Zhichun Si

Solar-driven overall water splitting offers a sustainable route for producing hydrogen and hydrogen peroxide, yet achieving high H₂O₂ selectivity remains challenging due to competing proton-coupled electron transfer pathways. Here we construct an S-scheme heterojunction composed of carbon quantum dots (CQDs) and K₃PW₁₂O₄₀, where the built-in electric field at the interface enhances charge separation and promotes proton transfer, creating a favorable microenvironment for selective H₂O₂ generation. This catalyst achieves H₂ and H₂O₂ production rates of 603 and 586 μmol/g·h simultaneously under visible light irradiation. The tailored electronic structure lowers energy barriers for key intermediates, facilitating selective H₂O₂ production. These findings demonstrate that interfacial proton regulation combined with broad light absorption and efficient charge separation can guide the design of multifunctional photocatalysts for scalable solar-driven H₂O₂ synthesis.

Charge transfer optimization through the gradient design of solid cathodes promotes ionic/electronic transport, enabling homogeneous Li distribution and ultra-stable durability.

The high-valence Fe ions are stabilized on a CeO₂ support and achieved a record low overpotential of 219 mV to reach the current density of 50 mA cm⁻².

Metal halide perovskites (MHPs) have emerged as attractive building blocks for advanced photoluminescence display applications. But the practical deployment of MHP displays is hindered by the relatively low air stability, which can cause difficulty in high-precision film patterning under ambient conditions while achieving high photoluminescence quantum yields (PLQYs). Here we incorporate a polymer additive of poly(2-ethyl-2-oxazoline) (PEtOx) in the solution processing of quasi-2D phenylbutylamine bromide/cesium lead halide (PBABr/CsPbBr_0.6I_2.4) perovskite films, which not only results in a high PLQY of 91%, but more importantly improves the ambient stability via Lewis base–acid interaction of oxygen functional groups of the polymer and Pb of the perovskite. Using time-resolved optical spectroscopy and femtosecond transient absorption spectroscopy, we find that in the PEtOx-stabilized quasi-2D perovskite film, the trap-assisted nonradiative recombination rate is reduced while the radiative recombination is significantly promoted, underpinning the PLQY improvements. Via mask-less laser direct-write patterning onto this air-stable high-PLQY perovskite film, we have achieved complex-patterned displays on both rigid and flexible substrates, with anti-counterfeiting encryption code as a proof-of-concept demonstration. This work opens new opportunities for engineering perovskites to multifunctional display applications.