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首页> 外文期刊>Catalysis science & technology >Recycling and valorization of LDPE: direct transformation into highly ordered doped-carbon materials and their application as electro-catalysts for the oxygen reduction reaction
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Recycling and valorization of LDPE: direct transformation into highly ordered doped-carbon materials and their application as electro-catalysts for the oxygen reduction reaction

机译：LDPE的回收和价值：直接转化为高度有序的掺杂碳材料及其作为氧还原反应的电催化剂的应用

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摘要

The energy demand and the environmental situation make the development of advanced catalysts for energy applications necessary. Considering the large volumes of plastic waste, the transformation of organic polymers into advanced carbon functional materials that are able to accomplish the oxygen reduction reaction via the desired 4-electron pathway is proposed as an integrated environmental remediation, in which plastic pollutants are converted into catalysts for fuel cells. Carbon-based electro-catalysts were obtained by pyrolyzing low-density polyethylene at low temperature by an easy one-step method that involves the generation of autogenous pressure which is the responsible for the spherical shape as well as the high degree of graphitization. The addition of transition metals (Fe, Co or Ni) modifies the carbonization process and CNFs emerge. The metal-free material leads to a purely 2e− pathway; however, the presence of metals improves all electrochemical parameters and the desired 4e−pathway is achieved. The graphitization degree, the metal dispersion and the presence of CNFs are the key factors for the ORR performance.
机译：能源需求和环境状况使得为了开发高级催化剂，以实现所需的能源应用。考虑到大量的塑料废物，将有机聚合物转化为高级碳功能材料，能够通过所需的4电子途径来完成减少氧气的反应，以作为集成的环境修复，其中将塑料污染物转化为催化剂用于燃料电池。通过易于在低温下的低密度聚乙烯通过一种简单的一步方法来获得基于碳的电催化剂，该方法涉及自体压力的产生，该方法是负责球形形状以及高度石墨化的负责。过渡金属（Fe，Co或Ni）的添加会改变碳化过程，CNFS出现。无金属材料导致纯2e-途径;但是，金属的存在改善了所有电化学参数，并实现了所需的4E路径。石墨化度，金属色散和CNF的存在是ORR性能的关键因素。

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