Inexpensive electrocatalysts with excellent catalytic activity as the counter electrodes (CEs) are crucial for the commercialization of solar cells. Herein, we report a unique rhombic dodecahedron framework of doped porous carbon loaded with 0.66 wt.% Fe as a tri-element catalyst and its application as a CE in solar cells. Experimental and theoretical results reveal that the excellent catalytic activity is mainly attributed to the high ionic interaction between metal and nonmetal. A mesoporous structure can facilitate the penetration of the electrolyte and the involvement of internal active sites in the redox reaction. Consequently, solar cells constructed with tri-element metal-nonmetal nanohybrids provide an impressive power conversion efficiency of 8.06%, which is superior to that of Pt-based devices (7.93%). This is the highest efficiency reported for single Fe atom catalyst-based photovoltaics. The present work provides a new avenue for the exploration of earth-abundant and efficient CE materials in photovoltaics.

作为对电极（CE），具有出色催化活性的廉价电催化剂对于太阳能电池的商业化至关重要。在本文中，我们报道了一种独特的菱形十二面体骨架，其中掺杂了0​​.66 wt％的铁作为三元素催化剂，掺杂了多孔碳，并将其用作CE在太阳能电池中的应用。实验和理论结果表明，优异的催化活性主要归因于金属与非金属之间的高离子相互作用。中孔结构可以促进电解质的渗透和内部活性位点在氧化还原反应中的参与。因此，由三元素金属-非金属纳米杂化物构成的太阳能电池可提供令人印象深刻的8.06％的功率转换效率，优于基于Pt的器件（7.93％）。这是单铁原子催化剂基光伏产品报道的最高效率。目前的工作为探索光伏中富含地球和高效CE的材料提供了一条新途径。