A5052149401- Electrocatalysts for Energy Conversion
- Fuel Cells and Related Materials
- Electrochemical Analysis and Applications
- Catalytic Processes in Materials Science
- Machine Learning in Materials Science
- Advancements in Solid Oxide Fuel Cells
- Ammonia Synthesis and Nitrogen Reduction
- CO2 Reduction Techniques and Catalysts
- Membrane Separation and Gas Transport
- Electron and X-Ray Spectroscopy Techniques
- Conducting polymers and applications
- Microfluidic and Capillary Electrophoresis Applications
- Advancements in Battery Materials
- Hybrid Renewable Energy Systems
- Advanced Battery Materials and Technologies
- Innovative Microfluidic and Catalytic Techniques Innovation
- Advanced Memory and Neural Computing
- Catalysis and Hydrodesulfurization Studies
- Carbon dioxide utilization in catalysis
- Spectroscopy and Quantum Chemical Studies
- Advanced Battery Technologies Research
- Advanced battery technologies research
- Electrochemical sensors and biosensors
- Advanced Thermoelectric Materials and Devices
- Molecular Junctions and Nanostructures
Universidad del Noreste
2020-2025
Northeastern University
2019-2024
Plug Power (United States)
2023
The H<sub>2</sub>O<sub>ad</sub>↓ and [AM(H<sub>2</sub>O)<sub>x</sub>]<sup>+</sup>promote the HOR HER of Pt by removing H<sub>ad</sub>and OH<sub>ad</sub>, respectively.
The hydrogen oxidation reaction (HOR) in alkaline electrolytes exhibits markedly slower kinetics than that acidic electrolytes. This poses a critical challenge for exchange membrane fuel cells (AEMFCs). is often attributed to the more sluggish Volmer step (hydrogen desorption). It has been shown HOR activity on Pt surface can be considerably enhanced by presence of oxophilic transition metals (TMs) and surface-adsorbed hydroxyl groups TMs (TM-OHad), although exact role TM-OHad remains topic...
A significant barrier to the commercialization of proton exchange membrane fuel cells (PEMFCs) is high cost platinum-based oxygen reduction reaction (ORR) cathode electrocatalysts. One viable solution replace platinum with a platinum-group metal (PGM) free catalyst comparable activity and durability. However, PGM-free development burdened by lack understanding active site formation mechanism during requisite high-temperature synthesis step, thus making rational design challenging. Herein we...
Compared with ex situ measurement, the in measurement is more suitable for inspecting complex electrochemical reactions and improving intelligent energy storage management. However, most of investigation instruments are bulky expensive. Here we demonstrate a miniaturized, portable, low-cost fiber-optic sensing system monitoring capacitance temperature. It can help evaluate self-discharge rate supercapacitors (SCs). The two probes implanted inside SCs to monitor temperature, respectively....
Electrochemical Hydrogen Pumps (EHP) provide a unique highly efficient means of separating and compressing hydrogen with continuous steady-state operation. In this paper, we demonstrate the performance commercially available, polybenzimidazole (PBI) membrane based platform as benchmark for ultra-high efficiency performance. A primary gas mixture CO 2 H ratio 4:1 respectively was selected to EHP s near theoretical Faradaic negligible poisoning due reverse water shift reaction (RWGS). It found...
A grand challenge in electrochemistry is to understand and promote electrochemical processes by exploring exploiting the interface. Herein, we promoted hydrogen evolution oxidation reactions (HER/HOR) of platinum (Pt) base introducing N-methylimidazoles into Pt-water In situ spectroscopic characterization interface together with Quantum Mechanics computations showed that this promotion caused facilitating diffusion hydroxides across holding second layer water close Pt surfaces. We...
Hydrogen has emerged as a promising clean energy carrier and source alternative to fossil fuels(1). Mass production of cost-effective hydrogen without pollution is essential for the so-called economy produced in this process called green hydrogen(2). It uses renewable such wind solar generate electricity produce via water electrolysis, with net-zero carbon emissions. The proton exchange membrane electrolyzer (PEMWE) one most commercially available devices electrolysis. A electrode assembly...
A grand challenge in electrochemistry is to understand and promote electrochemical processes by exploring exploiting the interface. Herein, we promoted hydrogen evolution oxidation reactions (HER/HOR) of platinum base employing N-methylimidazoles reorientate interfacial water against electric field as evidenced situ spectroscopic characterization We accordingly established a unified mechanism which HER/HOR acid proceeds via diffusion proton hydroxide, respectively, through interface...
Abstract Heterogeneous catalysts play a key role in the chemical and energy industries 1 . To date, most industrial-scale heterogeneous catalytic reactions have relied on nanocatalysts 2,3 However, despite significant progress from theoretical, experimental computational studies 4-18 , identifying active sites of alloy remains major challenge. This limitation is mainly due to an incomplete understanding three-dimensional (3D) atomic arrangement different constituents structural...
A Fe-N-C catalyst was synthesized via chemical vapor deposition (CVD) of gas phase FeCl3 onto a metal organic framework (MOF)-derived N-doped carbon (N-C) substrate at 750 ℃. This exhibits an unprecedented current density 0.033 mA·cm-2 0.90 ViR-free (IR-corrected) and 0.044 0.89 in H2-O2 proton exchange membrane fuel cell under 1.0 bar 80 ℃ conditions. The exceptional ORR activity this is attributed to the ultra-high Fe(II)-N4 sites. high sites realized by CVD that allows for ready formation...
A grand challenge in electrochemistry is to understand and promote electrochemical processes by exploring exploiting the interface. Herein, we promoted hydrogen evolution oxidation reactions (HER/HOR) of platinum base employing N-methylimidazoles reorientate interfacial water against electric field as evidenced situ spectroscopic characterization We accordingly established a unified mechanism which HER/HOR acid proceeds via diffusion proton hydroxide, respectively, through interface...
Abstract Heterogeneous catalysts play a key role in the chemical and energy industries 1 . To date, most industrial-scale heterogeneous catalytic reactions have relied on nanocatalysts 2,3 However, despite significant progress from theoretical, experimental computational studies 4-18 , identifying active sites of alloy remains major challenge. This limitation is mainly due to an incomplete understanding three-dimensional (3D) atomic arrangement different constituents structural...
Lithium-selenium batteries are still plagued by low selenium utilization and highly soluble polyselenides. In the present work, sulfur-doped selenium/reduced graphene oxide composite (Se-S/rGO) was successfully designed prepared solution co-impregnation of sulfur within rGO matrix, further used as cathode materials to test electrochemical performance lithium-selenium batteries. The introduction could form C-S chemical bond stable between which effectively limit leaching higher order...
The hydrogen evolution and oxidation reactions (HER/HOR) at the electrode-water control performance of water electrolyzers fuel cells, two important devices for deep decarbonization our economy (1). Platinum (Pt) catalyzes HER/HOR with exceptional activity stability across a wide pH range. However, its progressively decreases by about orders magnitude as increases from 0 to 13 (2, 3). lack understanding this dependence reflects fundamental knowledge gaps in electrochemistry has hindered...
A commercially available, polybenzimidazole (PBI) membrane based electrochemical hydrogen pump (EHP) platform was thoroughly evaluated to generate a benchmark set of performance. primary gas mixture CO 2 and H with ratio 4:1 selected demonstrate the performance EHP s while addressing concerns poisoning effect. There is no indication significant as result reverse water shift reaction (RWGS), nearly Faradaic current efficiencies were successfully achieved. It found that humidification feed at...
Among other metal catalysts, Copper (Cu) is a well-known for electrochemical reduction of CO 2 and its selectivity primarily governed by the applied electrode potential yields wide-range gaseous liquid products. Specifically, electroreduction to formic acid, carbon monoxide (CO) methane were observed at low-potentials <-1.0 V RHE (1), whereas ethylene, ethanol n-propanol yielded high-potentials >-1.0 (2). On hand, catalytic activity Cu inherently contributes from mixed oxidation...
The commercial implementation of CO 2 -electroreduction is driven by realization electrocatalysts capable achieving high-selectivity - Faradaic efficiency >80%, throughputs >200 mA/cm and durability >2000 hrs, to high-value products. Given the energy density advantages existing transport-infrastructure, methanol most desirable liquid commodity among simple (C1-based) -reduction derived electrosynthesis follows through six elementary (electron-proton) charge transfers, involving many...
Hydrogen evolution reaction (HER) and hydrogen oxidation (HOR) are fundamentally practically important in electrochemistry. However, the sluggish kinetics of HER/HOR alkaline solution remains ambiguous has been under extensive debate 1 . Most recently, Snyder’s Tang’s groups 2 reported that caffeine can significantly enhance both HER HOR all Pt surfaces solutions. underlying mechanism for caffeine-induced improvement unexplained. In this work, we tend to resolve puzzle by modulating adding a...
The Oxygen Reduction Reaction (ORR) is the desired cathode reaction in Proton Exchange Membrane Fuel Cells (PEMFCs). Carbon-supported platinum alloy (PtM/C) nanoparticles such as PtCo/C are by far most effective ORR catalysts PEMFCs. However, durability of PtM/C not satisfying, partly owing to dissolution second transition metal M. In this study, conducting accelerated stress tests (ASTs) on a commercial catalyst both rotating disk electrode and PEMFC, we identified that significant fraction...