Ni–Zn Dual-Atom Sites Enable Synergistic Parallel Pathways for Efficient Photosynthesis of H 2 O 2 with Long-Term Stability

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The photocatalytic coupling of oxygen reduction (ORR) and water oxidation (WOR) pathways presents a sustainable strategy to supplant the energy-intensive anthraquinone process for H 2 O 2 production. However, persistent challenges in radical-mediated catalyst degradation ( • O 2 – / • OOH/ • OH) and suboptimal charge dynamics continue to plague conventional photocatalytic systems. Herein, we anchored dual-atom Ni–Zn sites onto polymeric carbon nitride (PCN) to prepare an efficient photocatalyst ( Ni 1 Zn 1 -PCN ) for photocatalytic H 2 O 2 production. Interestingly, using oxygen and water as feedstocks, Ni 1 Zn 1 -PCN achieves a record yield of 1205.4 μmol g –1 h –1 with unprecedented operational stability (>376 h, TON = 2659.6), outperforming best reported catalysts. Mechanism studies revealed that the dual-atom Ni–Zn site could induce charge transfer excitation of the support PCN to suppress electron–hole recombination. In addition, the electronic interaction/modulation in the dual-active sites reduces the activation energy barriers of the WOR and the ORR, thereby achieving a high overall photocatalytic efficiency. This work marks a step forward in the development of efficient and durable photocatalytic H 2 O 2 synthesis, offering significant potential for industrial-scale renewable energy applications.

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