An efficient and durable trifunctional electrocatalyst for zinc–air batteries driven overall water splitting

Natarajan Logeshwaran, Shanmugam Ramakrishnan, Selvaraj Selva Chandrasekaran, Mohanraj Vinothkannan, Ae Rhan Kim, Sivaprakash Sengodan, Dhinesh Babu Velusamy, Purushothaman Varadhan, Jr Hau He, Dong Jin Yoo

Research output: Contribution to journalArticlepeer-review

11 Scopus citations

Abstract

Constructing more active and durable trifunctional electrocatalysts is key for boosting overall water splitting and metal–air battery efficiency. Herein, we developed a trifunctional electrocatalyst of ultrafine Pt nanoparticles anchored on CoS2-N-doped reduced graphene oxide (Pt@CoS2-NrGO). Owing to its more Pt active sites with rapid ion/electron transport ability, the Pt@CoS2-NrGO shows excellent trifunctional activities towards HER (ƞ10 = 39 mV), OER (ƞ10 = 235 mV) ORR (E1/2 = 0.85 V vs. RHE) and water splitting device of Pt@CoS2-NrGO||Pt@CoS2-NrGO achieved cell voltage of 1.48 V at 10 mA cm−2, which is better than Pt-C||RuO2. Finally, we employed Pt@CoS2-NrGO as air cathode for zinc–air battery to display a power density of 114 mW cm-2 and durability of 55 h, outperforming than Pt-C + RuO2 based zinc–air batteries. For practical aspects, Pt@CoS2-NrGO based zinc–air batteries were connected to overall water splitting device to produce H2 and O2 gases for hydrogen fuel cell.
Original languageEnglish (US)
Pages (from-to)120405
JournalApplied Catalysis B: Environmental
Volume297
DOIs
StatePublished - Jun 1 2021

ASJC Scopus subject areas

  • Environmental Science(all)
  • Catalysis
  • Process Chemistry and Technology

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