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Converting N2 into NH3 under mild conditions is a great challenge because of the highly stable N≡N bond and the difficult chemisorption of N2 at the active site. Herein, we report that MoO2/BiOCl composites realized excellent photocatalytic nitrogen fixation efficiency when water was used proton source. The strong interaction between BiOCl nanoplates and MoO2 nanosheets regulated the electronic structure of the interface and provided active sites for the catalytic reaction. The Mo−O−Bi bonds formed at the interface of MoO2 and BiOCl worked as the bridge of electrons, facilitating the separation and migration of photo‐generated charge carriers. In addition, the interface of MoO2/BiOCl composite also promoted the adsorption and activation of N2, substantially enhanced N2 reduction. As a result, ammonia production rate of 35 μmol g−1 h−1 was achieved, which is 8‐fold higher than that of pristine BiOCl and 6‐fold higher than that of MoO2. This work presents a feasible route to design the nanocomposites with better performance for photocatalytic nitrogen fixation. [ABSTRACT FROM AUTHOR]

Anode cell reversal typically leads to severe carbon corrosion and catalyst layer collapse, which significantly compromises the durability of proton exchange membrane fuel cells. Herein, three types of commercial carbon supports with various structures are facilely coated by polyaniline (PANI) and subsequently fabricated into reversal-tolerant anodes (RTAs). Consequently, the optimized PANI-coated catalyst RTAs demonstrate enhanced polarization performance and improved reversal tolerance compared to their uncoated counterparts, thus confirming the universality of this coating strategy. Essentially, the surface engineering introduced by PANI coating incorporates abundant N-groups and enhances coulombic interactions with ionomer side chains, which in turn reduces lower carbon exposure, promotes more uniform Pt deposition, and ensures better ionomer distribution. Accordingly, the membrane-electrode-assembly containing the Pt/PANI/XC-72R-1+IrO 2 RTA presents a 100 mV (at 2500 mA cm -2 ) polarization performance improvement and 26-fold reduction in the degradation rate compared to the uncoated counterpart. This work provides a universal strategy for developing durable anodes and lays the groundwork for the practical fabrication of high-performance, low-degradation RTA., (© 2024 The Author(s). Advanced Science published by Wiley‐VCH GmbH.)