J. R. Schmidt's research while affiliated with University of Wisconsin–Madison and other places
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Publications (41)
Reductive upgrading of 5-hydroxymethylfurfural (HMF), a biomass-derived platform molecule, to 2,5-dimethylfuran (DMF), a biofuel with an energy density 40% greater than that of ethanol, involves hydrogenolysis of both the aldehyde (C═O) and the alcohol (C-OH) groups of HMF. It is known that when hydrogenation of the aldehyde occurs to form 2,5-bis(...
π-interactions are an important motif in chemical and biochemical systems. However, due to their anisotropic electron densities and complex balance of intermolecular interactions, aromatic molecules represent an ongoing challenge for accurate and transferable force field development. Historically, ab initio force fields for aromatics have not exhib...
The practical electrosynthesis of hydrogen peroxide (H2O2) is hindered by the lack of inexpensive and efficient catalysts for the two-electron oxygen reduction reaction (2e- ORR) in neutral electrolytes. Here, we show that Ni3HAB2 (HAB = hexaaminobenzene), a two-dimensional metal organic framework (MOF), is a selective and active 2e- ORR catalyst i...
Electrochemical valorization of surplus biomass-derived feedstocks, such as glycerol, into high-value chemicals offers a sustainable route for utilization of biomass resources and decarbonization of chemical manufacturing; however, glycerol is typically valorized solely via anodic oxidation, with lower-value products such as hydrogen gas generated...
The crystallization of amorphous solids impacts fields ranging from inorganic crystal growth to biophysics. Promoting or inhibiting nanoscale epitaxial crystallization and selecting its final products underpins applications in cryopreservation, semiconductor devices, oxide electronics, quantum electronics, structural and functional ceramics, and ad...
Hydrogenation and hydrogenolysis are two important reactions for electrochemical reductive valorization of biomass‐derived oxygenates such as 5‐hydroxymethylfurfural (HMF). In general, hydrogenolysis (which combines hydrogenation and deoxygenation) is more challenging than hydrogenation (which does not involve the cleavage of carbon‐oxygen bonds)....
The thermal, acoustic, and dielectric properties of glasses below 1 K are dictated by the interaction of two-level systems (TLS) with strain and electric fields. In a previous paper, we proposed a modified TLS model to quantitatively account for the universally small phonon scattering in glasses at low temperatures. A key ingredient of this model w...
Controlling the magnetic spin states of two-dimensional (2D) van der Waals (vdW) materials with strong electronic or magnetic correlation is important for spintronic applications but challenging. Crystal defects that are often present in 2D materials such as transition metal phosphorus trisulfides (MPS3) could influence their physical properties. H...
5‐Hydroxymethylfurfural (HMF), which can be derived from lignocellulosic biomass, is an important platform molecule that can be used to produce valuable biofuels and polymeric materials. Electrochemical reduction of HMF is of great interest as it uses water as the hydrogen source and achieves desired reduction reactions at room temperature and ambi...
WebMO is a web-based interface for all major quantum chemistry programs. WebMO uses a server–client architecture that installs on a single server or cluster computer and provides access to state-of-the-art computational chemistry programs from a standard web browser. The web interface provides a 3-D molecular editor, pre-defined calculations types,...
Hydrogen peroxide (H 2 O 2 ) is a versatile and green oxidant with a variety of distributed applications such as environmental remediation, disinfection, and household sanitation, but its centralized chemical production via the anthraquinone process poses significant cost, energy, and safety concerns. Decentralized electrosynthesis using renewable...
A multistep phase sequence following the crystallization of amorphous Al2O3 via solid-phase epitaxy (SPE) points to methods to create low-defect-density thin films of the metastable cubic γ-Al2O3 polymorph. An amorphous Al2O3 thin film on a (0001) α-Al2O3 sapphire substrate initially transforms upon heating to form epitaxial γ-Al2O3, followed by a...
Electrochemical synthesis of hydrogen peroxide (H2O2) in acidic solution can enable the electro-Fenton process for decentralized environmental remediation, but robust and inexpensive electrocatalysts for the selective two-electron oxygen reduction reaction (2e⁻ ORR) are lacking. Here, we present a joint computational/experimental study that shows b...
We have developed a flexible, general-purpose microkinetic modeling code, Micki, to analyze complex, heterogeneously catalyzed chemical reactions based upon first-principles calculations. This Python-based code is modular and object oriented, framing the development of microkinetic models in familiar chemical terms. We also present novel approaches...
The vast chemical and structural diversity of metal–organic frameworks (MOFs) opens up the exciting possibility of “crystal engineering” MOFs tailored for particular catalytic or separation applications. Yet the process of reaction discovery, optimization, and scale-up of MOF synthesis remains extremely challenging, presenting significant obstacles...
Symmetry-adapted perturbation theory (SAPT) provides a unique set of advantages for parameterizing next-generation force fields from first principles. SAPT provides a direct, basis-set superposition error free estimate of molecular interaction energies, a physically intuitive energy decomposition, and a seamless transition to an asymptotic picture...
Plane wave density functional theory
(DFT) is a powerful tool for gaining accurate, atomic level insight into bulk and surface structures. Yet, the delocalized nature of the plane wave basis set hinders the application of many powerful post-computation analysis approaches, many of which rely on localized atom-centered basis sets. Traditionally, thi...
The scalable and sustainable production of hydrogen fuel through water splitting demands efficient and robust Earth-abundant catalysts for the hydrogen evolution reaction (HER). Building on promising metal compounds with high HER catalytic activity, such as pyrite structure cobalt disulphide (CoS2), and substituting non-metal elements to tune the h...
Descriptors, quantities that correlate with catalytically interesting quantities, are widely used in computational catalyst screenings. For example, adsorption energies of atomic species (O, C, etc.) are often employed as descriptors of catalytic activity, in conjunction with appropriate scaling and Brønsted–Evans–Polanyi relations. While very succ...
Molecular simulations have had a transformative impact on chemists’ understanding of the structure and dynamics of molecular systems. Simulations can both explain and predict chemical phenomena, and they provide a unique bridge between the microscopic and macroscopic regimes. The input for such simulations is the intermolecular interactions, which...
High-throughput computational screening is an increasingly useful approach to identify promising nanoporous materials for gas separation and adsorption applications. The reliability of the screening hinges on the accuracy of the underlying force fields, which is often difficult to access systematically. To probe the accuracy of common force fields...
Charge transfer across organic-inorganic interfaces plays a vital role in many important applications. Dye-semiconductor systems are the prototypical such interface and provide an excellent platform for exploring the underlying molecular-level factors that affect charge transfer dynamics and efficiency. Experiments often show multi-exponential elec...
We examine the role of the oxide support in modulating the activity and selectivity of common oxide-supported transition metal heterogeneous catalysts. Using representative models of various supported nanoparticle systems, we use computational studies based on density functional theory to decouple the metal–support interaction in terms of electroni...
Molecular simulations play an important role in establishing structure-property relations in complex fluids such as room-temperature ionic liquids. Classical force fields are the starting point when large systems or long times are of interest. These force fields must be not only accurate but also transferable. In this work, we report a physically m...
In this Article, we investigate the effects of binding geometry and intermolecular interactions in monolayers of a rhenium-based dye adsorbed to TiO2. We combine two-dimensional infrared (2D IR) spectroscopy of samples prepared with different dye loadings with density functional theory (DFT) calculations of dye binding energies and vibrational freq...
We examine the role of the metal–support interaction in modulating the activity and selectivity of oxide-supported metal nanoparticles, focusing specifically on the Fischer–Tropsch (FT) synthesis of ethanol (EtOH). Although it is well-known that oxide supports can play a noninnocent role in heterogeneous catalysis, a comprehensive and predictive pi...
We use molecular simulations to study the gas adsorption properties of metal–organic framework (MOF) materials composed of mixtures of linker groups, focusing on the prototypical MTV-MOF-5 systems. While MOF functionalization is well-known to influence gas uptake, we show that the absolute gas uptake is frequently not merely a sum of linear contrib...
A new tool to elucidate chemical bonding in bulk solids, surfaces and nanostructures has been developed. Solid State Adaptive Natural Density Partitioning (SSAdNDP) is a method to interpret chemical bonding in terms of classical lone pairs and two-center bonds, as well as multi-center delocalized bonds. Here we extend the domain of AdNDP to bulk ma...
We present a multi-scale, hierarchical, approach for developing lattice models to estimate adsorption in nano-porous sorbents, derived on the basis of underlying atomistic potentials. This approach is a generalization of earlier work in zeolites (where the specific adsorption sites are easily definable) to encompass both specific as well as diffuse...
We use electronic structure calculations to examine the impact of trace flue gas contaminants (nitrogen oxides, sulfur oxides, and their hydrates) on two promising coordinatively unsaturated metal–organic framework (MOF) sorbents. Such MOFs have been the subject of recent intense study since their unsaturated “open metal” sites yield dramatically e...
We extend our existing methodology for generating physically motivated, tailored ab initio force fields via symmetry-adapted perturbation theory (SAPT). The revised approach naturally yields transferable atomic exchange, charge penetration, and dispersion parameters, facilitating the creation of versatile, optimized force fields; this approach is g...
Natural bond orbital (NBO) analysis is a powerful analysis technique capable of generating intuitive chemical representations of otherwise complex quantum mechanical electronic structure results, yielding a localized “Lewis-like” description of bonding and reactivity. We generalize this algorithm to periodic systems, thus expanding the scope of NBO...
We develop a physically motivated many-body force field for CO(2), incorporating explicit three-body interactions parameterized on the basis of two- and three-body symmetry adapted perturbation theory (SAPT) calculations. The potential is parameterized consistently with, and builds upon, our successful SAPT-based two-body CO(2) model ("Schmidt, Yu,...
We present an entirely ab initio methodology, based on symmetry adapted perturbation theory (SAPT), for constructing force-fields to study CO2 adsorption in nanoporous zeolitic imidazolate frameworks (ZIFs). Our approach utilizes the SAPT energy decomposition to generate physically motivated force fields for the CO2-ZIF interaction, with explicit t...
We present a novel methodology for developing physically motivated, first-principles polarizable force fields and apply these techniques to the specific cases of CO(2) and N(2). Exchange, electrostatic, induction, and dispersion interaction parameters were fit to symmetry adapted perturbation theory (SAPT) dimer energy calculations, with explicit t...
Hydrotalcites (HTs) are an important class of heterogeneous catalysts for a wide variety of traditionally base-catalyzed organic transformations and have been considered as an alternative to homogeneous catalysts in the transesterification of fats/oils in biodiesel production. Previous experimental observations show that HT-like materials possess a...
We have measured the electron injection kinetics of four rhenium bipyridine complexes (Re1C, ReEC, Re1TC, and Re2TC) on TiO2 nanocrystalline films using transient infrared spectroscopy. The self-assembled monolayer formation of these complexes was characterized by UV-visible spectroscopy, infrared reflection absorption spectroscopy, and X-ray photo...
Citations
... To date, a wide range of materials have been investigated for their excellent electrochemical performances in 2e − ORR (Figure 1a), 49 including noble metals and their alloys, 50 weakens the O−O bond, leading to pronounced H 2 O production through O−O bond cleavage. Because carbonbased materials (carbon nanotubes, carbon black, porous carbon, etc.) exhibit diminished ORR activity in acidic electrolyte based real-world applications, necessitating heightened catalyst loading. ...
... [1][2][3][4][5][6] The traditional anthraquinone self-oxidation method or the direct synthesis of H 2 O 2 from H 2 and O 2 has problems, such as complex production process, high energy consumption, and low safety. [7][8][9][10][11][12] In recent years, electrocatalytic oxygen reduction reaction (ORR) to H 2 O 2 in acidic media has attracted much attention (O 2 + 2H + + 2e − → H 2 O 2 E • = 0.70 V vs. reversible hydrogen electrode [RHE]). 13,14 Compared with alkaline electrolytes, acidic electrolytes can effectively inhibit the self-decomposition of H 2 O 2 and have good compatibility with commercial proton exchange membrane electrolysis devices, which can significantly reduce production costs. ...
... Various catalysts have been employed for the electrocatalytic synthesis of H 2 O 2 to date, including noble metals and their alloys, non-noble metals and their oxides, carbides, non-metallic carbon-based catalysts, and single-atom catalysts [22][23][24][25][26][27][28]. Among the numerous catalysts reported, single-atom catalysts (SACs) with isolated metal atoms anchored on the surface of the support have combined the advantages of both homogeneous and heterogeneous catalysts, offering ultra-high atom utilization, high activity, and high selectivity. ...
... 20 Examples of oxides besides BaTiO 3 that can be crystallized epitaxially from an amorphous thin-film precursor using SPE include Al 2 O 3 , SrTiO 3 , TiO 2 , and BiFeO 3 , among many others. 18,[21][22][23][24] Key differences have emerged among materials, which makes a detailed study of the crystallization in each system important. ...
... [46,56] Lastly, towards the end of the chromatogram is 5-methylfurfural (MF), which is a hydrogenolysis product of the alcohol group on the HMF molecule. [57] The retention times for the rest of the unidentified peaks did not match with any standard chemicals available and were highly overlapping, thus they remained unidentified. The presence of 5,5′-bis (hydroxymethyl)furil peak was observed in all chromatograms, particularly those utilizing a Pt cathode at low current and a Ni-P cathode at all currents. ...
... In recent years, experiments with quantum circuits have introduced ways to directly tune the TLS energy to reveal more information about the TLSs that couple strongly to devices. The energy of an individual TLS can be written [9,104] as, ...
... The Raman spectra of different samples demonstrated four inplane E g and three out-of-plane A 1g vibrational modes within the range of 100-600 cm −1 . The peak below 150 cm −1 was attributed to the Ni 2+ metal ion vibrations in NiPS 3 , while other peaks below 600 cm −1 were associated with the vibrational modes of the PS 3 group and P-P bond ( Fig. 2b and Supplementary Fig. 14) 18 . The electron paramagnetic resonance (EPR) spectra of NiPS 3 and Ru-NiPS 3 were performed to study the concentration of vacancies. ...
... [18,19] While electrocatalysts and reduction conditions to produce BHMF efficiently and selectively have been reported, [16,20] electrochemical DMF production has been more challenging. [12] In general, hydrogenolysis of the aldehyde and alcohol groups (which involves deoxygenation) is more difficult than hydrogenation of the aldehyde group. Furthermore, it has been reported that for electrochemical reduction, once the C=O group of HMF is hydrogenated to form BHMF, the hydrogenolysis of the CÀ OH bond does not occur readily, making BHMF a terminal product (Figure 1). ...
... Since symmetry breaking is possible for cyclic molecules (see, for example Ref. [34]) the symmetry of the nanobracletes after the DFTbased structure optimization was determined by the algorithm [35] implemented in the free WebMO server software [36,37]. All optimized nanobracelets have only positive vibrational frequencies therefore the optimized structures correspond to the true minima. ...
Reference: Carbon nanobracelets
... [37][38][39][40] The large mosaic width apparent in Fig. 2(c) is similar to the case of Al 2 O 3 crystallized under annealing conditions that produced inclusions of a polymorphic phase. 41 The out-of-plane lattice parameter determined using the 00L reflections of the cube-on-cube component was 4.015 ± 0.004 Å. One of the {222} reflections of the cube-on-cube component was probed by tilting the sample and was found at 2θ = 83.1 ± 0.4l ○ , consistent with a cubic lattice parameter of 4.03 ± 0.01 Å. ...