Nanoscale
·
2023
·Vol. 15
·期 47
·19159-19167
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IF 6.7
Miaoxin Di,Zhenqi Song,Suhua Chen,Ying Bai
Transition metal sulfides (TMSs) have drawn promising attention due to their low cost and high theoretical capacity for sodium storage. However, the critical issues of TMSs with huge volume changes and lower ionic/electronic conductivity are the major challenges for their practical application in sodium-ion batteries. Herein, we constructed cobalt-doped ZnS encapsulated in an N-doped carbon shell (denoted as Co-ZnS@NC), which effectively alleviates the volume expansion and improves sodium storage performance. The mechanism analysis and ion diffusion kinetics analysis (GITT, EIS, and CV) prove the acceleration of Na+ diffusion by the built-in electric field and buffer carbon layer in the Co-ZnS@NC, optimizing the cycle life and rate capability. The as-prepared Co-ZnS@NC has a high reversible capacity of 456.8 mA h g−1 after 1000 cycles at 1.0 A g−1 and superior rate capability (368.8 mA h g−1 at 20.0 A g−1), with Na metal as the counter electrode. Moreover, the assembled full cell shows a high energy density of 214.4 W h kg−1. This work provides insight on heteroatom doping for optimizing the rate capability of TMS anodes.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
FUEL
·
2024
·
IF 6.7
Mengjie Zhang,Xiangpu Jiao,Dezhang Ren,Chenxin Huang,Yang Li,Duofu Chen,Zhibao Huo
The rapid development of the biodiesel industry is of significant importance for achieving carbon emission reduction in the transportation sector. However, the presence of trace amounts of water in the feedstock during biodiesel synthesis may lead to severe saponification reactions, thereby reducing the yield of fatty acid methyl esters. In this study, based on our exploration of the characteristic of porous carbon to absorb moisture from the environment, we synthesized a CaO catalyst with porous carbon coating via discarded shrimp shell biomass. Because the carbonization temperature of organic matter in shrimp shells is lower than the decomposition temperature of CaCO 3 , the CO 2 generated during pyrolysis can erode the pyrolytic carbon and form porous structure. The mesoporous carbon shell facilitates the diffusion of oil and methanol molecules while adsorbing moisture in the alcohol phase. This structure effectively minimizes the interaction between CaO and water, thereby suppressing saponification reactions and ensuring the smooth progression of the desired transesterification reaction. Through a series of physicochemical characterizations, the structure and water absorption performance of the catalyst were confirmed. The as-prepared CaO@PC-900 catalyst demonstrated the ability to maintain a biodiesel yield of over 85% in a reaction system with a water content of 3%, significantly surpassing the performance of commercial CaO and previously reported Ca-based solid bases. This work provides a new approach to the design of anti-saponification transesterification catalysts, while also offering a novel pathway for the synthesis of porous carbon from discarded crustacean biomass.
研究领域:
能源科学
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催化材料
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Yahong Yuan,Jiale Wan,Zhuqing Zhao,Xiang Chen,Shuaibo Gao,Hongwei Xie,Huayi Yin
The utilization of kerf-loss silicon (KL-Si) waste as anode materials in lithium-ion batteries (LIBs) faces limitations of the rapid structural degradation during repeated charging/discharging. To overcome this limitation, 3D carbon-coated Si is constructed to buffer the Si volume expansion caused by the lithiation, while simultaneously forming a robust conductive network. Meanwhile, the well-dispersed porous carbon (C) shell, doped with suitable heteroatoms, plays a pivotal role in facilitating rapid ion transfer rates. In addition, a cobalt (Co) and nitrogen (N)-doped C shell is employed to encapsulate KL-Si, aimed at enhancing its lithium (Li) storage performances. The electrochemical performance of KL-Si@C-ZIF/N/Co composites, synthesized through the encapsulation of KL-Si with a metal-organic framework (MOF) structure (ZIF-90) followed by heat treatment. The resulting composites exhibit an outstanding reversible capacity of 981 mAh g −1 and an impressive capacity retention of 81.9% at 2 A g −1 even after 350 cycles. This paper presents a promising method for maximizing the value-added utilization of KL-Si and reveals the advantages of MOF-derived porous C shell in accommodating the inherent volume expansion of Si-based anodes.
研究领域:
材料科学
·
能源存储技术
✓ 已验证
DOI
高影响因子
ACS Applied Energy Materials
·
2022
·
IF 6.959
Jie-wen Liu,Jian Zhang,Ming-jie Xu,Chuan-jin Tian,Xiao-jun Zeng,Chang-an Wang
Developing highly active and reliable Pt-based catalysts is a major challenge for the widespread commercialization of proton-exchange membrane fuel cells. Herein, we have designed Pt3Co@C hollow sphere catalysts by the template method, in which PtCo alloy nanoparticles of approximately 3 nm diameter are anchored in a porous shell of nitrogen-doped carbon hollow spheres. Due to the confinement effect of the porous carbon shell, PtCo alloy nanoparticles possess excellent resistance to sintering, maintaining 2–3 nm size after calcination at 800 °C. Also, Pt3Co@C hollow sphere catalysts exhibit superior catalytic activity and stability in the oxygen reduction reaction, achieving 3.6 times the mass activity of the corresponding commercial Pt/C catalyst. Such catalysts with a mass activity retention rate of 87% after accelerated durability testing and no significant decay in activity after 10,000 potential cycles. Meanwhile, Pt3Co@C catalysts exhibit extremely high catalytic activity and surprising durability for the hydrogen evolution reaction process over the entire pH range. We believe that this methodology provides an insight into the preparation of high-performance electrocatalysts.
研究领域:
材料科学
·
电化学
·
催化科学
✓ 已验证
产品关联
DOI
高影响因子
ENERGY
·
2024
·
IF 9
Yijiang Wang,Shoujie Guan,Yang Yang,Xun Zhu,Dingding Ye,Rong Chen,Qiang Liao
As a clean and efficient energy generator, enzyme fuel cells are expected to be the next generation of wearable and implantable bioenergy harvestor. The nitrogen-doped hollow carbon shells have been previously proven to be one of the most successful enzymes nanocarriers to increase the direct electron transfer rate between enzymes and electrode. The tightly and uniformly attachment of nanocarriers on the flexible collector still remains a challenge. In this work, we use the hydrothermal method and etching process to prepare the nitrogen-doped polyporous carbon shell frameworks on commercial carbon cloth. The good mechanical properties of the hydrogel ensure that the device can adapt to different stresses and strains generated by individual movement. The open-circuit voltage of the biofuel cell loaded with modified bioanode reaches 0.43 V, the maximum power density is 22 μW cm −2 , which is twice of that using conventional protocals. The long-term power output is kept stably, and its power density has limited fluctuations during the repeated stretching, twisting and washing processes due to tight and uniform connections between flexible current collector and nanocarriers. It provides a continuous stream of energy under practical conditions, proving that the proposed strategy has great potential for developing flexible and stretchable wearable devices.
研究领域:
材料科学
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生物医学工程
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能源技术
✓ 已验证
产品关联
DOI
高影响因子
Journal of Energy Storage
·
2023
·
IF 9.4
Subin Jiang,Xiang Ji,Tengfei Yu,Feng Liu,Meizhen Gao
The suitable proportion of diffusion contribution during the electrochemical process could influence the electrochemical performance of electrode materials. An effective method is that tuning the diffusion reaction contribution via doping heteroatom, introducing defects or surface modification. In this work, a unique core-shell structure material Cu-Mn-Co LDO-C is obtained. Benefitting from Cu pre-doped into Mn Co LDO, large amount of oxygen vacancies is introduced to enhance electrochemical performance; N-6 doped porous carbon shell protects Cu-Mn-Co LDO core and improves electrochemical performance of Cu-Mn-Co LDO-C further. In addition, doping Cu broadens potential window of Cu-Mn-Co LDO-C surprisingly. Cu-Mn-Co LDO-C presents 5028.7 mF cm −2 at a current density of 1 mA cm −2 with a facilely reached potential window of 0–0.65 V finally, and retains 73.4 % diffusion contribution at a scan rate of 1 mV s −1 , 18.3 % at 100 mV s −1 . After 10,000 cycles at 2 mA cm −2 , Cu-Mn-Co LDO-C keeps 90.3 % of initial capacitance. Using Cu-Mn-Co LDO-C as positive and Fe 3 O 4 -C as negative to fabricate a solid flexible asymmetrical supercapacitor (SAS), this SAS presents a considerable energy density that attribute to the high working potential of positive Cu-Mn-Co LDO-C. SAS could working stably at a potential window of 0–2.2 V, and presents the highest energy density 243.1 μWh cm −2 at a power density of 2.8 mW cm −2 , remains 203.0 μWh cm −2 at the highest power density of 55.4 mW cm −2 . A hand ring that was assembled by three SAS which contacted in series could light a highest rated voltage white LED more than 10 min. As a result, Cu-Mn-Co LDO-C is an ideal candidate for flexible positive electrode in the field of smart, portable energy storage.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
Inorganic Chemistry Frontiers
·
2019
·Vol. 6
·期 9
·2550-2557
·
IF 5.934
Weidan Li,Pin Ma,Fanfan Chen,Rui Xu,Zhihai Cheng,Xiong Yin,Yuan Lin,Leyu Wang
Cost-effective, Pt-free catalysts possessing superior electrochemical activity and stability are highly desirable for triiodide reduction reaction in dye-sensitized solar cells (DSCs). Herein, CoSe2 nanoparticles embedded in porous carbon shells (CoSe2/CS) were explored as highly efficient catalysts toward triiodide reduction reaction. The CoSe2/CS composites were fabricated using a soft-template approach involving the carbonization and selenization processes. The CoSe2 nanoparticles were well distributed within highly graphitized nitrogen-doped carbon nanoshells. More importantly, the CoSe2/CS catalysts presented both high catalytic performance and long-term stability, outperforming those of the thermally-deposited Pt electrode. Furthermore, the optimized DSC device with a CoSe2/CS catalyst-based counter electrode showed a power conversion efficiency of 7.54%, exceeding that of the thermally-deposited Pt (7.40%) counterpart. The enhanced catalytic activity, long-term stability and photovoltaic efficiency can be attributed to the much more reaction sites provided by CoSe2 nanoparticles embedded within the porous carbon shells, as well as the better band matching with the potential of the I3−/I− redox couple, revealed by the Kelvin probe force microscope measurement. This work will provide a strategy to construct low-cost, highly efficient and stable non-Pt catalysts for photovoltaic applications.
研究领域:
材料科学
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能源科学
·
催化化学
✓ 已验证
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2019
·
IF 5.383
Tingting Li,Ruisong Guo,Yani Luo,Fuyun Li,Leichao Meng,Xiaohong Sun,Zhiwei Yang,Honglin Luo,Yizao Wan
A three-layer shell structured tungsten disulfide-based material for high capacity anode is prepared by a hydrothermal method . The three layers consist of a stable porous carbon shell (PCS), a tungsten disulfide nanosheet (WS 2 ) and a highly conductive nitrogen-doped graphene (NG). While the nanostructured WS 2 and NG ensured the fast lithium/sodium ions (Li + /Na + ) insertion/extraction, the stable PCS shell provides structural stability during cycling, resulted in the improved rate capability and long cycle life of the PCS/WS 2 /NG anode material. For lithium-ion batteries (LIBs), the capacity of PCS/WS 2 /NG anode is 324.7 mAh g −1 after 510 cycles at a high current density of 2 A g −1 . The discharge capacities of PCS/WS 2 /NG, PCS/WS 2 , WS 2 and PCS anodes are 272.9, 105.1, 8.1 and 6.7 mAh g −1 , respectively, at a high current density of 4 A g −1 . When the current density rebound to 0.1 A g −1 , their capacity retentions are 57.8%, 38.3%, 17.6% and 26.4%, respectively. The capacity retention of PCS/WS 2 /NG anode is 69.6%, higher than that of the pristine WS 2 anode. For sodium-ion batteries (SIBs), PCS/WS 2 /NG anode exhibits a specific capacity of 205.0 mAh g −1 after the 900th cycle at the current density of 0.5 A g −1 . The excellent electrochemical performance of the three-layer shell structured PCS/WS 2 /NG nanomaterial is a promising anode for high performance LIBs and SIBs.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
Inorganic Chemistry Frontiers
·
2024
·
IF 6.1
Han Guo,Guangxu Yao,Chuanzhen Feng,Mi Wang,Huijuan Zhang,Yu Wang
Transition metal oxygen evolution/reduction reaction (ORR/OER) catalysts applied to Zn–air batteries (ZABs) have been extensively investigated, but the problems of transition metal electrocatalysts being prone to agglomeration and deactivation at high temperatures and the insufficient stability of the existing single carbon-based catalysts still exist. Herein, we present a dual-substrate strategy that confines first FeNi alloys in N-doped porous carbon shells and then embeds them onto dual-substrate nanofibers of Ti4O7 and C (FeNi/NC@Ti4O7-CNFs) by electrostatic spinning and annealing treatments. The domain-limiting effect provided by the porous carbon shells disperses the alloys and there is a strong synergy between the alloys and the N-doped carbon shells to modify the electronic structure. Additionally, Ti4O7 has excellent stability even in strongly alkaline environments. Accordingly, abundant M–NX active sites are achieved by the triple synergistic effect of Ti4O7 and C formed dual-substrate nanofibers, N-doped porous carbon shells, and highly dispersed alloys. The prepared FeNi/NC@Ti4O7-CNFs demonstrated a lower ORR and OER potential difference (ΔE = 0.656 V) than Pt/C and RuO2. The liquid ZAB assembled with this catalyst has a cycle life of more than 320 h. This work provides a valuable strategy for developing highly active catalysts for application in advanced electrochemical energy devices.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
DOI
高影响因子
Nano Energy
·
2019
·
IF 15.548
Fu-Ting Wang,Yi-Han Wang,Jing Xu,Ke-Jing Huang,Zhen-hua Liu,Yun-fei Lu,Shu-yu Wang,Zi-wei Han
A self-powered microRNA (miRNA) biosensing device is fabricated with high-energy enzymatic biofuel cell (EBFC) and cruciform DNA (cDNA). Sulfur-selenium co-doped graphene/gold nanoparticles (S–Se-GR/AuNPs) is synthesized and used as supporting substrate of biocathode and bioanode . The glucose oxidase (GOD) molecules are bonded to carboxyl-functionalized AuNPs through the condensation reaction between the amino groups in enzyme and carboxyl groups on the AuNPs to form the bioanode. The ultra-thin porous carbon shell/AuNPs-complementary strand of cDNA (UPCS/AuNPs-cDNA) is meticulously designed. The potassium ferricyanides are then inserted in mesoporous UPCS/AuNPs as the biocathode electron acceptor , and the cruciform DNA bioconjugate is synthesized as signal amplifier. When target miRNA is added, the hybridization reaction happens between miRNA and capture probe DNA on the biocathode to open the capture probe DNA chain. Cruciform DNA bioconjugate is immobilized onto the biocathode through base pairing with the capture DNA on the biocathode, which can release electron acceptor [Fe(CN) 6 ] 3- , resulting in the dramatically increase of the open circuit voltage of the EBFCs. The self-powered biosensor responds linearly in the miRNA level range of 0.5–10000 fM with a detection limit of 1.5 × 10 −16 mol L −1 . Detection of miRNA in spiked serum samples is also realized with the self-powered biosensor, demonstrating its great potential in the clinical applications.
研究领域:
生物工程
·
生物医学工程
·
分析化学
·
分子生物学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）