Physical and chemical mechanisms that influence the electrical conductivity of lignin-derived biochar
Physical and chemical mechanisms that influence the electrical conductivity of lignin-derived biochar
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DOI：
10.1016/j.cartre.2021.100088
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发表时间：
2021-10-01
期刊：
影响因子：
--
通讯作者：
Ryan, Cecily
中科院分区：
文献类型：
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作者：
Kane, Seth;Ulrich, Rachel;Ryan, Cecily
木质素衍生的生物炭是石油基碳粉（例如，炭黑）用于聚合物复合材料和能量存储应用。这些生物炭的先前研究表明，高电导率和良好的电容行为是可实现的。然而，这些研究还显示生物炭之间的电导率具有很高的可变性（类似于10（-2）-10（2）S/cm）。导致这些木质素衍生的生物炭具有理想的电性能的潜在机制知之甚少。在这项工作中，我们研究了木质素衍生的生物炭的电导率变化的原因，以优化木质素衍生的生物炭的电导率。为此，我们从三种不同的木质素，一个完整的生物质来源（小麦茎），和纤维素在两个热解温度（900摄氏度，1100摄氏度）生产生物炭。这些生物炭的电导率范围（0.002至18.51 S/cm）与文献中报道的相似。从检查化学和物理生物炭性能和电导率之间的关系的结果表明，氧含量的减少和颗粒大小的变化与电导率的增加。重要的是，在用类似方法分离的木质素生产的生物炭之间观察到电导率的高变化，证明了木质素的性质对生物炭电导率的重要性。这些发现表明，如何进一步选择和优化木质素组合物和加工，以针对木质素衍生生物炭的特定应用。(c)2021作者爱思唯尔有限公司出版
Lignin-derived biochar is a promising, sustainable alternative to petroleum-based carbon powders (e.g., carbon black) for polymer composite and energy storage applications. Prior studies of these biochars demonstrate that high electrical conductivity and good capacitive behavior are achievable. However, these studies also show high variability in electrical conductivity between biochars (similar to 10(-2) -10(2) S/cm). The underlying mechanisms that lead to desirable electrical properties in these lignin-derived biochars are poorly understood. In this work, we examine the causes of the variation in conductivity of lignin-derived biochar to optimize the electrical conductivity of lignin-derived biochars. To this end, we produced biochar from three different lignins, a whole biomass source (wheat stem), and cellulose at two pyrolysis temperatures (900 degrees C, 1100 degrees C). These biochars have a similar range of conductivities (0.002 to 18.51 S/cm) to what has been reported in the literature. Results from examining the relationship between chemical and physical biochar properties and electrical conductivity indicate that decreases in oxygen content and changes in particle size are associated with increases in electrical conductivity. Importantly, high variation in electrical conductivity is seen between biochars produced from lignins isolated with similar processes, demonstrating the importance of the lignin's properties on biochar electrical conductivity. These findings indicate how lignin composition and processing may be further selected and optimized to target specific applications of lignin-derived biochars. (c) 2021TheAuthors. Published by Elsevier Ltd.