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  1. Article ; Online: Hybrid and Asymmetric Supercapacitors: Achieving Balanced Stored Charge across Electrode Materials.

    Qorbani, Mohammad / Chen, Kuei-Hsien / Chen, Li-Chyong

    Small (Weinheim an der Bergstrasse, Germany)

    2024  , Page(s) e2400558

    Abstract: An electrochemical capacitor configuration extends its operational potential window by leveraging diverse charge storage mechanisms on the positive and negative electrodes. Beyond harnessing capacitive, pseudocapacitive, or Faradaic energy storage ... ...

    Abstract An electrochemical capacitor configuration extends its operational potential window by leveraging diverse charge storage mechanisms on the positive and negative electrodes. Beyond harnessing capacitive, pseudocapacitive, or Faradaic energy storage mechanisms and enhancing electrochemical performance at high rates, achieving a balance of stored charge across electrodes poses a significant challenge over a wide range of charge-discharge currents or sweep rates. Consequently, fabricating hybrid and asymmetric supercapacitors demands precise electrochemical evaluations of electrode materials and the development of a reliable methodology. This work provides an overview of fundamental aspects related to charge-storage mechanisms and electrochemical methods, aiming to discern the contribution of each process. Subsequently, the electrochemical properties, including the working potential windows, rate capability profiles, and stabilities, of various families of electrode materials are explored. It is then demonstrated, how charge balancing between electrodes falters across a broad range of charge-discharge currents or sweep rates. Finally, a methodology for achieving charge balance in hybrid and asymmetric supercapacitors is proposed, outlining multiple conditions dependent on loaded mass and charge-discharge current. Two step-by-step tutorials and model examples for applying this methodology are also provided. The proposed methodology is anticipated to stimulate continued dialogue among researchers, fostering advancements in achieving stable and high-performance supercapacitor devices.
    Language English
    Publishing date 2024-04-03
    Publishing country Germany
    Document type Journal Article ; Review
    ZDB-ID 2168935-0
    ISSN 1613-6829 ; 1613-6810
    ISSN (online) 1613-6829
    ISSN 1613-6810
    DOI 10.1002/smll.202400558
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  2. Article: How to Promote Medium-Sized Farms to Adopt Environmental Strategy to Achieve Sustainable Production during the COVID-19 Pandemic?

    Huang, Stanley Y. B. / Chen, Kuei-Hsien / Lee, Yue-Shi

    Agriculture (Basel). 2021 Oct. 27, v. 11, no. 11

    2021  

    Abstract: To achieve sustainable production in medium-sized farms, this research proposes a hierarchical linear modeling (HLM) to predict environmental strategy (ES), which is a crucial source of sustainable production. Based on the theory of upper echelons, the ... ...

    Abstract To achieve sustainable production in medium-sized farms, this research proposes a hierarchical linear modeling (HLM) to predict environmental strategy (ES), which is a crucial source of sustainable production. Based on the theory of upper echelons, the present research puts forward that the environmental leadership (EL) of the chief executive officer (CEO) at phase one affects the development of environmental corporate social responsibility (ECSR) adoption, which in turn affects the development of ES adoption over time. The empirical data were obtained through a three-stage sampling method of 90 CEOs and 270 members of senior management teams (SETs) of Taiwanese medium-sized farms, over a period of six months. The research results support that the higher level of CEO EL at phase one results in the development of ECSR adoption, which in turn results in the development of ES adoption. This research opens a new direction for sustainable production by showing how to implement ES through organizational management mechanisms (EL). These findings can fill the gaps in the literature on the sustainable production of farms and can also help these farms to achieve sustainable production by adopting ES.
    Keywords COVID-19 infection ; agriculture ; corporate social responsibility ; leadership
    Language English
    Dates of publication 2021-1027
    Publishing place Multidisciplinary Digital Publishing Institute
    Document type Article
    ZDB-ID 2651678-0
    ISSN 2077-0472
    ISSN 2077-0472
    DOI 10.3390/agriculture11111052
    Database NAL-Catalogue (AGRICOLA)

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  3. Article ; Online: Boosting Thermoelectric Performance in Nanocrystalline Ternary Skutterudite Thin Films through Metallic CoTe

    Jarwal, Bhawna / Abbas, Suman / Chou, Ta-Lei / Vailyaveettil, Suneesh M / Kumar, Ashutosh / Quadir, Shaham / Ho, Thi-Thong / Wong, Deniz P / Chen, Li-Chyong / Chen, Kuei-Hsien

    ACS applied materials & interfaces

    2024  Volume 16, Issue 12, Page(s) 14770–14780

    Abstract: Metal-semiconductor nanocomposites have emerged as a viable strategy for concurrently tailoring both thermal and electronic transport properties of established thermoelectric materials, ultimately achieving synergistic performance. In this investigation, ...

    Abstract Metal-semiconductor nanocomposites have emerged as a viable strategy for concurrently tailoring both thermal and electronic transport properties of established thermoelectric materials, ultimately achieving synergistic performance. In this investigation, a series of nanocomposite thin films were synthesized, embedding metallic cobalt telluride (CoTe
    Language English
    Publishing date 2024-03-15
    Publishing country United States
    Document type Journal Article
    ISSN 1944-8252
    ISSN (online) 1944-8252
    DOI 10.1021/acsami.3c17695
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article ; Online: Synergistic Electronic Interaction of Nitrogen Coordinated Fe-Sn Double-Atom Sites: An Efficient Electrocatalyst for Oxygen Reduction Reaction.

    Krishnamoorthy, Vimal / Sabhapathy, Palani / Raghunath, Puttikam / Huang, Chih-Yang / Sabbah, Amr / Hussien, Mahmoud Kamal / Syum, Zeru / Muthusamy, Saravanakumar / Lin, Ming-Chang / Wu, Heng-Liang / Chen, Ruei-San / Chen, Kuei-Hsien / Chen, Li-Chyong

    Small methods

    2024  , Page(s) e2301674

    Abstract: Double-atom site catalysts (DASs) have emerged as a recent trend in the oxygen reduction reaction (ORR), thereby modifying the intermediate adsorption energies and increasing the activity. However, the lack of an efficient dual atom site to improve ... ...

    Abstract Double-atom site catalysts (DASs) have emerged as a recent trend in the oxygen reduction reaction (ORR), thereby modifying the intermediate adsorption energies and increasing the activity. However, the lack of an efficient dual atom site to improve activity and durability has limited these catalysts from widespread application. Herein, the nitrogen-coordinated iron and tin-based DASs (Fe-Sn-N/C) catalyst are synthesized for ORR. This catalyst has a high activity with ORR half-wave potentials (E
    Language English
    Publishing date 2024-01-29
    Publishing country Germany
    Document type Journal Article
    ISSN 2366-9608
    ISSN (online) 2366-9608
    DOI 10.1002/smtd.202301674
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  5. Article: An ultrathin amorphous defective co-doped hematite passivation layer derived via an in situ electrochemical method for durable photoelectrochemical water oxidation

    Fathabadi, Milad / Qorbani, Mohammad / Sabbah, Amr / Quadir, Shaham / Huang, Chih-Yang / Chen, Kuei-Hsien / Chen, Li-Chyong / Naseri, Naimeh

    Journal of materials chemistry A. 2022 Aug. 10, v. 10, no. 31

    2022  

    Abstract: Although hematite (i.e., α-Fe₂O₃) has been widely investigated in photoelectrochemical water oxidation studies due to its high theoretical photocurrent density, it still suffers from serious surface charge recombination and low photoelectrochemical ... ...

    Abstract Although hematite (i.e., α-Fe₂O₃) has been widely investigated in photoelectrochemical water oxidation studies due to its high theoretical photocurrent density, it still suffers from serious surface charge recombination and low photoelectrochemical stability. Here we report an in situ electrochemical method to form a uniform and ultrathin (i.e., 3–5 nm) passivation layer all over the pores of an optimized ∼3.2% Ti-doped α-Fe₂O₃ photoanode. We unveil the amorphous and defective nature of the in situ derived layer assigned to a high concentration of oxygen vacancies and intercalated potassium atoms there, i.e., the formation of Ti/K co-doped defective α-Fe₂O₃₋ₓ. Owing to the efficient passivation of surface states, alleviated surface-potential fluctuations, and low charge-transfer resistance at the interface, photoanodes show an average of ∼60% enhancement in the photoelectrochemical performance, applied bias absorbed photon-to-current efficiency of 0.43%, and faradaic efficiency of ∼88%. Moreover, the passivation layer prevents direct contact between the electrode material and electrolyte, resulting in less degradation and outstanding photoelectrochemical stability with a photocurrent retention of ∼95% after ∼100 hours, albeit by performing several successive in situ electrochemical passivation processes. This work presents an industrially scalable method to controllably engineer the interfaces of semiconductors–electrolytes with precious metal-free defective hematite-based co-catalysts for sustainable photoelectrochemical solar-to-fuel conversion applications.
    Keywords direct contact ; electric current ; electrochemistry ; electrodes ; electrolytes ; hematite ; oxidation ; oxygen ; potassium
    Language English
    Dates of publication 2022-0810
    Size p. 16655-16665.
    Publishing place The Royal Society of Chemistry
    Document type Article
    ZDB-ID 2702232-8
    ISSN 2050-7496 ; 2050-7488
    ISSN (online) 2050-7496
    ISSN 2050-7488
    DOI 10.1039/d2ta03792k
    Database NAL-Catalogue (AGRICOLA)

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  6. Article ; Online: Integrated nano-architectured photocatalysts for photochemical CO

    Shit, Subhash Chandra / Shown, Indrajit / Paul, Ratul / Chen, Kuei-Hsien / Mondal, John / Chen, Li-Chyong

    Nanoscale

    2020  Volume 12, Issue 46, Page(s) 23301–23332

    Abstract: Recent advances in nanotechnology, especially the development of integrated nanostructured materials, have offered unprecedented opportunities for photocatalytic CO2 reduction. Compared to bulk semiconductor photocatalysts, most of these nanostructured ... ...

    Abstract Recent advances in nanotechnology, especially the development of integrated nanostructured materials, have offered unprecedented opportunities for photocatalytic CO2 reduction. Compared to bulk semiconductor photocatalysts, most of these nanostructured photocatalysts offer at least one advantage in areas such as photogenerated carrier kinetics, light absorption, and active surface area, supporting improved photochemical reaction efficiencies. In this review, we briefly cover the cutting-edge research activities in the area of integrated nanostructured catalysts for photochemical CO2 reduction, including aqueous and gas-phase reactions. Primarily explored are the basic principles of tailor-made nanostructured composite photocatalysts and how nanostructuring influences photochemical performance. Specifically, we summarize the recent developments related to integrated nanostructured materials for photocatalytic CO2 reduction, mainly in the following five categories: carbon-based nano-architectures, metal-organic frameworks, covalent-organic frameworks, conjugated porous polymers, and layered double hydroxide-based inorganic hybrids. Besides the technical aspects of nanostructure-enhanced catalytic performance in photochemical CO2 reduction, some future research trends and promising strategies are addressed.
    Language English
    Publishing date 2020-10-27
    Publishing country England
    Document type Journal Article ; Review
    ZDB-ID 2515664-0
    ISSN 2040-3372 ; 2040-3364
    ISSN (online) 2040-3372
    ISSN 2040-3364
    DOI 10.1039/d0nr05884j
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  7. Article ; Online: Optimized electronic properties and nano-structural features for securing high thermoelectric performance in doped GeTe.

    Yang, Zan / Tseng, Yu-Chih / Meledath Valiyaveettil, Suneesh / Yuan, Hui / Smith, Evan / Chen, Kuei-Hsien / Huang, Yuyang / Zou, Tianze / Kycia, Jan / Mozharivskyj, Yurij

    Dalton transactions (Cambridge, England : 2003)

    2023  Volume 52, Issue 31, Page(s) 10689–10699

    Abstract: Recently, thermoelectric (TE) materials have been attracting great attention due to their improved capability to convert heat directly into electricity. PbTe-based TE materials are among the most competitive ones; however, lead toxicity limits their ... ...

    Abstract Recently, thermoelectric (TE) materials have been attracting great attention due to their improved capability to convert heat directly into electricity. PbTe-based TE materials are among the most competitive ones; however, lead toxicity limits their potential applications. Thus, the current focus in the field is on the discovery of lead-free analogues. GeTe is considered to be a promising candidate, however, its thermoelectric performance is limited by a non-ideal band structure and intrinsic Ge vacancies. In this work, GeTe was co-doped with Bi, Zn, and In. Initial doping with Bi enhances the performance by tuning the electronic properties and bringing down the thermal conductivity. Subsequent Zn doping permits to maintain the high power factor by increasing carrier mobility and reducing carrier concentration. Additionally, Zn incorporation lowers thermal conductivity and, thus, increases the performance. Subsequent In doping in (Ge
    Language English
    Publishing date 2023-08-08
    Publishing country England
    Document type Journal Article
    ZDB-ID 1472887-4
    ISSN 1477-9234 ; 1364-5447 ; 0300-9246 ; 1477-9226
    ISSN (online) 1477-9234 ; 1364-5447
    ISSN 0300-9246 ; 1477-9226
    DOI 10.1039/d3dt01017a
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  8. Article ; Online: Axial Chlorine Induced Electron Delocalization in Atomically Dispersed FeN4 Electrocatalyst for Oxygen Reduction Reaction with Improved Hydrogen Peroxide Tolerance.

    Sabhapathy, Palani / Raghunath, Puttikam / Sabbah, Amr / Shown, Indrajit / Bayikadi, Khasim Saheb / Xie, Rui-Kun / Krishnamoorthy, Vimal / Lin, Ming-Chang / Chen, Kuei-Hsien / Chen, Li-Chyong

    Small (Weinheim an der Bergstrasse, Germany)

    2023  Volume 19, Issue 45, Page(s) e2303598

    Abstract: Atomically dispersed iron sites on nitrogen-doped carbon (Fe-NC) are the most active Pt-group-metal-free catalysts for oxygen reduction reaction (ORR). However, due to oxidative corrosion and the Fenton reaction, Fe-NC catalysts are insufficiently active ...

    Abstract Atomically dispersed iron sites on nitrogen-doped carbon (Fe-NC) are the most active Pt-group-metal-free catalysts for oxygen reduction reaction (ORR). However, due to oxidative corrosion and the Fenton reaction, Fe-NC catalysts are insufficiently active and stable. Herein, w e demonstrated that the axial Cl-modified Fe-NC (Cl-Fe-NC) electrocatalyst is active and stable for the ORR in acidic conditions with high H
    Language English
    Publishing date 2023-07-11
    Publishing country Germany
    Document type Journal Article
    ZDB-ID 2168935-0
    ISSN 1613-6829 ; 1613-6810
    ISSN (online) 1613-6829
    ISSN 1613-6810
    DOI 10.1002/smll.202303598
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  9. Article ; Online: Mimicking Metalloenzyme Microenvironments in the Transition Metal-Single Atom Catalysts for Electrochemical Hydrogen Peroxide Synthesis in an Acidic Medium.

    Muthusamy, Saravanakumar / Sabhapathy, Palani / Raghunath, Putikam / Sabbah, Amr / Chang, Yu-Chung / Krishnamoorthy, Vimal / Ho, Thi-Thong / Chiou, Jau-Wern / Lin, Ming-Chang / Chen, Li-Chyong / Chen, Kuei-Hsien

    Small methods

    2023  Volume 7, Issue 10, Page(s) e2300234

    Abstract: Electrochemical reduction of oxygen into hydrogen peroxide in an acidic medium offers an energy-efficient and green ... ...

    Abstract Electrochemical reduction of oxygen into hydrogen peroxide in an acidic medium offers an energy-efficient and green H
    Language English
    Publishing date 2023-07-03
    Publishing country Germany
    Document type Journal Article
    ISSN 2366-9608
    ISSN (online) 2366-9608
    DOI 10.1002/smtd.202300234
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  10. Article: Advanced nanoporous separators for stable lithium metal electrodeposition at ultra-high current densities in liquid electrolytes

    Yang, Jingling / Wang, Chun-Yao / Wang, Chun-Chieh / Chen, Kuei-Hsien / Mou, Chung-Yuan / Wu, Heng-Liang

    Journal of materials chemistry A. 2020 Mar. 10, v. 8, no. 10

    2020  

    Abstract: Lithium metal anodes form a dendritic structure after cycling which causes an internal short circuit in flammable electrolytes and results in battery fires. Today's separators are insufficient for suppressing the formation of lithium dendrites. Herein, ... ...

    Abstract Lithium metal anodes form a dendritic structure after cycling which causes an internal short circuit in flammable electrolytes and results in battery fires. Today's separators are insufficient for suppressing the formation of lithium dendrites. Herein, we report on the use of mesoporous silica thin films (MSTFs) with perpendicular nanochannels (pore size ∼5 nm) stacking on an anodic aluminum oxide (AAO) membrane as the MSTF⊥AAO separator for advancing Li metal batteries. The nanoporous MSTF⊥AAO separator with novel inorganic structures shows ultra-long term stability of Li plating/stripping in Li–Li cells at an ultra-high current density and capacity (10 mA cm−2 and 5 mA h cm−2). A significant improvement over the state-of-the-art separator is evaluated based on three performance indicators, e.g. cycle life, current density and capacity. In Li–Cu cells, the MSTF⊥AAO separator shows a coulombic efficiency of >99.9% at a current density of 10 mA cm−2 for more than 250 h of cycling. The separator gives improved rate capability in Li–LiFePO4 (LFP) batteries. The excellent performance of the MSTF⊥AAO separator is due to good wetting of electrolytes, straight nanopores with negative charges, uniform Li deposition and blocking the finest dendrite.
    Keywords aluminum oxide ; anodes ; copper ; dendrites ; electrolytes ; electroplating ; films (materials) ; fires ; ionic liquids ; lithium ; lithium batteries ; nanopores ; porosity ; porous media ; separators ; silica
    Language English
    Dates of publication 2020-0310
    Size p. 5095-5104.
    Publishing place The Royal Society of Chemistry
    Document type Article
    ZDB-ID 2702232-8
    ISSN 2050-7496 ; 2050-7488
    ISSN (online) 2050-7496
    ISSN 2050-7488
    DOI 10.1039/c9ta13778e
    Database NAL-Catalogue (AGRICOLA)

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