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<p>Zinc-air batteries (ZABs) are regarded as promising energy storage devices next-generation, but it is limited by their sluggish oxygen reduction/evolution reactions (ORR/OER). Therefore, it is highly necessary to explore inexpensive and more efficient transition metal based electrocatalyst for facilitating OER and ORR. Consequently, in this paper, transition metal phosphating compounds (Co<sub>2</sub>P<sub>2</sub>O<sub>7</sub>/FeP<sub>2</sub>@C) was synthesized by high-temperature treatment CoFe terephthalic acid chelating with phytic acid (PA). The resulting nanostructures of Co<sub>2</sub>P<sub>2</sub>O<sub>7</sub>/FeP<sub>2</sub> coated with P-doped carbon exhibit outstanding electrocatalytic performance, achieving OER overpotential of 405&#xa0;mV at 10&#xa0;mA&#xa0;cm<sup>−2</sup> and an initial ORR potential of 0.83&#xa0;V versus reversible hydrogen electrode. Meanwhile, the ZABs prepared by Co<sub>2</sub>P<sub>2</sub>O<sub>7</sub>/FeP<sub>2</sub>@C exhibited high specific capacity (817.76 mAh g<sup>−1</sup>) and long cycle stability (60&#xa0;h). Here, the well-designed terephthalic acid unified with PA, not only produced phosphide at elevated temperatures, but also enhanced catalyst porosity caused by abundant hydroxyl groups in PA, potentially increased specific surface area. Additionally, PA introduced P-doped carbon matrix, which effectively modulated the carrier's electronic structure, introduced more defect as active sites and combined with porous structure to enhance the electrocatalytic effect. This work introduced an environmentally friendly method to synthesize transition metal phosphide on porous carbon matrix, and it is anticipated to find extensive applications in electrocatalysis.</p> Graphical abstract <p></p>

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Application of Co2P2O7/FeP2@C derived from CoFe terephthalic acid in zinc-air battery

  • 期刊论文

  • 发表日期：

    2025年12月23日

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  • Aohua Liu,
  • Jianhong Chen,
  • Gang Wang,
  • Feng Yu,
  • Banghua Peng

摘要

Zinc-air batteries (ZABs) are regarded as promising energy storage devices next-generation, but it is limited by their sluggish oxygen reduction/evolution reactions (ORR/OER). Therefore, it is highly necessary to explore inexpensive and more efficient transition metal based electrocatalyst for facilitating OER and ORR. Consequently, in this paper, transition metal phosphating compounds (Co2P2O7/FeP2@C) was synthesized by high-temperature treatment CoFe terephthalic acid chelating with phytic acid (PA). The resulting nanostructures of Co2P2O7/FeP2 coated with P-doped carbon exhibit outstanding electrocatalytic performance, achieving OER overpotential of 405 mV at 10 mA cm−2 and an initial ORR potential of 0.83 V versus reversible hydrogen electrode. Meanwhile, the ZABs prepared by Co2P2O7/FeP2@C exhibited high specific capacity (817.76 mAh g−1) and long cycle stability (60 h). Here, the well-designed terephthalic acid unified with PA, not only produced phosphide at elevated temperatures, but also enhanced catalyst porosity caused by abundant hydroxyl groups in PA, potentially increased specific surface area. Additionally, PA introduced P-doped carbon matrix, which effectively modulated the carrier's electronic structure, introduced more defect as active sites and combined with porous structure to enhance the electrocatalytic effect. This work introduced an environmentally friendly method to synthesize transition metal phosphide on porous carbon matrix, and it is anticipated to find extensive applications in electrocatalysis.

Graphical abstract