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Periodic polarity reversal (PPR) presents an efficient strategy to improve nitrate (NO-N) reduction in electrochemically active biofilm (EAB), but the involved extracellular electron transfer (EET) processes are still unclear. Here, the contributions of unidirectional/bidirectional EET and electron storage for NO-N reduction in EABs were quantified with different polarity reversal operations. The NO-N reduction efficiencies reach 6.

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Single-Atom Catalysts (SAC) have emerged as a promising class of materials for various catalytic applications, including the electrochemical nitrate reduction reaction (eNORR) and consequently ammonia production. While the efficiency and selectivity of these materials have been extensively highlighted for the eNORR, the in situ evolution to their structure and composition during electrocatalysis is largely unexplored and lacks catalyst design principles. To solve this, we investigated a series of high utilization metal-nitrogen-carbon (MNC) SACs (M = Cr, Fe, Co, Ni, and Cu) for eNORR.

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Robust Ferroelectricity in Silicon Dioxide upon Intercalation of Ammonia.

J Phys Chem Lett

September 2025

Laboratory of Solid State Microstructures, Nanjing University, Nanjing, Jiangsu 210093, China.

The nanoelectronic applications of current ferroelectrics have been greatly impeded by their incompatibility with silicon. In this paper, we propose a way to induce ferroelectricity in silicon dioxide (SiO), which is still the most widely used dielectric material in silicon-based chips. We show first-principles evidence that the intercalation of NH molecules into crystalline SiO is exothermic (Δ = -0.

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Iodine Dopants Facilitate Tandem Catalysis via Transformation Adsorption Behavior for Efficient Electrochemical Nitrate Reduction Reaction.

ACS Nano

September 2025

School of Chemical Engineering and Technology, National-Local Joint Engineering Laboratory for Energy Conservation in Chemical Process Integration and Resources Utilization, Hebei University of Technology, Tianjin 300130, China.

Electrochemical nitrate reduction reaction (NORR) has great potential for simultaneously achieving nitrate-rich wastewater treatment and ammonia (NH) synthesis. Given that the NORR process encompasses distinct steps of deoxygenation and hydrogenation, the active sites of most catalysts frequently demonstrate similar adsorption behavior. In this work, the second-shell iodine-doped modified cobalt single atoms (I-CoN) and cobalt atomic clusters (Co AC) anchored on nitrogen-doped carbon (Co SAAC/INC) are synthesized through a mild etching synchronization doping strategy.

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The comprehension of the digestive strategy of red-footed tortoises () is necessary for effective dietary practices, which prevent metabolic disorders often seen in captivity. The present study evaluated the effects of three extruded diets (high in fibre [Control], high in starch [Starch], and high in fat [Fat]) on the tortoises' preference, nutrient digestibility, faeces quality, fermentation products, and gastrointestinal transit time (GTT). Eighteen adult red-footed tortoises (9 males and 9 females) were used to compare diet palatability.

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