.1021/acsami.3c17692. Epub 2024 Mar 18.
Primary batteries are the fundamental power sources in small electronic gadgets and bio/ecoresorbable batteries. They are fabricated from benign and biodegradable materials and are of interest in environmental sensing and implants because of their low toxicity toward the environment and human body during decomposition. However, current bio/ecoresorbable batteries suffer from low operating voltages and output powers because of the occurrence of undesired hydrogen evolution reactions (HERs) at cathodes. Herein, MoC MXene was used as a cathode to achieve high operating voltage and areal power. MoC provides energy barriers for HERs in alkaline solutions, and such barriers suppress HERs and allow the oxygen reduction reaction to dominate at the cathode. The fabricated battery exhibits an operating voltage and areal power of 1.4 V and 0.92 mW cm, respectively. Degradation tests show that the full cell completely degrades within 123 days, leaving only Mo fragments from the electrode and biodegradable encapsulation. This study provides insights into bio/ecoresorbable batteries with high power and operating voltage, which can be used for environmental sensing.
一次电池是小型电子设备以及生物/可生物降解电池中的基本电源。它们由良性且可生物降解的材料制成，由于在分解过程中对环境和人体的毒性较低，因此在环境传感和植入物领域受到关注。然而，当前的生物/可生物降解电池由于在阴极发生不期望的析氢反应（HERs），存在工作电压和输出功率较低的问题。在此，碳化钼（MoC）MXene被用作阴极以实现高工作电压和面积功率。MoC在碱性溶液中为HERs提供能量势垒，这种势垒抑制了HERs，并使氧还原反应在阴极占主导地位。所制备的电池分别表现出1.4 V的工作电压和0.92 mW/cm²的面积功率。降解测试表明，全电池在123天内完全降解，仅留下电极中的钼碎片和可生物降解的封装材料。这项研究为具有高功率和工作电压的生物/可生物降解电池提供了见解，可用于环境传感。
