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Komal Patil(코말 파틸),Jin Hyeok Kim(김진혁) 한국신재생에너지학회 2021 한국신재생에너지학회 학술대회논문집 Vol.2021 No.7
The electrochemical urea oxidation reaction (UOR) is useful for the simultaneous elimination of urea-rich wastewater and generation of hydrogen. In this work, we demonstrated the synthesis of NiCoFe-LDH nanosheets supported on 3D Ni foam substrates by one step hydrothermal method. Benefiting from the synergism of compositional and structural merits, the resultant self-supported NiCoFe-LDH/NF composite exhibited excellent electrocatalytic performance for UOR. Significant enhancement of electrocatalytic activity of NiCoFe-LDH/NF was witnessed because of the doped Fe. Compared with the parent NiCoFe-LDH/NF, the optimized NiCoFe-LDH/NF exhibited a lower potential of 1.337 V at 25 mA cm<sup>-2</sup> with a smaller Tafel slope of 43 mv dec-1 in 1 M KOH containing 0.33 M urea.
Rational Design of Binder-Free Fe-Doped CuCo(OH)2 Nanosheets for High-Performance Water Oxidation
Komal Patil,장수영,김진혁 한국재료학회 2022 한국재료학회지 Vol.32 No.5
Designing and producing a low-cost, high-current-density electrode with good electrocatalytic activity for the oxygen evolution reaction (OER) is still a major challenge for the industrial hydrogen energy economy. In this study, nanostructured Fe-doped CuCo(OH)2 was discovered to be a precedent electrocatalyst for OER with low overpotential, low Tafel slope, good durability, and high electrochemically active surface sites at reduced mass loadings. Fe-doped CuCo(OH)2 nanosheets are made using a hydrothermal synthesis process. These nanosheets are clumped together to form a highly open hierarchical structure. When used as an electrocatalyst, the Fe-doped CuCo(OH)2 nanosheets required an overpotential of 260 mV to reach a current density of 50 mA cm−2. Also, it showed a small Tafel slope of 72.9 mV dec−1, and superior stability while catalyzing the generation of O2 continuously for 20 hours. The Fe-doped CuCo(OH)2 was found to have a large number of active sites which provide hierarchical and stable transfer routes for both electrolyte ions and electrons, resulting in exceptional OER performance.
Komal N. Patil,Divya Prasad,Vilas K. Manoorkar,Jayesh T. Bhanushali,Arvind H. Jadhav,Bhari Mallanna Nagaraja 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.106 No.-
Production of c-butyrolactone (GBL) from vapour-phase dehydrocyclization of biomass derived 1,4-butanediol is considered as more sustainable and significantly commercial industrial process. In thisregards, Cu-based catalyst was designed with ZnAl2O4 spinel support and CeO2 as a promoter to obtainCu/ZnAl2O4-CeO2 catalyst with different Cu:Ce mass ratio. The catalysts were characterized by XRD,H2-TPR, FT-IR, CO2-TPD, FE-SEM and BET analysis and then tested for the production of cbutyrolactone(GBL) by dehydrocyclization of 1,4-butanediol (BDO). Further, various reaction parameterswere optimized and their effects on the catalytic activity were studied to obtain maximum yield towardsdesired product at ambient reaction conditions. The results revealed that metallic Cu species and CeO2 asa promoter were highly dispersed on ZnAl2O4 support with appreciable surface area. Additionally, CeO2as a promoter prevented agglomeration, increased the basic character of catalyst to selectively obtain GBLas a major product. 10 wt% Cu/ZnAl2O4-10 wt% CeO2 catalyst exhibited excellent yield (94%) towards GBLproduct with tetrahydrofuran (THF) as the only by-product and demonstrated consistent activity andselectivity during 26 h time on stream. Further, the optimized catalyst displayed appreciable recyclabilityperformance up to seven recycles without much loss in its catalytic performance making the catalyst feasibleat industrial scale.
Patil, Komal,Babar, Pravin,Kim, Jin Hyeok Materials Research Society of Korea 2020 한국재료학회지 Vol.30 No.5
The design and fabrication of catalysts with low-cost and high electrocatalytic activity for the oxygen evolution reaction (OER) have remained challenging because of the sluggish kinetics of this reaction. The key to the pursuit of efficient electrocatalysts is to design them with high surface area and more active sites. In this work, we have successfully synthesized a highly stable and active NiCo<sub>2</sub>S<sub>4</sub> nanowire array on a Ni-foam substrate (NiCo<sub>2</sub>S<sub>4</sub> NW/NF) via a two-step hydrothermal synthesis approach. This NiCo<sub>2</sub>S<sub>4</sub> NW/NF exhibits overpotential as low as 275 mV, delivering a current density of 20 mA cm<sup>-2</sup> (versus reversible hydrogen electrode) with a low Tafel slope of 89 mV dec<sup>-1</sup> and superior long-term stability for 20 h in 1 M KOH electrolyte. The outstanding performance is ascribed to the inherent activity of the binder-free deposited, vertically aligned nanowire structure, which provides a large number of electrochemically active surface sites, accelerating electron transfer, and simultaneously enhancing the diffusion of electrolyte.