JOURNAL OF SOLID STATE ELECTROCHEMISTRY
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2015
·Vol. 19
·期 8
·2421-2429
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IF 2.446
Wang Xiaofei,Cai Shengrong,Zhu Ding,Mu Shijia,Chen Yungui
A lithium (Li)–oxygen (O 2 ) battery based on an inorganic solid-state air cathode was fabricated, and the influence of water vapor (key component in the air) on the electrochemical behavior of the proposed Li–O 2 battery was deeply investigated. Excluding the negative influence of the corrosion of Li anode that existed in organic-based electrolyte Li–O 2 battery when operated in wet environment, our results showed that water vapor has a positive effect on the discharge and cycling performances of the Li–O 2 battery using a solid-state air cathode. The discharge capacity reached 11734 mA h g −1 (7.8 mA h cm −2 ) in wet O 2 , which was not markedly different with that in dry O 2 (11956 mA h g −1 (8.0 mA h cm −2 )). However, the discharge voltage in wet O 2 was about 110 mV higher than that in dry O 2 . Although the formation of LiOH increased the charge overpotential, the formed LiOH in turn minimized the decomposition of carbon to form Li 2 CO 3 , and enhanced the cycling performance to a certain extent. In addition, we showed that the polarization involved by water vapor could also be largely decreased by slightly increasing the operating temperature; the charge voltage plateau decreased from 4.04 to 3.3 V when the temperature increased from 25 to 50 °C. These results suggest that the Li–O 2 battery using a solid-state air cathode is promising for practical application, especially in wet environment.
研究领域:
材料科学
·
电化学
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CHEMICAL ENGINEERING JOURNAL
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2017
·
IF 6.216
Fan Yang,Tian Qiu,Cheng Chi,Shuang Liang,Lei Deng,Xuyang Wang,Chunxia Wang,Jingyi Fu,Ying Wang,Yongfeng Li
Promotion of nitrogen-doped graphene (NG) by incorporation of ferric oxide (NG-Fe 2 O 3 ) is found to strongly enhance the activity in the catalytic oxidization of aldehyde to synthesize carboxylic acid with O 2 . The composite NG-Fe 2 O 3 catalysts can be fabricated by a facile one-pot hydrothermal method. The characterization results of the composite catalysts have revealed that the Fe 2 O 3 nanoparticles (NPs) with sizes of 40–90 nm are not only on both sides of NG sheets but also tightly enwrapped by the graphene layers. In comparison to NG and Fe 2 O 3 NPs, synergistic adsorption that confirmed by DFT studies has been created on the NG-Fe 2 O 3 composites, where both NG and Fe 2 O 3 are proposed to be involved in the adsorptive interaction. The synergistic adsorption can lead to strengthen O 2 molecule adsorption of NG and weaken O 2 molecule adsorption of Fe 2 O 3 NPs. More importantly, the NG-Fe 2 O 3 composite is found to considerably facilitate the longest elongation of O-O bonds and contribute to the striking enhancement of the catalytic performance. The highly active NG-Fe 2 O 3 composite shows wide scope for catalysis of oxidation of aldehydes to carboxylic acids and good stability for recycle six times.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2023
·
IF 6.2
Weixue Yang,Jiaqi Zhao,Zhen Li,Jiayu Xin,Fei Li,Yu Wang
Introducing light energy into the charging/discharging process is an effective strategy to reduce the overpotential of Li−O 2 battery, which leads that the battery has higher energy conversion efficiency and better battery performance. However, the development has been hampered by the lack of suitable photocatalysts and cathode structure to accommodate the insoluble Li 2 O 2 . In order to overcome the aforementioned difficulties, a bifunctional photocatalyst α-Fe 2 O 3 /SnO 2 (FS) heterojunction was designed as the cathode to improve the charging/discharging overpotentials simultaneously. The photogenerated electrons and holes from FS participated in the oxygen reduction reaction (ORR) and oxygen revolution reaction (OER) under illumination, giving rise to an ultra-low charging/discharging overpotential of 0.01 V (energy efficiency up to 99.7%), which improved the electrochemical reaction kinetics of the Li−O 2 battery strikingly. In addition, the FS cathode exhibited excellent cycle stability under light (the battery energy efficiency can still maintain 80% after 252 cycles). The bifunctional catalyst designed in this paper has profoundly proved that the band engineering strategy can effectively utilize solar energy and provide important insights for understanding the mechanism of photo-assisted Li−O 2 battery.
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CHEMICAL ENGINEERING JOURNAL
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2023
·
IF 15.1
Shuzhen Yu,Yongchun Hou,Qijie Jin,Liangliang Zhu,Su Chen
As global warming and greenhouse gas emissions intensify, the scientific community is continuingly seeking effective solutions. One promising strategy known as artificial photosynthesis is proposed utilizing H 2 O as a reducing agent to transfer CO 2 into fuel. However, low O 2 production and conversion efficiency have hindered this approach in matching with natural photosynthesis. In this work, we propose a novel biomimetic photocatalyst design approach to improve the catalytic efficiency by slow photon mechanism. Our design is mainly inspired by two factors: 1) Chlorophyll, an abundant natural photosynthetic pigment, can efficiently and selectively reduce carbon dioxide and plays a key role in photosynthesis; 2) The iridoplast with a biological photonic crystal structure can significantly improve the efficiency of photosynthesis. Specifically, we couple photonic crystals and photocatalyst of sodium copper chlorophyllin (ChlCu), and binder of PVA through microfluidic blowing-spinning (MBS) to spray a composite photocatalytic film that can convert carbon dioxide and water into carbon monoxide and oxygen. By optimizing the content of ChlCu and the slow photon effect related to the bandgap position, the final CLPPs 300 -0.52% has two slow photon edges overlapping with the catalyst absorption spectrum, thus generating the maximum photon capture capability and achieving a high oxygen catalytic yield of up to 7.8 mmol g -1 h −1 . The spraying property of this material enable it to be coated on the external surfaces of other materials. This opens new possibilities of photocatalytic fabric preparation for CO 2 converting, providing new ideas of greenhouse gas capture and utilization to solve environmental problems.
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Materials Today Sustainability
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2023
·
IF 7.8
A. Shan,Y. Lu,L. Cheng,Z. Hou,D. Xili,Y. Li,J. Liu,H. Ma,J. Yang
Due to the high electronegativity , dissolved O 2 molecules can form strong chemisorption on oxygen-deficient nano-TiO 2 , which can alter the photocatalytic degradation process . Regarding this point, there is a lack of sufficient investigation so far, although there have been many reports on oxygen-deficient nano-TiO 2 . Here, we make the dissolved O 2 adsorbed on the oxygen-deficient nano-TiO 2 by simply stirring for a long time. The characterization and theoretical calculation results show that the chemisorption of O 2 significantly enhances the surface hydrogen bonding and results in a substantial increase in the co-adsorbed H 2 O molecules and –OH groups. The co-chemisorbed oxygen species promote the separation of electron-hole pairs, meanwhile accelerate the migration and accumulation of holes to the surface, which effectively enhances the direct oxidation of photogenerated holes. The findings of this work suggest that for long continuous reactions, the role of chemisorbed dissolved O 2 molecules on the photocatalytic degradation activity of oxygen-deficient nano-TiO 2 has to be considered.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2022
·
IF 24.319
Weijie Yang,Kailong Sun,Jun Wan,Yang-Ai Ma,Jiaqing Liu,Bicheng Zhu,Lin Liu,Feng Fu
The insufficient generation of oxidative active species severely limits the activity of photocatalytic aerobic oxidation for organic pollutants degradation in wastewater. Herein, transition metal phosphides (TMPs) cocatalysts, including Ni 2 P, Co 2 P, and NiCoP, were loaded on Bi 4 O 5 Br 2 nanosheets by a simple liquid assembly method. Among which, 15% NiCoP/Bi 4 O 5 Br 2 heterojunction exhibits the optimal photocatalytic activity for degrading phenolic pollutants owing to the high concentration of h + and •O 2 − active species, and it displays excellent tolerance for the inorganic ions, pH value, water matrix, and outdoor sunlight. The S-scheme charge transfer mechanism was revealed for NiCoP/Bi 4 O 5 Br 2 heterojunction, which significantly improves the separation efficiency of photogenerated charge carriers and facilitates the accumulation of active h + . Furthermore, NiCoP with high reduction potential and outstanding O 2 activation ability is served as the active site for producing •O 2 − . This work can inspire the further design of bifunctional photocatalysts for efficient photocatalytic aerobic oxidation applications.
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Advanced Energy Materials
·
2022
·Vol. 12
·期 12
·2102764
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IF 29.698
Zongqiang Sun,Xiaodong Lin,Wenjie Dou,Yanyan Tan,Ajuan Hu,Qing Hou,Ruming Yuan,Mingsen Zheng,Quanfeng Dong
The large charge overpotential and poor cycling stability triggered by sluggish Li 2 O 2 oxidation kinetics and severe superoxide-related side reactions greatly restrict the development and application of lithium–oxygen batteries. Finding out high-efficiency catalysts that can effectively facilitate a highly reversible formation/decomposition of lithium peroxide is still a crucial challenge in the field of Li–O 2 batteries. Herein, a soluble catalyst of 2,2'-Azino-bis(3-ethylbenzothiazoline-6-sulfonic acid) diammonium salt (ABTS) that can promote highly reversible formation and decomposition of Li 2 O 2 during discharge and charge processes is reported for the first time. During discharge, it can capture and couple two LiO 2 intermediates via its sulfonate and ammonium ions, and induce the intramolecular disproportionation reaction to produce Li 2 O 2 through ionic microenvironment, which not only prompts the solution-phase growth of Li 2 O 2 , but also restricts the reactivity of LiO 2 intermediate, thus significantly alleviating the electrode surface passivation issue and suppressing the superoxide-related side reactions. During charge, it can quickly transport electrons between the electrode and Li 2 O 2 by serving as a new kind of redox mediator (RM), thus greatly facilitating the Li 2 O 2 oxidation kinetics. As a result, the Li–O 2 batteries that incorporate ABTS exhibit outstanding electrochemical performance, low charge overpotential, high discharge capacity, and high cycling stability.
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JOURNAL OF ELECTROANALYTICAL CHEMISTRY
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2022
·
IF 4.598
Deyu Mao,Shenglong Yi,Zirui He,Qiancheng Zhu
Lithium-oxygen (Li-O 2 ) batteries with high theoretical energy density are well developed over the past decade, as the cycle performance and round-trip efficiency had enhanced prominently. However, there are still several obstacles that need to be tackled before commercial application. Among them, proper cathode structure design with low cost stands as a core problem. A Typical type of gas diffusion layer cathode are usually carbon paper, which is valuableness, meanwhile, cannot fit the application of flexible devices. In this work, non-woven fabrics were applied as basis materials to synthesis Fe 3 C/N-doped carbon tubes gas diffusion layer by a simple carbonization method. The resulting carbon cloth can be used directly as binder-free and current collector-free cathode for Li-O 2 batteries. More than 130 stable cycles were achieved. The composite synthesized in this paper has the possibility for future application in flexible lithium-oxygen batteries and provide a new strategy for the recovery of non-woven fabrics.
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ACS Applied Energy Materials
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2022
·
IF 6.959
Sisi Wu,Jing Yang,Ning Qin,Yingzhi Li,Haiou Wang,Yong-Wei Zhang,Qing Wang,Zhouguang Lu
LiO2 is a critical intermediate of oxygen reduction reaction in nonaqueous Li–O2 batteries that largely determines the discharge capacity and cycling stability. Currently, functional redox mediators that can promote the solution reaction route by enhancing the solvation of LiO2 have attracted tremendous interest to increase the attainable capacity. Conversely, redox mediators that quench LiO2 and facilitate the surface reaction route receive little attention. Here, we provide an in-depth exploration of the catalytic pathway and effect of a superoxide quencher that modulates the surface growth of Li2O2. Surprisingly, the predomination of the surface reaction route by ethyl viologen helps deliver a capacity as much as that promoted by the solution reaction route. The findings of this work provide a new direction of screening and evaluating functioning redox mediators for Li–O2 batteries.
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高影响因子
NEW JOURNAL OF CHEMISTRY
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2022
·Vol. 46
·期 30
·14510-14516
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IF 3.925
Yunxian Zhang,Yongyu Pang,Dong Xia,Guoliang Chai
As a successful alternative to the complex and dangerous anthraquinone process, a simple and safe method for the efficient preparation of hydrogen peroxide is to use the electrochemical two-electron oxygen reduction reaction (2e− ORR) process. Herein, we report a facile approach to achieving metal-free nitrogen-doped carbon material electrocatalysts (N-CMCs) using cheap and easily available raw materials, which also have an excellent electrochemical 2e− ORR catalytic performance and selectivity for hydrogen peroxide (H2O2). The as-fabricated nitrogen-doped carbon material electrocatalysts (named as N-CMC-1 : 5) deliver the high H2O2 selectivity of over 80% in a wide potential range from 0.30 to 0.70 V vs. RHE, where the highest H2O2 selectivity can reach 81.4% at 0.42 V vs. RHE. X-ray photoelectron spectroscopy and electrochemical analyses reveal that the content of pyrrolic-N in the catalysts has a positive effect on the 2e− ORR activity. When the catalyst contains more pyrrolic-N, the catalyst demonstrates a better 2e− ORR performance and H2O2 selectivity in alkaline medium, as well as the long-term stability of the catalyst.
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Nanomaterials
·
2022
·Vol. 12
·期 11
·1931
·
IF 5.719
Shaohong Zang,Xiaorong Cai,Mengshan Chen,Dehong Teng,Fei Jing,Zhe Leng,Yingtang Zhou,Feng Lin
Photocatalytic water splitting is one of the promising approaches to solving environmental problems and energy crises. However, the sluggish 4e−transfer kinetics in water oxidation half-reaction restricts the 2e−reduction efficiency in photocatalytic water splitting. Herein, cobalt vanadate-decorated polymeric carbon nitride (named CoVO/PCN) was constructed to mediate the carrier kinetic process in a photocatalytic water oxidation reaction (WOR). The photocatalysts were well-characterized by various physicochemical techniques such as XRD, FT-IR, TEM, and XPS. Under UV and visible light irradiation, the O2evolution rate of optimized 3wt% CoVO/PCN reached 467 and 200 μmol h−1g−1, which were about 6.5 and 5.9 times higher than that of PCN, respectively. Electrochemical tests and PL results reveal that the recombination of photogenerated carriers on PCN is effectively suppressed and the kinetics of WOR is significantly enhanced after CoVO introduction. This work highlights key features of the tuning carrier kinetics of PCN using charge-conducting materials, which should be the basis for the further development of photocatalytic O2reactions.Keywords:photocatalysis;water oxidation;cobalt vanadates;polymeric carbon nitride
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PubMed
高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
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2022
·Vol. 169
·期 6
·060507
·
IF 4.386
Zining Man,Hao Tian,Xingbao Zhu,Yu Wang,Yuanguo Wu,Xiangyu Wen,Zhe Lü
The solid-state batteries have received widespread attention due to their excellent stability and safety, however, the low ionic conductivity and weak interface contact always restricted its performance. In this work, we propose an in situ thermally cross-linked and solidified polymer electrolyte with polyethylene glycol diacrylate (PEGDA) as scaffold in which succinonitrile (SN) and lithium bis-trifluoromethanesulfonimide (LiTFSI) were further introduced to improve the ionic conductivity. Herein, the composite gel was served as not only solid-solid interface material but also solid-state electrolyte. Different with conventional polymer gels, the solvent evaporation could not happen for this composite material during the solidification process, and therefore resulting in good interface contact without inside bubbles. We further present the investigation on transport principle of Li+ in the solid-state electrolyte and the effect of molecular chain on ionic conductivity. The conductivity of the solid-state electrolyte can reach 1.76 × 10−4 S cm−1 at room temperature without any assistance of liquid electrolytes, which is attributed to the short molecular chain of PEGDA. Electrochemical window of the solid-state electrolyte can reach 5.2 V after cross-linking treatment. And the lithium-oxygen battery using this solid-state electrolyte can stably cycle for more than 1100 cycles with a current density of 200 mA g−1 and a limit capacity of 200 mAh g−1 at room temperature.
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