Mass-producible polyhedral macrotube carbon arrays with multi-hole cross-section profiles: superb 3D tertiary porous electrode materials for supercapacitors and capacitive deionization cells

2020 ◽  
Vol 8 (32) ◽  
pp. 16312-16322
Author(s):  
Xiumei Ma ◽  
Qinghao Wu ◽  
Wei (Alex) Wang ◽  
Shanfu Lu ◽  
Yan Xiang ◽  
...  
Keyword(s):  
Cross Section ◽  
Electrode Materials ◽  
Porous Electrode ◽  
Capacitive Deionization

Mass-producible polyhedral macrotube carbon arrays with tertiary pores were prepared and used as superb materials for supercapacitors and capacitive deionization.

3D hierarchical porous N-doped carbon quantum dots/vanadium nitride hybrid microflowers as a superior electrode material toward high-performance asymmetric capacitive deionization

2021 ◽  
Author(s):  
Jingxuan Zhao ◽  
Zhibo Zhao ◽  
Yang Sun ◽  
Xiangdong Ma ◽  
Meidan Ye ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Electrode Material ◽  
High Performance ◽  
Carbon Nanomaterials ◽  
Electrode Materials ◽  
Carbon Quantum Dots ◽  
Vanadium Nitride ◽  
Capacitive Deionization ◽  
Hierarchical Porous

Taking into account of time-confusing preparation processing and unsatisfied desalination capacity of carbon nanomaterials, exploring efficient electrode materials remains a great challenge for practical capacitive deionization (CDI) application. In this...

Review on carbon-based composite materials for capacitive deionization

RSC Advances ◽  
2015 ◽  
Vol 5 (20) ◽  
pp. 15205-15225 ◽  
Author(s):  
Yong Liu ◽  
Chunyang Nie ◽  
Xinjuan Liu ◽  
Xingtao Xu ◽  
Zhuo Sun ◽  
...  
Keyword(s):  
Composite Materials ◽  
Metal Oxide ◽  
Composite Electrode ◽  
Electrode Materials ◽  
Capacitive Deionization ◽  
Polymer Metal ◽  
Carbon Based

Carbon-based composite electrode materials, including carbon–carbon, carbon–metal oxide, carbon–polymer and carbon–polymer–metal oxide for efficient capacitive deionization are summarized.

Effect of Channel Geometry on the Dynamics of a Water Droplet in a Microchannel

2008 ◽  
Author(s):  
Xun Zhu ◽  
P. C. Sui ◽  
Ned Djilali
Keyword(s):  
Cross Section ◽  
Liquid Water ◽  
Water Droplet ◽  
Gas Flow ◽  
Porous Electrode ◽  
Flow Characteristics ◽  
Proton Exchange ◽  
Bottom Wall ◽  
Gas Channel ◽  
Baseline Case

The objective of the present study is to investigate the effects of the microchannel geometry on the dynamic behaviour of liquid water emerging from a pore into a microchannel of a cross gas flow. The flow characteristics are resolved using the volume-of-fluid (VOF) method in conjunction with an interface tracking technique. A microchannel with dimensions of a typical proton exchange membrane fuel cell (PEMFC) gas channel (a square cross section of 250 μm in width) and a pore of 50 μm in diameter on the bottom wall is adopted as the baseline case. Simulations for microchannels of different cross sections, including trapezoid, upside-down trapezoid, triangle, rectangle, and rectangle with a arch bottom wall, are performed and the results are compared with the baseline case. The evolution of liquid water includes stages identified as emergence, growth, deformation, detachment, and remove. The simulations show that the cross section of the microchannel has significant impacts on the dynamics of the water droplet. The detachment time and diameter and the remove time of the water droplet are found to be in this order: triangle < trapezoid < rectangle with arch bottom wall < rectangle < upside-down trapezoid. The present study will advance our understanding in the transport of liquid water in a PEMFC where water is produced in the catalyst layer and flows through the pores of the porous electrode to the gas channel.

scholarly journals Modification of Metal-Organic Framework-Derived Nanocarbons for Enhanced Capacitive Deionization Performance: A Mini-Review

2020 ◽  
Vol 8 ◽  
Author(s):  
Peng Lin ◽  
Maoxin Liao ◽  
Tao Yang ◽  
Xinran Sheng ◽  
Yue Wu ◽  
...  
Keyword(s):  
Large Scale ◽  
Carbon Nanomaterials ◽  
Electrode Materials ◽  
Low Cost ◽  
Metal Organic Framework ◽  
Morphology Control ◽  
Capacitive Deionization ◽  
Treatment Technology ◽  
Heteroatom Doping ◽  
Metal Organic

Capacitive deionization (CDI) is a promising electrochemical water treatment technology. Development of new electrode materials with higher performance is key to improve the desalination efficiency of CDI. Carbon nanomaterials derived from metal–organic frameworks (MOFs) have attracted wide attention for their porous nanostructures and large specific surface areas. The desalination capacity and cycling stability of MOF-derived carbons (MOFCs) have been greatly improved by means of morphology control, heteroatom doping, Faradaic material modification, etc. Despite progress has been made to improve their CDI performance, quite a lot of MOFCs are too costly to be applied in a large scale. It remains crucial to develop MOFCs with both high desalination efficiency and low cost. In this review, we summarized three modification methods of MOFCs, namely morphology control, heteroatom doping, and Faradaic material doping, and put forward some constructive advice on how to enhance the desalination performance of MOFCs effectively at a low cost. We hope that more efforts could be devoted to the industrialization of MOFCs for CDI.

scholarly journals Removal of lead ions from water by capacitive deionization electrode materials derived from chicken feathers

2019 ◽  
Vol 9 (3) ◽  
pp. 282-291 ◽  
Author(s):  
T. Alfredy ◽  
Y. A. C. Jande ◽  
T. Pogrebnaya
Keyword(s):  
Electrode Materials ◽  
High Surface ◽  
High Surface Area ◽  
Koh Activation ◽  
Capacitive Deionization ◽  
Activation Temperature ◽  
Variable Parameters ◽  
Chicken Feathers ◽  
Bet Method ◽  
Removal Of Heavy Metals

Abstract Capacitive deionization (CDI) is a promising and rapidly growing technology for water treatment and the electrode materials play a key role in improving CDI performance. In this study, high surface area activated carbon was prepared from chicken feather (CF) bio-waste through pyrolysis and KOH activation; the KOH:CF ratio (R) and activation temperature (Ta) were variable parameters. The material was characterized by using the Brunauer, Emmett and Teller (BET) method, Fourier transform infrared (FTIR) spectroscopy and scanning electron microscopy (SEM). The lead (Pb2+) removal test was performed with a CDI cell containing the fabricated carbon electrode and 100 mg L−1 Pb(NO3)2 solution; the sample prepared with the ratio R of 1:1 and Ta = 800 °C exhibited higher Pb2+ removal efficiency of 81% and electro sorption capacity of 4.1 mg g−1 at the electrode potential 1.2 V and flow rate 5 mL min−1. Therefore, CF-derived carbon is considered as a promising CDI electrode material for removal of heavy metals from waste water.

scholarly journals Design and Construction of Graphene-Based Electrode Materials for Capacitive Deionization

2017 ◽  
Vol 33 (7) ◽  
pp. 1338-1353 ◽  
Author(s):  
Lei WANG ◽  
◽  
Fei YU ◽  
Jie MA ◽  
◽  
...  
Keyword(s):  
Electrode Materials ◽  
Capacitive Deionization ◽  
Design And Construction

Highly-dispersed Fe2O3@C electrode materials for Pb2+ removal by capacitive deionization

Carbon ◽  
2019 ◽  
Vol 153 ◽  
pp. 12-20 ◽  
Author(s):  
Haiying Wang ◽  
Yingjie He ◽  
Liyuan Chai ◽  
Huang Lei ◽  
Weichun Yang ◽  
...  
Keyword(s):  
Electrode Materials ◽  
Capacitive Deionization ◽  
Highly Dispersed

Electrochemical Characterization of Nickel-Phosphorus Based Coatings Containing Cobalt

2015 ◽  
Vol 228 ◽  
pp. 299-304
Author(s):  
Magdalena Popczyk ◽  
B. Łosiewicz ◽  
Eugeniusz Łągiewka ◽  
A. Budniok
Keyword(s):  
Electrode Materials ◽  
Electrochemical Impedance ◽  
Porous Electrode ◽  
Absorption Spectrometry ◽  
X Ray Diffraction ◽  
Morphology Characterization ◽  
Galvanostatic Conditions ◽  
Matrix Powder ◽  
Xrd Method

The Ni-P, Ni-Co-P and Ni-P+Co coatings were obtained in galvanostatic conditions at the current density ofjdep= -200 mA cm-2. A stereoscopic microscope was used for surface morphology characterization of the coatings. The X-ray diffraction (XRD) method was used to determine phase composition of the coatings and the atomic absorption spectrometry (AAS) was applied to specify their chemical composition. The behavior of the obtained coatings was investigated in the process of hydrogen evolution reaction (HER) from 5 M KOH using steady-state polarization and electrochemical impedance spectroscopy (EIS) methods. It was found that introduction into Ni-P amorphous matrix powder of cobalt produced porous electrode materials which could be used for the HER.

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