4.8 Article

Potassium Cobalt Pyrophosphate as a Nonprecious Bifunctional Electrocatalyst for Zinc-Air Batteries

Journal

ACS APPLIED MATERIALS & INTERFACES
Volume 14, Issue 7, Pages 8992-9001

Publisher

AMER CHEMICAL SOC
DOI: 10.1021/acsami.1c21481

Keywords

cobalt pyrophosphate; bifunctional electrocatalyst; ORR; OER; zinc-air batteries

Funding

  1. Technology Mission Division (DST, Government of India) under the aegis of Materials for Energy Storage (MES-2018) program [DST/TMD/MES/2k18/00217]
  2. DST [IF160154]
  3. University Grant Commission (UGC)
  4. International Centre for Diffraction Data (ICDD)
  5. Electrochemical Society (ECS)
  6. Council of Scientific and Industrial Research (CSIR, Govt. of India)
  7. JNCASR
  8. Science and Engineering Research Board (SERB, Govt. of India)

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This study reports a new pyrophosphate material, K2CoP2O7, as a cathode material for secondary zinc-air batteries with efficient oxygen evolution and reduction activities. The nanoscale K2CoP2O7 prepared by autocombustion exhibited superior performance among all phosphate-based electrocatalysts, surpassing the commercial RuO2 in oxygen evolution reaction (OER) activity. First-principles calculations revealed that the bifunctional activity is attributed to the Co active site on the most stable (110) surface. This nanostructured pyrophosphate can serve as an economic bifunctional catalyst for zinc-air batteries.
Economic and sustainable (ecological) energy storage forms a major pillar of the global energy sector. Bifunctional electrocatalysts, based on oxygen electrolysis, play a key role in the development of rechargeable metal-air batteries. Pursuing precious metal-free economic catalysts, here, we report K2CoP2O7 pyrophosphate as a robust cathode for secondary zinc-air batteries with efficient oxygen evolution and oxygen reduction (OER parallel to ORR) activity. Prepared by autocombustion, nanoscale K2CoP2O7 exhibited excellent oxygen reduction and evolution reactions among all phosphate-based electrocatalysts. In particular, the OER activity surpassed that of commercial RuO2 with low overpotential (0.27 V). First-principles calculations revealed that the bifunctional activity is rooted in the Co active site with the CoO5 local coordination in the most stable (110) surface. This nanostructured (tetragonal) pyrophosphate can be harnessed as an economic bifunctional catalyst for zinc-air batteries.

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