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Hierarchically Porous Carbon Plates Derived from Wood as Bifunctional ORR/OER Electrodes
Advanced Materials ( IF 27.4 ) Pub Date : 2019-03-07 , DOI: 10.1002/adma.201900341 Xinwen Peng 1 , Lei Zhang 1 , Zhongxin Chen 2 , Linxin Zhong 1 , Dengke Zhao 3 , Xiao Chi 2 , Xiaoxu Zhao 2 , Ligui Li 3 , Xihong Lu 4 , Kai Leng 2 , Cuibo Liu 2 , Wei Liu 2 , Wei Tang 2 , Kian Ping Loh 2
Advanced Materials ( IF 27.4 ) Pub Date : 2019-03-07 , DOI: 10.1002/adma.201900341 Xinwen Peng 1 , Lei Zhang 1 , Zhongxin Chen 2 , Linxin Zhong 1 , Dengke Zhao 3 , Xiao Chi 2 , Xiaoxu Zhao 2 , Ligui Li 3 , Xihong Lu 4 , Kai Leng 2 , Cuibo Liu 2 , Wei Liu 2 , Wei Tang 2 , Kian Ping Loh 2
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Porous carbon electrodes have emerged as important cathode materials for metal–air battery systems. However, most approaches for fabricating porous carbon electrodes from biomass are highly energy inefficient as they require the breaking down of the biomass and its subsequent reconstitution into powder‐like carbon. Here, enzymes are explored to effectively hydrolyze the partial cellulose in bulk raw wood to form a large number of nanopores, which helps to maximally expose the inner parts of the raw wood to sufficiently dope nitrogen onto the carbon skeletons during the subsequent pyrolysis process. The resulting carbons exhibit excellent catalytic activity with respect to the oxygen reduction and oxygen evolution reactions. As‐fabricated cellulose‐digested, carbonized wood plates are mechanically strong, have high conductivity, and contain a crosslinked network and natural ion‐transport channels and can be employed directly as metal‐free electrodes without carbon paper, polymer binders, or carbon black. When used as metal‐free cathodes in zinc–air batteries, they result in a specific capacity of 801 mA h g−1 and an energy density of 955 W h kg−1 with the long‐term stability of the batteries being as high as 110 h. This work paves the way for the ready conversion of abundant biomass into high‐value engineering products for energy‐related applications.
中文翻译：
木材衍生的多层多孔碳板，作为双功能ORR / OER电极
多孔碳电极已经成为金属-空气电池系统的重要阴极材料。但是，大多数由生物质制造多孔碳电极的方法都效率极低，因为它们需要分解生物质并随后将其重组为粉末状碳。在这里，人们研究了酶以有效地水解散装原木中的部分纤维素，从而形成大量的纳米孔，这有助于最大程度地暴露原木的内部，从而在随后的热解过程中将氮充分掺杂到碳骨架上。所得的碳在氧还原和氧释放反应方面显示出优异的催化活性。人造纤维素消化的碳化木板机械强度高，导电率高，并包含交联网络和天然离子传输通道，可直接用作无金属电极，而无需碳纸，聚合物粘合剂或炭黑。当用作锌-空气电池中的无金属阴极时，它们的比容量为801 mA hg-1，能量密度为955 W h kg -1，电池的长期稳定性高达110 h。这项工作为将丰富的生物质立即转化为能源相关应用的高价值工程产品铺平了道路。
更新日期：2019-03-07
中文翻译：
木材衍生的多层多孔碳板，作为双功能ORR / OER电极
多孔碳电极已经成为金属-空气电池系统的重要阴极材料。但是，大多数由生物质制造多孔碳电极的方法都效率极低，因为它们需要分解生物质并随后将其重组为粉末状碳。在这里，人们研究了酶以有效地水解散装原木中的部分纤维素，从而形成大量的纳米孔，这有助于最大程度地暴露原木的内部，从而在随后的热解过程中将氮充分掺杂到碳骨架上。所得的碳在氧还原和氧释放反应方面显示出优异的催化活性。人造纤维素消化的碳化木板机械强度高，导电率高，并包含交联网络和天然离子传输通道，可直接用作无金属电极，而无需碳纸，聚合物粘合剂或炭黑。当用作锌-空气电池中的无金属阴极时，它们的比容量为801 mA hg-1，能量密度为955 W h kg -1，电池的长期稳定性高达110 h。这项工作为将丰富的生物质立即转化为能源相关应用的高价值工程产品铺平了道路。
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