scholarly journals d-Orbital steered active sites through ligand editing on heterometal imidazole frameworks for rechargeable zinc-air battery

2020 ◽  
Vol 11 (1) ◽  
Author(s):  
Yi Jiang ◽  
Ya-Ping Deng ◽  
Ruilin Liang ◽  
Jing Fu ◽  
Rui Gao ◽  
...  
Keyword(s):  
Active Sites ◽  
Charge Voltage ◽  
Desorption Process ◽  
Hierarchical Pores ◽  
Orbital Electron ◽  
Metal Organic ◽  
Air Battery ◽  
Successful Employment ◽  
Adsorption Desorption ◽  
Zinc Air Batteries

AbstractThe implementation of pristine metal-organic frameworks as air electrode may spark fresh vitality to rechargeable zinc-air batteries, but successful employment is rare due to the challenges in regulating their electronic states and structural porosity. Here we conquer these issues by incorporating ligand vacancies and hierarchical pores into cobalt-zinc heterometal imidazole frameworks. Systematic characterization and theoretical modeling disclose that the ligand editing eases surmountable energy barrier for *OH deprotonation by its efficacy to steer metal d-orbital electron occupancy. As a stride forward, the selected cobalt-zinc heterometallic alliance lifts the energy level of unsaturated d-orbitals and optimizes their adsorption/desorption process with oxygenated intermediates. With these merits, cobalt-zinc heterometal imidazole frameworks, as a conceptually unique electrode, empowers zinc-air battery with a discharge-charge voltage gap of 0.8 V and a cyclability of 1250 h at 15 mA cm–2, outperforming the noble-metal benchmarks.

scholarly journals Utilizing solar energy to improve the oxygen evolution reaction kinetics in zinc–air battery

2019 ◽  
Vol 10 (1) ◽  
Author(s):  
Xiaorui Liu ◽  
Yifei Yuan ◽  
Jie Liu ◽  
Bin Liu ◽  
Xu Chen ◽  
...  
Keyword(s):  
Solar Energy ◽  
Low Cost ◽  
Cell Voltage ◽  
Key Factors ◽  
Charge Voltage ◽  
Promotion Strategy ◽  
Charge Potential ◽  
Air Battery ◽  
Low Charge ◽  
Zinc Air Batteries

Abstract Directly harvesting solar energy for battery charging represents an ultimate solution toward low-cost, green, efficient and sustainable electrochemical energy storage. Here, we design a sunlight promotion strategy into rechargeable zinc–air battery with significantly reduced charging potential below the theoretical cell voltage of zinc–air batteries. The sunlight-promoted zinc–air battery using BiVO4 or α-Fe2O3 air photoelectrode achieves a record-low charge potential of ~1.20 and ~1.43 V, respectively, under illumination, which is lowered by ~0.5–0.8 V compared to the typical charge voltage of ~2 V in conventional zinc–air battery. The band structure and photoelectrochemical stability of photoelectrodes are found to be key factors determining the charging performance of sunlight-promoted zinc–air batteries. The introduction of photoelectrode as an air electrode opens a facile way for developing integrated single-unit zinc–air batteries that can efficiently use solar energy to overcome the high charging overpotential of conventional zinc–air batteries.

scholarly journals Recent Advances on MOF Derivatives for Non-Noble Metal Oxygen Electrocatalysts in Zinc-Air Batteries

2021 ◽  
Vol 13 (1) ◽  
Author(s):  
Yuting Zhu ◽  
Kaihang Yue ◽  
Chenfeng Xia ◽  
Shahid Zaman ◽  
Huan Yang ◽  
...  
Keyword(s):  
Noble Metal ◽  
Active Sites ◽  
Metal Cluster ◽  
High Specific Surface Area ◽  
Single Atom ◽  
Carbon Composites ◽  
Design Strategies ◽  
Comprehensive Overview ◽  
Metal Organic ◽  
Zinc Air Batteries

AbstractOxygen electrocatalysts are of great importance for the air electrode in zinc-air batteries (ZABs). Owing to the high specific surface area, controllable pore size and unsaturated metal active sites, metal–organic frameworks (MOFs) derivatives have been widely studied as oxygen electrocatalysts in ZABs. To date, many strategies have been developed to generate efficient oxygen electrocatalysts from MOFs for improving the performance of ZABs. In this review, the latest progress of the MOF-derived non-noble metal–oxygen electrocatalysts in ZABs is reviewed. The performance of these MOF-derived catalysts toward oxygen reduction, and oxygen evolution reactions is discussed based on the categories of metal-free carbon materials, single-atom catalysts, metal cluster/carbon composites and metal compound/carbon composites. Moreover, we provide a comprehensive overview on the design strategies of various MOF-derived non-noble metal–oxygen electrocatalysts and their structure-performance relationship. Finally, the challenges and perspectives are provided for further advancing the MOF-derived oxygen electrocatalysts in ZABs.

Cuprum Metal-Organic-Framework and Polyacrylonitrile-Derived Cu-N-C Electrocatalyst for Application in Zinc-Air Batteries

NANO ◽  
2020 ◽  
Vol 15 (01) ◽  
pp. 2050012
Author(s):  
Wenming Zhang ◽  
Jintao Chen ◽  
Xiaorui Li ◽  
Jiaqing Zhang ◽  
Yanan Li ◽  
...  
Keyword(s):  
Electrochemical Performance ◽  
Active Sites ◽  
Metal Organic Framework ◽  
High Specific Surface Area ◽  
Promising Alternative ◽  
Precious Metal Catalysts ◽  
Excellent Electrochemical Performance ◽  
Growth Method ◽  
Metal Organic ◽  
Zinc Air Batteries

Cu-N-C electrocatalyst was successfully prepared with Cu-BTC and polyacrylonitrile as templates by electrospinning and in-situ growth method. The effect of various [Formula: see text]-doped content on the electrochemical performance of the catalyst were investigated and the Cu-N-C-0.25 exhibited the best OER/ORR catalytic activities. When it was applied to the cathode of the zinc-air batteries, the power density of Cu-N-C-0.25 was 209.1[Formula: see text]mW[Formula: see text]cm[Formula: see text], which exceeded that of the commercial Pt/C[Formula: see text]IrO2 hybrid catalyst (157[Formula: see text]mW[Formula: see text]cm[Formula: see text]). The excellent electrochemical performance may be attributed to large number of active sites and high specific surface area on Cu-N-C electrocatalyst. It will be a promising alternative to precious metal catalysts containing Pt, Ir or Ru and their oxides.

scholarly journals Remedy for Collapse of ZIF Derived Carbon: Micro-Pore Filled Synthesis to Improve ORR Catalytic Property

2022 ◽  
Author(s):  
Xingxing Wu ◽  
Songwei Zhang ◽  
Jiaojiao Gao ◽  
Xiaopeng Liu ◽  
Qunhui Yuan ◽  
...  
Keyword(s):  
Active Sites ◽  
Metal Organic Framework ◽  
Reduction Reaction ◽  
High Nitrogen Content ◽  
High Nitrogen ◽  
Pore Filling ◽  
Zeolitic Imidazolate Framework ◽  
Half Wave ◽  
Metal Organic ◽  
Air Battery

Abstract Zeolitic imidazolate framework (ZIF) derived carbons deliver outstanding performance as oxygen reduction reaction (ORR) catalysts. However, their electrocatalytic activities are limited due to unavoidable collapse of ZIFs upon pyrolysis, which results in degradation of porosity, sintering of metals and loss of active sites. In this work, a micro-pore filling strategy was employed to strength the architecture of ZIF by using size matched cyanamide molecules as fillers. The cyanamide with high nitrogen content shows a triple effect in stabilizing the carbonaceous skeleton, preserving of metal containing active sites and improving the conductivity of matrix. Therefore, the as-prepared Fe, Co co-doped ZIF derived carbon (FeCo@NC-N) delivers a significantly improved electrochemical activity for ORR than its unfilled counterpart, with half-wave potential upshifted by 30 mV (0.84 V vs. RHE). Besides, a promoted power density of home-assembled zinc-air battery is obtained when FeCo@NC-N is applied as cathode catalyst. This work demonstrates a reliable approach to mitigate framework collapse of metal organic framework (MOF), thus may open a new way for fabrication of MOF based catalysts with increased loading of pores and active sites.

scholarly journals Breaking the Upper Bound of Siloxane Uptake: Metal-Organic Frameworks as an Adsorbent Platform

2021 ◽  
Author(s):  
Ezgi Gulcay ◽  
Paul Iacomi ◽  
Youngsang Ko ◽  
Jong-San Chang ◽  
Guillaume Rioland ◽  
...  
Keyword(s):  
Energy Source ◽  
Renewable Energy Source ◽  
Metal Organic Frameworks ◽  
Efficient Removal ◽  
Desorption Process ◽  
Optimal Packing ◽  
Computational Screening ◽  
Metal Organic ◽  
Selection For ◽  
Adsorption Desorption

Biogas, regarded as a promising renewable energy source, still needs to be upgraded. This calls for the removal of the most prominent contaminants, among others the octamethylcyclotetrasiloxane (D4) molecule. Herein, high throughput computational screening in tandem with synthesis and adsorption testing revealed the hydrophobic Zr-MOF PCN-777 as an optimal D4 adsorbent with record gravimetric (1.8 g/g) and volumetric (0.49 g/cm3) uptakes, alongside with a reversible and fast adsorption/desorption process, good cyclability and easy regeneration. This MOF was demonstrated to encompass an ideal combination of mesoporous cages and chemical functionality to enable an optimal packing of the siloxane molecules and their efficient removal while maintaining the process highly reversible thanks to moderately high host/guest interactions. This work highlights the efficacy of an integrated workflow for accelerating adsorbent selection for a desired application, spanning the entire pipeline from method validation to computational screening, synthesis and adsorption testing towards the identification of the optimal adsorbents.<br>

scholarly journals Breaking the Upper Bound of Siloxane Uptake: Metal-Organic Frameworks as an Adsorbent Platform

2021 ◽  
Author(s):  
Ezgi Gulcay ◽  
Paul Iacomi ◽  
Youngsang Ko ◽  
Jong-San Chang ◽  
Guillaume Rioland ◽  
...  
Keyword(s):  
Energy Source ◽  
Renewable Energy Source ◽  
Metal Organic Frameworks ◽  
Efficient Removal ◽  
Desorption Process ◽  
Optimal Packing ◽  
Computational Screening ◽  
Metal Organic ◽  
Selection For ◽  
Adsorption Desorption

Biogas, regarded as a promising renewable energy source, still needs to be upgraded. This calls for the removal of the most prominent contaminants, among others the octamethylcyclotetrasiloxane (D4) molecule. Herein, high throughput computational screening in tandem with synthesis and adsorption testing revealed the hydrophobic Zr-MOF PCN-777 as an optimal D4 adsorbent with record gravimetric (1.8 g/g) and volumetric (0.49 g/cm3) uptakes, alongside with a reversible and fast adsorption/desorption process, good cyclability and easy regeneration. This MOF was demonstrated to encompass an ideal combination of mesoporous cages and chemical functionality to enable an optimal packing of the siloxane molecules and their efficient removal while maintaining the process highly reversible thanks to moderately high host/guest interactions. This work highlights the efficacy of an integrated workflow for accelerating adsorbent selection for a desired application, spanning the entire pipeline from method validation to computational screening, synthesis and adsorption testing towards the identification of the optimal adsorbents.<br>

Metal-organic-framework derived hollow manganese nickel selenide spheres confined with nanosheets on nickel foam for hybrid supercapacitors

2021 ◽  
Author(s):  
Bahareh ameri ◽  
Akbar Mohammadi Zardkhoshoui ◽  
Saied Saeed Hosseiny Davarani
Keyword(s):  
Active Sites ◽  
Nickel Foam ◽  
Metal Organic Framework ◽  
High Surface ◽  
Metal Organic Frameworks ◽  
High Surface Area ◽  
Supercapacitive Performance ◽  
Hybrid Supercapacitors ◽  
Porous Networks ◽  
Metal Organic

Metal-organic frameworks (MOFs) derived nanoarchitectures have special features, such as high surface area (SA), abundant active sites, exclusive porous networks, and remarkable supercapacitive performance when compared to traditional nanoarchitectures. Herein,...

Sign in / Sign up

Export Citation Format

Share Document