The development of low cost electrocatalysts with excellent I^-/I₃^- redox reaction efficiency is critically important for practical applications of dye-sensitized solar cells (DSSCs). Nevertheless, it is difficult to simultaneously improve the activity and stability of catalysts. Herein, heterogeneous FeNi₃/NiFe₂O₄ nanoparticles are successfully embedded in modified graphene (mGr) matrix with network structure. As-prepared FeNi₃/NiFe₂O₄@mGr shows excellent electrocatalytic activities and high stability. The DSSCs with FeNi₃/NiFe₂O₄@mGr as counter electrodes demonstrate a high power conversion efficiency of 12.14%, which is superior to that of platinum (Pt, 8.31%). Also, the FeNi₃/NiFe₂O₄@mGr device remains 90% efficiency up to 42 days under ambient conditions without encapsulation. Therefore, the FeNi₃/NiFe₂O₄@mGr composite can be further developed as an environmentally friendly, inexpensive, and efficient counter electrode material for DSSCs.

低成本电催化剂具有优良的余发展^- / I ₃ ^-氧化还原反应效率为染料敏化太阳能电池（DSSC）的实际应用中是至关重要的。然而，难以同时提高催化剂的活性和稳定性。本文成功地将异质FeNi ₃ / NiFe ₂ O ₄纳米颗粒嵌入具有网络结构的改性石墨烯（mGr）基质中。制备的FeNi ₃ / NiFe ₂ O ₄ @mGr显示出优异的电催化活性和高稳定性。含FeNi ₃ / NiFe ₂ O ₄的DSSC作为对电极的@mGr表现出12.14％的高功率转换效率，优于铂（Pt，8.31％）。同样，FeNi ₃ / NiFe ₂ O ₄ @mGr器件在环境条件下长达42天仍能保持90％的效率，而无需封装。因此，FeNi ₃ / NiFe ₂ O ₄ @mGr复合材料可以进一步发展为一种环保，廉价且有效的DSSC对电极材料。