Electrocatalytic nitrite reduction reaction (NO₂⁻RR) to synthesize ammonia (NH₃) has been constrained by sluggish kinetics of water dissociation and the weak adsorption of nitrite. In this work, we develop an in-situ reconstruction strategy that transforms Ni-doped BiO_2-x (NiBiO_2-x) to Bi/NiBiO_2-x, which exhibits excellent activity and selectivity for NO₂⁻RR to synthesize NH₃. Diverse ex-situ and in-situ characterizations reveal potential-driven structural transformation from NiBiO_2-x to Bi/NiBiO_2-x, which features dual Ni²⁺-Bi⁰ active sites. The Ni²⁺ site is able to reduce the water dissociation barrier from 0.79 to 0.41 eV, while concurrently the Bi⁰ site can strengthen NO₂⁻ adsorption to promote *NO₂H intermediate formation. Consequently, the in-situ constructed Bi/NiBiO_2-x catalyst with Ni²⁺-Bi⁰ catalytic pairs enable an excellent NO₂⁻RR performance, achieving a NH₃ Faradaic efficiency (FE_NH3) of 94.5% at −0.6 V vs. RHE. The present study opens the new direction to in-situ construct high-performance electroreduction catalysts for small molecule synthesis.

A new scientific review reveals how click chemistry—a highly efficient chemical approach—is transforming oncology by merging accurate diagnosis with precision therapy into a single system. 

A low-Tg chalcogenide-glass adhesive (As-S(Se)-I, Tg = 8.85 ℃, n≈2.1) is presented that bonds at 120 ℃, wets interfaces, fills gaps, and cools into a robust glass bonding layer. It lifts transmission to a maximum of 91%, reduces reflection to 4.8% (from 58.5%), increases the laser-damage threshold by >59%, and enables 11.7 W delivery from endcap fiber, providing a universal, thermoplastic yet stable route to compact, high-power, thermally reliable mid-IR photonic systems.

Linzhi Yu et al. have developed compact metasurface operators for all-optical image processing, enabled by double-phase encoding and polarization multiplexing. This ultrathin nanophotonic platform performs real-time light field transformations, including edge detection, object recognition, and volumetric holography. The work introduces new possibilities for ultra-compact, energy-efficient analog computing systems, with potential applications in imaging, sensing, and holographic displays.

A new, consolidated checklist of diatoms—a major group of photosynthetic microalgae—has been compiled for the Salish Sea, northeast Pacific, by a team of Canadian scientists. Integrating historical records with new reports, this first comprehensive baseline establishes a foundation for assessing diatom diversity in the region. As primary producers at the base of marine food webs, diatoms are key indicators of environmental change, providing critical insight into the health and resilience of the Salish Sea bioregion. The checklist is now published in the open-access Biodiversity Data Journal.