In-situ hydrophobic protective layer for suppressing hydrogen evolution corrosion and enabling high-efficiency silicon-air batteries with wide temperature adaptability
Rong Yan , Funing Bian , Jicai Hu , Shulin Gao , Sujuan Hu
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引用次数: 0
Abstract
Silicon (Si), with its high theoretical capacity, highly negative redox potential (−1.69 V vs. SHE), abundance, and low cost, has attracted widespread attention as an anode material for air batteries. However, the specific electric double layer (EDL) between the Si anode and electrolyte causes severe hydrogen evolution corrosion, resulting in a significant deviation of the specific capacity from its theoretical value. To address this issue, a low-cost and high-efficiency additive strategy was developed. By introducing a small amount of dodecyl dimethyl benzyl ammonium bromide (DDBAB), which features a (C2H5)2N+ group that strongly interacts with OH−, and a hydrophobic C12H25 and C2H5, the EDL is altered and an in-situ hydrophobic protective layer is formed. This layer effectively repels active H2O from the Si anode/electrolyte interface and increases the barriers to hydrogen evolution reactions (HER). As a result, the hydrogen evolution inhibition efficiency of Si anode reached 99.36 %. The aqueous silicon-air batteries (SABs) lasted from 173 h to 500 h, and the energy density and specific capacity enhanced by 2.6-fold and 2.7-fold, respectively. Due to the temperature-insensitive binding energy between DDBAB and the Si anode, the quasi-solid-state SABs (QSSSABs), using PAAK-M gel electrolyte, as a proof of concept, exhibit a high specific capacity of 324.54 Ah kg−1, excellent stability across a wide temperature range (−10 °C to 60 °C), and great application potential.
期刊介绍:
Composites Part B: Engineering is a journal that publishes impactful research of high quality on composite materials. This research is supported by fundamental mechanics and materials science and engineering approaches. The targeted research can cover a wide range of length scales, ranging from nano to micro and meso, and even to the full product and structure level. The journal specifically focuses on engineering applications that involve high performance composites. These applications can range from low volume and high cost to high volume and low cost composite development.
The main goal of the journal is to provide a platform for the prompt publication of original and high quality research. The emphasis is on design, development, modeling, validation, and manufacturing of engineering details and concepts. The journal welcomes both basic research papers and proposals for review articles. Authors are encouraged to address challenges across various application areas. These areas include, but are not limited to, aerospace, automotive, and other surface transportation. The journal also covers energy-related applications, with a focus on renewable energy. Other application areas include infrastructure, off-shore and maritime projects, health care technology, and recreational products.