Autor: Sundriyal, Shashank

Skocz do pozycji: 1.

Tytuł:: Diffusion and surface charge studies of waste cow dung derived highly porous carbon as a facile electrode for solid-state supercapacitors
Autorzy:: Hołdyński, Marcin
Dubey, Prashant
Nogala, Wojciech
Shrivastav, Vishal
Sundriyal, Shashank
Gupta, Bhavana
Wydawca:: Elsevier
Cytata wydawnicza:: Diamond & Related Materials 130 (2022) 109529. https://doi.org/10.1016/j.diamond.2022.109529
Opis:: Carbon-based materials generated from biowaste have recently attracted interest due to their exceptional surface and conductive properties. Cow dung derived porous carbon (CDPC) with a 3D structure and linked pores is synthesized in this study, making it an alternative electrode for supercapacitors (SC). Herein, we studied the diffusion and surface charge contribution and their relationship with the scan rate. Diffusion charge contribution is more prevalent at lower scan rates. Furthermore, a large fraction of surface charge contribution of 69.2 % at a high scan rate of 100 mV/s indicates rapid electrochemical kinetics and hence high-rate performance even at higher current densities. In addition, utilizing a 1 M H2SO4 electrolyte, the CDPC electrode has attained a high specific capacitance value of 210 F/g at 0.5 A/g. Furthermore, symmetrical solid-state SC device displayed high energy density of 36 Wh/kg at good power density of 800 W/kg along with remarkable cyclic stability of 92.6 % after 10,000 charge-discharge cycles. Hence, these findings demonstrate that investigating surface and diffusion charge contributions opens up new avenues for tuning the supercapacitor performance.
European Union, Ministry of Science and Higher Education
Dostawca treści:: Repozytorium Centrum Otwartej Nauki

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Skocz do pozycji: 2.

Tytuł:: Evaluation of local oxygen flux produced by photoelectrochemical hydroxide oxidation by scanning electrochemical microscopy
Autorzy:: Shrivastav, Vishal
Nogala, Wojciech
Sundriyal, Shashank
Aziz, Ariba
Holdynski, Marcin
Melvin, Ambrose A.
Gupta, Bhavana
Wydawca:: Springer Nature Limited
Cytata wydawnicza:: Gupta, B., Aziz, A., Sundriyal, S. et al. Evaluation of local oxygen flux produced by photoelectrochemical hydroxide oxidation by scanning electrochemical microscopy. Sci Rep 13, 5019 (2023). https://doi.org/10.1038/s41598-023-32210-6
Opis:: Several in-situ electrochemical approaches have been developed for performing a localized photoelectrochemical investigation of the photoanode. One of the techniques is scanning electrochemical microscopy (SECM), which probes local heterogeneous reaction kinetics and fluxes of generated species. In traditional SECM analysis of photocatalysts, evaluation of the influence of radiation on the rate of studied reaction requires an additional dark background experiment. Here, using SECM and an inverted optical microscope, we demonstrate the determination of O2 flux caused by light-driven photoelectrocatalytic water splitting. Photocatalytic signal and dark background are recorded in a single SECM image. We used an indium tin oxide electrode modified with hematite (α-Fe2O3) by electrodeposition as a model sample. The light-driven flux of oxygen is calculated by analysis of SECM image recorded in substrate generation/tip collection mode. In photoelectrochemistry, the qualitative and quantitative knowledge of oxygen evolution will open new doors for understanding the local effects of dopants and hole scavengers in a straightforward and conventional manner.
Dostawca treści:: Repozytorium Centrum Otwartej Nauki

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Skocz do pozycji: 3.

Tytuł:: Recent advances on surface mounted metal-organic frameworks for energy storage and conversion applications: Trends, challenges, and opportunities
Autorzy:: Dubey, Prashant
Nogala, Wojciech
Shrivastav, Vishal
Mansi
Shrivastav, Vaishali
Sundriyal, Shashank
Deep, Akash
Gupta, Bhavana
Wydawca:: Elsevier
Cytata wydawnicza:: Shrivastav, V., Mansi, Gupta, B., Dubey, P., Deep, A., Nogala, W., Shrivastav, V., & Sundriyal, S. (2023). Recent advances on surface mounted metal-organic frameworks for energy storage and conversion applications: Trends, challenges, and opportunities. In Advances in Colloid and Interface Science (Vol. 318, p. 102967). Elsevier BV. https://doi.org/10.1016/j.cis.2023.102967
Opis:: Establishing green and reliable energy resources is very important to counteract the carbon footprints and negative impact of non-renewable energy resources. Metal-organic frameworks (MOFs) are a class of porous material finding numerous applications due to their exceptional qualities, such as high surface area, low density, superior structural flexibility, and stability. Recently, increased attention has been paid to surface mounted MOFs (SURMOFs), which is nothing but thin film of MOF, as a new category in nanotechnology having unique properties compared to bulk MOFs. With the advancement of material growth and synthesis technologies, the fine tunability of film thickness, consistency, size, and geometry with a wide range of MOF complexes is possible. In this review, we recapitulate various synthesis approaches of SURMOFs including epitaxial synthesis approach, direct solvothermal method, Langmuir-Blodgett LBL deposition, Inkjet printing technique and others and then correlated the synthesis-structure-property relationship in terms of energy storage and conversion applications. Further the critical assessment and current problems of SURMOFs have been briefly discussed to explore the future opportunities in SURMOFs for energy storage and conversion applications.
Dostawca treści:: Repozytorium Centrum Otwartej Nauki

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Skocz do pozycji: 4.

Tytuł:: Copper foam supported g‑C3N4‑metal–organic framework bacteria biohybrid cathode catalyst for CO2 reduction in microbial electrosynthesis
Autorzy:: Shrivastav, Vishal
Nogala, Wojciech
Min, Booki
Mansi
Sundriyal, Shashank
Tiwari, Umesh K.
Holdynski, Marcin
Noori, Md Tabish
Giri, Balendu Sekhar
Gupta, Bhavana
Wydawca:: Springer Science and Business Media LLC
Cytata wydawnicza:: Noori, M.T., Mansi, Sundriyal, S. et al. Copper foam supported g-C3N4-metal–organic framework bacteria biohybrid cathode catalyst for CO2 reduction in microbial electrosynthesis. Sci Rep 13, 22741 (2023). https://doi.org/10.1038/s41598-023-49246-3 https://doi.org/10.1038/s41598-023-49246-3
Opis:: Microbial electrosynthesis (MES) presents a versatile approach for efficiently converting carbon dioxide (CO2) into valuable products. However, poor electron uptake by the microorganisms from the cathode severely limits the performance of MES. In this study, a graphitic carbon nitride (g-C3N4)-metal–organic framework (MOF) i.e. HKUST-1 composite was newly designed and synthesized as the cathode catalyst for MES operations. The physiochemical analysis such as X-ray diffraction, scanning electron microscopy (SEM), and X-ray fluorescence spectroscopy showed the successful synthesis of g-C3N4-HKUST-1, whereas electrochemical assessments revealed its enhanced kinetics for redox reactions. The g-C3N4-HKUST-1 composite displayed excellent biocompatibility to develop electroactive biohybrid catalyst for CO2 reduction. The MES with g-C3N4-HKUST-1 biohybrid demonstrated an excellent current uptake of 1.7 mA/cm2, which was noted higher as compared to the MES using g-C3N4 biohybrid (1.1 mA/cm2). Both the MESs could convert CO2 into acetic and isobutyric acid with a significantly higher yield of 0.46 g/L.d and 0.14 g/L.d respectively in MES with g-C3N4-HKUST-1 biohybrid and 0.27 g/L.d and 0.06 g/L.d, respectively in MES with g-C3N4 biohybrid. The findings of this study suggest that g-C3N4-HKUST-1 is a highly efficient catalytic material for biocathodes in MESs to significantly enhance the CO2 conversion.
Dostawca treści:: Repozytorium Centrum Otwartej Nauki

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