ORCID Profile
0000-0003-2240-798X
Current Organisation
University of South Carolina
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Publisher: Wiley
Date: 23-08-2022
Abstract: To mitigate flooding associated with the gas diffusion layer (GDL) during electroreduction of CO 2 , we report a hydrophobicity‐graded hydrophobic GDL (HGGDL). Coating uniformly dispersed polytetrafluoroethylene (PTFE) binders on the carbon fiber skeleton of a hydrophilic GDL uniformizes the hydrophobicity of the GDL and also alleviates the gas blockage of pore channels. Further adherence of the PTFE macroporous layer (PMPL) to one side of the hydrophobic carbon fiber skeleton was aided by sintering. The introduced PMPL shows an appropriate pore size and enhanced hydrophobicity. As a result, the HGGDL offers spatial control of the hydrophobicity and hence water and gas transport over the GDL. Using a nickel‐single‐atom catalyst, the resulting HGGDL electrode provided a CO faradaic efficiency of over 83 % at a constant current density of 75 mA cm −2 for 103 h operation in a membrane electrode assembly, which is more than 16 times that achieved with a commercial GDL.
Publisher: Wiley
Date: 23-08-2022
Abstract: To mitigate flooding associated with the gas diffusion layer (GDL) during electroreduction of CO 2 , we report a hydrophobicity‐graded hydrophobic GDL (HGGDL). Coating uniformly dispersed polytetrafluoroethylene (PTFE) binders on the carbon fiber skeleton of a hydrophilic GDL uniformizes the hydrophobicity of the GDL and also alleviates the gas blockage of pore channels. Further adherence of the PTFE macroporous layer (PMPL) to one side of the hydrophobic carbon fiber skeleton was aided by sintering. The introduced PMPL shows an appropriate pore size and enhanced hydrophobicity. As a result, the HGGDL offers spatial control of the hydrophobicity and hence water and gas transport over the GDL. Using a nickel‐single‐atom catalyst, the resulting HGGDL electrode provided a CO faradaic efficiency of over 83 % at a constant current density of 75 mA cm −2 for 103 h operation in a membrane electrode assembly, which is more than 16 times that achieved with a commercial GDL.
Publisher: Ovid Technologies (Wolters Kluwer Health)
Date: 27-09-2017
DOI: 10.1212/WNL.0000000000004560
Abstract: To determine whether common variants in familial cerebral small vessel disease (SVD) genes confer risk of sporadic cerebral SVD. We meta-analyzed genotype data from in iduals of European ancestry to determine associations of common single nucleotide polymorphisms (SNPs) in 6 familial cerebral SVD genes ( COL4A1 , COL4A2 , NOTCH3 , HTRA1 , TREX1 , and CECR1 ) with intracerebral hemorrhage (ICH) (deep, lobar, all 1,878 cases, 2,830 controls) and ischemic stroke (IS) (lacunar, cardioembolic, large vessel disease, all 19,569 cases, 37,853 controls). We applied data quality filters and set statistical significance thresholds accounting for linkage disequilibrium and multiple testing. A locus in COL4A2 was associated (significance threshold p 3.5 × 10 −4 ) with both lacunar IS (lead SNP rs9515201: odds ratio [OR] 1.17, 95% confidence interval [CI] 1.11–1.24, p = 6.62 × 10 −8 ) and deep ICH (lead SNP rs4771674: OR 1.28, 95% CI 1.13–1.44, p = 5.76 × 10 −5 ). A SNP in HTRA1 was associated (significance threshold p 5.5 × 10 −4 ) with lacunar IS (rs79043147: OR 1.23, 95% CI 1.10–1.37, p = 1.90 × 10 −4 ) and less robustly with deep ICH. There was no clear evidence for association of common variants in either COL4A2 or HTRA1 with non-SVD strokes or in any of the other genes with any stroke phenotype. These results provide evidence of shared genetic determinants and suggest common pathophysiologic mechanisms of distinct ischemic and hemorrhagic cerebral SVD stroke phenotypes, offering new insights into the causal mechanisms of cerebral SVD.
Publisher: AMG Transcend Association
Date: 30-01-2021
DOI: 10.33263/BRIAC115.1254712559
Abstract: Green chemical approaches for the production of nanomaterials are currently attracted to research and industry development to minimize the use of hazardous chemicals and reduce industrial pollution. A green reagent Ocimum sanctum leaf extract was used to synthesize doped and undoped CdS nanoparticles in this work. The as-synthesized nanoparticles were characterized by using different characterization techniques such as UV-Vis spectroscopy, XRD, and TEM. The effect of doping on physicochemical properties was analyzed. Photocatalytic properties of these nanoparticles were investigated by sunlight-based photodegradation studies of methylene blue dye. The doping of these green synthesized CdS nanoparticles with heavy metals has improved photocatalytic efficiency over a given time.
Publisher: Elsevier BV
Date: 08-2023
Publisher: Springer Science and Business Media LLC
Date: 04-2021
Publisher: American Chemical Society (ACS)
Date: 19-06-2019
Publisher: Wiley
Date: 21-03-2015
DOI: 10.1002/PI.4881
Publisher: Wiley
Date: 16-06-2021
Abstract: The development of Cu‐based catalysts for the electrochemical CO 2 reduction reaction (eCO 2 RR) is of major interest for generating commercially important C 2 liquid products such as ethanol. Cu is exclusive among the eCO 2 RR metallic catalysts in that it facilitates the formation of a range of highly reduced C 2 products, with a reasonable total faradaic efficiency but poor product selectivity. Here, a series of new sulfide‐derived copper‐cadmium catalysts (SD‐Cu x Cd y ) was developed. An excellent faradaic efficiency of around 32 % but with a relatively low current density of 0.6 mA cm −2 for ethanol was obtained using the SD‐CuCd 2 catalyst at the relatively low overpotential of 0.89 V in a CO 2 ‐saturated aqueous 0.10 m KHCO 3 solution with an H‐cell. The current density increased by an order of magnitude under similar conditions using a flow cell where the mass transport rate for CO 2 was greatly enhanced. Ex situ spectroscopic and microscopic, and voltammetric investigations pointed to the role of abundant phase boundaries between CdS and Cu + /Cu sites in the SD‐CuCd 2 catalyst in enhancing the selectivity and efficiency of ethanol formation at low potentials.
Publisher: Royal Society of Chemistry (RSC)
Date: 2022
DOI: 10.1039/D2NR03539A
Abstract: Alloying is efficient for tuning product selectivity of copper in electrochemical reduction of CO 2 . Different alloying strategies and their impacts on product formation paths, the key challenges and future directions of the field have been reviewed.
Publisher: Springer Science and Business Media LLC
Date: 13-02-2023
Publisher: American Scientific Publishers
Date: 12-2017
Publisher: American Chemical Society (ACS)
Date: 10-11-2019
Publisher: Wiley
Date: 03-02-2022
Abstract: Herein, we report a series of CuPd catalysts for electrochemical hydrogenation (ECH) of furfural to 2‐methylfuran (MF or FurCH 3 where Fur=furyl) in aqueous 0.1 M acetic acid (pH 2.9). The highest faradaic efficiency (FE) for MF reached 75 % at −0.58 V vs. reversible hydrogen electrode with an average partial current density of 4.5 mA cm −2 . In situ surface‐enhanced Raman spectroscopic and kinetic isotopic experiments suggested that electrogenerated adsorbed hydrogen (H ads ) was involved in the reaction and incorporation of Pd enhanced the surface coverage of H ads and optimized the adsorption pattern of furfural, leading to a higher FE for MF. Density functional theory calculations revealed that Pd incorporation reduced the energy barrier for the hydrogenation of FurCH 2 * to FurCH 3 *. Our study demonstrates that catalyst surface structure/composition plays a crucial role in determining the selectivity in ECH and provides a new strategy for designing advanced catalysts for ECH of bio‐derived oxygenates.
Publisher: Wiley
Date: 02-2022
Abstract: Pd is an attractive electrocatalyst for the conversion of CO 2 to CO. Herein, we report the synthesis of ultrathin Pd nanosheets with a (111) exposed facet which enables CO evolution to be achieved in a CO 2 saturated 0.1 m KHCO 3 solution in a conventional H‐cell with a faradaic efficiency of 74±4 % at −0.75 V vs RHE and a partial current density (calculated based on the geometric area) of −0.65 mA cm −2 . Further, to reduce the cost, Cu was introduced into the Pd nanosheets to form Cu x Pd y bimetallic alloy nanosheets with (111) exposed planes. The composition of the Cu x Pd y alloy played a significant role in determining the nature of the nanosheet structure and the product selectivity. When 50 % of the Pd was replaced by Cu, competitive CO evolution could still be achieved relative to use of purely Pd nanosheets with 57±5 % of CO achieved at −0.85 V vs RHE and a partial current density of −0.9 mA cm −2 . Under flow‐cell conditions with a higher CO 2 mass transport rate, CuPd nanosheets exhibited enhanced current densities in the range of −5 mA cm −2 to −35 mA cm −2 but with a negligible change in faradaic efficiencies irrespective of the applied potential in a 1.0 m KHCO 3 medium. The use of a 1.0 m KOH solution further improved the catalytic performance generating 71±3 % of CO with a partial current density of −58±2 mA cm −2 at a low potential of −0.6 V vs RHE. Post electrolysis characterization revealed structural transformations occurred during electrolysis that impacted the product selectivity of some catalysts.
Location: India
No related grants have been discovered for Venkata Sai Sriram Mosali.