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Reduced Graphene Oxide and Pd Nanocomposite as a Catalyst for Oxygen Reduction Reaction in Rechargeable Li‐Oxygen Battery
Author(s) -
Kumar Surender,
Kumar Satendra,
Kumar Divyaratan,
Sathish N.,
Singh Archana,
Goswami Manoj
Publication year - 2019
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.201803819
Subject(s) - graphene , overpotential , oxide , catalysis , battery (electricity) , aqueous solution , electrolyte , materials science , nanocomposite , nanoparticle , inorganic chemistry , oxygen , chemical engineering , chemistry , electrode , electrochemistry , nanotechnology , organic chemistry , metallurgy , power (physics) , physics , quantum mechanics , engineering
Pd +2 ions are reduced on two‐dimensional reduced graphene oxide nanosheets in aqueous phase by NaBH 4 as reducing agent. Pd nanoparticles are uniformly grown on graphene sheets in 5–15 nm range, verified by TEM investigation. Oxygen reduction reaction (ORR) is carried in nonaqueous medium by using rotating disk electrode technique. For comparison, ORR activity of pure RGO is also studied; ORR follows one e− pathway (O 2 + e−=O2−) in non‐aqueous electrolyte. Pd‐RGO has ORR activity five times more as compared to pure RGO in 0.10 M TBAP‐DMSO solution. Pd‐RGO catalyst is used to assemble the non‐aqueous Li‐O 2 batteries and charge‐discharge cycling is carried out. At 0.20 mA cm−2 the discharge capacity of 8192 mAh g−1 is obtained. Overpotential for ORR (or discharge) step is 260 mV. This is first report on reaction chemistry in Li‐O 2 battery using Pd nanoparticles. Li 2 O 2 and Li 2 O are confirmed as discharged products by ex‐situ XRD studies.