A5018716453- Advanced battery technologies research
- CO2 Reduction Techniques and Catalysts
- Electrochemical Analysis and Applications
- Electrocatalysts for Energy Conversion
- Ionic liquids properties and applications
- Fuel Cells and Related Materials
- Catalytic Processes in Materials Science
- Crystallization and Solubility Studies
- X-ray Diffraction in Crystallography
- Advanced Photocatalysis Techniques
- Advanced Battery Technologies Research
- Gas Sensing Nanomaterials and Sensors
- Advanced Battery Materials and Technologies
- Electrochemical sensors and biosensors
- Carbon Dioxide Capture Technologies
- Hybrid Renewable Energy Systems
- Advanced Sensor and Energy Harvesting Materials
- Extraction and Separation Processes
- Magnetic Properties and Synthesis of Ferrites
- Membrane-based Ion Separation Techniques
- Thermal Expansion and Ionic Conductivity
- Advanced Antenna and Metasurface Technologies
- Advancements in Solid Oxide Fuel Cells
- Membrane Separation and Gas Transport
- Molten salt chemistry and electrochemical processes
Harvard University
2020-2024
Harvard University Press
2023-2024
Collaborative Innovation Center of Chemistry for Energy Materials
2017-2023
National Synchrotron Radiation Laboratory
2017-2023
University of Science and Technology of China
2017-2023
Oxidative carbonylation of methane is an appealing approach to the synthesis acetic acid but limited by demand for additional reagents. Here, we report a direct CH3COOH solely from CH4 via photochemical conversion without This made possible through construction PdO/Pd-WO3 heterointerface nanocomposite containing active sites activation and C-C coupling. In situ characterizations reveal that dissociated into methyl groups on Pd while oxygen PdO responsible carbonyl formation. The cascade...
Abstract Photoelectrochemical (PEC) conversion of methane (CH 4 ) has been extensively explored for the production value‐added chemicals, yet remains a great challenge in high selectivity toward C 2+ products. Herein, we report optimization reactivity hydroxyl radicals ( . OH) on WO 3 via facet tuning to achieve efficient ethylene glycol from PEC CH conversion. A combination materials simulation and trapping test provides insight into OH different facets , showing highest surface‐bound {010}...
Carbon-supported single-atom catalysts (SACs) are extensively studied because of their outstanding activity and selectivity toward a wide range catalytic reactions. Amidst its development, excess dopants (e.g., nitrogen) always required to ensure the high loading content SACs on carbon support. However, use is accompanied by formation miscellaneous structures (particularly uncoordinated N species) catalysts, leading adverse effects performance. Herein, synthesis carbon-supported Ni with...
Electrochemically driven CO2 capture processes utilizing redox-active organics in aqueous flow chemistry show promise for nonflammability, continuous-flow engineering and the possibility of being at a high current density by inexpensive, clean electricity. We that deprotonated hydroquinone–CO2 adducts, whose insolubility limits utility quinone–hydroquinone redox couple, become soluble when alkylammonium cations are introduced. Consequently, we introduced groups to anthraquinone via covalent...
Abstract An iron complex, tris(4,4′‐bis(hydroxymethyl)‐2,2′‐bipyridine) dichloride is reported, which operates at near‐neutral pH with a redox potential of 0.985 V versus SHE. This high compound employed in the posolyte an aqueous flow battery, paired bis(3‐trimethylammonio)propyl viologen tetrachloride negolyte, exhibiting open‐circuit voltage 1.3 pH. It demonstrates excellent cycling performance low temporal capacity fade rate 0.07% per day over 35 days cycling. The extended lifetime...
Carbon dioxide capture and management are critical technologies for achieving carbon neutrality mitigating the impacts of global warming. One promising approach decarbonization involves electrochemical generation concentrated acid...
Photoelectrochemical (PEC) conversion of methane (CH4) has been extensively explored for the production value-added chemicals, yet remains a great challenge in high selectivity toward C2+ products. Herein, we report optimization reactivity hydroxyl radicals (.OH) on WO3 via facet tuning to achieve efficient ethylene glycol from PEC CH4 conversion. A combination materials simulation and trapping test provides insight into .OH different facets WO3, showing highest surface-bound {010} facets....
Carbon efficiency is one of the most pressing problems carbon dioxide electroreduction today. While there have been studies on anion exchange membrane electrolyzers with (gas) and bipolar bicarbonate (aqueous) feedstocks, both suffer from low efficiency. In electrolyzers, this due to carbonate crossover, whereas in exsolution solution culprit. Here, we first elucidate root cause liquid thermodynamic calculations then achieve carbon-efficient by adopting a near-neutral-pH cation membrane,...
Abstract Impedance matching modulation of the electromagnetic wave (EMW) absorbers toward broad effective absorption bandwidth (EAB) is ultimate aim in EMW attenuation applications. Here, a Joule heating strategy reported for preparation Co‐loaded carbon (Co/C) absorber with tunable impedance characteristics. Typically, size Co can be regulated to range from single‐atoms clusters, and nanocrystals. The varied sizes combined different graphitization degrees result relative input impedances...
Abstract The electrocatalytic oxygen evolution reaction (OER) is a highly important that requires relatively high overpotential and determines the rate of water splitting—a process for producing hydrogen. overall OER performance often largely limited by uncontrollable interface when active catalysts are loaded on conductive supports, which polymer binders widely used, but inevitably block species transportation channels. Here, scalable fabrication approach to freestanding graphitized carbon...
We present two novel experimental techniques designed to quantify the contributions of nucleophilicity-swing and pH-swing mechanisms carbon capture in electrochemical aqueous quinone-based CO2 process. Through thermodynamic analysis, we elucidate intricate interplay between these mechanisms, emphasize critical role understanding this material discovery cycle for applications. This insight prompts development innovative situ techniques. The first technique capitalizes on discernible voltage...
Climate change caused by the accumulation of anthropogenic CO2 emissions motivates development and deployment cost-effective, scalable, energetically efficient techniques to capture from point or diffuse sources. Electrochemically-driven processes utilizing redox-active organics in aqueous flow chemistry show promise for nonflammability, continuous-flow engineering, possibility being driven at high current density inexpensive, clean electricity. We that deprotonated hydroquinone-CO2 adducts,...
Proton-coupled electrochemical reactions as proton pumps can facilitate in situ or ex pH recovery and capacity rebalancing within single-membrane pH-decoupling batteries.
Aqueous redox flow batteries require long-term stable molecules for electrical energy storage. Anthraquinones, especially ether bond-decorated ones, experience two dominant decomposition pathways, including side-chain loss and anthrone formation. With the aid of DFT calculations, we designed an anthraquinone (3-NH2-2-2PEAQ) bearing substituent a neighboring NH2 group, which suppresses both these mechanisms exhibits high solubility 1.1 M. When paired with ferrocyanide in full cell, this...
Aqueous redox flow batteries (ARFBs) constitute a promising technology for grid-scale electricity storage, but it is challenging to implement cell voltages exceeding the 1.23 V thermodynamic water splitting window with high Coulombic efficiency and long lifetime. pH decoupling – creation of difference between negolyte posolyte can broaden operating voltage improve long-term operational stability. This penalizes efficiency, however, due acid-base crossover induced by gradient. As varies...
Climate change caused by the accumulation of anthropogenic CO2 emissions motivates development and deployment cost-effective, scalable, energetically efficient techniques to capture from point or diffuse sources. Electrochemically-driven processes utilizing redox-active organics in aqueous flow chemistry show promise for nonflammability, continuous-flow engineering, possibility being driven at high current density inexpensive, clean electricity. We that deprotonated hydroquinone-CO2 adducts,...
Aqueous redox flow batteries (ARFBs) constitute a promising technology for cost-effective and scalable storage of intermittent renewable energy from sources like wind solar. For long discharge-duration (> 8 h), these offer unique advantage by decoupling power generation, providing level design versatility scalability that traditional rechargeable can hardly match. Typically, the negolyte posolyte ARFBs exhibiting long-term operation have roughly same pH. In contrast, pH-decoupling aqueous...
<title>Abstract</title> Hydrogen peroxide (H<sub>2</sub>O<sub>2</sub>) is predominantly produced via the centralized thermocatalytic hydrogenation-anthraquinone oxidation (t-AO) process, a conventional nonaqueous method. Electrifying such processes with improved selectivity remains significant challenge. Here, we present multi-phase electrochemical anthraquinone autoxidation (e-AO) system that leverages an interfacial hydrogen atom transfer reaction facilitated by heterogeneous molecular...
Current hydrogen peroxide (H 2 O ) production is dominantly made through thermocatalytic anthraquinone autoxidation (t-AO) method at industrial scale. Incumbent hydrogenation involves pressurized input and requires palladium-based catalysts that can over-reduce to non-reactive molecules. A considerable amount of energy associated with the distillation transportation H , which could be avoided decentralized electrochemical methods. We developed an interfacial atom transfer reaction between...
Climate change caused by the accumulation of anthropogenic CO 2 emissions motivates development and deployment cost-effective, scalable, modular, energetically efficient techniques to capture from point or diffuse sources. Electrochemically-driven processes utilizing redox-active organics in aqueous flow chemistry operating at ambient temperature pressure show promise for nonflammability, continuous-flow engineering, possibility being driven high current density inexpensive, clean...