Abstract
A transformation of LDPE in highly ordered doped-carbon materials by a simple one-step pyrolysis in presence of transition metal precursors is proposed. The graphitization, metal dispersion and CNFs presence are key factors for the high ORR performance.
Highlights
The unstoppable growth of the energy demand, as well as environmental pollution, has intensely encouraged research on alternative and highly efficient energy conversion and storage systems and must be adequately addressed to maintain the sustainability of our environment
The surface chemistry was studied by X-ray photoelectron spectroscopy (XPS) by using a Kratos Axis Ultra-DLD spectrometer equipped with a hemispherical electron analyzer connected to a DLD and an Al Kα monochromator with a power of 600 W
Kong and Zhang have reported the catalytic pyrolysis of low-density polyethylene (LDPE) at 700 °C where the dark solid obtained was solely composed of carbon nanotubes with a low degree of graphitization.[30]
Summary
The unstoppable growth of the energy demand, as well as environmental pollution, has intensely encouraged research on alternative and highly efficient energy conversion and storage systems and must be adequately addressed to maintain the sustainability of our environment. In 2017, the percentages increased to 8% for recycling, with 16% devoted to energy recovery but, most of the plastic waste (76%) has continued going into landfills.[18] it is still insufficient as a solution, especially taking into account that polymers need hundreds of years to degrade under normal environmental conditions Because of their stability against the weather, microplastics are present in oceans.[19] In addition, it is estimated that in the US alone, around 100 tons of microplastics might enter the oceans annually.[20] that, and recent studies have reported microplastics in the Antarctic marine system.[21] These particles are ingested by a wide range of organisms in the flora and fauna of the marine environment developing toxicity.[19] The present worrying situation encourages research on new methods for plastic recycling able to avoid the shortcomings of the current transformation. In the present work, we demonstrate the high electrocatalytic performance in the oxygen reduction reaction of carbon nanocomposites with a high degree of graphitization obtained by the catalytic pyrolysis of plastic waste under high self-pressure conditions
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