Structure Of Na Research Articles

Air-Stable Na3.5C6O6 as a Sodium Compensation Additive in Cathode of Na-Ion Batteries.

Sodium-ion battery (SIB) is a candidate for the stationary energy storage systems because of the low cost and high abundance of sodium. However, the energy density and lifespan of SIBs suffer severely from the irreversible consumption of the Na-ions for the formation of the solid electrolyte interphase (SEI) layer and other side reactions on the electrodes. Here, Na3.5C6O6 is proposed as an air-stable high-efficiency sacrificial additive in the cathode to compensate for the lost sodium. It is characteristic of low desodiation (oxidation) potential (3.4-3.6V vs. Na+/Na) and high irreversible desodiation capacity (theoretically 378 mAh g-1). The feasibility of using Na3.5C6O6 as a sodium compensation additive is verified with the improved electrochemical performances of a Na2/3Ni1/3Mn1/3Ti1/3O2ǀǀhard carbon cells and cells using other cathode materials. In addition, the structure of Na3.5C6O6 and its desodiation path are also clarified on the basis of comprehensive physical characterizations and the density functional theory (DFT) calculations. This additive decomposes completely to supply abundant Na ions during the initial charge without leaving any electrochemically inert species in the cathode. Its decomposition product C6O6 enters the carbonate electrolyte without bringing any detectable negative effects. These findings open a new avenue for elevating the energy density and/or prolonging the lifetime of the high-energy-density secondary batteries.

Improving separation of CH4 and N2 by adsorption on zeolite Y Ion–Exchanged with ammonium Cations: An experimental and Grand–Canonical Monte Carlo (GCMC) simulation investigation

The separation of methane (CH4) from industrially–important nitrogen (N2)-rich vent streams such as those in liquefied natural gas processing plants is challenging. Pressure swing adsorption (PSA) is a promising, cost–effective solution in gas separation, especially for small–scale units. Further development and commercialisation of PSA–based technologies require access to low–cost, selective adsorbent materials. The current work investigates the improved separation of CH4 from N2 by TMA–Y zeolite which is obtained from the ion exchange treatment of Na–Y zeolite with the ammonium salt tetramethylammonium chloride (TMACl). TMA–Y is commercially called Ionic Liquidic Zeolite (ILZ), patented at The University of Western Australia, and has now been demonstrated on tonne–scale. In particular, we use a combination of experimental and molecular simulation techniques to provide insights into the high CH4–over–N2 selectivity of TMA–Y. For this, we obtain equilibrium isotherms of CH4 and N2 on Na–Y at different temperatures and pressures before and after ion exchange. The true selectivities of the zeolite samples are determined using the Ideal Adsorbed Solution Theory (IAST) and binary–gas grand–canonical Monte Carlo (GCMC) molecular simulations. From experiments and IAST calculations, we report an increase of >110% in the CH4/N2 selectivity of Na–Y after treatment with TMACl (from 2.2 to 4.7 at 5.0 MPa and 303.15 K for a mixture of 0.1 CH4+0.9 N2 mol.mol−1). GCMC molecular simulations provide a detailed picture of the molecular origins of this effect. Specifically, the introduction of TMA+ ions into the structure of Na–Y zeolite leads to a reduction of the available adsorption volume by more than 40% (from 0.30 to 0.17 cm3.g−1 with N2 as the probe molecule) for both adsorbing gas species (i.e. CH4 and N2). However, at the same time, this leads to stronger CH4–cation interactions due to the much higher affinity of TMA+ cations (5 kJ.mol−1) than extra–framework Na+ cations (1 kJ.mol−1) towards CH4. The overall effect of these two trends combined is the higher selectivity of the resulting TMA–Y zeolite for CH4. These molecular insights are useful in the systematic engineering of new materials with improved separation performance.

Stabilizing the Deep Sodiation Process in Layered Sodium Manganese Cathodes by Anchoring Boron Ions.

Advanced high-energy-density sodium-ion batteries (SIBs) are inseparable from cathode materials with high specific capacities. Layered manganese-rich oxides (NaxMnO2, 0.6≤x≤1) are promising cathode materials owing to their ease of intercalation and extraction of a considerable amount of sodium ions. However, lattice interactions, especially electrostatic repulsive forces and anisotropic stresses, are usually caused by deep desodiatin/sodiation process, resulting in intragranular cracks and capacity degradation in SIBs. Here, boron ions are introduced into the layered structure to build up B─O─Mn bonds. The regulated electronic structure in Na0.637B0.038MnO2 (B-NMO) materials inhibits the deformation of MnO6 octahedra, which finally achieves a gentle structural transition during the deep sodiation process. B-NMO electrode exhibits a high capacity (141mAhg-1) at 1C with a capacity retention of 81% after 100 cycles. Therefore, anchoring boron to manganese-rich materials inhibits the detrimental structural evolution of deep sodiation and can be used to obtain excellent cathode materials for SIBs.

Haldane topological spin-1 chains in a planar metal-organic framework

Haldane topological materials contain unique antiferromagnetic chains with symmetry-protected energy gaps. Such materials have potential applications in spintronics and future quantum computers. Haldane topological solids typically consist of spin-1 chains embedded in extended three-dimensional (3D) crystal structures. Here, we demonstrate that [Ni(μ−4,4′-bipyridine)(μ-oxalate)]n (NiBO) instead adopts a two-dimensional (2D) metal-organic framework (MOF) structure of Ni2+ spin-1 chains weakly linked by 4,4′-bipyridine. NiBO exhibits Haldane topological properties with a gap between the singlet ground state and the triplet excited state. The latter is split by weak axial and rhombic anisotropies. Several experimental probes, including single-crystal X-ray diffraction, variable-temperature powder neutron diffraction (VT-PND), VT inelastic neutron scattering (VT-INS), DC susceptibility and specific heat measurements, high-field electron spin resonance, and unbiased quantum Monte Carlo simulations, provide a detailed, comprehensive characterization of NiBO. Vibrational (also known as phonon) properties of NiBO have been probed by INS and density-functional theory (DFT) calculations, indicating the absence of phonons near magnetic excitations in NiBO, suppressing spin-phonon coupling. The work here demonstrates that NiBO is indeed a rare 2D-MOF Haldane topological material.

Unveiling the potential of P3 phase in enhancing the electrochemical performance of a layered oxide cathode

Controlling the phase structure of layered oxide cathodes is considered an effective strategy to realize high-performance Na-ion batteries. Herein, we unveil the synthesis and electrochemical behavior of a hitherto unreported monophasic P3 structure in Na0.75Mn0.75Ni0.25O2 (NNM) calcined at 750 °C. The conversion of P3 to a P2-type single phase (at 850 °C) upon increasing the calcination temperature, with P2/P3 biphasic structures at intermediate temperatures, was confirmed by the Rietveld refinement of the x-ray diffraction (XRD) data. The monophasic P3 cathode showed a specific capacity of 190 mAh/g at 0.1 C and retained 90% of its initial capacity after 200 cycles at 1 C in the 1.5–4.2 V range. The galvanostatic charge-discharge (GCD) curves also showed a decrease in specific capacity with an increase in the P2 phase. The P3-dominant biphasic cathodes displayed superior rate performance, exhibiting capacities up to 97 mAh/g at 6 C, attributed to their smaller particle size and optimal P2/P3 phase fraction. Operando Synchrotron XRD data confirmed the suppression of P3→O′3 + O3 transformation in the biphasic cathode that was present in the monophasic P3 structure during charge-discharge cycling. The superior electrochemical performance and excellent structural stability of biphasic cathodes make them ideal for stationary and mobile storage applications.

Molecular and Structural Characterization of Isomeric Compounds in Atmospheric Organic Aerosol Using Ion Mobility-Mass Spectrometry.

Secondary organic aerosol (SOA) formed through multiphase atmospheric chemistry makes up a large fraction of airborne particles. The chemical composition and molecular structures of SOA constituents vary between different emission sources and aging processes in the atmosphere, which complicates their identification. In this work, we employ drift tube ion mobility spectrometry with quadrupole time-of-flight mass spectrometry (IM-MS) detection for rapid gas-phase separation and multidimensional characterization of isomers in two biogenic SOAs produced from ozonolysis of isomeric monoterpenes, d-limonene (LSOA) and α-pinene (PSOA). SOA samples were ionized using electrospray ionization (ESI) and characterized using IM-MS in both positive and negative ionization modes. The IM-derived collision cross sections in nitrogen gas (DTCCSN2 ) for individual SOA components were obtained using multifield and single-field measurements. A novel application of IM multiplexing/high-resolution demultiplexing methodology was employed to increase sensitivity, improve peak shapes, and augment mobility baseline resolution, which revealed several isomeric structures for the measured ions. For LSOA and PSOA samples, we report significant structural differences of the isomer structures. Molecular structural calculations using density functional theory combined with the theoretical modeling of CCS values provide insights into the structural differences between LSOA and PSOA constituents. The average DTCCSN2 values for monomeric SOA components observed as [M + Na]+ ions are 3-6% higher than those of their [M - H]- counterparts. Meanwhile, dimeric and trimeric isomer components in both samples showed an inverse trend with the relevant values of [M - H]- ions being 3-7% higher than their [M + Na]+ counterparts, respectively. The results indicate that the structures of Na+-coordinated oligomeric ions are more compact than those of the corresponding deprotonated species. The coordination with Na+ occurs on the oxygen atoms of the carbonyl groups leading to a compact configuration. Meanwhile, deprotonated molecules have higher DTCCSN2 values due to their elongated structures in the gas phase. Therefore, DTCCSN2 values of isomers in SOA mixtures depend strongly on the mode of ionization in ESI. Additionally, PSOA monomers and dimers exhibit larger DTCCSN2 values (1-4%) than their LSOA counterparts owing to more rigid structures. A cyclobutane ring is present with functional groups pointing in opposite directions in PSOA compounds, as compared to noncyclic flexible LSOA structures, forming more compact ions in the gas phase. Lastly, we investigated the effects of direct photolysis on the chemical transformations of selected individual PSOA components. We use IM-MS to reveal structural changes associated with aerosol aging by photolysis. This study illustrates the detailed molecular and structural descriptors for the detection and annotation of structural isomers in complex SOA mixtures.

Insect multimeric G-quadruplexes fold into antiparallel structures of different compactness and stability in K+ and Na+ solutions

Insect telomeric G-quadruplexes have a more compact and stable structure in Na+ solutions, and have a different binding pattern to ligand BMPQ-1 in K+ and Na+ solutions.

New sights on derived behaviors of methane hydrate molecular structure in Na+/Cl- ions invading process

The method of non-equilibrium molecular dynamics simulation (NEMD) was used to investigate the Na+/Cl- migration characteristics in methane hydrate (MH) phase under a static electric field. The molecular structure derived behaviors of MH were analyzed in this study. A hydrate-solution two-phase system was set up and the electric field of 0.5 V/nm perpendicular to the interface was applied to promote ions migration into MH phase. The results showed that a series of random semi-open cages composed of Na+/Cl- ions and water molecules containing Na+/Cl- ions, which are essentially metastable, formed rapidly. Then, only a few parts of cages could recovery the original structure after ions migration process. Finally, the migration of Na+/Cl- caused hydrate cages breakage. Therefore, the Na+/Cl- migration process into MH phase was defined as ions invading in this study. In contrast, Cl- will cause greater distortion of the MH cage structures. What’s more, the variations in free energy during ions invading process was also calculated. It was found that Na+/Cl- have no adsorption effect at the hydrate surface, and the electrostatic field makes the Na+/Cl- easier to invade into the MH phase. According to the free energy during ion invasion process, Na+/Cl- ions have no adsorption effect on hydrate surface, and the electrostatic field makes Na+/Cl- ions more easily invade into MH phase. Moreover, the electrostatic field has weak effect on hydration shell of Na+/Cl- in solution phase. The positions and orientation angle distribution of water molecules around the ions in hydrate phase are similar to that in the solution phase, indicating that the ions in hydrate phase are still keep in hydration state. These MD-based findings, particularly those involving hydrate molecular structure, may be instructive for the coexistence of MH and ions in sea water.

Sodium capture mechanism by simulated silica/aluminosilicate slag at high temperatures

• Transition of Al-VI to Al-IV/Al-V in aluminosilicate is a prerequisite for Na capture. • The SCE of pure SiO 2 and Al 2 O 3 is lower than aluminosilicate at high temperatures. • There exist optimal ratios of CaO and MgO in aluminosilicates for Na capture. • The addition of Fe 2 O 3 in aluminosilicates inhibits sodium capture. This paper aims to clarify the sodium capture mechanism by silica/aluminosilicate slag under conditions of cyclone combustion process of high-alkali coal. A series of simulated silica and aluminosilicate slag containing various proportions of SiO 2 , Al 2 O 3 , CaO, MgO, Fe 2 O 3 and NaCl were prepared and exposed in a tube furnace at 1300–1500 °C to simulate a cyclone combustion environment. Results show that the transition from six-coordinated Al (Al-VI) to four- and five-coordinated Al (Al-IV and Al-V) is an essential step for the sodium capture process by molten aluminosilicates. The aluminosilicate with a molar ratio of SiO 2 to Al 2 O 3 (Si/Al) between 3:1 and 10:1 shows the best Na capture performance due to the complete transition of Al in it. Beyond this range, excess Al-VI or SiO 2 will be produced and reduce the sodium capture ability of aluminosilicate. A small amount of CaO or MgO in the aluminosilicates can promote sodium capture efficiency (SCE) due to their fluxing effects. Whereas high content of CaO or MgO will inhibit the Na capture owing to the competing reactions with aluminosilicate between Ca/Mg and Na. The existence of Fe 2 O 3 can strongly inhibit the Na capture, which is probably caused by the fact that the structures of Na-[Fe-O-Si] and Na-[Fe-O-Al] pair are less stable than that of Na-[Si-O-Si] and Na-[Al-O-Si].

Probing the Structure-Property Relationships of Na+···Cl-@C50N5H5 under the External Electric Field.

Endohedral open-cage fullerenes are one of the attractive types of fullerenes due to their interesting electronic properties which make it potentially promising for applications in molecular electronics. In this paper, a novel structure of Na+···Cl-@C50N5H5 with Na+ inside the cavity and Cl- at the opening of the open-cage fullerene is designed to explore the chemical bonding and interaction between the open-cage fullerene system C50N5H5 and NaCl salt. Further, the directional migration of Na+ was achieved by applying an external electric field (EEF) along the X-axis. Notably, when the EEF ranges from -85 to -86 × 10-4 au, Na+ sharply approaches Cl- to regain its ionic bonding character. In addition, the Wiberg bond index, electron localization function topological analysis, and interaction energy (Eint) of the structure under the effect of the EEF also experienced a series of interesting changes. We hope that this work will provide a new strategy for the design of innovative materials for molecular electronics.

Formation of NaF‐Rich Solid Electrolyte Interphase on Na Anode through Additive‐Induced Anion‐Enriched Structure of Na+Solvation

AbstractHigh‐capacity sodium (Na) anodes suffer from dendrite growth due to the high reactivity, which can be overcome through inducing a stable NaF‐rich solid electrolyte interphase (SEI). Herein, we propose an additive strategy for realizing the anion‐enriched structure of Na+solvation to obtain a NaF‐rich SEI. The electron‐withdrawing acetyl group in 4‐acetylpyridine (4‐APD) increases the coordination number of PF6−in the Na+solvation sheath to facilitate PF6−to decompose into NaF. Thus, the NaF‐rich SEI with high mechanical stability and interfacial energy is formed to repress the growth of Na dendrites. With the 4‐APD‐contained electrolyte, the symmetric Na||Na cells show excellent cycling performance over 360 h at 1.0 mA cm−2. Meanwhile, excellent stability is also achieved for Na||Na3V2(PO4)2O2F full cells with high Coulombic efficiency (97 %) and capacity retention (91 %) after 200 cycles.

Synthesis and Performance Evaluation of Na(2‐x)LixFeP2O7 (x=0, 0.6) Hybrid Cathodes

AbstractThis study reports hybrid cathodes formation by cation substitution in which Li+ substitution has been considered for Na+ in the structure of Na(2‐x)LixFeP2O7 (x=0, 0.6) to form Na1.4Li0.6FeP2O7 cathodes. Na(2‐x)LixFeP2O7 (x=0, 0.6) cathodes were synthesized using the solid‐state synthesis technique and characterized by various methods. The structural analysis (XRD, FE‐SEM) indicates that the submicron‐sized, phase pure, and crystalline materials having irregular morphology have been developed. Moreover, Li+ substitution does not alter the triclinic parent structure of Na2FeP2O7. Thermogravimetric analysis (TGA) shows that Li+ substitution into Na2FeP2O7 improves its thermal stability up to 550 °C with only ∼5 % weight loss. The electrochemical performance of Na2FeP2O7 and Na1.4Li0.6FeP2O7 in both lithium (Li) and sodium (Na) half‐cells is investigated using different electrochemical techniques. It is noticed that Na1.4Li0.6FeP2O7 is electrochemically active both in lithium (Li) and sodium (Na) cells with promising cyclability. However, compared with Na2FeP2O7, Na1.4Li0.6FeP2O7 suffers from inferior electrochemical performance, which might be associated with the lattice distortion of Na2FeP2O7 due to Li+ substitution having a lower ionic radius than the Na+. Considering Na2FeP2O7 as a baseline material, a new hybrid Na1.4Li0.6FeP2O7 cathode has been developed, which can be used to synthesize other new cathode materials with improved performance.

Effect of Metal Cations on Corrosion Behavior and Surface Structure of Carbon Steel in Chloride Ion Atmosphere

In order to better understand why the corrosion behavior of carbon steel exposed in Nansha atmospheric environment is very serious, the effect of sodium, potassium and magnesium chlorides deposited on carbon steel surface has been studied under atmosphere conditions by wet/dry accelerated test. The difference of corrosion behavior and surface structure in Na+, K+, and Mg2+ containing atmosphere has been investigated by thickness loss, scanning electron microscope, X-ray diffraction and electrochemical techniques. The results indicate that the thickness loss of carbon steel exposed in different metal cations containing atmospheric environment increases in the order of Na+, K+, Mg2+. The hard metal cation can promote the dissolution of the steel to a certain extent. In Mg2+ containing atmosphere, the relative content of β-FeOOH is rather higher and the protective ability index α*/γ* decreases in the order of Na+, K+, Mg2+. The corrosion current density of both bare carbon steel and the rusted carbon steel increases in the order of Na+, K+, Mg2+. The polarization resistance and the charge transfer resistance decreases in the order of Na+, K+, Mg2+.

Structures of Na(3s)Xen and Na(3p)Xen with n = 1–12: Low energy isomers and absorption spectra

The structural properties of Na(3 s)Xen and Na(3p)Xen clusters are investigated using the pseudo-potential-approximation technique. To investigate these properties of the NaXen clusters, the basin-hopping global-optimization technique is employed to explore the potential-energy-surface. The obtained results show that the stablest structures for both ground and first excited states are significantly different. The sodium atom resides always at the surface of the xenon cluster for all the stable structures of the ground state. This fact is due to the weak bound of the Van der Waals interaction. Although for the first excited state, the small NaXen clusters favor the planar structures.The computed vertical Na(3s → 3p)Xen optical-transition illustrates that the spectral absorption depends on the structural/geometric properties and the electronic transitions associated with the absorption and emission of the studied molecules. The strong spectral-shift for NaXen clusters compared to that obtained for NaArn shows the size-effect of the rare gas atom.

Solvation structures of Na+ Cl− ion pair in DMF-water and DMF-methanol mixtures

ABSTRACT We have studied the solvation structures of Na+ Cl− ion pair in DMF (dimethyl formamide)-water and DMF-methanol binary mixtures using constrained molecular dynamics technique. The resulting potentials of mean force shows prominent minima corresponding to contact ion pairs (CIPs) and solvent assisted ion pairs (SAIPs) in all mole fractions of DMF except in pure DMF. The stabilities of CIPs increase with an increase in mole fraction of DMF in both the binary mixtures. The CIPs in DMF-methanol mixtures are more stable than the CIPs in DMF-water mixtures. The formation of the ion pair is found to be entropically driven in both the mixtures. Preferential solvation analysis through excess coordination numbers shows that Na+ and Cl− are preferentially solvated by water in DMF-water and by methanol in DMF-methanol binary mixtures. The rate of dissociation of the ion pair is larger in DMF-water mixtures than in DMF-methanol mixtures.

Synthesis and Crystal Structures of Alkali and Alkaline Earth Metal Complexes of 3,5‐Dinitropyrazolyl‐4‐carboxylate

The synthesis and crystal structures of 3,5‐dinitro‐1H‐pyrazolyl‐4‐carboxylic acid (H2dnpzc) and its four complexes with Ca2+, Ba2+, Na+ and K+ are reported in this paper. Ca(dnpzc)·5H2O exhibits a 1D polymeric structure, whereas Ba(dnpzc)·4H2O possesses a 2D structure. The structure of Na2(dnpzc)·4H2O consists of 2D layers of [Na(dnpzc)]–n and 1D chains of [Na(H2O)3]+n. K2(dnpzc)·H2O has a true 3D structure. It was observed that the doubly deprotonated ligand (dnpzc2–) can act as a versatile bridge to form polymeric structures by varying combinations of its 8 potential donor atoms (two carboxy O atoms, two pyrazolyl N atoms and four nitro O atoms). Particularly in the structure of K2(dnpzc)·H2O, all the 8 donor atoms of dnpzc2– take part in the coordination and as many as 10 potassium atoms are connected by one ligand.

Facile Preparation of Li0.44MnO₂ Nanorods and Their Enhanced Electrochemical Lithium Storage Performance.

In this paper, we present a fast and green method to prepare Li0.44MnO₂ nanorods by Li/Na ion exchange of Na0.44MnO₂ templates. XRD and SEM confirm that the products still maintain the crystal and geometric structure of Na0.44MnO₂ temples. Electrochemical tests show the capacity of Li0.44MnO₂ nanorods is up to 218 mAh · g-1 at the current density of 0.1 A · g-1. Especially, the capacity of electrode is still located at 90 mAh · g-1 at the current density of 5.0 A· g-1 after cycling for 100 times. So Li0.44MnO₂ nanorods have a potential application in the next generation of advanced batteries.

Role of Bridging Na+ Cations in the Packing of Na2[Pd(NH3)4]5(W7O24)2·16H2O and Na[Pd(NH3)4]2(HW7O24)·7H2O Structures

Two complex salts with heptatungstate anions and [Pd(NH3)4]2+ and Na+ cations are synthesized. In the structure of Na2[Pd(NH3)]5(W7O24)2·16H2O (a = 11.5703(3) A, b = 12.4653(4) A, c = 14.8201(5) A, α = 69.733(1)°, β = 97.231(1)°, γ = 75.816(1)°, space group P-1, V = 1937.8(1) A3, Z = 1), the Na+ cations link heptatungstate anions into dimers; the Na…O distances are 2.321–2.446 A. In the structure of Na[Pd(NH3)4]2(HW7O24)·7H2O (a = 11.1113(8) A, b = 17.9869(12) A, c = 17.8140(13) A, β = 96.974(2)°, space group P21/n, V = 3533.9(4) A3, Z = 4), the bridging Na+ cations link hydroheptatungstate anions into zigzag chains; the Na…O distances are 2.291–2.724 A.

Characterization, molecular modeling and phylogenetic analysis of a long mammalian neurotoxin from the venom of the Iranian scorpion Androctonus crassicauda

Scorpion venoms are highly complex polypeptides with a wide spectrum of bioactivities. A long chain peptide with eight cysteine residues and four disulfide bonds isolated from the venom of the Iranian scorpion Androctonus crassicauda, a dangerously venomous species belongs to the Buthidae family. Toxin was purified using size exclusion and reverse phase chromatography and was characterized by molecular weight determination and amino acid sequence. The primary structure analysis shows that AnCra1 is a long peptide with 64 amino acid residues and 7255.23 Da. as molecular weight. This toxic peptide, causing severe paralysis and leading to dead. It shows highest homology with voltage-gated sodium channel alpha toxins isolated from Middle-East and North-Africa scorpions. Phylogenetic relationship of AnCra1 and other ion channel toxins from Buthidae family suggested that, separation between these families of scorpions caused by the geographical conditions led to evolutionary alterations in these venoms polypeptide sequences. Homology modeling and three-dimensional structure of AnCra1 indicated that binding residues on exposed part of the peptide have high affinity for receptor residues in Na+V ion channel, site-3. The contact surfaces characteristics and charges may be eventuate to interaction between toxin peptide and targeted channel. Molecular homology between AnCra1 with structure of Na+V neurotoxic peptides illustrated that, AnCra1 can act as novel functional putative Alpha-mammal voltage-gated sodium channel toxin.

Real-time Monitoring Excitation Dynamics of Human Telomeric Guanine Quadruplexes: Effect of Folding Topology, Metal Cation, and Confinement by Nanocavity Water Pool.

Guanine(G)-rich human telomeric (HT) DNA repeats, crucial to maintenance of genome stability, readily form G-quadruplexes (GQs) with various folding topologies. Research on excitation dynamics of HT-GQs is, however, scarce. Herein, we report a femtosecond time-resolved fluorescence coupled with transient absorption investigation on HT-GQ with the basket-type structure in Na+ solution. The result unveils an unusual multichannel nonradiative mechanism dominated by states with varying character of charge transfer lasting ten and hundreds of picoseconds, accounting altogether for an overwhelming ∼85% of the overall deactivation involving proton transfer. Our comparative study shows that encapsulating the GQ in nanocavity water pool or changing it into hydrid-type topologies with the presence of K+ ions alter differently energies and lifetimes of these states, yet without affecting the nature of the electronic excitation involved. The finding of this work underscores a leading role of structural rigidity in regulating the interplay with the microenvironment of photoexcited monomolecularly folded HT-GQs.