The electrochemical conversion of CO2 into C1 to C2 hydrocarbon such as Methane and ethylene is a promising pathway towards to achieve net zero however due to high activation barrier for CO2 it remains a big challenge. In this work, an effective strategy has been developed through the synthesis of a low-cost Vanadium and Copper based layered double hydroxide (LDH) decorated with TiO2 nanoparticles (VCu LDH/TiO2) as a highly efficient electrocatalyst for the electrochemical CO2 reduction to ethylene. The structural and morphological study of the developed electrocatalyst was analyzed with the help of various analytical instruments such as X-ray diffractometer (XRD), Fourier Transform-Infrared (FT-IR), Scanning Electron Microscopy (FESEM), X-ray photoelectron microscopy (XPS) and Transmission Electron Microscopy (TEM) which confirmed the successful formation of VCu LDH/TiO2. The electrochemical CO2 reduction reaction (CO2RR) study was performed in 0.1 M KHCO3 using H-type cell and showed the formation of CO, CH4, and C2H4 value added end products. The highest faradaic efficiency of 92% for C2H4 was obtained at -0.4 V vs RHE. The above results suggest that the VCu LDH/TiO2 NPs electrocatalyst may be an excellent candidate for the CO2 reduction and can be also utilized in wide range of energy conversion and storage applications.
将 CO2 电化学转化为 C1 到 C2 碳氢化合物（如甲烷和乙烯）是实现净零排放的一条很有前景的途径，但由于 CO2 的活化障碍很高，这仍然是一个巨大的挑战。在这项工作中，我们开发了一种有效的策略，即通过合成一种用二氧化钛纳米颗粒（VCu LDH/TiO2）装饰的低成本钒铜基层状双氢氧化物（LDH），作为电化学将二氧化碳还原成乙烯的高效电催化剂。借助各种分析仪器，如 X 射线衍射仪 (XRD)、傅立叶变换红外光谱 (FT-IR)、扫描电子显微镜 (FESEM)、X 射线光电子显微镜 (XPS) 和透射电子显微镜 (TEM)，对所开发的电催化剂的结构和形态进行了分析，证实了 VCu LDH/TiO2 的成功形成。使用 H 型电池在 0.1 M KHCO3 中进行了电化学 CO2 还原反应（CO2RR）研究，结果表明形成了 CO、CH4 和 C2H4 等增值最终产物。在 -0.4 V vs RHE 条件下，C2H4 的最高法拉第效率为 92%。上述结果表明，VCu LDH/TiO2 NPs 电催化剂可能是二氧化碳还原的理想候选催化剂，也可广泛应用于能源转换和储存领域。
{"title":"Boosting Ethylene Yield via Synergistic 2D/0D Nanostructured VCu Layered Double Hydroxide/TiO2 Catalyst in Electrochemical CO2 Reduction","authors":"Sneha Lavate, Rohit Srivastava","doi":"10.1039/d4ya00417e","DOIUrl":"https://doi.org/10.1039/d4ya00417e","url":null,"abstract":"The electrochemical conversion of CO2 into C1 to C2 hydrocarbon such as Methane and ethylene is a promising pathway towards to achieve net zero however due to high activation barrier for CO2 it remains a big challenge. In this work, an effective strategy has been developed through the synthesis of a low-cost Vanadium and Copper based layered double hydroxide (LDH) decorated with TiO2 nanoparticles (VCu LDH/TiO2) as a highly efficient electrocatalyst for the electrochemical CO2 reduction to ethylene. The structural and morphological study of the developed electrocatalyst was analyzed with the help of various analytical instruments such as X-ray diffractometer (XRD), Fourier Transform-Infrared (FT-IR), Scanning Electron Microscopy (FESEM), X-ray photoelectron microscopy (XPS) and Transmission Electron Microscopy (TEM) which confirmed the successful formation of VCu LDH/TiO2. The electrochemical CO2 reduction reaction (CO2RR) study was performed in 0.1 M KHCO3 using H-type cell and showed the formation of CO, CH4, and C2H4 value added end products. The highest faradaic efficiency of 92% for C2H4 was obtained at -0.4 V vs RHE. The above results suggest that the VCu LDH/TiO2 NPs electrocatalyst may be an excellent candidate for the CO2 reduction and can be also utilized in wide range of energy conversion and storage applications.","PeriodicalId":72913,"journal":{"name":"Energy advances","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142259217","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Kunpeng Liu, Xu Wang, Nan Wang, Ruiyong Zhang, Meinan Yang, Baorong Hou, Wolfgang Sand
Rationally designing high-efficiency catalysts for electrochemical two-electron water oxidation reaction (2e- WOR) to produce hydrogen peroxide (H2O2) is extremely important, while designing bimetallic metal-organic framework (MOF) is of great significance for effective 2e- WOR. Herein, MIL-53(Fe) and different proportions of Co doped MIL-53(Fe) were prepared by hydrothermal method. The structural characterization and elemental analysis showed that the Co ions were successfully doped into MIL-53(Fe) to form MIL-53(Fe/Co) bimetallic MOF, and the morphology of MIL-53(Fe/Co) became more regular after Co doping. We found that the optimized MIL-53(Fe/Co) exhibits remarkable 2e- WOR performance, which gave an overpotential of 150 mV at 1 mA cm-2. The overpotentials of MIL-53(Fe/Co) was approximately 220 mV (at 1 mA cm-2) lower than MIL-53(Fe), which may attribute to the change of microstructure of MIL-53(Fe) after Co doping and the synergistic effect between Fe/Co. Our work introduces a strategy for designing bimetallic MOF-based electrocatalysts, opening up new possibilities for efficient 2e- WOR systems.
合理设计电化学双电子水氧化反应（2e-WOR）生成过氧化氢（H2O2）的高效催化剂极为重要，而设计双金属金属有机框架（MOF）对有效的 2e- WOR 具有重要意义。本文采用水热法制备了 MIL-53(Fe)和不同比例的 Co 掺杂 MIL-53(Fe)。结构表征和元素分析表明，Co 离子成功掺杂到 MIL-53(Fe)中形成了 MIL-53(Fe/Co)双金属 MOF，掺 Co 后的 MIL-53(Fe/Co) 形貌变得更加规整。我们发现，优化后的 MIL-53(Fe/Co)具有显著的 2e- WOR 性能，在 1 mA cm-2 时的过电位为 150 mV。MIL-53(Fe/Co) 的过电位比 MIL-53(Fe) 低约 220 mV（1 mA cm-2），这可能是由于掺入 Co 后 MIL-53(Fe) 的微观结构发生了变化以及 Fe/Co 之间的协同效应。我们的工作介绍了一种设计基于双金属 MOF 的电催化剂的策略，为高效 2e- WOR 系统开辟了新的可能性。
{"title":"Effective electrochemical water oxidation to H2O2 based on bimetallic Fe/Co metal-organic framework","authors":"Kunpeng Liu, Xu Wang, Nan Wang, Ruiyong Zhang, Meinan Yang, Baorong Hou, Wolfgang Sand","doi":"10.1039/d4ya00477a","DOIUrl":"https://doi.org/10.1039/d4ya00477a","url":null,"abstract":"Rationally designing high-efficiency catalysts for electrochemical two-electron water oxidation reaction (2e- WOR) to produce hydrogen peroxide (H2O2) is extremely important, while designing bimetallic metal-organic framework (MOF) is of great significance for effective 2e- WOR. Herein, MIL-53(Fe) and different proportions of Co doped MIL-53(Fe) were prepared by hydrothermal method. The structural characterization and elemental analysis showed that the Co ions were successfully doped into MIL-53(Fe) to form MIL-53(Fe/Co) bimetallic MOF, and the morphology of MIL-53(Fe/Co) became more regular after Co doping. We found that the optimized MIL-53(Fe/Co) exhibits remarkable 2e- WOR performance, which gave an overpotential of 150 mV at 1 mA cm-2. The overpotentials of MIL-53(Fe/Co) was approximately 220 mV (at 1 mA cm-2) lower than MIL-53(Fe), which may attribute to the change of microstructure of MIL-53(Fe) after Co doping and the synergistic effect between Fe/Co. Our work introduces a strategy for designing bimetallic MOF-based electrocatalysts, opening up new possibilities for efficient 2e- WOR systems.","PeriodicalId":72913,"journal":{"name":"Energy advances","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142259219","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
A unique feature of redox flow batteries (RFBs) is that their open circuit voltage (OCV) depends strongly on the state of charge (SOC). In the present work, this relation is investigated experimentally for the all-vanadium RFB (AVRFB), which uses vanadium ions of different oxidation states as redox pairs in both half-cells. In contrast to several literature studies, which use OCV measurements to deduce the SOC via the Nernst equation, we propose a method based on UV-Vis spectroscopy for SOC estimation, thereby enabling completely independent SOC and OCV measurements. Moreover, rather than relying on data at a single wavelength this UV-Vis method uses the entire absorption spectrum to obtain more robust values for the SOC. The obtained SOC-OCV data agree reasonably well with literature values and reveal a significant influence of the thermodynamic non-ideality of the solutions on the OCV as described by the Nernst equation.
{"title":"Open Circuit Voltage of an All-Vanadium Redox Flow Battery as a Function of the State of Charge obtained from UV-Vis Spectroscopy","authors":"Jana Heiß, Maximilian Kohns","doi":"10.1039/d4ya00360h","DOIUrl":"https://doi.org/10.1039/d4ya00360h","url":null,"abstract":"A unique feature of redox flow batteries (RFBs) is that their open circuit voltage (OCV) depends strongly on the state of charge (SOC). In the present work, this relation is investigated experimentally for the all-vanadium RFB (AVRFB), which uses vanadium ions of different oxidation states as redox pairs in both half-cells. In contrast to several literature studies, which use OCV measurements to deduce the SOC via the Nernst equation, we propose a method based on UV-Vis spectroscopy for SOC estimation, thereby enabling completely independent SOC and OCV measurements. Moreover, rather than relying on data at a single wavelength this UV-Vis method uses the entire absorption spectrum to obtain more robust values for the SOC. The obtained SOC-OCV data agree reasonably well with literature values and reveal a significant influence of the thermodynamic non-ideality of the solutions on the OCV as described by the Nernst equation.","PeriodicalId":72913,"journal":{"name":"Energy advances","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142207338","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Zeolite-templated carbons (ZTCs) are widely studied from basic research to applied research owing to their characteristic pore structures. To synthesize ZTCs, smaller molecules than the pore sizes of template zeolites have been used as carbon sources for their carbonization in the zeolite pores. Therefore, a type of carbon sources has been limited to smaller molecules than the pore sizes of zeolites. In this study, highly structurally regular N-doped zeolite-templated carbons are synthesized using propylene as a carbon source and chitin as both a carbon and nitrogen source via depolymerized oligomer filling (DOF) mechanism. Chitin, the second most abundant biopolymer on Earth, consists of N-acetylglucosamine (GlcNAc) as its unit structure and has a much larger size than the zeolite pores. NaY zeolite is used as a template without drying and mixed with chitin. The mixture is subject to chemical vapor deposition (CVD) using propylene and subsequent heat treatment for graphitization, followed by HF etching for zeolite removal. Upon heating the mixture of the zeolite and chitin, chitin is catalytically depolymerized into chitin oligosaccharide radicals by the zeolite, and the radicals are absorbed in the zeolite pores below 450 °C, which is supported by electron spin resonance and N2 adsorption/desorption analyses. The ZTC structure is completed by propylene CVD for adequately filling carbon in the zeolite pores. A validation experiment is conducted using GlcNAc instead of chitin to confirm that the N-doped ZTC is synthesized via the DOF mechanism. The resulting N-doped ZTCs have high structural regularity and high surface areas from 3420 to 3740 m2 g−1, and show higher area-normalized capacitance than undoped ZTC as electric double-layer capacitor electrodes. Utilizing chitin from crustacean shells as one of the raw materials highlights an innovative approach to waste reduction and advances sustainable material science, contributing to the circular economy and sustainable development goals.
{"title":"Synthesis of N-Doped Zeolite-Templated Carbons via Depolymerized Oligomer Filling: Applications in EDLC Electrodes","authors":"Hiroyuki Itoi, Chika Matsuoka, Ginga Saeki, Hiroyuki Iwata, Shinichiroh Iwamura, Keigo Wakabayashi, Takeharu Yoshii, Hirotomo Nishihara, Yoshimi Ohzawa","doi":"10.1039/d4ya00400k","DOIUrl":"https://doi.org/10.1039/d4ya00400k","url":null,"abstract":"Zeolite-templated carbons (ZTCs) are widely studied from basic research to applied research owing to their characteristic pore structures. To synthesize ZTCs, smaller molecules than the pore sizes of template zeolites have been used as carbon sources for their carbonization in the zeolite pores. Therefore, a type of carbon sources has been limited to smaller molecules than the pore sizes of zeolites. In this study, highly structurally regular N-doped zeolite-templated carbons are synthesized using propylene as a carbon source and chitin as both a carbon and nitrogen source via depolymerized oligomer filling (DOF) mechanism. Chitin, the second most abundant biopolymer on Earth, consists of <em>N</em>-acetylglucosamine (GlcNAc) as its unit structure and has a much larger size than the zeolite pores. NaY zeolite is used as a template without drying and mixed with chitin. The mixture is subject to chemical vapor deposition (CVD) using propylene and subsequent heat treatment for graphitization, followed by HF etching for zeolite removal. Upon heating the mixture of the zeolite and chitin, chitin is catalytically depolymerized into chitin oligosaccharide radicals by the zeolite, and the radicals are absorbed in the zeolite pores below 450 °C, which is supported by electron spin resonance and N<small><sub>2</sub></small> adsorption/desorption analyses. The ZTC structure is completed by propylene CVD for adequately filling carbon in the zeolite pores. A validation experiment is conducted using GlcNAc instead of chitin to confirm that the N-doped ZTC is synthesized via the DOF mechanism. The resulting N-doped ZTCs have high structural regularity and high surface areas from 3420 to 3740 m<small><sup>2</sup></small> g<small><sup>−1</sup></small>, and show higher area-normalized capacitance than undoped ZTC as electric double-layer capacitor electrodes. Utilizing chitin from crustacean shells as one of the raw materials highlights an innovative approach to waste reduction and advances sustainable material science, contributing to the circular economy and sustainable development goals.","PeriodicalId":72913,"journal":{"name":"Energy advances","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142207341","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Revathy B Nair, A. Anantha Krishnan, M. A. Aneesh Kumar, R. Sivaraj, H. Sreehari, Vidhya C. Bose, M. Ameen Sha, Thomas Matthew, Sajith Kurian, P. S. Arun
Ag-NiP-deposited carbon channels on NiP panels were successfully developed through lemon juice extract (Ag-CL/NiP) and citric acid (Ag-CC/NiP)-assisted methodologies. The methods involved the precise execution of electroless deposition of the advanced Ag-Carbon matrix with NiP. The lemon juice-assisted method produced carbon channels with a dense concentration of Ag-NiP on the electrode surface, whereas the citric acid method resulted in a less dense deposition of Ag-NiP on the electrode surface, as obseved from FE-SEM. The Ag-CL/NiP has remarkably higher electro- and photocatalytic water splitting performance due to the compact and conductive Ag-NiP connected with carbon channels Electrochemical impedance analysis of Ag-CL/NiP revealed a low Rct of 491.3 Ω at the open circuit potential, indicating enhanced conductivity. The electrocatalytic Oxygen Evolution Reaction (OER) overpotential of Ag-CL/NiP was 401 mV to achieve a current density of 50 mA cm-2, with a Tafel slope of 46.5 mV.dec-1. The panel exhibited good stability, with a proven durability of over 1000 cycles of CV during OER. The developed panel achieved an impressive photo current density of ̴9.5 mA cm⁻² at 1.37 V vs. RHE when subjected to light irradiation with a wavelength exceeding 420 nm. Furthermore, the Ag-CL/NiP panel demonstrated the ability to generate 17.5 mmol cm⁻² of H₂ over a 4-hour sunlight irradiation period. Temperature-controlled photocatalytic water splitting performance showed that the panel remained active at a lower temperatures upto ~12°C, with ̴40% decrease in photocatalytic efficiency than that under normal sunlight conditions.
{"title":"Ag-NiP Deposited Green Carbon Channels Embedded NiP Panels for Sustainable Water Splitting","authors":"Revathy B Nair, A. Anantha Krishnan, M. A. Aneesh Kumar, R. Sivaraj, H. Sreehari, Vidhya C. Bose, M. Ameen Sha, Thomas Matthew, Sajith Kurian, P. S. Arun","doi":"10.1039/d4ya00463a","DOIUrl":"https://doi.org/10.1039/d4ya00463a","url":null,"abstract":"Ag-NiP-deposited carbon channels on NiP panels were successfully developed through lemon juice extract (Ag-CL/NiP) and citric acid (Ag-CC/NiP)-assisted methodologies. The methods involved the precise execution of electroless deposition of the advanced Ag-Carbon matrix with NiP. The lemon juice-assisted method produced carbon channels with a dense concentration of Ag-NiP on the electrode surface, whereas the citric acid method resulted in a less dense deposition of Ag-NiP on the electrode surface, as obseved from FE-SEM. The Ag-CL/NiP has remarkably higher electro- and photocatalytic water splitting performance due to the compact and conductive Ag-NiP connected with carbon channels Electrochemical impedance analysis of Ag-CL/NiP revealed a low Rct of 491.3 Ω at the open circuit potential, indicating enhanced conductivity. The electrocatalytic Oxygen Evolution Reaction (OER) overpotential of Ag-CL/NiP was 401 mV to achieve a current density of 50 mA cm-2, with a Tafel slope of 46.5 mV.dec-1. The panel exhibited good stability, with a proven durability of over 1000 cycles of CV during OER. The developed panel achieved an impressive photo current density of ̴9.5 mA cm⁻² at 1.37 V vs. RHE when subjected to light irradiation with a wavelength exceeding 420 nm. Furthermore, the Ag-CL/NiP panel demonstrated the ability to generate 17.5 mmol cm⁻² of H₂ over a 4-hour sunlight irradiation period. Temperature-controlled photocatalytic water splitting performance showed that the panel remained active at a lower temperatures upto ~12°C, with ̴40% decrease in photocatalytic efficiency than that under normal sunlight conditions.","PeriodicalId":72913,"journal":{"name":"Energy advances","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142207337","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Christopher G. Cannon, Peter A. A. Klusener, Nigel P. Brandon, Anthony R. J. Kucernak
We show that a number of ubiquitous organic molecules used as redox mediators and chemically sensing species can be used as positive couples in electrochemical energy storage. Air and acid stable organic molecules were tested in aqueous acid electrolytes and employed as the positive electrolyte in H2–organic electrochemical cells. The dissolved organic species were characterised in-operando using UV-vis spectroscopy. N,N,N′,N′-tetramethylbenzidine was found to be a stable and reversible redox organic molecule, with a 2 e− molecule−1 capacity and a 0.83 V cell potential. N-Oxyl species were also tested in purely aqueous acidic flow battery electrolytes. A H2–violuric acid cell produced a reversible potential of 1.16 V and demonstrated promising redox flow cell cycling performance.
{"title":"Electrochemical and spectroscopic characterisation of organic molecules with high positive redox potentials for energy storage in aqueous flow cells","authors":"Christopher G. Cannon, Peter A. A. Klusener, Nigel P. Brandon, Anthony R. J. Kucernak","doi":"10.1039/d4ya00366g","DOIUrl":"https://doi.org/10.1039/d4ya00366g","url":null,"abstract":"We show that a number of ubiquitous organic molecules used as redox mediators and chemically sensing species can be used as positive couples in electrochemical energy storage. Air and acid stable organic molecules were tested in aqueous acid electrolytes and employed as the positive electrolyte in H<small><sub>2</sub></small>–organic electrochemical cells. The dissolved organic species were characterised <em>in-operando</em> using UV-vis spectroscopy. <em>N,N,N</em>′<em>,N</em>′-tetramethylbenzidine was found to be a stable and reversible redox organic molecule, with a 2 e<small><sup>−</sup></small> molecule<small><sup>−1</sup></small> capacity and a 0.83 V cell potential. <em>N</em>-Oxyl species were also tested in purely aqueous acidic flow battery electrolytes. A H<small><sub>2</sub></small>–violuric acid cell produced a reversible potential of 1.16 V and demonstrated promising redox flow cell cycling performance.","PeriodicalId":72913,"journal":{"name":"Energy advances","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142207339","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Arumugam Suryaprakash, A. Ramar, Fu Ming Wang, Kefyalew Wagari Guji, Citra Deliana Dewi Sundari, Laurien Merinda
The redox flow battery is a cost-effective solution for grid-scale energy storage. Its special feature of separate reservoirs and electrodes makes it easy to adjust electrolyte volume and electrode size, improving safety and scalability. In this work, we explore two organic anolytes, chelidamic acid (CDA) and chelidonic acid (CDO), which share similar molecular weight but differ in their heteroatoms: pyridone and pyrone. The half-cell potentials of CDA and CDO anolytes enable them to exhibit theoretical cell voltages of 0.49 V and 0.48 V, respectively, when coupled with K_4 [Fe^II (CN)_6] catholyte. CDA demonstrated a stable discharge capacity of 650 mAh/L over 17 days in a basic medium without any degradation. In contrast, CDO gradually lose its capacity over successive cycles. The mechanism for the decomposition of CDO was analysed through cyclic voltammetry, 1H-NMR, and FTIR spectroscopy techniques. The analytical results revealed that there was a significant impact of tautomerization in CDA and nucleophilic addition in CDO on the performance in ARFB.
{"title":"Tautomerism and Nucleophilic Addition Influenced Performance on Aqueous Organic Redox Flow Batteries of Chelidamic Acid and Chelidonic Acid","authors":"Arumugam Suryaprakash, A. Ramar, Fu Ming Wang, Kefyalew Wagari Guji, Citra Deliana Dewi Sundari, Laurien Merinda","doi":"10.1039/d4ya00331d","DOIUrl":"https://doi.org/10.1039/d4ya00331d","url":null,"abstract":"The redox flow battery is a cost-effective solution for grid-scale energy storage. Its special feature of separate reservoirs and electrodes makes it easy to adjust electrolyte volume and electrode size, improving safety and scalability. In this work, we explore two organic anolytes, chelidamic acid (CDA) and chelidonic acid (CDO), which share similar molecular weight but differ in their heteroatoms: pyridone and pyrone. The half-cell potentials of CDA and CDO anolytes enable them to exhibit theoretical cell voltages of 0.49 V and 0.48 V, respectively, when coupled with K_4 [Fe^II (CN)_6] catholyte. CDA demonstrated a stable discharge capacity of 650 mAh/L over 17 days in a basic medium without any degradation. In contrast, CDO gradually lose its capacity over successive cycles. The mechanism for the decomposition of CDO was analysed through cyclic voltammetry, 1H-NMR, and FTIR spectroscopy techniques. The analytical results revealed that there was a significant impact of tautomerization in CDA and nucleophilic addition in CDO on the performance in ARFB.","PeriodicalId":72913,"journal":{"name":"Energy advances","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142207344","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Yanan Pan, Qi Yang, Xiaoying Liu, Fan Qiu, Junjie Chen, Mengdie Yang, Fan Yang, Haiou Song, Shupeng Zhang
The coupling of low-cost, multiple metals and porous nanocarbon materials, aimed at replacing precious metals to enhance electrocatalytic oxygen reduction, is a critical challenge to some crucial research. This paper constructed a hollow dodecahedron nanocage catalyst (Fe3O4/CuNCs/ZnNx-PHNC) by supporting copper nanoclusters, Fe3O4 nanoparticles, and Zn-NX after sintering and annealing, using the coordination of ZIF-8 and doping copper and iron ions. We observed that the synergy of the multi-metals in the magnetically separable heterojunction catalyst induced an electron transfer and inhibits hydrogen peroxide formation, thus, improving its catalytic performance for oxygen reduction reaction. Its half-wave potential is as high as 0.832 V, and the Tafel slope is 54 mV/decade, superior to many non-precious metal catalysts in literature. The assembled Zn-air battery (ZAB) exhibits a maximum power density of 162 mW⸱cm-2 and ultra-high stability of >500 h at a 5 mA⸱cm-2 current density. The ZAB’s excellent performance also proves high development and practical application prospects.
{"title":"A multi-metal (Fe, Cu, Zn) coordinated hollow porous dodecahedron nanocage catalyst reduces oxygen in Zn-air battery","authors":"Yanan Pan, Qi Yang, Xiaoying Liu, Fan Qiu, Junjie Chen, Mengdie Yang, Fan Yang, Haiou Song, Shupeng Zhang","doi":"10.1039/d4ya00295d","DOIUrl":"https://doi.org/10.1039/d4ya00295d","url":null,"abstract":"The coupling of low-cost, multiple metals and porous nanocarbon materials, aimed at replacing precious metals to enhance electrocatalytic oxygen reduction, is a critical challenge to some crucial research. This paper constructed a hollow dodecahedron nanocage catalyst (Fe3O4/CuNCs/ZnNx-PHNC) by supporting copper nanoclusters, Fe3O4 nanoparticles, and Zn-NX after sintering and annealing, using the coordination of ZIF-8 and doping copper and iron ions. We observed that the synergy of the multi-metals in the magnetically separable heterojunction catalyst induced an electron transfer and inhibits hydrogen peroxide formation, thus, improving its catalytic performance for oxygen reduction reaction. Its half-wave potential is as high as 0.832 V, and the Tafel slope is 54 mV/decade, superior to many non-precious metal catalysts in literature. The assembled Zn-air battery (ZAB) exhibits a maximum power density of 162 mW⸱cm-2 and ultra-high stability of >500 h at a 5 mA⸱cm-2 current density. The ZAB’s excellent performance also proves high development and practical application prospects.","PeriodicalId":72913,"journal":{"name":"Energy advances","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142207346","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Roberto Altieri, Fabian Schmitz, Manuel Schenker, Felix Boll, Luca Rebecchi, Pascal Schweitzer, Matteo Crisci, Ilka Kriegel, Bernd Smarsly, Derck Schlettwein, Francesco Lamberti, Teresa Gatti, Mengjiao Wang
BiOI is a promising material for use in photoelectrocatalytic water oxidation, renowned for its chemical inertness and safety in aqueous media. For device integration, BiOI must be fabricated into films. Considering future industrial applications, automated production is essential. However, current BiOI film production methods lack automation and efficiency. To address this, a continuous automated process is introduced in this study, named AutoDrop, for producing BiOI films. Autodrop results to be a fast and facile method for producing BiOI photoelectrodes. Nanostructured thin films of this layered material are prepared using a syringe pump to dispense the precursor solution onto a continuously spinning substrate. These films are integrated into a multilayered photoelectrode, featuring mesoporous TiO2 as an electron-transporting layer on top of FTO glass. In testing the photoelectrochemical performance of the BiOI/TiO2 photoelectrodes, the highest photocurrent (44 μA cm−2) is found for a heterojunction with a BiOI thickness of 320 nm. Additionally, a further protective TiO2 ultrathin layer in contact with BiOI, grown by atomic layer deposition, enhances the durability and efficiency of the photoanode, resulting in a more than two-fold improvement in photocurrent after 2 hours of continuous operation. This study advances the automation in the sustainable production of photoelectrode films and provides inspiration for further developments in the field.
{"title":"Development of an automated SILAR method for the sustainable fabrication of BiOI/TiO2 photoanodes","authors":"Roberto Altieri, Fabian Schmitz, Manuel Schenker, Felix Boll, Luca Rebecchi, Pascal Schweitzer, Matteo Crisci, Ilka Kriegel, Bernd Smarsly, Derck Schlettwein, Francesco Lamberti, Teresa Gatti, Mengjiao Wang","doi":"10.1039/d4ya00405a","DOIUrl":"https://doi.org/10.1039/d4ya00405a","url":null,"abstract":"BiOI is a promising material for use in photoelectrocatalytic water oxidation, renowned for its chemical inertness and safety in aqueous media. For device integration, BiOI must be fabricated into films. Considering future industrial applications, automated production is essential. However, current BiOI film production methods lack automation and efficiency. To address this, a continuous automated process is introduced in this study, named AutoDrop, for producing BiOI films. Autodrop results to be a fast and facile method for producing BiOI photoelectrodes. Nanostructured thin films of this layered material are prepared using a syringe pump to dispense the precursor solution onto a continuously spinning substrate. These films are integrated into a multilayered photoelectrode, featuring mesoporous TiO<small><sub>2</sub></small> as an electron-transporting layer on top of FTO glass. In testing the photoelectrochemical performance of the BiOI/TiO<small><sub>2</sub></small> photoelectrodes, the highest photocurrent (44 μA cm<small><sup>−2</sup></small>) is found for a heterojunction with a BiOI thickness of 320 nm. Additionally, a further protective TiO<small><sub>2</sub></small> ultrathin layer in contact with BiOI, grown by atomic layer deposition, enhances the durability and efficiency of the photoanode, resulting in a more than two-fold improvement in photocurrent after 2 hours of continuous operation. This study advances the automation in the sustainable production of photoelectrode films and provides inspiration for further developments in the field.","PeriodicalId":72913,"journal":{"name":"Energy advances","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142207340","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Thomas James Leckie, Stuart Duncan Robertson, Edward Brightman
The lithium-sulfur battery (LSB) is a next generation energy storage technology with potential to replace lithium-ion batteries, due to their larger specific capacity, cheaper and safer manufacturing materials, and superior energy density. LSBs are a rapidly progressing topic globally, with around 1800 publications each year and the market is expected to exceed 1.7 billion USD by 2028; as such many novel strategies are being explored to develop and commercialise devices. However, significant technical challenges must be solved to engineer LSBs with commercially viable cycle life, which requires a deeper understanding of the chemical mechanisms occurring within the battery structure. In recent years in situ/operando testing of LSBs has become a popular approach for deciphering the kinetics and mechanisms of their discharge process, which is notoriously complex, and visualising the effects of mass deposition onto the electrodes and how these factors affect the cell’s performance. In this review, in situ and operando studies are discussed in the context of LSBs with particular focus on spectroscopic and morphological techniques in line with trends in the literature. Additionally, some techniques have been covered which have yet to be used widely in the literature but could prove to be invaluable tools for analysis in the future. These in situ/operando techniques are becoming more widely available, and a review is useful both for the research community and industry to help accelerate the commercialisation of this next-generation technology.
{"title":"Recent advances in in situ/operando characterization of lithium sulfur batteries","authors":"Thomas James Leckie, Stuart Duncan Robertson, Edward Brightman","doi":"10.1039/d4ya00416g","DOIUrl":"https://doi.org/10.1039/d4ya00416g","url":null,"abstract":"The lithium-sulfur battery (LSB) is a next generation energy storage technology with potential to replace lithium-ion batteries, due to their larger specific capacity, cheaper and safer manufacturing materials, and superior energy density. LSBs are a rapidly progressing topic globally, with around 1800 publications each year and the market is expected to exceed 1.7 billion USD by 2028; as such many novel strategies are being explored to develop and commercialise devices. However, significant technical challenges must be solved to engineer LSBs with commercially viable cycle life, which requires a deeper understanding of the chemical mechanisms occurring within the battery structure. In recent years in situ/operando testing of LSBs has become a popular approach for deciphering the kinetics and mechanisms of their discharge process, which is notoriously complex, and visualising the effects of mass deposition onto the electrodes and how these factors affect the cell’s performance. In this review, in situ and operando studies are discussed in the context of LSBs with particular focus on spectroscopic and morphological techniques in line with trends in the literature. Additionally, some techniques have been covered which have yet to be used widely in the literature but could prove to be invaluable tools for analysis in the future. These in situ/operando techniques are becoming more widely available, and a review is useful both for the research community and industry to help accelerate the commercialisation of this next-generation technology.","PeriodicalId":72913,"journal":{"name":"Energy advances","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142207342","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：