The Cover Feature shows sunlight as a symbol of the energy conversion capabilities of the porphyrin–peptide system and its versatile applications in energy transformation, artificial photosynthesis, and biomedical fields. The illustration offers a systematic graphical overview, highlighting molecular design and its broader significance in the scientific community. More information can be found in the Review by G. Ghosh and co-workers (DOI: <a target="_blank"
 title="Link to external resource"
 href="http://doi.wiley.com/10.1002/cphc.202500150">10.1002/cphc.202500150</a>).

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Cover Feature: Porphyrin–Peptide Conjugates: Functional Self‐Assembled Nanomaterials for Biomedical and Energy Conversion Applications (ChemPhysChem 16/2025)

The Cover Feature shows sunlight as a symbol of the energy conversion capabilities of the porphyrin–peptide system and its versatile applications in energy transformation, artificial photosynthesis, and biomedical fields. The illustration offers a systematic graphical overview, highlighting molec...

This review summarizes the recent advances regarding FeNC catalyst for oxygen reduction reaction (ORR). The fundamental aspects regarding active site structures, reaction mechanisms, as well as catalytic activity tuning, are discussed. Future directions regarding the active site dynamic evolution during ORR, impact of the solvation environment and surface charges, as well as machine learning-assisted catalyst design are drawn.
 
Atomically dispersed FeNC catalysts with high oxygen reduction reaction (ORR) activity have attracted great attention since the last decade. Due to comparable ORR activity and low material cost, they are promising platinum group metal (PGM)-free catalysts that can replace the commercialized Pt/C materials; furthermore, it can facilitate the efficiency of the fuel cell technologies and mitigate dependence on fossil fuels. Great advancements have been made to experimentally optimize the synthesis approach of the FeNC catalysts, enhance the ORR activity, and improve the catalyst stability. Similarly, recent theoretical studies also provide enriched understanding of the active site structures, properties, and reaction mechanisms. In this review, discussions are made upon utilizing combined experimental and computational spectroscopy to reveal the active site structures, employing mechanistic studies to investigate reaction thermodynamics and kinetics, as well as developing scaling relationships to assist the design and development of future PGM-free catalyst materials. Furthermore, recent advances in studying FeNC catalysts utilizing electrified surface models and explicit solvation models are also discussed. Not only can these aspects improve the accuracy of theoretical simulation and predictions but also deepen the understanding of the catalyst properties and reaction mechanisms under the effect of surface charges and solvent molecules.

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Cover Feature: Porphyrin–Peptide Conjugates: Functional Self‐Assembled Nanomaterials for Biomedical and Energy Conversion Applications (ChemPhysChem 16/2025)

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Understanding the Active Site Structures and Achieving Catalytic Activity Tuning of Atomically Dispersed FeN4 Sites for Oxygen Reduction Reaction

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