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Technical Sessions 2021 NOBCChE National Conference September 18, 2021 TECHNICAL SESSIONS Inorganic Chemistry/Physical Chemistry 11:15 AM - 12:15 PM Synthesis and Characterization of Luminescent Self-Assembled Materials for LED Applications. (19) Adedayo Sanni, Graduate Student, Chemistry/Physical, Wayne State University There remains a need to develop facile synthetic approaches to form self-assembled hybrid organic- inorganic nanostructures and enable solution processed lighting technologies. To help enable this technological transformation, we develop a layered, synthetic approach, which allows us to synthesize various analogues of self-assembled Pb-halide perovskites. This synthetic approach allows us to control the appearance of narrowband or broadband luminescence in the light emission spectra of these materials. X-ray diffraction and electron microscopy reveal that the more granular material morphologies correlate with the appearance of broadband features in the spectra of light emitted below the exciton gap of materials formed under high amine concentrations. Photoelectron studies revealed that these materials are similar in composition and possess identical bonding in the bulk. Power-dependent photoluminescence (PL) studies revealed the emission stems from defect sites that can act as electron donors or acceptors. We propose iodide vacancy defect mediated exciton trapping gives rise to the broadband PL we observe in these materials. We extend our synthetic approach to layered hybrid double perovskites containing more environmentally benign metals such as Bi and Ag to replace Pb in the Pb- halide perovskites. In conclusion, our layered synthetic approach provides an avenue to synthesize various emergent luminescent self-assembled materials which could be useful in lighting applications. Key Words: Technical Sessions Inorganic/Physical Chemistry 1 2021 NOBCChE National Conference September 18, 2021 Mechanistic insights enabling homogenous phase formation of multimetallic metal phosphide nanoparticles (39) Ms. Tepora Su'a, Graduate Student, Chemistry, Wayne State University Transition metal phosphide (TMP) nanoparticles have gained tremendous attention within the last decade due to their unique magnetic and catalytic properties. To this end, the synthesis of monometallic (M2P; M = Fe, Co, Ni) TMP nanomaterials have been extensively studied, however establishing colloidal synthetic routes to prepare complex TMP phases remains a challenge. In order to gain mechanistic insights into homogeneous phase formation of bimetallic (M2-xM’xP; M, M’ = Fe, Co, Ni) TMP systems the phosphidation rates of monometallic TMP phases with respect to temperature and time were evaluated in this study. The relative reactivity of metal carbonyl and metal acetylacetonate salt precursors with phosphorus was used to rationalize the synthetic pathways necessary to form bimetallic TMP phases and develop streamlined routes to new trimetallic TMP phases such as Fe2-x-yNixCoyP. Key Words: transtion metal phosphide, nanoparticle, nanomaterial Semiconducting Oxide Materials to Catalyze the Oxygen-Evolution and Chlorine-Evolution Reactions (38) Dr. Bart Bartlett, Professor, Department of Chemistry, University of Michigan Tungsten(VI) oxide (WO3) remains prominent in photoelectrochemical approaches toward the oxygen evolution reaction (OER) from water because of its stability in acidic solution (desirable for its redox partner, the hydrogen evolution reaction). WO3 electrodes were synthesized by spin-coating an ammonium metatungstate sol. Photochromic HxWO3 generated at low concentration during the synthesis leads to an increase the donor density, and depositing an FeOOH electrocatalyst increases the selectivity for the OER. Moreover, fast oxidation reactions such as chloride oxidation and sulfite oxidation show very stable photocurrent density on HxWO3 photoelectrodes as well as Co3O4 spinel dark electrodes, hinting that other redox partners for hydrogen evolution under acidic conditions are plausible. Key Words: Solar Energy, Catalysis, Semiconductors 12:15 PM - 1:15 PM Effect of dissimilar donor/acceptor ligands in metallosurfactants in the modulation of the HOMO-LUMO energy gap required for molecular rectification (68) Technical Sessions Inorganic/Physical Chemistry 2 2021 NOBCChE National Conference September 18, 2021 Mrs. Samudra Amunugama, Graduate Research Assistant, Chemistry, Wayne State University Molecular rectifiers are complementary to solid state diodes which allows directional electron transport. This behavior is important in converting alternating current into direct current. Our approach is to develop metallosurfactants which can be used as molecular rectifiers. We use Langmuir-Blodgett method to deposit well-ordered monolayers of these complexes onto solid substrates and prepare nanoscale devices to analyze the electron transfer properties. For a molecule to act as a rectifier, the frontier molecular orbital energy of the molecule should have comparable energy with the Fermi energy level of the electrode. Therefore, we hypothesize that by introducing electron donor and electron acceptor type substituents into the opposite ends of the molecule will allow us to modulate HOMO-LUMO energy gap, enabling molecular rectification. This research project describes the synthesis and characterization of asymmetric terpyridine based Ru(II) complexes which contain octadecyloxy benzene as the donor group and substituted phenanthroline/terpyridine group as the acceptor group. The cyclic voltammetry data of [(terpyD)RuII(terpyA)]2+ and [(terpyD)RuII(phenA)Cl]2+ surfactants indicate that Ru(II)/Ru(III) occur at ca. 0.86-0.87 V and 0.4-0.3 V respectively. The complexes with electron withdrawing nitro groups shows considerably lower reduction potentials at ca.-1.0 and-1.3 V due to nitro group reduction. However, complexes with unsubstituted phenanthroline and terpyridine ligands show higher reduction potentials at ca. -1.6 and -2.4 V. These redox properties indicate that the HOMO/LUMO energy levels of these complexes can be varied by changing the nature of the electron accepting substituent in the ligand framework. Langmuir-Blodgett studies demonstrate that these complexes form ordered, stable monolayers at the air/water interface. Preliminary Current-voltage studies show that [(terpyD)RuII(phenNO2)Cl]2+ complex acts as a rectifier with a good rectification ratio. This research work allows us to study a new class of asymmetric molecular rectifier that depends on donor/acceptor ligands to obtain directional electron transport. Key Words: Investigation of electron transport of photosensitive ruthenium-based amphiphiles for rectification (72) Abigail Cousino, GRA, Chemistry, Wayne State University Unidirectional electron transport refers to the diode-like property of directional electron conductance. In electrical circuitry, this property is referred to as a ‚Äúrectifier,‚Äù which functions to allow electrons to flow from point A to point B while preventing reversibility, allowing the conversion of an alternating current (AC) into a direct current (DC) and is required for any computational process. The development of photo responsive materials would help improve the field of optoelectronics and micellar luminescence. Our group has successfully developed several ruthenium-based complexes. Using these previously developed methods, due to its excellent photosensitive properties, we have developed a ruthenium bipyridine complex coordinated to bidentate amphiphilic phenol-head groups. We will investigate the electrochemical properties of these systems to evaluate the redox processes, the optical and electronic Technical Sessions Inorganic/Physical Chemistry 3 2021 NOBCChE National Conference September 18, 2021 properties to assess the photostability and emission of these complexes. These [Ru(bpy)2(LPh)]Cl complexes will be deposited on the surface of water to form an ordered film using the Langmuir-Blodgett methodology. These films will then be deposited on gold electrodes have their redox and amphiphilic properties tested evaluated for rectification and photo response. Key Words: In-Situ/Operando Characterization of Titanium Nitride MXenes for Water Splitting (85) Mr. Ekene Uwadiunor, Masters Student, Chemical Engineering, Texas A&M University: The Djire Lab The production of hydrogen fuel from water splitting through the hydrogen evolution reaction (HER) has been investigated for more than a century; yet, there exists no commercial water splitting device because of the lack of an efficient electrocatalyst. The benchmark electrocatalyst for HER is Pt/C; however, its scarcity and high price limit its large-scale utilization. Consequently, great promise has been demonstrated in a new class of two-dimensional (2) materials called MXenes due to a low HER overpotential. In this presentation, I will report on the electrocatalytic performance of MXenes and show that these electrocatalysts are active for HER electrocatalysis. These 2D electrocatalysts possess properties that are desirable for a broad range of electrocatalytic applications. These properties include high electronic conductivity, high surface area and hydrophilicity, heterogeneity of redox-active transition metals, and tunable surface functionalities. More specifically, I will show the report on the detailed mechanisms of HER electrocatalysis on 2D titanium nitride MXenes using in-situ/operando spectroelectrochemical characterization techniques including Raman, Fourier-transform infrared, and ultra-violet visible spectroscopies. Moreover,
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