Active site-engineered bifunctional electrocatalysts of ternary spinel oxides, M0.1Ni0.9Co2O4 (M: Mn, Fe, Cu, Zn) for the air electrode of rechargeable zinc–air batteries

2017 ◽  
Vol 5 (39) ◽  
pp. 21016-21026 ◽  
Author(s):  
Yi-Ting Lu ◽  
Yu-Ju Chien ◽  
Ching-Fang Liu ◽  
Ting-Hsuan You ◽  
Chi-Chang Hu
Keyword(s):  
Active Site ◽  
Active Sites ◽  
Air Electrode ◽  
Bifunctional Electrocatalysts ◽  
Spinel Oxides ◽  
Zinc Air Batteries

The active sites of M0.1Ni0.9Co2O4 for the OER and ORR are successfully engineered for its application in rechargeable Zn–air batteries.

Co nanoparticles combined with nitrogen-doped graphitic carbon anchored on carbon fibers as a self-standing air electrode for flexible zinc–air batteries

2020 ◽  
Vol 8 (15) ◽  
pp. 7184-7191 ◽  
Author(s):  
Yangshen Chen ◽  
Wenhui Zhang ◽  
Zeyu Zhu ◽  
Lulu Zhang ◽  
Jiayi Yang ◽  
...  
Keyword(s):  
Carbon Fibers ◽  
Active Sites ◽  
Graphitic Carbon ◽  
Air Electrode ◽  
Nitrogen Doped ◽  
Co Nanoparticles ◽  
Zinc Air Batteries

The flexible Co@NPCFs composites can provide rich active sites for electrocatalysis and are able to capture oxygen and desorb the OH− during the discharging and charging processes of ZABs.

Continuous fabrication of a MnS/Co nanofibrous air electrode for wide integration of rechargeable zinc–air batteries

Nanoscale ◽  
2017 ◽  
Vol 9 (41) ◽  
pp. 15865-15872 ◽  
Author(s):  
Yang Wang ◽  
Jing Fu ◽  
Yining Zhang ◽  
Matthew Li ◽  
Fathy Mohamed Hassan ◽  
...  
Keyword(s):  
Oxygen Reduction ◽  
High Performance ◽  
Air Electrode ◽  
Highly Efficient ◽  
Bifunctional Electrocatalysts ◽  
Continuous Fabrication ◽  
Zinc Air Batteries

Exploring highly efficient bifunctional electrocatalysts toward the oxygen reduction and evolution reactions is essential for the realization of high-performance rechargeable zinc–air batteries.

scholarly journals A Porous Nano-Micro-Composite as a High-Performance Bi-Functional Air Electrode with Remarkable Stability for Rechargeable Zinc–Air Batteries

2020 ◽  
Vol 12 (1) ◽  
Author(s):  
Yasir Arafat ◽  
Muhammad Rizwan Azhar ◽  
Yijun Zhong ◽  
Xiaomin Xu ◽  
Moses O. Tadé ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Active Sites ◽  
High Performance ◽  
Metal Organic Framework ◽  
Extended Period ◽  
Perovskite Oxide ◽  
High Catalytic Activity ◽  
Air Electrode ◽  
Nitrogen Doped Carbon ◽  
Zinc Air Batteries

AbstractThe development of bi-functional electrocatalyst with high catalytic activity and stable performance for both oxygen evolution/reduction reactions (OER/ORR) in aqueous alkaline solution is key to realize practical application of zinc–air batteries (ZABs). In this study, we reported a new porous nano-micro-composite as a bi-functional electrocatalyst for ZABs, devised by the in situ growth of metal–organic framework (MOF) nanocrystals onto the micrometer-sized Ba0.5Sr0.5Co0.8Fe0.2O3 (BSCF) perovskite oxide. Upon carbonization, MOF was converted to porous nitrogen-doped carbon nanocages and ultrafine cobalt oxides and CoN4 nanoparticles dispersing inside the carbon nanocages, which further anchored on the surface of BSCF oxide. We homogeneously dispersed BSCF perovskite particles in the surfactant; subsequently, ZIF-67 nanocrystals were grown onto the BSCF particles. In this way, leaching of metallic or organic species in MOFs and the aggregation of BSCF were effectively suppressed, thus maximizing the number of active sites for improving OER. The BSCF in turn acted as catalyst to promote the graphitization of carbon during pyrolysis, as well as to optimize the transition metal-to-carbon ratio, thus enhancing the ORR catalytic activity. A ZAB fabricated from such air electrode showed outstanding performance with a potential gap of only 0.83 V at 5 mA cm−2 for OER/ORR. Notably, no obvious performance degradation was observed for the continuous charge–discharge operation for 1800 cycles over an extended period of 300 h.

Synergetic electronic modulation and nanostructure engineering of heterostructured RuO2/Co3O4 as advanced bifunctional electrocatalyst for Zinc-air batteries

2021 ◽  
Author(s):  
Xiaojie Zhuang ◽  
Yitong Zhou ◽  
Zhongqing Jiang ◽  
Xianzhi Yao ◽  
Xin-Yao Yu
Keyword(s):  
High Performance ◽  
Air Electrode ◽  
Bifunctional Electrocatalyst ◽  
Electrode Reactions ◽  
Bifunctional Electrocatalysts ◽  
Zinc Air Batteries

Exploring high-performance bifunctional electrocatalysts for air electrode reactions is significant for Zn-air batteries (ZABs). Herein, synergistic electronic modulation and nanostructure engineering are realized by a facile template-engaged synthesis of hierarchical...

Catalytic Resonance Theory: Parallel Reaction Pathway Control

2019 ◽  
Author(s):  
M. Alexander Ardagh ◽  
Manish Shetty ◽  
Anatoliy Kuznetsov ◽  
Qi Zhang ◽  
Phillip Christopher ◽  
...  
Keyword(s):  
Chemical Reactions ◽  
Active Site ◽  
Active Sites ◽  
Reaction Pathway ◽  
Control Strategies ◽  
Oscillation Amplitude ◽  
Catalytic Performance ◽  
Parallel Reaction ◽  
Resonance Theory ◽  
Static Conditions

Catalytic enhancement of chemical reactions via heterogeneous materials occurs through stabilization of transition states at designed active sites, but dramatically greater rate acceleration on that same active site is achieved when the surface intermediates oscillate in binding energy. The applied oscillation amplitude and frequency can accelerate reactions orders of magnitude above the catalytic rates of static systems, provided the active site dynamics are tuned to the natural frequencies of the surface chemistry. In this work, differences in the characteristics of parallel reactions are exploited via selective application of active site dynamics (0 < ΔU < 1.0 eV amplitude, 10<sup>-6</sup> < f < 10<sup>4</sup> Hz frequency) to control the extent of competing reactions occurring on the shared catalytic surface. Simulation of multiple parallel reaction systems with broad range of variation in chemical parameters revealed that parallel chemistries are highly tunable in selectivity between either pure product, even when specific products are not selectively produced under static conditions. Two mechanisms leading to dynamic selectivity control were identified: (i) surface thermodynamic control of one product species under strong binding conditions, or (ii) catalytic resonance of the kinetics of one reaction over the other. These dynamic parallel pathway control strategies applied to a host of chemical conditions indicate significant potential for improving the catalytic performance of many important industrial chemical reactions beyond their existing static performance.

scholarly journals Identification of Active Sites in the Catalytic Oxidation of 2‐Propanol over Co1+xFe2‐xO4 Spinel Oxides at Solid/Liquid and Solid/Gas Interfaces

ChemCatChem ◽  
2021 ◽  
Author(s):  
Tobias Falk ◽  
Eko Budiyanto ◽  
Maik Dreyer ◽  
Christin Pflieger ◽  
Daniel Waffel ◽  
...  
Keyword(s):  
Catalytic Oxidation ◽  
Active Sites ◽  
Spinel Oxides ◽  
Solid Liquid

Co3Fe7 nanoparticles encapsulated in porous nitrogen-doped carbon nanofiber as bifunctional electrocatalysts for rechargeable zinc-air battery

2021 ◽  
Author(s):  
Miaomiao Liu ◽  
Yulong He ◽  
Jintao Zhang
Keyword(s):  
Oxygen Reduction ◽  
Active Sites ◽  
Carbon Nanofiber ◽  
Nitrogen Doped ◽  
Bifunctional Electrocatalysts ◽  
Air Battery ◽  
Nitrogen Doped Carbon ◽  
Carbon Based

Exploration of inexpensitive and high perfomance carbon-based electrocatalyst with abundant active sites for oxygen reduction and evolution reactions is vital for enhancing the performance of zinc air battery. Herein, the...

Highly doped and exposed Cu(i)–N active sites within graphene towards efficient oxygen reduction for zinc–air batteries

2016 ◽  
Vol 9 (12) ◽  
pp. 3736-3745 ◽  
Author(s):  
Haihua Wu ◽  
Haobo Li ◽  
Xinfei Zhao ◽  
Qingfei Liu ◽  
Jing Wang ◽  
...  
Keyword(s):  
Oxygen Reduction ◽  
Active Sites ◽  
High Performance ◽  
High Density ◽  
Catalyst Loading ◽  
Zinc Air Batteries

High-density coordination unsaturated copper(i)–nitrogen embedded in graphene demonstrates a high performance and stability in primary zinc–air batteries with ultralow catalyst loading.

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