Pub Date : 2024-12-31DOI: 10.1016/j.electacta.2024.145620
Marek Mooste, Julia Müller-Hülstede, Dana Schonvogel, Tanja Zierdt, Julia Buschermöhle, Killian Fuhrmann, Michaela Wilhelm, Peter Wagner, K. Andreas Friedrich
For addressing the clean energy transition, the high-temperature proton exchange membrane fuel cells (HT-PEMFC) are attractive energy conversion devices for the long-range and heavy-duty vehicles, auxiliary power units, and aviation applications. One current drawback inhibiting HT-PEMFC commercialisation is the need for non-precious metal catalyst (NPMC) for oxygen reduction reaction (ORR) at the cathode. Here we propose the polymer derived ceramics (PDC) based material silicon oxycarbide (SiOC) with double transition metal (TM) doping and N-functionalisation for the NPMC preparation. The catalysts prepared with zeolitic imidazolate framework-8 (ZIF-8) as a N-source exhibited high specific surface area, hierarchical porosity, and presence of TM (alloy) nanoparticles together with atomically dispersed TMs. The highest activity towards the ORR was observed in the case of Fe/Co containing and acid leached catalyst material (CoFe-N-SiOCa) exhibiting the highest long-term durability in 0.5 M H3PO4 solution and the best performance during the GDE testing in conc. H3PO4 at 160 °C. During HT-PEMFC testing, the open circuit voltage of 768 mV and power density at 100 mA cm−2 of 34 mW cm−2 with CoFe-N-SiOCa cathode were registered.
{"title":"Binary transition metal and ZIF-8 functionalised polymer-derived ceramic catalysts for high temperature PEM fuel cell cathode","authors":"Marek Mooste, Julia Müller-Hülstede, Dana Schonvogel, Tanja Zierdt, Julia Buschermöhle, Killian Fuhrmann, Michaela Wilhelm, Peter Wagner, K. Andreas Friedrich","doi":"10.1016/j.electacta.2024.145620","DOIUrl":"https://doi.org/10.1016/j.electacta.2024.145620","url":null,"abstract":"For addressing the clean energy transition, the high-temperature proton exchange membrane fuel cells (HT-PEMFC) are attractive energy conversion devices for the long-range and heavy-duty vehicles, auxiliary power units, and aviation applications. One current drawback inhibiting HT-PEMFC commercialisation is the need for non-precious metal catalyst (NPMC) for oxygen reduction reaction (ORR) at the cathode. Here we propose the polymer derived ceramics (PDC) based material silicon oxycarbide (SiOC) with double transition metal (TM) doping and N-functionalisation for the NPMC preparation. The catalysts prepared with zeolitic imidazolate framework-8 (ZIF-8) as a N-source exhibited high specific surface area, hierarchical porosity, and presence of TM (alloy) nanoparticles together with atomically dispersed TMs. The highest activity towards the ORR was observed in the case of Fe/Co containing and acid leached catalyst material (CoFe-N-SiOCa) exhibiting the highest long-term durability in 0.5 M H<sub>3</sub>PO<sub>4</sub> solution and the best performance during the GDE testing in conc. H<sub>3</sub>PO<sub>4</sub> at 160 °C. During HT-PEMFC testing, the open circuit voltage of 768 mV and power density at 100 mA cm<sup>−2</sup> of 34 mW cm<sup>−2</sup> with CoFe-N-SiOCa cathode were registered.","PeriodicalId":305,"journal":{"name":"Electrochimica Acta","volume":"41 1","pages":""},"PeriodicalIF":6.6,"publicationDate":"2024-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142904982","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-12-31DOI: 10.1016/j.electacta.2024.145627
Heyang Sun, Siyi Hu, Tao Liao, Yang Li, Xiaobin Fan, Wenchao Peng
Single-atom catalysts (SACs) have exhibited great potential for CO2 electroreduction (CO2RR), but designing highly active and cost-effective SACs remains a challenge. In this study, a pyrolysis strategy with space-limiting materials as the precursors is developed to synthesize a highly active Ni-SAs/NC catalyst, and an atomic Ni loading of 2.16 wt% is achieved. The coordination style of Ni atoms is determined to be Ni-N3 by XAS. During the CO2RR test, a CO Faradaic efficiency of 98.21% at -0.8 V vs. RHE can be achieved with a turnover frequency of 2378 h-1. A long-term stability can also be obtained with negligible deactivation in 24 h, surpassing most of previously reported non-noble metal catalysts. In addition, a novel dual-function reaction system was fabricated to integrate CO2RR with electrochemical oxidation processes (EAOPs) for pollutants degradation. With δ-MnO2/NF as the anode, 100% of 40 ppm RhB can be degraded within 30 min in the range of -0.6 V ∼ -1.0 V. This system can thus enable the reduction of CO2 to CO and degradation of pollutants in the anodic cell simultaneously. The introduction of EAOPs as the anodic reaction provides a more cost-effective method for electrochemical CO2 reduction.
{"title":"Single Nickel Atoms Confined in N-Doped Porous Carbon for CO2 Electroreduction Coupled with Pollutants Degradation","authors":"Heyang Sun, Siyi Hu, Tao Liao, Yang Li, Xiaobin Fan, Wenchao Peng","doi":"10.1016/j.electacta.2024.145627","DOIUrl":"https://doi.org/10.1016/j.electacta.2024.145627","url":null,"abstract":"Single-atom catalysts (SACs) have exhibited great potential for CO<sub>2</sub> electroreduction (CO<sub>2</sub>RR), but designing highly active and cost-effective SACs remains a challenge. In this study, a pyrolysis strategy with space-limiting materials as the precursors is developed to synthesize a highly active Ni-SAs/NC catalyst, and an atomic Ni loading of 2.16 wt% is achieved. The coordination style of Ni atoms is determined to be Ni-N<sub>3</sub> by XAS. During the CO<sub>2</sub>RR test, a CO Faradaic efficiency of 98.21% at -0.8 V vs. RHE can be achieved with a turnover frequency of 2378 h<sup>-1</sup>. A long-term stability can also be obtained with negligible deactivation in 24 h, surpassing most of previously reported non-noble metal catalysts. In addition, a novel dual-function reaction system was fabricated to integrate CO<sub>2</sub>RR with electrochemical oxidation processes (EAOPs) for pollutants degradation. With δ-MnO<sub>2</sub>/NF as the anode, 100% of 40 ppm RhB can be degraded within 30 min in the range of -0.6 V ∼ -1.0 V. This system can thus enable the reduction of CO<sub>2</sub> to CO and degradation of pollutants in the anodic cell simultaneously. The introduction of EAOPs as the anodic reaction provides a more cost-effective method for electrochemical CO<sub>2</sub> reduction.","PeriodicalId":305,"journal":{"name":"Electrochimica Acta","volume":"33 1","pages":""},"PeriodicalIF":6.6,"publicationDate":"2024-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142904997","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-12-31DOI: 10.1016/j.electacta.2024.145628
Jaeho Lee, Young-Kyu Han
High-voltage lithium-ion batteries (LIBs) have attracted increasing attention for their high energy density. However, at high voltages, cathode degradation and electrolyte decomposition trigger parasitic side reactions that deteriorate battery cycle performance. These issues have been addressed through various studies on cathode‒electrolyte interphase (CEI)-forming additives. In particular, 2-ethylmethylamino-1,3,2-dioxaphospholane 2-oxide (EMPA), a cyclophosphamide (CPA) CEI-forming additive, has shown excellent capacity retention and battery cycle performance at high voltages when added at only 0.5 vol% in LIB systems. However, the molecular-level understanding of CPA additives remains limited. Here, our first-principles calculations reveal that EMPA oxidizes before the solvent in the electrolyte while also scavenging HF and H2O. Specifically, calculations of the dimerization of asymmetric EMPA trimers, represented by two identical [(EMPA)3OH] species forming a [(EMPA)3OH]2 dimer, imply that after oxidation these two identical EMPA polymers bind very strongly and in very close proximity. This was due to the favorable electrostatic interactions with the more widely distributed polar surface in EMPA, in addition to the small number of carbons in the alkyl groups of the amine moiety in CPA. We suggest that the asymmetry in the alkyl groups of the amine moiety in CPA is closely related to the excellent CEI formation observed in the experimental results.
{"title":"Unveiling the Mechanism of Dense Cathode‒Electrolyte Interphase Formation in Lithium-Ion Batteries Using Cyclophosphamide Additive","authors":"Jaeho Lee, Young-Kyu Han","doi":"10.1016/j.electacta.2024.145628","DOIUrl":"https://doi.org/10.1016/j.electacta.2024.145628","url":null,"abstract":"High-voltage lithium-ion batteries (LIBs) have attracted increasing attention for their high energy density. However, at high voltages, cathode degradation and electrolyte decomposition trigger parasitic side reactions that deteriorate battery cycle performance. These issues have been addressed through various studies on cathode‒electrolyte interphase (CEI)-forming additives. In particular, 2-ethylmethylamino-1,3,2-dioxaphospholane 2-oxide (EMPA), a cyclophosphamide (CPA) CEI-forming additive, has shown excellent capacity retention and battery cycle performance at high voltages when added at only 0.5 vol% in LIB systems. However, the molecular-level understanding of CPA additives remains limited. Here, our first-principles calculations reveal that EMPA oxidizes before the solvent in the electrolyte while also scavenging HF and H<sub>2</sub>O. Specifically, calculations of the dimerization of asymmetric EMPA trimers, represented by two identical [(EMPA)<sub>3</sub>OH] species forming a [(EMPA)<sub>3</sub>OH]<sub>2</sub> dimer, imply that after oxidation these two identical EMPA polymers bind very strongly and in very close proximity. This was due to the favorable electrostatic interactions with the more widely distributed polar surface in EMPA, in addition to the small number of carbons in the alkyl groups of the amine moiety in CPA. We suggest that the asymmetry in the alkyl groups of the amine moiety in CPA is closely related to the excellent CEI formation observed in the experimental results.","PeriodicalId":305,"journal":{"name":"Electrochimica Acta","volume":"10 1","pages":""},"PeriodicalIF":6.6,"publicationDate":"2024-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142904995","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Designing non-Pt-based electrocatalysts with high catalytic activity is challenging but extremely desirable for alkaline hydrogen oxidation reaction (HOR). Herein, we successfully design a nitrogen doped carbon shell coated Ru nanoparticles (Ru@NC) catalyst for efficient alkaline HOR. The obtained Ru@NC exhibits an excellent mass activity of 1.279 mA μgPGM-1, which is 8.1-times, 10.3-times and 3.7-times higher than that of Ru@C, Ru/C and commercial Pt/C. When further employed as the anode catalyst for anion exchange membrane fuel cell (AEMFC), a peak power density of 1.114 W cm-2 can be achieved for Ru@NC. Density functional theory (DFT) calculations and experimental results indicate that the hydroxyl binding energy (OHBE) is continually enhanced on the catalysts due to the encapsulation of carbon shell and nitrogen doping derived from the upshifted d-band center of Ru sites in catalysts, which is responsible for the enhanced alkaline HOR performance.
{"title":"Nitrogen-doped carbon-coated Ru nanoparticles as a highly efficient and stable electrocatalyst for alkaline hydrogen oxidation reaction","authors":"Jianchao Yue, Pengyu Han, Xinyi Yang, Xiaoqin Ma, Yu Zhang, Liqing Wu, Jianchuan Wang, Wei Luo","doi":"10.1016/j.electacta.2024.145623","DOIUrl":"https://doi.org/10.1016/j.electacta.2024.145623","url":null,"abstract":"Designing non-Pt-based electrocatalysts with high catalytic activity is challenging but extremely desirable for alkaline hydrogen oxidation reaction (HOR). Herein, we successfully design a nitrogen doped carbon shell coated Ru nanoparticles (Ru@NC) catalyst for efficient alkaline HOR. The obtained Ru@NC exhibits an excellent mass activity of 1.279 mA μg<sub>PGM</sub><sup>-1</sup>, which is 8.1-times, 10.3-times and 3.7-times higher than that of Ru@C, Ru/C and commercial Pt/C. When further employed as the anode catalyst for anion exchange membrane fuel cell (AEMFC), a peak power density of 1.114 W cm<sup>-2</sup> can be achieved for Ru@NC. Density functional theory (DFT) calculations and experimental results indicate that the hydroxyl binding energy (OHBE) is continually enhanced on the catalysts due to the encapsulation of carbon shell and nitrogen doping derived from the upshifted d-band center of Ru sites in catalysts, which is responsible for the enhanced alkaline HOR performance.","PeriodicalId":305,"journal":{"name":"Electrochimica Acta","volume":"26 1","pages":""},"PeriodicalIF":6.6,"publicationDate":"2024-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142904996","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-12-31DOI: 10.1016/j.electacta.2024.145626
Yanqiu Yu, Chenhan Xiong, Wang Li, Xinming Lian, Huahao Sun, Nan Chen, Guoping Du
Nickel-zinc batteries are emerging as the potential alternative to lithium-ion and lead-acid batteries owing to the high open-circuit voltage, affordability, and eco-friendliness. Nevertheless, the problems of zinc dendrite growth, hydrogen evolution and dissolution passivation in the zinc electrode seriously hinder the commercial application of nickel-zinc batteries. To address these issues, three-dimensional flower-like spherical zinc oxide with exceptional electrochemical performance is successfully synthesized by using a facial solvothermal and calcination method. The three-dimensional flower-like structure provides more reactive sites for the negative active materials, reducing local current density and inhibiting zinc dendrite formation. As a result, three-dimensional flower-like spherical ZnO demonstrates superior electrochemical performance compared to pure ZnO and other spherical ZnO. Even after 1200 cycles, the discharge capacity still remains 500 mAh g-1 at 12C, representing 87% of the initial capacity (570 mAh g-1). Furthermore, the material maintains a relatively flat surface throughout the cycle, preventing the formation of dendrite.
{"title":"Oriented design of three-dimensional flower-like spherical zinc oxide as negative material for dendrite-free and superior stable nickel-zinc secondary batteries","authors":"Yanqiu Yu, Chenhan Xiong, Wang Li, Xinming Lian, Huahao Sun, Nan Chen, Guoping Du","doi":"10.1016/j.electacta.2024.145626","DOIUrl":"https://doi.org/10.1016/j.electacta.2024.145626","url":null,"abstract":"Nickel-zinc batteries are emerging as the potential alternative to lithium-ion and lead-acid batteries owing to the high open-circuit voltage, affordability, and eco-friendliness. Nevertheless, the problems of zinc dendrite growth, hydrogen evolution and dissolution passivation in the zinc electrode seriously hinder the commercial application of nickel-zinc batteries. To address these issues, three-dimensional flower-like spherical zinc oxide with exceptional electrochemical performance is successfully synthesized by using a facial solvothermal and calcination method. The three-dimensional flower-like structure provides more reactive sites for the negative active materials, reducing local current density and inhibiting zinc dendrite formation. As a result, three-dimensional flower-like spherical ZnO demonstrates superior electrochemical performance compared to pure ZnO and other spherical ZnO. Even after 1200 cycles, the discharge capacity still remains 500 mAh g<sup>-1</sup> at 12C, representing 87% of the initial capacity (570 mAh g<sup>-1</sup>). Furthermore, the material maintains a relatively flat surface throughout the cycle, preventing the formation of dendrite.","PeriodicalId":305,"journal":{"name":"Electrochimica Acta","volume":"322 1","pages":""},"PeriodicalIF":6.6,"publicationDate":"2024-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142904998","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-12-31DOI: 10.1016/j.electacta.2024.145621
Shiyu Jia, Ziyang Liu, Yuanpan Gao, Ruoran Zhang, Rui Zhu, Shanshan Gao, Peipei Guan, Xuanran Geng, Ke Tian, Shouli Bai
The design of photoanode materials to achieve efficient water splitting is a current research hotspot in photoelectrochemical (PEC). In this work, we designed and prepared an α-Fe2O3/BiVO4 heterostructure modified by carbon quantum dots ((α-Fe2O3/BiVO4/CQDs)) as the photoanode. The modification of CQDs can broaden the sunlight absorption ability and dramatically enhance the water oxidation kinetics of α-Fe2O3/BiVO4/CQDs. The optimized photoanode demonstrated a photocurrent density of 1.32 mA cm−2 at 1.23 V vs. RHE, which is 2.2 times than pristine α-Fe2O3 (0.6 mA cm−2) photoanode. The IPCE value above 29.4% at 400 nm, and the onset potential is negatively shifted by 243 mV for α-Fe2O3/BiVO4/CQDs. The improved performance is mainly due to the α-Fe2O3/BiVO4 heterojunction to achieve effective separation of photogenerated carriers in the bulk phase and CQDs to improve light utilisation and OER kinetics of the photoanode.
{"title":"Carbon quantum dots (CQDs) modified α-Fe2O3/BiVO4 heterojunction photoanode for enhancing photoelectrochemical water splitting","authors":"Shiyu Jia, Ziyang Liu, Yuanpan Gao, Ruoran Zhang, Rui Zhu, Shanshan Gao, Peipei Guan, Xuanran Geng, Ke Tian, Shouli Bai","doi":"10.1016/j.electacta.2024.145621","DOIUrl":"https://doi.org/10.1016/j.electacta.2024.145621","url":null,"abstract":"The design of photoanode materials to achieve efficient water splitting is a current research hotspot in photoelectrochemical (PEC). In this work, we designed and prepared an α-Fe<sub>2</sub>O<sub>3</sub>/BiVO<sub>4</sub> heterostructure modified by carbon quantum dots ((α-Fe<sub>2</sub>O<sub>3</sub>/BiVO<sub>4</sub>/CQDs)) as the photoanode. The modification of CQDs can broaden the sunlight absorption ability and dramatically enhance the water oxidation kinetics of α-Fe<sub>2</sub>O<sub>3</sub>/BiVO<sub>4</sub>/CQDs. The optimized photoanode demonstrated a photocurrent density of 1.32 mA cm<sup>−2</sup> at 1.23 V vs. RHE, which is 2.2 times than pristine α-Fe<sub>2</sub>O<sub>3</sub> (0.6 mA cm<sup>−2</sup>) photoanode. The IPCE value above 29.4% at 400 nm, and the onset potential is negatively shifted by 243 mV for α-Fe<sub>2</sub>O<sub>3</sub>/BiVO<sub>4</sub>/CQDs. The improved performance is mainly due to the α-Fe<sub>2</sub>O<sub>3</sub>/BiVO<sub>4</sub> heterojunction to achieve effective separation of photogenerated carriers in the bulk phase and CQDs to improve light utilisation and OER kinetics of the photoanode.","PeriodicalId":305,"journal":{"name":"Electrochimica Acta","volume":"83 1","pages":""},"PeriodicalIF":6.6,"publicationDate":"2024-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142908541","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-12-31DOI: 10.1016/j.electacta.2024.145590
Wenyu Zhang, Xuefeng Liu, Xiaowen Li, Yanhua Ding, Guangyin Liu, Linbo Li, Shouyu Yang, Dan Zhang, Yan Yang, Jinbing Cheng
It is crucial to explore new anode materials with outstanding electrochemical properties for the development of lithium-ion batteries (LIBs). Nb2O5 is considered a promising anode material for LIBs owing to its rich redox chemistry (Nb5+ ∼ Nb3+), excellent rate performance and durability over long-term cycling. Nevertheless, its practical application is restricted by its low electrical conductivity. In this study, phosphorus-doped Nb2O5 (P-Nb2O5) with an urchin-like structure was prepared through hydrothermal method and subsequent low-temperature phosphorization, utilizing sodium hypophosphite monohydrate as the phosphorus source. Such urchin-like P-Nb2O5 exhibits outstanding high-rate capacity up to 137 mAh g-1 at 20 C, and exceptional cycling stability of 147 mAh g-1 at 10 C after 500 cycles. Furthermore, the excellent electrochemical performance is also verified in LiNi0.5Mn0.3Co0.2O2//P-Nb2O5 full cell, such as good rate capability (89 mAh g-1 at 10 C), and superior cyclability (capacity retention of 93.9% at 5 C after 1000 cycles). The superior performance of the P-Nb2O5 anode can be ascribed to its urchin-like structure and P-doping modification, which helps to inspire more thoughts on the synergistic design of Nb2O5 molecules and structure engineering.
{"title":"Phosphorus-doped urchin-like Nb2O5 microspheres as stabilised anodes for lithium-ion batteries with excellent rate performance","authors":"Wenyu Zhang, Xuefeng Liu, Xiaowen Li, Yanhua Ding, Guangyin Liu, Linbo Li, Shouyu Yang, Dan Zhang, Yan Yang, Jinbing Cheng","doi":"10.1016/j.electacta.2024.145590","DOIUrl":"https://doi.org/10.1016/j.electacta.2024.145590","url":null,"abstract":"It is crucial to explore new anode materials with outstanding electrochemical properties for the development of lithium-ion batteries (LIBs). Nb<sub>2</sub>O<sub>5</sub> is considered a promising anode material for LIBs owing to its rich redox chemistry (Nb<sup>5+</sup> ∼ Nb<sup>3+</sup>), excellent rate performance and durability over long-term cycling. Nevertheless, its practical application is restricted by its low electrical conductivity. In this study, phosphorus-doped Nb<sub>2</sub>O<sub>5</sub> (P-Nb<sub>2</sub>O<sub>5</sub>) with an urchin-like structure was prepared through hydrothermal method and subsequent low-temperature phosphorization, utilizing sodium hypophosphite monohydrate as the phosphorus source. Such urchin-like P-Nb<sub>2</sub>O<sub>5</sub> exhibits outstanding high-rate capacity up to 137 mAh g<sup>-1</sup> at 20 C, and exceptional cycling stability of 147 mAh g<sup>-1</sup> at 10 C after 500 cycles. Furthermore, the excellent electrochemical performance is also verified in LiNi<sub>0.5</sub>Mn<sub>0.3</sub>Co<sub>0.2</sub>O<sub>2</sub>//P-Nb<sub>2</sub>O<sub>5</sub> full cell, such as good rate capability (89 mAh g<sup>-1</sup> at 10 C), and superior cyclability (capacity retention of 93.9% at 5 C after 1000 cycles). The superior performance of the P-Nb<sub>2</sub>O<sub>5</sub> anode can be ascribed to its urchin-like structure and P-doping modification, which helps to inspire more thoughts on the synergistic design of Nb<sub>2</sub>O<sub>5</sub> molecules and structure engineering.","PeriodicalId":305,"journal":{"name":"Electrochimica Acta","volume":"13 1","pages":""},"PeriodicalIF":6.6,"publicationDate":"2024-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142904983","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-12-31DOI: 10.1016/j.electacta.2024.145599
Wangdong Lu, Pengjuan Ni, Haichao Dai, Guoxin Wu, Zhuang Li
The detection of disease biomarkers has caused for public concerns. Hydrogen peroxide and glucose are important biomarkers for human health. In the study, we fabricate bifunctional nonenzymatic biosensor for the detection of hydrogen peroxide and glucose based on screwed-shaped Cu nanorods decorated Cu foam (denoted as Cu2O SNRs@Cu foam) by anodization and heat treatment. In addition, the sensors show good sensitivity, wide linear range and low detection limit for the detection of hydrogen peroxide and glucose. The designed Cu2O SNRs@Cu foam in this study provides a new binder-free electrode material to construct electrochemical sensors with good electrocatalytic performances to detect other biological molecules and holds promise for practical application in the field of health monitoring.
{"title":"Screwed-Shaped Cuprous Oxide Nanorods Arrays as Bifunctional Nonenzymatic Sensor for Hydrogen Peroxide and Glucose Recognition","authors":"Wangdong Lu, Pengjuan Ni, Haichao Dai, Guoxin Wu, Zhuang Li","doi":"10.1016/j.electacta.2024.145599","DOIUrl":"https://doi.org/10.1016/j.electacta.2024.145599","url":null,"abstract":"The detection of disease biomarkers has caused for public concerns. Hydrogen peroxide and glucose are important biomarkers for human health. In the study, we fabricate bifunctional nonenzymatic biosensor for the detection of hydrogen peroxide and glucose based on screwed-shaped Cu nanorods decorated Cu foam (denoted as Cu<sub>2</sub>O SNRs@Cu foam) by anodization and heat treatment. In addition, the sensors show good sensitivity, wide linear range and low detection limit for the detection of hydrogen peroxide and glucose. The designed Cu<sub>2</sub>O SNRs@Cu foam in this study provides a new binder-free electrode material to construct electrochemical sensors with good electrocatalytic performances to detect other biological molecules and holds promise for practical application in the field of health monitoring.","PeriodicalId":305,"journal":{"name":"Electrochimica Acta","volume":"13 1","pages":""},"PeriodicalIF":6.6,"publicationDate":"2024-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142908571","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-12-31DOI: 10.1016/j.electacta.2024.145624
Kangcheng Wang, Kai Wei, Xian Wang, Junjie Ge
Single-atom catalysts (SACs) have received extensive attention in various fields owing to the high density of catalytically active sites and high metal utilization. With the development of SACs, metal high-loading in SACs has become one of the research directions for researchers. In providing a higher density of active sites, high-loading SACs also offer a more unique catalytic mechanism. In this review, the chemical natures of high-loading SACs are summarized, while their various synthesis strategies. Meanwhile, the application of high-loading SACs in electrocatalytic in recent years is discussed, and their advantages in various electrocatalytic processes, such as the hydrogen evolution reaction (HER), oxygen evolution reaction (OER), oxygen reduction reaction (ORR) and so on, are presented. Eventually, some of the current challenges and future prospects in developing highly loaded SACs are outline.
{"title":"High-loading single-atom catalysts for electrocatalytic applications","authors":"Kangcheng Wang, Kai Wei, Xian Wang, Junjie Ge","doi":"10.1016/j.electacta.2024.145624","DOIUrl":"https://doi.org/10.1016/j.electacta.2024.145624","url":null,"abstract":"Single-atom catalysts (SACs) have received extensive attention in various fields owing to the high density of catalytically active sites and high metal utilization. With the development of SACs, metal high-loading in SACs has become one of the research directions for researchers. In providing a higher density of active sites, high-loading SACs also offer a more unique catalytic mechanism. In this review, the chemical natures of high-loading SACs are summarized, while their various synthesis strategies. Meanwhile, the application of high-loading SACs in electrocatalytic in recent years is discussed, and their advantages in various electrocatalytic processes, such as the hydrogen evolution reaction (HER), oxygen evolution reaction (OER), oxygen reduction reaction (ORR) and so on, are presented. Eventually, some of the current challenges and future prospects in developing highly loaded SACs are outline.","PeriodicalId":305,"journal":{"name":"Electrochimica Acta","volume":"67 1","pages":""},"PeriodicalIF":6.6,"publicationDate":"2024-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142905000","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-12-30DOI: 10.1016/j.electacta.2024.145616
Jia Li, Yucong Chen, Hongjie Chen, Junyang Chen, Weitao Chen, Yixuan Su, Francis Chi-Chun Ling, Qiang Ru
O3-type layered metal oxide cathode manifests conspicuous virtues of high specific capacity and low preparation cost, which has promising commercial prospects. When exposed to moisture or air condition, the cathode usually suffers from irreversible phase transition, surface corrosion, gas generation and other defects. Herein, Cu-doped NaNi1/3Fe1/3Mn1/3O2 is prepared by multi-step tactics. The experimental results show that NaCu0.004Ni0.329Fe1/3Mn1/3O2 exhibits a high discharge capacity of 140 mAh g−1 at 100 mA g−1, and retains 90% capacity retention over100 cycles at 100mA g−1. Galvanostatic intermittent titration technique (GITT) results reveal that the Na+ diffusion coefficient is well enhanced by Cu-doping. Cu-doping enlarges the interlayer spacing and facilitates Na⁺ diffusion, and Cu2+ has partially changed Mn3+ into Mn4+, thereby augmenting Na-storage capability and capacity retention. These findings provide ideas for trace doping of layered oxides as cathode and represent a further step in the development of sodium ion batteries.
{"title":"Facile multi-step tactics to harvest copper-doped O3-type layered NaNi1/3Fe1/3Mn1/3O2 and mitigate capacity decay","authors":"Jia Li, Yucong Chen, Hongjie Chen, Junyang Chen, Weitao Chen, Yixuan Su, Francis Chi-Chun Ling, Qiang Ru","doi":"10.1016/j.electacta.2024.145616","DOIUrl":"https://doi.org/10.1016/j.electacta.2024.145616","url":null,"abstract":"O3-type layered metal oxide cathode manifests conspicuous virtues of high specific capacity and low preparation cost, which has promising commercial prospects. When exposed to moisture or air condition, the cathode usually suffers from irreversible phase transition, surface corrosion, gas generation and other defects. Herein, Cu-doped NaNi<sub>1/3</sub>Fe<sub>1/3</sub>Mn<sub>1/3</sub>O<sub>2</sub> is prepared by multi-step tactics. The experimental results show that NaCu<sub>0.004</sub>Ni<sub>0.329</sub>Fe<sub>1/3</sub>Mn<sub>1/3</sub>O<sub>2</sub> exhibits a high discharge capacity of 140 mAh g<sup>−1</sup> at 100 mA g<sup>−1</sup>, and retains 90% capacity retention over100 cycles at 100mA g<sup>−1</sup>. Galvanostatic intermittent titration technique (GITT) results reveal that the Na<sup>+</sup> diffusion coefficient is well enhanced by Cu-doping. Cu-doping enlarges the interlayer spacing and facilitates Na⁺ diffusion, and Cu<sup>2+</sup> has partially changed Mn<sup>3+</sup> into Mn<sup>4+</sup>, thereby augmenting Na-storage capability and capacity retention. These findings provide ideas for trace doping of layered oxides as cathode and represent a further step in the development of sodium ion batteries.","PeriodicalId":305,"journal":{"name":"Electrochimica Acta","volume":"202 1","pages":""},"PeriodicalIF":6.6,"publicationDate":"2024-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142901857","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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