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Simple, ultra-rapid, versatile method to synthesize cobalt/cobalt oxide nanostructures on carbon fiber paper via intense pulsed white light (IPWL) photothermal reduction for energy storage applications

Lee, Sanghyun,Park, Sung-Hyeon,Jang, Kihun,Yu, Seongil,Song, Chiho,Kim, Hak-Sung,Ahn, Heejoon Elsevier 2017 JOURNAL OF ALLOYS AND COMPOUNDS Vol.724 No.-
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Abstract Cobalt-based nanomaterials have received considerable attention in electric energy-storage devices due to their outstanding electrochemical characteristics. However, multiple time- and energy-consuming steps and complex reduction processes for producing cobalt and cobalt oxide nanostructures are disrupting their substantive commercialization. Here, we propose a facile, ultra-fast, and versatile method for the fabrication of cobalt and cobalt oxide nanostructures using an intense pulsed white light (IPWL) photothermal reduction technique. The mechanism of the IPWL photothermal reduction of cobalt and cobalt oxide is firstly studied by measuring the in-situ temperature of the Co(NO3)2-coated carbon fiber paper (CFP) substrate during IPWL irradiation and analyzing the crystal structures of the IPWL-irradiated samples. Cobalt nanoflakes and cobalt oxide nanoparticles are synthesized on the surface of the CFP substrate by irradiating IPWL for 10 ms at ambient temperature and pressure with various energy densities from 10 to 30 J cm−2. The Co3O4 nanoparticle/CFP and Co nanoflake/CFP samples are further utilized as an electrode, and each electrode exhibits high specific capacity of 29 and 73 mA h g−1, respectively, at a current density of 1 A g−1. Since this novel photothermal reduction technique is applicable to other transition metals and metal oxides, it is a promising method for not only energy storage systems, but also for energy generation applications, filters, sensors, and catalysis systems. Highlights <UL> <LI> Facile, ultra-fast, versatile IPWL photothermal reduction technique is proposed. </LI> <LI> Co nanoflakes and cobalt oxide nanoparticles are fabricate on CFP by IPWL. </LI> <LI> The mechanism of the IPWL photothermal reduction of cobalt/cobalt oxide is studied. </LI> </UL> Graphical abstract The intense pulsed white light (IPWL) photothermal reduction process enables ultra-rapid and facile synthesis of cobalt nanoflakes and cobalt oxide nanoparticles on carbon fiber paper (CFP). The IPWL-induced Co3O4 nanoparticle/CFP and Co nanoflake/CFP electrodes exhibit high specific capacity, as well as excellent rate capability and cycle stability. [DISPLAY OMISSION]
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Improved Hydrolysis of Organophosphorus Compounds by Engineered Human Prolidases

Yun, Hyeongseok,Lee, Sungrae,Kim, Sumi,Yu, Jiyeon,Lee, Nari,Lee, Jinhee,Kim, Nam Doo,Yu, Chiho,Rho, Jaerang Bentham Science 2017 Protein and peptide letters Vol.24 No.7
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Conclusion: We report here that by introducing either the A252R or P365R substitution mutation, the structural changes affecting catalytic turnover rate and substrate binding affinity are valuable in improving the catalytic activity of human prolidase towards toxic organophosphorus compound hydrolysis.
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Engineered Recombinant PON1-OPH Fusion Hybrids: Potentially Effective Catalytic Bioscavengers against Organophosphorus Nerve Agent Analogs

( Nari Lee ),( Hyeongseok Yun ),( Chan Lee ),( Yikjae Lee ),( Euna Kim ),( Sumi Kim ),( Hyoeun Jeon ),( Chiho Yu ),( Jaerang Rho ) 한국미생물생명공학회(구 한국산업미생물학회) 2021 Journal of microbiology and biotechnology Vol.31 No.1
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Organophosphorus nerve agents (OPNAs), including both G- and V-type nerve agents such as sarin, soman, tabun and VX, are extremely neurotoxic organophosphorus compounds. Catalytic bioscavengers capable of hydrolyzing OPNAs are under development because of the low protective effects and adverse side effects of chemical antidotes to OPNA poisoning. However, these bioscavengers have certain limitations for practical application, including low catalytic activity and narrow specificity. In this study, we generated a fusion-hybrid form of engineered recombinant human paraoxonase 1 (rePON1) and bacterial organophosphorus hydrolase (OPH), referred to as GV-hybrids, using a flexible linker to develop more promising catalytic bioscavengers against a broad range of OPNAs. These GV-hybrids were able to synergistically hydrolyze both G-type OPNA analogs (paraoxon: 1.7 ~ 193.7-fold, p-nitrophenyl diphenyl phosphate (PNPDPP): 2.3 ~ 33.0-fold and diisopropyl fluorophosphates (DFP): 1.4 ~ 22.8-fold) and V-type OPNA analogs (demeton-S-methyl (DSM): 1.9 ~ 34.6-fold and malathion: 1.1 ~ 4.2-fold above) better than their individual enzyme forms. Among the GV-hybrid clones, the GV7 clone showed remarkable improvements in the catalytic activity toward both G-type OPNA analogs (kcat/Km (106 M-1 min-1): 59.8 ± 0.06 (paraoxon), 5.2 ± 0.02 (PNPDPP) and 47.0 ± 6.0 (DFP)) and V-type OPNA analogs (kcat/Km (M-1 min-1): 504.3 ± 48.5 (DSM) and 1324.0 ± 47.5 (malathion)). In conclusion, we developed GV-hybrid forms of rePON1 and bacterial OPH mutants as effective and suitable catalytic bioscavengers to hydrolyze a broad range of OPNA analogs.