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The application of three-dimensional (3D) covalent organic frameworks (COFs) in renewable energy fields is greatly limited due to their nonconjugated skeletons. Here, we design and successfully synthesize a thiophene-enriched fully conjugated 3D COF (BUCT-COF-11) through an all-thiophene-linked saddle-shaped building block (COThTh-CHO). The BUCT-COF-11 exhibits excellent semiconducting property with intrinsic metal-free oxygen reduction reaction (ORR) activity. Using the COF as cathode catalyst, the assembled anion-exchange membrane fuel cells (AEMFCs) exhibited a high peak power density up to 493 mW cm À 2 . DFT calculations reveal that thiophene introduction in the COF not only improves the conductivity but also optimizes the electronic structure of the sample, which therefore boosts the ORR performance. This is the first report on the application of COFs as metal-free catalysts in fuel cells, demonstrating the great potential of fully conjugated 3D COFs as promising semiconductors in energy fields.

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His research focus is hydrogen energy including green hydrogen generation and fuel cell technology. Contents 1. Introduction 711 2. The Synthesis Methods, Formation Mechanism and Structure of Active Sites in M-N-C Catalysts 712 3. Stability Status of M-N-C Catalysts 714 4. Degradation Mechanisms 715 4.1. Demetallation 715 4.2. Carbon corrosion 716 4.3. Attack of H 2 O 2 717 4.4. N protonation 717 4.5 Water flooding 719 5. Summary and Perspective 720 www.cjc.wiley-vch.de

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