ChemSusChem
·
2017
·Vol. 10
·期 7
·1385-1389
·
IF 7.226
Hao Wan,Ya Mao,Zixuan Liu,Qingyou Bai,Zhe Peng,Jingjing Bao,Gang Wu,Yang Liu,Deyu Wang,Jingying Xie
As the first step during discharge, the mass transfer of oxygen should play a crucial role in Li–air batteries to tailor the growth of discharge products, however, not enough attention has been paid to this issue. Herein, we introduce an oxygen-enriching cosolvent, 1,2-(1,1,2,2-tetrafluoroethoxy) ethane (FE1), into the electrolyte, and investigate its influence on the discharge performance. The incorporation of this novel cosolvent consistently enhances the oxygen solubility of the electrolyte, and improves the oxygen diffusivity following a volcano-shape trend peaking at 50 % FE1. It is interesting that the discharge capacities obtained with the investigated electrolytes share the similar volcano trends as the oxygen transport under 50 mA g carbon −1 and higher current densities. The improved oxygen diffusion could benefit the volumetric utilization of the air cathode, especially at the separator side, probably owing to the fast oxygen transport to moderate its concentration gradient. Our results demonstrate the importance of oxygen provision, which easily becomes the capacity-determining factor. Graphical Got Oxygen? The enhancement of oxygen provision is achieved by incorporating 1,2-(1,1,2,2-tetrafluoroethoxy) ethane as the cosolvent in the electrolyte. The oxygen's diffusivity, rather than solubility, exerts the principal effect on discharge performance of the Li–air battery, especially at higher current density, owing to the ameliorated oxygen's accessibility, which improves the utilization ratio of the whole air cathode.
研究领域:
电化学
·
能源材料
·
电池技术
·
纳米材料
·
物理化学
·
先进储能系统
✓ 已验证
DOI
高影响因子
MICROCHIMICA ACTA
·
2019
·Vol. 187
·期 1
·1-9
·
IF 5.479
Lin Fangyuan,Lai Zhiwei,Zhang Linchun,Huang Yipeng,Li Feiming,Chen Pingyun,Wang Yiru,Chen Xi
Manganese(II)-doped zinc sulfide nanocrystals (Mn:ZnS NCs) with dual-emission fluorescence (peaks at 445 nm and 590 nm under 330 nm excitation), good water stability and low toxicity were synthesized by hot injection. The fluorescence intensity of both emission bands of the nanocrystals can change rapidly by the content of gaseous and dissolved oxygen. The process is fully reversible. Compared with the maximum intensity of Mn:ZnS sensing film in 100% nitrogen, the emission of the blue emission decreases by 72% in the presence of 100% oxygen, and the yellow emission by 32%. Response is linear in the presence of 3% to 12% of oxygen percentage in gas. For water-dissolved oxygen, the linear response occurs between 0.54 and 11.4 mg·L −1 .
Mn-doped ZnS NCs with dual-emission fluorescence were synthesized by hot-injection method. The reversible and rapid sensing characteristics of Mn-doped ZnS NCs to oxygen were studied, and the possible sensing mechanism was investigated.
研究领域:
材料科学
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Nano
·
2017
·
IF 13.942
Jie Yin,Yuxuan Li,Fan Lv,Qiaohui Fan,Yong-Qing Zhao,Qiaolan Zhang,Wei Wang,Fangyi Cheng,Pinxian Xi,Shaojun Guo
The development of highly efficient bifunctional catalysts for oxygen evolution reaction (OER) and oxygen reduction reaction (ORR) is crucial for improving the efficiency of the Zn–air battery. Herein, we report porous NiO/CoN interface nanowire arrays (PINWs) with both oxygen vacancies and a strongly interconnected nanointerface between NiO and CoN domains for promoting the electrocatalytic performance and stability for OER and ORR. Extended X-ray absorption fine structure spectroscopy, electron spin resonance, and high-resolution transmission electron microscopy investigations demonstrate that the decrease of the coordination number for cobalt, the enhanced oxygen vacancies on the NiO/CoN nanointerface, and strongly coupled nanointerface between NiO and CoN domains are responsible for the good bifunctional electrocatalytic performance of NiO/CoN PINWs. The primary Zn–air batteries, using NiO/CoN PINWs as an air–cathode, display an open-circuit potential of 1.46 V, a high power density of 79.6 mW cm–2, and an energy density of 945 Wh kg–1. The three-series solid batteries fabricated by NiO/CoN PINWs can support a timer to work for more than 12 h. This work demonstrates the importance of interface coupling and oxygen vacancies in the development of high-performance Zn–air batteries.
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
ChemCatChem
·
2021
·Vol. 14
·期 4
·e202101523
·
IF 5.686
Yanping Liu,Bin Qiao,Nan Jia,Shufeng Shi,Xinbing Chen,Zhongwei An,Pei Chen
Graphical Rechargeable batteries : N-doped carbon nanoflower with embedded Fe 3 O 4 −Vo nanoparticles was successfully prepared by a facile and scalable method. This material which showed excellent ORR/OER activity and performance in zinc-air battery. Experiment and density functional theory results demonstrate that the high catalytic activity is primarily due to the surface oxygen vacancy of Fe 3 O 4 nanoparticles. The development of low-cost, high-activity bifunctional oxygen electrocatalysts for rechargeable zinc–air batteries is highly desired. Herein, N-doped carbon nanoflower embedded Fe 3 O 4 nanoparticles were prepared using a simple and scalable method. The obtained electrocatalyst exhibits excellent activity and stability toward both oxygen reduction reaction (ORR) and oxygen evolution reaction (OER), as well as a small potential gap of 0.72 V between the half-wave potential of ORR and the onset potential of OER potential, which is superior to the most previously reported bifunctional ORR/OER catalysts. The corresponding zinc–air battery exhibits good charged/discharge cycle performance as well as excellent discharge property, with a power density of 136.8 mW cm −2 at 200 mA cm −2 outperforming commercial Pt/C (96.5mW cm −2 ). Experiment results and density functional theory demonstrate that the high catalysis activity is mainly caused by the surface oxygen vacancy of Fe 3 O 4 nanoparticles. This study sheds new light on the ORR/OER bifunctional electrocatalyst design.
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
NEW JOURNAL OF CHEMISTRY
·
2020
·Vol. 44
·期 15
·6003-6009
·
IF 3.288
Yuhang Jiang,Qiuwan Shen,Shian Li,Guogang Yang,Naibao Huang
B-site cobalt-doped perovskite oxide BaNiO3 oxygen sorbents have been synthesized by an EDTA sol–gel method and further applied for producing oxygen. BaCoxNi1−xO3−δ oxygen sorbents were characterized by scanning electron microscopy (SEM) and cyclic oxygen adsorption/desorption experiments. Results showed that BaCo0.6Ni0.4O3−δ features higher production amounts of oxygen among the candidates. The operating factors of oxygen releasing performance were investigated in detail including adsorption temperature, desorption temperature, adsorption time, CO2 flow rate and CO2 partial pressure. It was concluded that the temperature and CO2 flow rate are the main reasons affecting the performance of perovskite oxygen sorbents. The optimal operating parameters of oxygen releasing performance for BaCo0.6Ni0.4O3−δ were as follows: adsorption temperature was 850 °C, desorption temperature was 850 °C, air adsorption time was 30 min, CO2 flow was 200 ml min−1 and the ratio of CO2/N2 was 100 : 0. The oxygen production amount of BaCo0.6Ni0.4O3−δ was 49.5 mg g−1 under the optimal reaction conditions. Finally, multiple cycles demonstrated that BaCo0.6Ni0.4O3−δ displays higher stability and regeneration capacity, which is the key factor providing a stable O2/CO2 gas stream for oxyfuel combustion application.
研究领域:
材料科学
·
无机化学
·
能源化学
·
化学工程
·
功能材料
✓ 已验证
DOI
高影响因子
ENERGY
·
2024
·
IF 9
Yuxuan Xing,Jingchun Huang,Zhenqi Wang,Wei Hu,Minghou Xu,Yu Qiao
This study focused on the effect of oxygen (0–15 %) and 5 % CaO addition on the organic-S control and transformation behavior during pyrolysis (400–600 °C) of sludge under the conditions relevant to smoldering combustion. The results show that oxygen inhibits the total emission of gaseous sulfur (decreased by 25.6–36.9 %). At low temperatures (<500 °C), oxygen enhances the oxidation of aliphatic-S, aromatic-S/thiophene-S, and sulfide-S, leading more sulfur retains in the form of sulfone-S and sulfate-S in char products, also migrates to water-soluble products (especially sulfone-S). At high temperatures (>500 °C), the formed sulfur species in char products mainly further decompose into water-soluble sulfone-S, and partially generate SO 2 . After the addition of CaO during oxidative pyrolysis, the synergistic promotion effect on the sulfur fixation in char products is found, mainly due to the generation of more amount of stable sulfone-S and sulfate-S in char products. This leads to a decrease in gaseous sulfur by 12.4–14.6 % and an increase in sulfur content of char products by 31.3–202.9 %.
研究领域:
环境科学
·
能源工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CATALYSIS
·
2019
·
IF 7.723
Min Li,Fang Luo,Quan Zhang,Zehui Yang,Zhikun Xu
Stable and efficient bifunctional electrocatalyst for air electrode is still of challenge for rechargeable zinc-air batteries (ZABs). Here, we report an atomic layer oxygen defect cobalt oxides (Co 3 O 4-x ) nanosheets (1 nm) as efficient electrocatalyst for oxygen reduction reaction (ORR) and oxygen evolution reaction (OER). Due to the atomic layer nanosheets, more oxygen defects are formed during plasma treatment enabling effective OER catalysis with overpotential of only 309 mV, which is lower compared to benchmarking IrO 2 (313 mV). Meanwhile, a Pt-like ORR activity is achieved for Co 3 O 4-x due to the atomic layer nanosheets with highly exposed active sites and loosened binding strength between Co 3+ and O 2 /OH − . The battery performance of Co 3 O 4-x nanosheets is 1.7 times higher than that of Pt/C-IrO 2 based ZABs. Besides, Co 3 O 4-x nanosheets exhibit undetectable degradation in battery performance after galvanostatic discharge-charge with 5 mA cm −2 for 150 h implying the superior stability of the atomic layer Co 3 O 4-x nanosheets. All-solid-sate ZABs fabricated from Co 3 O 4-x nanosheets perform an impressive power density of 57 mW cm −2 and stable galvanostatic discharge-charge voltage for 2 h demonstrating that Co 3 O 4-x nanosheets can be utilized as air electrode for practical application.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
Advanced Materials Interfaces
·
2022
·Vol. 10
·期 4
·2201817
·
IF 6.389
Junfeng Zhang,Haotian Liu,Weikang Zhu,Bin Chen,Runfei Yue,Shuoyao Yin,Na Xie,Ran Li,Yan Yin
The design of the efficient, flexible air electrode for enhancing the Zn-air batteries (ZABs) performance is vital in developing a new portable rechargeable power supply. Emerging research indicates that non-precious metal materials have promising activity for oxygen reduction/evolution in alkaline conditions while constructing a high-performance and reliable electrode is still a big challenge at the present stage. In this work, a bimetal doped zeolitic imidazolate framework (ZIF) film is synthesized by fast current-driven synthesis (FCDS) on a thin carbon nanotube film (CNTF). After carbonization at 950 °C, CoFe-N-C nanofoam formed on the CNTF, resulting in binder-free, flexible electrodes. It exhibits excellent activity and stability toward oxygen reduction and evolution. The CoFe-N-C/CNTF-based liquid-state ZAB shows an output power density of 294 mW cm −2 . When applied in solid-state ZAB, the flexible battery shows high power density and excellent cycling stability.
研究领域:
材料科学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
Small
·
2023
·
IF 13.3
Qingsong Ye,Deyuan Zheng,Kaiyuan Chen,Haiheng Xu,Zefeng Yang,Jiqiu Wen,Yiqiao Hu,Jinhui Wu
Stroke is the second leading cause of death worldwide, and hypoxia is a major crisis of the brain after stroke. Therefore, providing oxygen to the brain microenvironment can effectively protect neurons from damage caused by cerebral hypoxia. However, there is a lack of timely and effective means of oxygen delivery clinically to the brain for acute cerebral hypoxia. Here, a phase-change based nano oxygen carrier is reported, which can undergo a phase change in response to increasing temperature in the brain, leading to oxygen release. The nano oxygen carrier demonstrate intracerebral oxygen delivery capacity and is able to release oxygen in the hypoxic and inflammatory region of the brain. In the acute ischemic stroke mouse model, the nano oxygen carrier can effectively reduce the area of cerebral infarction and decrease the level of inflammation triggered by cerebral hypoxia. By taking advantage of the increase in temperature during cerebral hypoxia, phase-change oxygen carrier proposes a new intracerebral oxygen delivery strategy for reducing acute cerebral hypoxia.
研究领域:
神经科学
·
纳米技术
·
药学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2021
·
IF 4.464
Shanhua Chen,Yanqing Huang,Ming Li,Panpan Sun,Xiaowei Lv,Bing Li,Liang Fang,Xiaohua Sun
Currently, development of OER/ORR bifunctional electric catalysts with low cost, high catalytic activity and stability is the key step to promote the practical application of zinc-air batteries. Herein, composite catalyst with manganese oxide on N and O co-doped carbon nanotubes encapsulated with FeCo alloy (CoFe@CNT/MnO) was prepared in situ on CFP by hydrothermal and CVD pyrolysis methods. Owing to rich C O functional group on in situ growing carbon nanotubes with 3D open structure, alloying effect of CoFe core metal embedded in carbon nanotube and the contribution of MnO supported on carbon nanotubes to ORR performance and stability, the CoFe@CNT/MnO catalyst exhibits low overpotential of 193 mV at the current density of 10 mA/cm 2 for OER, larger diffusion-limited current density of 5.75 mA/cm 2 and half-wave potential (E 1/2 = 0.85 V) for ORR, high specific capacity (810 mAh/g Zn ) and peak power density (164 mW/cm 2 ) with the Zn-air battery and superior stability. Moreover, the peak power density of the single CoFe@CNT/MnO-based quasi-solid state ZAB could reach 142 mW/cm 2 , and two quasi-solid state ZABs connected in series can power a mini fan.
研究领域:
材料科学
·
电化学
·
能源存储与转换
✓ 已验证
DOI
高影响因子
VACUUM
·
2021
·
IF 3.627
Zhiruo Shen,Changhua Xu,Sumin Wang,Jian Chen,Siqin Jia,Qiguan Wang
Electrolysis of water is a promising method for production of the green-energy hydrogen, which is commonly assisted by high powerful catalyst. At present, developing low-cost and highly efficient electrocatalysts has attracted increasing attention. Herein, a novel composited catalyst of Zn x Ni 1-x S@Mo 2 C loaded on conductive carbon cloth (Zn x Ni 1-x S@Mo 2 C/CC) is successfully prepared by the hydrothermal method . Due to the abundant active sites of defect structures induced by the surface engineering, the prepared Zn x Ni 1-x S@Mo 2 C/CC shows outstanding electrocatalytic performances in hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) of water splitting, with low overpotential of 230 mV and 150 mV at 10 mA cm −2 , respectively. The Zn x Ni 1-x S@Mo 2 C/CC as an OER/HER bifunctional catalyst for overall water splitting affords a stable voltage of 1.56 V @current density of 10 mA cm −2 . Moreover, the catalyst shows an outstanding stability after a series of electrochemical tests. This work expands the multi-field applications of carbon cloth-supported materials as efficient non-precious metal-based electrocatalysts , with great importance in sustainable energy-relative technologies.
研究领域:
材料科学
·
能源技术
✓ 已验证
产品关联
DOI
高影响因子
Catalysis Science & Technology
·
2019
·Vol. 9
·期 12
·3270-3278
·
IF 5.726
Dan Liu,Chengwei Qiu,Minbo Li,Yanyu Xie,Lu Chen,Huaxiang Lin,Jinlin Long,Zizhong Zhang,Xuxu Wang
Kornblum oxidation (benzyl bromide to benzaldehyde) can be realized efficiently by NaOH-modified graphitic carbon nitride (g-C3N4). Different from the oxidation reaction carried out at high temperature using DMSO as an oxidant, our reaction is eco-friendly because it is carried out at room temperature under LED light irradiation using molecular oxygen as an oxidant, which avoids the problems of toxicity, pollution and purification. Alkali treatment leads to the surface deprotonation of g-C3N4 to form NaOH-modified g-C3N4 (Na/g-C3N4). The modifications of the electronic structure and surface chemical environment of g-C3N4 facilitate light absorption and formation of ˙O2− and therefore make the conversion of benzyl bromide reach up to 99%. This work demonstrates a green and sustainable route for benzaldehyde production and the superiority of g-C3N4 for organic syntheses.
研究领域:
有机化学
·
环境科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）