Journal
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
Volume 7, Issue 1, Pages 1137-1145Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acssuschemeng.8b04797
Keywords
Biomass-derived electrocatalyst; Multilayer-graphene-encapsulated cobalt nanoparticles; Oxygen reduction reaction; Triiodide reduction reaction
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Funding
- National Natural Science Foundation of China [51402036, 51773025, 21677029]
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The assembly between carbon materials and transition metals has been proved to be a feasible strategy to synthesize electrocatalysts with good activity and stability, especially those with carbon-encapsulated core shell structures that were prepared through multiple processes. Via direct pyrolysis of kelp, we demonstrate in our work the successful synthesis a composite consisting of electrochemically active and graphene-encapsulated cobalt nanoparticles embedded in N, P, S codoped carbon three-dimensional matrix. This biomass-derived electrocatalyst is low-cost and more facile in preparation, and its typical structural features like hierarchical pore structure, high specific area and heteroatom doping enable it to serve as not only a promising cathode material for oxygen reduction reaction (ORR) in fuel cells but also a counter electrode material for triiodide reduction reaction (TIRR) in dye-sensitized solar cells. More importantly, the unique structure of multilayer-graphene-encapsulated cobalt nanoparticles is beneficial to increase contact area, inhibiting the aggregation and dissolution of metal nanoparticles, thus improving the electrocatalytic performance and stability for ORR and TIRR.
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