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An Efficient Anti-poisoning Catalyst against SO

Tayyaba Najam1, Syed Shoaib Ahmad Shah1, Wei Ding1

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A new metal-free electrocatalyst effectively resists poisoning from common pollutants like SOx and NOx during the oxygen reduction reaction (ORR). This durable catalyst enhances fuel cell performance even in harsh conditions.

Keywords:
P-, N-doped carbonPEMFCsanti-poisoningmetal-free electrocatalystsoxygen reduction reaction

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Catalysis

Background:

  • Electrocatalysts for oxygen reduction reaction (ORR) are susceptible to poisoning by atmospheric pollutants such as sulfur oxides (SOx) and nitrogen oxides (NOx).
  • This poisoning significantly reduces the activity and durability of hydrogen-oxygen (H2-O2) fuel cells, limiting their practical application.

Purpose of the Study:

  • To develop an efficient, metal-free electrocatalyst with enhanced anti-poisoning capabilities for the oxygen reduction reaction (ORR).
  • To investigate the effect of phosphorus doping on the ORR pathway and performance under poisoning conditions.

Main Methods:

  • Synthesized a metal-free electrocatalyst via pyrolysis of a poly(diallyl dimethylammonium chloride)-phytic acid super-molecular aggregate (PDAP-PPSA).
  • Co-doped the resulting carbon material with phosphorus and/or nitrogen.
  • Evaluated the electrocatalyst's activity and durability for ORR in acidic media, including exposure to SOx, NOx, and phosphorus oxides (POx).

Main Results:

  • The pyrolyzed co-doped carbon (P-doped) exhibited excellent activity and durability for ORR, even under poisoning conditions.
  • The P-doped catalyst demonstrated a preferential four-electron pathway, producing less than 4% H2O2.
  • In contrast, N-doped carbon derived from PDAP showed a less efficient pathway with over 20% H2O2 production.

Conclusions:

  • The developed metal-free, P-doped carbon electrocatalyst offers a promising solution for anti-poisoning in ORR catalysis.
  • This strategy significantly enhances the stability and efficiency of H2-O2 fuel cells in the presence of common pollutants.
  • Phosphorus doping is crucial for directing the ORR towards a more efficient four-electron pathway, outperforming nitrogen doping in this context.