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1. O ₂ reduction via proton-coupled electron transfer by a V( iii ) aquo on a polyoxovanadate-alkoxide cluster

   https://doi.org/10.1039/d4cc01331j  

   Cooney, Shannon E.; Schreiber, Eric; Ferrigno, Baela M.; Matson, Ellen M. (January 2024, Chemical Communications)

   We report the reduction of O₂to H₂O₂viaconcerted proton–electron transfer from the terminal V(iii)–OH₂moiety of a reduced polyoxovanadate-alkoxide cluster. 

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2. Light-induced O ₂ -dependent aliphatic carbon–carbon (C–C) bond cleavage in bipyridine-ligated Co( ii ) chlorodiketonate complexes

   https://doi.org/10.1039/D2DT03727K  

   Anderson, Stephen N.; Elsberg, Josiah G.; Berreau, Lisa M. (March 2023, Dalton Transactions)

   Illumination of aerobic acetonitrile solutions of bipyridine-ligated Co(ii) chlorodiketonate complexes results in O₂-dependent aliphatic C–C bond cleavage with high¹⁸O incorporation. 

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3. Molecularly engineering polymeric membranes for H₂ / CO₂ separation at 100–300 °C

   https://doi.org/10.1002/pol.20200220  

   Hu, Leiqing; Pal, Sankhajit; Nguyen, Hien; Bui, Vinh; Lin, Haiqing (July 2020, Journal of Polymer Science)

   Abstract Over the last two decades, polymers with superior H₂/CO₂separation properties at 100–300 °C have gathered significant interest for H₂purification and CO₂capture. This timely review presents various strategies adopted to molecularly engineer polymers for this application. We first elucidate the Robeson's upper bound at elevated temperatures for H₂/CO₂separation and the advantages of high‐temperature operation (such as improved solubility selectivity and absence of CO₂plasticization), compared with conventional membrane gas separations at ~35 °C. Second, we describe commercially relevant membranes for the separation and highlight materials with free volumes tuned to discriminate H₂and CO₂, including functional polymers (such as polybenzimidazole) and engineered polymers by cross‐linking, blending, thermal treatment, thermal rearrangement, and carbonization. Third, we succinctly discuss mixed matrix materials containing size‐sieving or H₂‐sorptive nanofillers with attractive H₂/CO₂separation properties. 

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4. Lotic‐SIPCO2 : Adaptation of an open‐source CO₂ sensor system and examination of associated emission uncertainties across a range of stream sizes and land uses

   https://doi.org/10.1002/lom3.10600  

   Robison, Andrew L.; Koenig, Lauren E.; Potter, Jody D.; Snyder, Lisle E.; Hunt, Christopher W.; McDowell, William H.; Wollheim, Wilfred M. (February 2024, Limnology and Oceanography: Methods)

   Abstract River networks play a crucial role in the global carbon cycle, as relevant sources of carbon dioxide (CO₂) to the atmosphere. Advancements in high‐frequency monitoring in aquatic environments have enabled measurement of dissolved CO₂concentration at temporal resolutions essential for studying carbon variability and evasion from these dynamic ecosystems. Here, we describe the adaptation, deployment, and validation of an open‐source and relatively low‐cost in situpCO₂sensor system for lotic ecosystems, the lotic‐SIPCO2. We tested the lotic‐SIPCO2 in 10 streams that spanned a range of land cover and basin size. Key system adaptations for lotic environments included prevention of biofouling, configuration for variable stage height, and reduction of headspace equilibration time. We then examined which input parameters contribute the most to uncertainty in estimating CO₂emission rates and found scaling factors related to the gas exchange velocity were the most influential when CO₂concentration was significantly above saturation. Near saturation, sensor measurement ofpCO₂contributed most to uncertainty in estimating CO₂emissions. We also found high‐frequency measurements ofpCO₂were not necessary to accurately estimate median emission rates given the CO₂regimes of our streams, but daily to weekly sampling was sufficient. High‐frequency measurements ofpCO₂remain valuable for exploring in‐stream metabolic variability, source partitioning, and storm event dynamics. Our adaptations to the SIPCO2 offer a relatively affordable and robust means of monitoring dissolved CO₂in lotic ecosystems. Our findings demonstrate priorities and related considerations in the design of monitoring projects of dissolved CO₂and CO₂evasion dynamics more broadly. 

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5. Elevated CO₂ and N Gradually Weaken the Influence of Diversity on Ecosystem Stability

   https://doi.org/10.1111/ele.70170  

   Mohanbabu, Neha; Isbell, Forest; Hobbie, Sarah E; Reich, Peter B (August 2025, Ecology Letters)

   ABSTRACT Biodiversity promotes ecosystem productivity and stability, positive impacts that often strengthen over time. But ongoing global changes such as rising atmospheric carbon dioxide (CO₂) levels and anthropogenic nitrogen (N) deposition may modulate the impact of biodiversity on ecosystem productivity and stability over time. Using a quarter‐century grassland biodiversity‐global change experiment we show that diversity increasingly enhanced productivity over time irrespective of global change treatments. In contrast, the positive influence of diversity on ecosystem stability strengthened over time under ambient conditions but weakened to varying degrees under global change treatments, largely driven by a greater reduction in species asynchrony under global changes. Thus, over 25 years, CO₂and N enrichment gradually eroded some of the positive effects of biodiversity on ecosystem stability. As elevated CO₂, N eutrophication, and biodiversity loss increasingly co‐occur in grasslands globally, our results raise concerns about their potential joint detrimental effects on long‐term grassland stability. 

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