Showing papers by "Wonyong Choi published in 2022"
TL;DR: In this article, a simple wetness impregnation approach was used to catalyze 100ppm formaldehyde (FA) into CO2 at room temperature (RT: 30°C).
31 citations
TL;DR: In this paper, the pH swing method was used for the extraction of calcium ions and comprised three phases: calcium ion leaching from MSWI fly ash phase, removal of cations from the supernatant, and calcium ion recovery.
9 citations
8 citations
TL;DR: In this paper , an earth-abundant cobalt-copper (Co1-xCux) nanoparticles supported on a three-dimensional substrate for efficient and selective ammonia (NH3) synthesis via electrocatalytic nitrate reduction is presented.
Abstract: Ammonia (NH3) is a valuable chemical for fertilizer production and for use as an effective hydrogen carrier. Electrocatalytic nitrate reduction has recently received great attention as an alternative for NH3 synthesis due to its kinetically favorable reaction. However, this promising strategy suffers from low Faradaic efficiency (FE) at large current density (>100 mA cm–2) and low nitrate concentrations because of the competing hydrogen evolution reaction. Herein, we report a catalyst consisting of earth-abundant cobalt–copper (Co1–xCux) nanoparticles supported on a three-dimensional substrate for efficient and selective NH3 synthesis via electrocatalytic nitrate reduction. Typically, the optimized Co0.5Cu0.5 catalyst performs at a high NH3 Faradaic efficiency (FE) of over 95% at −0.03 V with NH3 partial current density of ∼176 mA cm–2 at 50 mM nitrate, which is 7.3- and 1.7-fold higher than that of pure Co and Cu counterparts. Importantly, replacing Co with Cu enables the tuning of onset potential on Co catalyst maintaining high selectivity toward NH3. A stability test over 12 cycles confirmed the long-term operation of this catalyst. This work offers a facile strategy for tuning the catalyst’s elemental composition to attain a desired electrocatalytic activity.
8 citations
6 citations
TL;DR: A novel freezing system that enables the degradation of various organic compounds in a frozen solution that successfully degraded all 12 tested organic pollutants without the requirement for electrical energy is proposed.
5 citations
TL;DR: The Altmetric Attention Score as mentioned in this paper is a quantitative measure of the attention that a research article has received online, and it is calculated using a weighted sum of full text downloads since November 2008 across all institutions and individuals.
Abstract: ADVERTISEMENT RETURN TO ISSUEEditorialNEXTSolar Energy Utilization and Photo(electro)catalysis for Sustainable EnvironmentWonyong ChoiWonyong ChoiMore by Wonyong Choihttps://orcid.org/0000-0003-1801-9386, Fan DongFan DongMore by Fan Donghttps://orcid.org/0000-0003-2890-9964, Marta HatzellMarta HatzellMore by Marta Hatzellhttps://orcid.org/0000-0002-5144-4969, and Guido MulGuido MulMore by Guido Mulhttps://orcid.org/0000-0001-5898-6384Cite this: ACS EST Engg. 2022, 2, 6, 940–941Publication Date (Web):June 10, 2022Publication History Published online10 June 2022Published inissue 10 June 2022https://doi.org/10.1021/acsestengg.2c00182Copyright © Published 2022 by American Chemical SocietyRIGHTS & PERMISSIONSArticle Views138Altmetric-Citations-LEARN ABOUT THESE METRICSArticle Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. These metrics are regularly updated to reflect usage leading up to the last few days.Citations are the number of other articles citing this article, calculated by Crossref and updated daily. Find more information about Crossref citation counts.The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online. Clicking on the donut icon will load a page at altmetric.com with additional details about the score and the social media presence for the given article. Find more information on the Altmetric Attention Score and how the score is calculated. Share Add toView InAdd Full Text with ReferenceAdd Description ExportRISCitationCitation and abstractCitation and referencesMore Options Share onFacebookTwitterWechatLinked InReddit PDF (733 KB) Get e-AlertsSUBJECTS:Atmospheric chemistry,Fossil fuels,Green chemistry,Materials,Solar energy Get e-Alerts
3 citations
TL;DR: In this paper , the first example of phenanthroimidazole-based COFs is reported: PImCOF1 with an imine linkage and PIm-COF2 with a β-ketoenamine-linkage.
Abstract: The rational design of organic semiconductors based on crystalline covalent organic frameworks (COFs) as efficient photocatalysts is highly desirable. In this study, the first example of phenanthroimidazole-based COFs is reported: PImCOF1 with an imine linkage and PIm-COF2 with a β-ketoenamine-linkage. Both COF materials showed substantial optical properties. The average hydrogen evolution rate was 7417.5 μmolg-1h-1 for PIm-COF2, which was 20 times higher than that of PIm-COF1 (358.5 μmolg-1h-1). This can be attributed to the strong donor-acceptor effect of PIm-COF2 and the continuous separation and transfer of the photoexcited electron-hole pair from the phenanthro[9,10-d]imidazole moiety.
2 citations
TL;DR: In this paper, the spontaneous electron transfer is initiated upon introducing reducible inorganic substrates which electrons are transferred from the oxygen-containing functional groups on CNF to the inorganic substrate through Fe2O3 nanorods.
2 citations
TL;DR: Wang et al. as discussed by the authors proposed an interesting strategy that integrating ionic moieties into a covalent organic framework (COF) can increase the dielectric constant of the organic semiconductor, facilitate the exciton dissociation, and thereby boost visible-light-driven photocatalytic production of hydrogen peroxide as a solar fuel from reducing dioxygen.
Abstract: The regulation of the exciton properties is crucial for enhancing the activities of polymeric photocatalysts. In this issue of Chem Catalysis , Wang’s group introduces an interesting strategy that integrating ionic moieties into a covalent organic framework (COF) can increase the dielectric constant of the organic semiconductor, facilitate the exciton dissociation, and thereby boost visible-light-driven photocatalytic production of hydrogen peroxide as a solar fuel from reducing dioxygen. The regulation of the exciton properties is crucial for enhancing the activities of polymeric photocatalysts. In this issue of Chem Catalysis , Wang’s group introduces an interesting strategy that integrating ionic moieties into a covalent organic framework (COF) can increase the dielectric constant of the organic semiconductor, facilitate the exciton dissociation, and thereby boost visible-light-driven photocatalytic production of hydrogen peroxide as a solar fuel from reducing dioxygen.
2 citations
TL;DR: In this paper , the spontaneous electron transfer is initiated upon introducing reducible inorganic substrates which electrons are transferred from the oxygen-containing functional groups on CNF to the inorganic substrate through Fe2O3 nanorods.
14 Jan 2022
TL;DR: Choi et al. as mentioned in this paper proposed the Altmetric Attention Score, which is a quantitative measure of the attention that a research article has received online, and calculated the attention score and the social media presence for the given article.
Abstract: ADVERTISEMENT RETURN TO ISSUEEditorialNEXTThe First Year of ACS ES&T EngineeringWonyong ChoiWonyong ChoiMore by Wonyong Choihttps://orcid.org/0000-0003-1801-9386Cite this: ACS EST Engg. 2022, 2, 1, 1–2Publication Date (Web):January 14, 2022Publication History Published online14 January 2022Published inissue 14 January 2022https://doi.org/10.1021/acsestengg.1c00498Copyright © 2022 American Chemical SocietyRIGHTS & PERMISSIONSArticle Views886Altmetric-Citations-LEARN ABOUT THESE METRICSArticle Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. These metrics are regularly updated to reflect usage leading up to the last few days.Citations are the number of other articles citing this article, calculated by Crossref and updated daily. Find more information about Crossref citation counts.The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online. Clicking on the donut icon will load a page at altmetric.com with additional details about the score and the social media presence for the given article. Find more information on the Altmetric Attention Score and how the score is calculated. Share Add toView InAdd Full Text with ReferenceAdd Description ExportRISCitationCitation and abstractCitation and referencesMore Options Share onFacebookTwitterWechatLinked InReddit PDF (732 KB) Get e-AlertsSUBJECTS:Materials,Membranes,Nanomaterials,Quality management,Sustainability Get e-Alerts
01 Jan 2022
13 May 2022
TL;DR: The Altmetric Attention Score as discussed by the authors is a quantitative measure of the attention that a research article has received online, and it is calculated using a weighted sum of full text article downloads since November 2008 across all institutions and individuals.
Abstract: ADVERTISEMENT RETURN TO ISSUEEditorialNEXTACS ES&T Engineering’s Inaugural Excellence in Review Awards for 2021Nancy LoveNancy LoveMore by Nancy Love, Jaehong KimJaehong KimMore by Jaehong Kim, Jun MaJun MaMore by Jun Ma, and Wonyong ChoiWonyong ChoiMore by Wonyong Choihttps://orcid.org/0000-0003-1801-9386Cite this: ACS EST Engg. 2022, 2, 5, 726–727Publication Date (Web):May 13, 2022Publication History Published online13 May 2022Published inissue 13 May 2022https://doi.org/10.1021/acsestengg.2c00122Copyright © 2022 American Chemical SocietyRIGHTS & PERMISSIONSArticle Views360Altmetric-Citations-LEARN ABOUT THESE METRICSArticle Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. These metrics are regularly updated to reflect usage leading up to the last few days.Citations are the number of other articles citing this article, calculated by Crossref and updated daily. Find more information about Crossref citation counts.The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online. Clicking on the donut icon will load a page at altmetric.com with additional details about the score and the social media presence for the given article. Find more information on the Altmetric Attention Score and how the score is calculated. Share Add toView InAdd Full Text with ReferenceAdd Description ExportRISCitationCitation and abstractCitation and referencesMore Options Share onFacebookTwitterWechatLinked InReddit PDF (565 KB) Get e-AlertsSUBJECTS:Quality management Get e-Alerts
TL;DR: In this article , a road map article explores a range of issues related to both photocatalytic and photoelectrocatalytic hydrogen generation ranging from basic processes, materials science through to reactor engineering and applications for biomass reforming.
Abstract: As a consequence of the issues resulting from global climate change many nations are starting to transition to being low or net zero carbon economies. To achieve this objective practical alternative fuels are urgently required and hydrogen gas is deemed one of the most desirable substitute fuels to traditional hydrocarbons. A significant challenge, however, is obtaining hydrogen from sources with low or zero carbon footprint i.e. so called ‘green’ hydrogen. Consequently, there are a number of strands of research into processes that are practical techniques for the production of this ‘green’ hydrogen. Over the past five decades there has been a significant body of research into photocatalytic (PC)/photoelectrocatalytic processes for hydrogen production through water splitting or water reduction. There have, however been significant issues faced in terms of the practical capability of this promising technology to produce hydrogen at scale. This road map article explores a range of issues related to both PC and photoelectrocatalytic hydrogen generation ranging from basic processes, materials science through to reactor engineering and applications for biomass reforming.
01 Jan 2022
TL;DR: In this paper , the first reported thermocatalytic oxidation of an indoor volatile organic compound (VOC), acetaldehyde, by harnessing the waste-heat energy from indoor light sources (e.g., halogen lamps) without additional energy inputs was demonstrated.