scholarly journals Boosting the activity of Prussian-blue analogue as efficient electrocatalyst for water and urea oxidation

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Yongqiang Feng ◽  
Xiao Wang ◽  
Peipei Dong ◽  
Jie Li ◽  
Li Feng ◽  
...  
Keyword(s):  
Prussian Blue ◽  
Current Density ◽  
Cost Effective ◽  
Catalytic Performance ◽  
Dual Function ◽  
Prussian Blue Analogue ◽  
Energy And Environment ◽  
Energy Conversion And Storage ◽  
Electrolysis Potential ◽  
A Current

Abstract The design and fabrication of intricate hollow architectures as cost-effective and dual-function electrocatalyst for water and urea electrolysis is of vital importance to the energy and environment issues. Herein, a facile solvothermal strategy for construction of Prussian-blue analogue (PBA) hollow cages with an open framework was developed. The as-obtained CoFe and NiFe hollow cages (CFHC and NFHC) can be directly utilized as electrocatalysts towards oxygen evolution reaction (OER) and urea oxidation reaction (UOR) with superior catalytic performance (lower electrolysis potential, faster reaction kinetics and long-term durability) compared to their parent solid precursors (CFC and NFC) and even the commercial noble metal-based catalyst. Impressively, to drive a current density of 10 mA cm−2 in alkaline solution, the CFHC catalyst required an overpotential of merely 330 mV, 21.99% lower than that of the solid CFC precursor (423 mV) at the same condition. Meanwhile, the NFHC catalyst could deliver a current density as high as 100 mA cm−2 for the urea oxidation electrolysis at a potential of only 1.40 V, 24.32% lower than that of the solid NFC precursor (1.85 V). This work provides a new platform to construct intricate hollow structures as promising nano-materials for the application in energy conversion and storage.

scholarly journals Nanostructured Fe-Ni Sulfide: A Multifunctional Material for Energy Generation and Storage

Catalysts ◽  
2019 ◽  
Vol 9 (7) ◽  
pp. 597 ◽  
Author(s):  
Chen Zhao ◽  
Chunyang Zhang ◽  
Sanket Bhoyate ◽  
Pawan K. Kahol ◽  
Nikolaos Kostoglou ◽  
...  
Keyword(s):  
Current Density ◽  
Nickel Foam ◽  
Energy Generation ◽  
Catalytic Performance ◽  
Cell Potential ◽  
Energy Applications ◽  
Energy Needs ◽  
Energy Conversion And Storage ◽  
And Storage ◽  
A Current

Multifunctional materials for energy conversion and storage could act as a key solution for growing energy needs. In this study, we synthesized nanoflower-shaped iron-nickel sulfide (FeNiS) over a nickel foam (NF) substrate using a facile hydrothermal method. The FeNiS electrode showed a high catalytic performance with a low overpotential value of 246 mV for the oxygen evolution reaction (OER) to achieve a current density of 10 mA/cm2, while it required 208 mV at 10 mA/cm2 for the hydrogen evolution reaction (HER). The synthesized electrode exhibited a durable performance of up to 2000 cycles in stability and bending tests. The electrolyzer showed a lower cell potential requirement for a FeNiS-Pt/C system (1.54 V) compared to a standard benchmark IrO2-Pt/C system (1.56 V) to achieve a current density of 10 mA/cm2. Furthermore, the FeNiS electrode demonstrated promising charge storage capabilities with a high areal capacitance of 13.2 F/cm2. Our results suggest that FeNiS could be used for multifunctional energy applications such as energy generation (OER and HER) and storage (supercapacitor).

CuFe–P from a Prussian blue analogue as an electrocatalyst for efficient full water splitting

2020 ◽  
Vol 4 (8) ◽  
pp. 3985-3991 ◽  
Author(s):  
Xianjun Xing ◽  
Yuqiang Song ◽  
Wen Jiang ◽  
Xianwen Zhang
Keyword(s):  
Prussian Blue ◽  
Water Splitting ◽  
Current Density ◽  
Low Voltage ◽  
Prussian Blue Analogue ◽  
A Current

An alkaline electrolyzer assembled with the CuFe–P/NF electrode can achieve a current density of 10 mA cm−2 at an extremely low voltage of 1.577 V.

scholarly journals Rechargeable Aqueous Zinc-Ion Batteries in MgSO4/ZnSO4 Hybrid Electrolytes

2020 ◽  
Vol 12 (1) ◽  
Author(s):  
Yingmeng Zhang ◽  
Henan Li ◽  
Shaozhuan Huang ◽  
Shuang Fan ◽  
Lingna Sun ◽  
...  
Keyword(s):  
Current Density ◽  
Specific Capacity ◽  
Cost Effective ◽  
Reversible Capacity ◽  
Zinc Ion ◽  
Rate Performance ◽  
Capacity Fading ◽  
Battery System ◽  
High Specific Capacity ◽  
A Current

AbstractMgSO4 is chosen as an additive to address the capacity fading issue in the rechargeable zinc-ion battery system of MgxV2O5·nH2O//ZnSO4//zinc. Electrolytes with different concentration ratios of ZnSO4 and MgSO4 are investigated. The batteries measured in the 1 M ZnSO4−1 M MgSO4 electrolyte outplay other competitors, which deliver a high specific capacity of 374 mAh g−1 at a current density of 100 mA g−1 and exhibit a competitive rate performance with the reversible capacity of 175 mAh g−1 at 5 A g−1. This study provides a promising route to improve the performance of vanadium-based cathodes for aqueous zinc-ion batteries with electrolyte optimization in cost-effective electrolytes.

Construction of a hierarchical NiFe layered double hydroxide with a 3D mesoporous structure as an advanced electrocatalyst for water oxidation

2018 ◽  
Vol 5 (8) ◽  
pp. 1795-1799 ◽  
Author(s):  
Jiahao Yu ◽  
Fulin Yang ◽  
Gongzhen Cheng ◽  
Wei Luo
Keyword(s):  
Hydrothermal Method ◽  
Layered Double Hydroxide ◽  
Current Density ◽  
Oxygen Evolution Reaction ◽  
Water Oxidation ◽  
Cost Effective ◽  
Mesoporous Structure ◽  
One Step ◽  
Double Hydroxide ◽  
A Current

A facile and cost-effective one-step hydrothermal method is used to synthesize NiFe LDH microclusters with a 3D hierarchically mesoporous architecture. This superior electrocatalyst can achieve a current density of 10 mA cm−2 with an ultralow overpotential of 211 mV toward the oxygen evolution reaction.

Novel Prussian-blue-analogue microcuboid assemblies and their derived catalytic performance for effective reduction of 4-nitrophenol

2018 ◽  
Vol 42 (24) ◽  
pp. 20212-20218 ◽  
Author(s):  
Yongqiang Feng ◽  
Masoud Sakaki ◽  
Jae-hyun Kim ◽  
Jianfeng Huang ◽  
Koji Kajiyoshi
Keyword(s):  
Prussian Blue ◽  
Catalytic Performance ◽  
Prussian Blue Analogue ◽  
Effective Reduction ◽  
First Time ◽  
Excellent Catalytic Performance

Novel Co–Fe PBA microcuboids (MCBs) were solvothermally synthesized in the presence of PVP for the first time, and the cuboid-derived catalyst, CoFe/NC-MCBs, showed excellent catalytic performance for the reduction of 4-nitrophenol.

scholarly journals Spiderweb-Like Fe-Co Prussian Blue Analogue Nanofibers as Efficient Catalyst for Bisphenol-A Degradation by Activating Peroxymonosulfate

Nanomaterials ◽  
2019 ◽  
Vol 9 (3) ◽  
pp. 402 ◽  
Author(s):  
Hongyu Wang ◽  
Chaohai Wang ◽  
Junwen Qi ◽  
Yubo Yan ◽  
Ming Zhang ◽  
...  
Keyword(s):  
Bisphenol A ◽  
Prussian Blue ◽  
Degradation Mechanism ◽  
Packed Column ◽  
Catalytic Performance ◽  
Efficient Catalyst ◽  
Paramagnetic Resonance ◽  
Prussian Blue Analogue ◽  
Practical Applications ◽  
Initial Ph

Prussian blue and its analogues (PBA) based nanomaterials have been widely applied to removing pollutants in the recent years. However, easy aggregation and poor recycling largely limit their practical applications. In this work, spiderweb-like Fe-Co Prussian blue analogue/polyacrylonitrile (FCPBA/PAN) nanofibers were prepared by electrospinning and applied to degrading bisphenol-A (BPA) by activating peroxymonosulfate (PMS). Detailed characterization demonstrated that a high loading of FCPBA (86% of FCPBA in FCPBA/PAN) was successfully fixed on the PAN nanofibers. 67% of BPA was removed within 240 min when 500 mg·L−1 PMS and 233 mg·L−1 FCPBA/PAN were introduced in 20 mg·L−1 BPA solution at initial pH of 2.8. Electron paramagnetic resonance (EPR) and radical inhibition experiments were performed to identify the possible degradation mechanism. For comparison, a low loading of FCPBA nanofibers (0.6FCPBA/PAN nanofibers, 43% of FCPBA in FCPBA/PAN) were also prepared and tested the catalytic performance. The results showed that the activity of FCPBA/PAN was much higher than 0.6FCPBA/PAN. Furthermore, a FCPBA/PAN packed column was made as a reactor to demonstrate the reusability and stability of FCPBA/PAN nanofibers, which also exhibited the bright future for the industrial application. This work makes it possible to fabricate efficient PBA nanocatalysts with excellent recyclability and promotes the application of PBA in industrial areas.

Phosphorization of a Prussian blue analogue-derived Co–N–C catalyst for synchronously boosting the oxygen reduction and evolution reactions

2020 ◽  
Vol 4 (5) ◽  
pp. 2411-2421 ◽  
Author(s):  
Xiangyang Zhou ◽  
Lei Xu ◽  
Yuning Gao ◽  
Liang Li ◽  
Jingjing Tang ◽  
...  
Keyword(s):  
Prussian Blue ◽  
Oxygen Reduction ◽  
Oxygen Evolution ◽  
Catalytic Performance ◽  
Prussian Blue Analogue ◽  
Dual Functional

We successfully developed a PBA-driven method to obtain dual-functional catalysts for oxygen evolution and oxygen reduction and simultaneously enhance their catalytic performance through simple phosphating.

Facet Topography and Dislocation Structure as a Possible Source for Electrical Heterogeneity in [001] TILT Bicrystals of YBa2Cu3O7-δ

1996 ◽  
Vol 54 ◽  
pp. 338-339
Author(s):  
I-Fei Tsu ◽  
D.L. Kaiser ◽  
S.E. Babcock
Keyword(s):  
Grain Boundary ◽  
Critical Current Density ◽  
Critical Current ◽  
Current Density ◽  
Electromagnetic Properties ◽  
Length Scale ◽  
Density Values ◽  
Current Densities ◽  
Applied Fields ◽  
A Current

A current theme in the study of the critical current density behavior of YBa2Cu3O7-δ (YBCO) grain boundaries is that their electromagnetic properties are heterogeneous on various length scales ranging from 10s of microns to ˜ 1 Å. Recently, combined electromagnetic and TEM studies on four flux-grown bicrystals have demonstrated a direct correlation between the length scale of the boundaries’ saw-tooth facet configurations and the apparent length scale of the electrical heterogeneity. In that work, enhanced critical current densities are observed at applied fields where the facet period is commensurate with the spacing of the Abrikosov flux vortices which must be pinned if higher critical current density values are recorded. To understand the microstructural origin of the flux pinning, the grain boundary topography and grain boundary dislocation (GBD) network structure of [001] tilt YBCO bicrystals were studied by TEM and HRTEM.

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