Red Bean Pod Derived Heterostructure Carbon Decorated with Hollow Mixed Transition Metals as a Bifunctional Catalyst in Zn-Air Batteries. Mahbub, M. A. A., Adios, C. G., Xu, M., Prakoso, B., LeBeau, J. M, & Sumboja, A. Chemistry - An Asian Journal, 16(17):2559–2567, John Wiley and Sons Ltd, September, 2021.
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Design and synthesis of low-cost and efficient bifunctional catalysts for oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) in Zn-air batteries are essential and challenging. We report a facile method to synthesize heterostructure carbon consisting of graphitic and amorphous carbon derived from the agricultural waste of red bean pods. The heterostructure carbon possesses a large surface area of 625.5 m2 g−1, showing ORR onset potential of 0.89 V vs. RHE and OER overpotential of 470 mV at 5 mA cm−2. Introducing hollow FeCo nanoparticles and nitrogen dopant improves the bifunctional catalytic activity of the carbon, delivering ORR onset potential of 0.93 V vs. RHE and OER overpotential of 360 mV. Electron energy-loss spectroscopy (EELS) O K-edge map suggests the presence of localized oxygen on the FeCo nanoparticles, suggesting the oxidation of the nanoparticles. Zn-air battery with these carbon-based catalysts exhibits a peak power density as high as 116.2 mW cm−2 and stable cycling performance over 210 discharge/charge cycles. This work contributes to the advancement of bifunctional oxygen electrocatalysts while converting agricultural waste into value-added material.
@ARTICLE{Mahbub2021-ph,
  title     = "Red Bean Pod Derived Heterostructure Carbon Decorated with
               Hollow Mixed Transition Metals as a Bifunctional Catalyst in
               {Zn-Air} Batteries",
  author    = "Mahbub, Muhammad Adib Abdillah and Adios, Celfi Gustine and Xu,
               Michael and Prakoso, Bagas and LeBeau, James M and Sumboja,
               Afriyanti",
  abstract  = "Design and synthesis of low-cost and efficient bifunctional
               catalysts for oxygen reduction reaction (ORR) and oxygen
               evolution reaction (OER) in Zn-air batteries are essential and
               challenging. We report a facile method to synthesize
               heterostructure carbon consisting of graphitic and amorphous
               carbon derived from the agricultural waste of red bean pods. The
               heterostructure carbon possesses a large surface area of 625.5
               m2 g−1, showing ORR onset potential of 0.89 V vs. RHE and OER
               overpotential of 470 mV at 5 mA cm−2. Introducing hollow FeCo
               nanoparticles and nitrogen dopant improves the bifunctional
               catalytic activity of the carbon, delivering ORR onset potential
               of 0.93 V vs. RHE and OER overpotential of 360 mV. Electron
               energy-loss spectroscopy (EELS) O K-edge map suggests the
               presence of localized oxygen on the FeCo nanoparticles,
               suggesting the oxidation of the nanoparticles. Zn-air battery
               with these carbon-based catalysts exhibits a peak power density
               as high as 116.2 mW cm−2 and stable cycling performance over 210
               discharge/charge cycles. This work contributes to the
               advancement of bifunctional oxygen electrocatalysts while
               converting agricultural waste into value-added material.",
  journal   = "Chemistry - An Asian Journal",
  publisher = "John Wiley and Sons Ltd",
  volume    =  16,
  number    =  17,
  pages     = "2559--2567",
  month     =  sep,
  year      =  2021,
  keywords  = "Biomass-derived carbon; FeCo; electrocatalysis; metal-air
               batteries; non-precious metal catalyst;LeBeau Group",
  issn      = "1861-471X",
  pmid      = "34382330",
  doi       = "10.1002/ASIA.202100702"
}

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