harvard6The DASH digital repository system captures, stores, indexes, preserves, and distributes digital research material.https://dash.harvard.edu:4432024-03-18T07:05:12Z2024-03-18T07:05:12ZAn Extremely Stable, Highly Soluble Monosubstituted Anthraquinone for Aqueous Redox Flow BatteriesAmini, KianaKerr, Emily F.George, Thomas Y.Alfaraidi, Abdulrahman M.Jing, YanTsukamoto, TatsuhiroGordon, Roy G.Aziz, Michaelhttps://nrs.harvard.edu/1/373779592024-03-15T18:56:55Z2023-01-24T05:00:00ZAn Extremely Stable, Highly Soluble Monosubstituted Anthraquinone for Aqueous Redox Flow Batteries
Amini, Kiana; Kerr, Emily F.; George, Thomas Y.; Alfaraidi, Abdulrahman M.; Jing, Yan; Tsukamoto, Tatsuhiro; Gordon, Roy G.; Aziz, Michael
An extremely stable, energy‐dense (53.6 Ah L<jats:sup>−1</jats:sup>, 2 <jats:sc>m</jats:sc> transferrable electrons), low crossover (permeability of <1 × 10<jats:sup>−13</jats:sup> cm<jats:sup>2</jats:sup> s<jats:sup>−1</jats:sup> using Nafion 212 (Nafion is a trademark polymer from DuPont)), and potentially inexpensive anthraquinone with 2‐2‐propionate ether anthraquinone structure (abbreviated 2‐2PEAQ) is synthesized and extensively evaluated under practically relevant conditions for use in the negolyte of an aqueous redox flow battery. 2‐2PEAQ shows a high stability with a fade rate of 0.03–0.05% per day at different applied current densities, cut‐off voltage windows, and concentrations (0.1 and 1.0 <jats:sc>m</jats:sc>) in both a full cell paired with a ferro/ferricyanide posolyte as well as a symmetric cell. 2‐2PEAQ is further shown to have extreme long‐term stability, losing only ≈0.01% per day when an electrochemical rejuvenation strategy is employed. From post‐mortem analysis (nuclear magnetic resonance (NMR), liquid chromatography–mass spectrometry (LC‐MS), and cyclic voltammetry (CV)) two degradation mechanisms are deduced: side chain loss and anthrone formation. 2‐2PEAQ with the ether linkages attached on carbons non‐adjacent to the central ring is found to have three times lower fade rate compared to its isomer with ether linkages on the carbon adjacent to the central quinone ring. The present study introduces a viable negolyte candidate for grid‐scale aqueous organic redox flow batteries.
2023-01-24T05:00:00ZHigh Energy Density Aqueous Flow Battery Utilizing Extremely Stable, Branching-Induced High-Solubility Anthraquinone near Neutral pHKerr, Emily F.Tang, ZhijiangGeorge, Thomas Y.Jin, ShijianFell, Eric M.Amini, KianaJing, YanWu, MinGordon, Roy G.Aziz, Michaelhttps://nrs.harvard.edu/1/373779582024-03-15T18:53:49Z2022-12-20T05:00:00ZHigh Energy Density Aqueous Flow Battery Utilizing Extremely Stable, Branching-Induced High-Solubility Anthraquinone near Neutral pH
Kerr, Emily F.; Tang, Zhijiang; George, Thomas Y.; Jin, Shijian; Fell, Eric M.; Amini, Kiana; Jing, Yan; Wu, Min; Gordon, Roy G.; Aziz, Michael
2022-12-20T05:00:00ZRitual Relationships with Copal IncenseMendoza, Rebecca Jolenehttps://nrs.harvard.edu/1/373779572024-03-15T18:51:03Z2023-08-03T04:00:00ZRitual Relationships with Copal Incense
Mendoza, Rebecca Jolene
Copal, an aromatic tree resin, has long been harvested and offered as incense in Indigenous communities of Mesoamerica. In contemporary academic contexts copal and other non-human materials and entities are often conceived of through objectifying ontologies. However, metaphysical frameworks grounded in life forces such as teotl (Nahuatl) and ch’ulel (various Mayan languages) offer alternative insights to human relationships with other-than-human worlds. Copal can be traced temporally and spatially, across thousands of miles and millennia. Specifically, we can follow copal from Pre-Columbian Mesoamerica across the northern border of Mexico into contemporary rituals in Denver, Colorado where copal continues to burn in Danza ceremonies. Beyond these ritual spaces, copal also moves in neoliberal and new age contexts as a market commodity and is stored in museum collections as ‘artifact’. Centering Mesoamerican metaphysics offers a counternarrative to these versions of settler-colonial objectification. Ultimately, precolonial and decolonial kinship practices can inform reinterpretations and reimagining of copal in the processes of museum and market appropriation.
2023-08-03T04:00:00ZSubstandard housing and the risk of COVID-19 infection and disease severity: A retrospective cohort studyRobb, KatharineAhmed, RowanaWong, JohnLadd, Elissade Jong, Jorrithttps://nrs.harvard.edu/1/373779562024-03-15T18:31:07Z2024-03-01T05:00:00ZSubstandard housing and the risk of COVID-19 infection and disease severity: A retrospective cohort study
Robb, Katharine; Ahmed, Rowana; Wong, John; Ladd, Elissa; de Jong, Jorrit
2024-03-01T05:00:00Z