Sirshendu Dinda

Helmholtz-Institut Ulm | KIT-HIU · Materials Research Area

The advancement of microelectronic devices mandates the development of flexible energy storage systems to enable the fabrication of miniaturized and wearable electronics. Herein, a sustainable approach is demonstrated for tuning the electronic and electrochemical properties of hierarchically porous laser‐induced graphene (LIG) substrates. The metho...

Layered oxides constitute one of the most promising cathode materials classes for large-scale sodium-ion batteries because of their high specific capacity, scalable synthesis, and low cost. However, their practical use is limited by their low energy density, physicochemical instability, and poor cycling stability. Aiming to mitigate these shortcomi...

The development of competitive rechargeable Mg batteries is hindered by the poor mobility of divalent Mg ions in cathode host materials. In this work, we explore the dual cation co-intercalation strategy to mitigate the sluggishness of Mg²⁺ in model TiS2 material. The strategy involves pairing Mg²⁺ with Li⁺ or Na⁺ in dual-salt electrolytes in order...

State-of-the-art lithium-ion anodes based on graphite exhibits high specific capacity and a low de-/lithiation potential, thus, enabling very high energy densities at full-cell level. However, the rather sluggish lithiation kinetics render them less suitable for fast-charging batteries [1] . A potential alternative that has gathered increasing inte...

Inorganic aqueous binders (IAB) are an emerging class of aqueous binders. They offer exceptional physico-chemical properties like intrinsic ionic conductivity, high thermal stability (>1000 • C), and environmental benignity making them attractive. In a previous study, we found that graphite anode shows improved electro-chemical performance with the...

A prime challenge in the development of new battery chemistries is the fundamental understanding of the generation of the electrode–electrolyte interface (EEI) and its evolution upon cycling. Tip‐enhanced Raman spectroscopy (TERS) under an inert gas atmosphere is employed to study the chemical components of the anode/cathode electrolyte interface i...

The development of commercially viable fuel cells and metal‐air batteries requires effective and cheap bifunctional catalysts for the oxygen reduction reaction (ORR) and the oxygen evolution reaction (OER). Multi‐component Pt−Fe−Co−Ni nanoparticles on multi‐walled carbon nanotubes (MWCNTs) were synthesized by wet chemistry route via NaBH4 reduction...

Multivalent batteries show promising prospects for next‐generation sustainable energy storage applications. Herein, we report a polytriphenylamine (PTPAn) composite cathode capable of highly reversible storage of tetrakis(hexafluoroisopropyloxy) borate [B(hfip)4] anions in both Magnesium (Mg) and calcium (Ca) battery systems. Spectroscopic and comp...

Graphical Abstract

Supporting Information

Upon cycling, Li‐rich Mn‐based disordered rocksalt (DRS) oxyfluoride cathode materials undergo unwanted degradation processes, which are triggered by chemical side reactions or irreversible oxygen redox activity, especially at high voltages and in contact with the electrolyte. A surface coating can be an effective strategy to mitigate these parasit...

Multivalent batteries show promising prospects for next‐generation sustainable energy storage applications. Herein, we report a polytriphenylamine (PTPAn) composite cathode capable of highly reversible storage of tetrakis(hexafluoroisopropyloxy) borate [B(hfip)4] anions in both Magnesium (Mg) and calcium (Ca) battery systems. Spectroscopic and comp...

Cation-disordered rock salt (DRS) materials have been reported as cathode candidates for Li-ion batteries. They have shown good initial capacity and reversibility; however, they usually suffer from short cycle life [1]. In order to overcome this issue, in this study we combined the strategy of using high-valent cations with partial substitution of...

The file for Supporting Information

Recent studies have shown that disordered rock salt (DRS) oxyfluorides with Li excess are interesting candidates as cathode materials for Li-ion batteries. However, these materials have not been able to achieve the desired technological level yet owing to structure stability issues and the lack of direct evidence of the underlying Li + (de)insertio...

In aqueous magnesium air batteries, the influence of the electrochemical behavior on pH of the electrolyte has not been investigated yet which have a critical effect on the cell performance. We have monitored in‐situ, the evolution of the pH at various discharge current densities in the Mg‐air primary cells which produce sparingly soluble magnesium...

The impact of urea on the microheterogeneous nature of (acetamide+LiNO3) DESs was investigated via following the viscosity coupling of the average timescales of solute rotation, solvation and cis-trans isomerization reaction occurring in such media. Picosecond resolved fluorescence measurements were carried out to access these average relaxation ti...

The impact of urea on the microheterogeneous nature of acetamide+LiNO3 deep eutectic solvents (DESs) was investigated via following the viscosity coupling of the average timescales of solute rotation, solvation and cis-trans isomerization reaction occurring in such media. Picosecond resolved fluorescence measurements were carried out to access thes...

Optical tweezers work on the principle that microscopic particles may be immobilized by the application of an intense photon flux, which may be attained under tight focusing conditions. To elucidate the behaviour and mechanism of this tweezing action, herein we perform numerical studies and investigate the intensity distribution at the focusing spo...

We have shown experimentally the successful engineering of femtosecond pulse shaping at a 76 MHz repetition rate input pulse with an acousto-optic modulator (AOM). High repetition rate (HRR) femtosecond laser pulse shaping using an AOM in the Fourier plane was incomprehensible because of its intrinsic 100 kHz acoustic update limit. We demonstrate a...

We illustrate control of a polarized laser optical trapping potential landscape through the nonideal mixing of binary liquids. The inherent trapping potential asymmetry (ITPA) present in the trapping region results from the asymmetric intensity distribution in focal volume due to the high numerical aperture objective lens. Experimentally, we show t...

Using the close-aperture Z-scan technique, the pure nonlinear refractive index ( n 2 ) of carbon disulfide is measured with a 76 MHz repetition rate femtosecond laser. Strong interference of thermal effects exists with high-repetition-rate lasers that result in negative values of n 2 . We remove the thermal effect completely by continuously increas...

We report structured interferometric features in femtosecond supercontinuum generation (FSG) with incident laser powers that are near threshold for FSG. We argue that near threshold, these structures arise from the coherent superposition of pulses that are split initially into two daughter pulses during FSG process. Increase in the input pulse ener...

We use a femtosecond pump-probe Z-scan technique to measure the thermal lens (TL) signal in a homologous series of primary alcohols. The trend in these experimentally measured TL signals deviates in a counterintuitive manner from the ones calculated using theoretical models that are only based on the macroscopic parameters. Introspection shows that...

We explore the importance of molecular structure on thermal lens (TL) spectroscopy by measuring the effects of molecular isomerization on TL measurements. In particular, we present a case study for all the structural isomers of butanol, namely, normal-butanol (n-BuOH), secondary-butanol (s-BuOH), iso-butanol (i-BuOH) and tertiary-butanol (t-BuOH)....