Effect of particle size on the electrochemical properties of MmNi3.8Co0.75Mn0.4Al0.2 hydrogen storage alloy

Xiangyu Zhao; Liqun Ma; Yi Ding; Xiaodong Shen

doi:10.1016/j.ijhydene.2009.02.046

Effect of particle size on the electrochemical properties of MmNi_3.8Co_0.75Mn_0.4Al_0.2 hydrogen storage alloy

Xiangyu Zhao, Liqun Ma, Yi Ding, Xiaodong Shen

College of Materials Science and Engineering

Nanjing Tech University

Research output: Contribution to journal › Article › peer-review

22 Scopus citations

Abstract

Charge and discharge testing, linear polarization, electrochemical impedance spectroscopy (EIS) and potential step chronoamperometry (PSCA) were used to investigate the electrochemical properties of the Ce-rich mischmetal MmNi_3.8Co_0.75Mn_0.4Al_0.2 hydrogen storage alloy with different particle sizes. At a discharge current density of 900 mA/g, the alloy with small original particle size maintained a high rate dischargeability (HRD) above 86% while the alloy with large particle size could not discharge in the same potential region. The alloy with small original particle size also showed lower contact resistances and polarization resistance after full activation. Both the exchange current density and the hydrogen diffusion coefficient increased when the hydrogen concentration decreased. The charge-transfer reaction on the surface of alloy particles with different sizes should be mainly responsible for the differences in electrochemical properties, especially the HRD.

Original language	English
Pages (from-to)	3389-3394
Number of pages	6
Journal	International Journal of Hydrogen Energy
Volume	34
Issue number	8
DOIs	https://doi.org/10.1016/j.ijhydene.2009.02.046
State	Published - May 2009

Keywords

Charge-transfer
High rate dischargeability
Hydrogen diffusion
Hydrogen storage alloy
Particle size

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

Access to Document

10.1016/j.ijhydene.2009.02.046

Cite this

@article{7d0734dfd1914c6eafc569ad372e7189,

title = "Effect of particle size on the electrochemical properties of MmNi3.8Co0.75Mn0.4Al0.2 hydrogen storage alloy",

abstract = "Charge and discharge testing, linear polarization, electrochemical impedance spectroscopy (EIS) and potential step chronoamperometry (PSCA) were used to investigate the electrochemical properties of the Ce-rich mischmetal MmNi3.8Co0.75Mn0.4Al0.2 hydrogen storage alloy with different particle sizes. At a discharge current density of 900 mA/g, the alloy with small original particle size maintained a high rate dischargeability (HRD) above 86% while the alloy with large particle size could not discharge in the same potential region. The alloy with small original particle size also showed lower contact resistances and polarization resistance after full activation. Both the exchange current density and the hydrogen diffusion coefficient increased when the hydrogen concentration decreased. The charge-transfer reaction on the surface of alloy particles with different sizes should be mainly responsible for the differences in electrochemical properties, especially the HRD.",

keywords = "Charge-transfer, High rate dischargeability, Hydrogen diffusion, Hydrogen storage alloy, Particle size",

author = "Xiangyu Zhao and Liqun Ma and Yi Ding and Xiaodong Shen",

year = "2009",

month = may,

doi = "10.1016/j.ijhydene.2009.02.046",

language = "英语",

volume = "34",

pages = "3389--3394",

journal = "International Journal of Hydrogen Energy",

issn = "0360-3199",

publisher = "Elsevier Ltd",

number = "8",

}

TY - JOUR

T1 - Effect of particle size on the electrochemical properties of MmNi3.8Co0.75Mn0.4Al0.2 hydrogen storage alloy

AU - Zhao, Xiangyu

AU - Ma, Liqun

AU - Ding, Yi

AU - Shen, Xiaodong

PY - 2009/5

Y1 - 2009/5

N2 - Charge and discharge testing, linear polarization, electrochemical impedance spectroscopy (EIS) and potential step chronoamperometry (PSCA) were used to investigate the electrochemical properties of the Ce-rich mischmetal MmNi3.8Co0.75Mn0.4Al0.2 hydrogen storage alloy with different particle sizes. At a discharge current density of 900 mA/g, the alloy with small original particle size maintained a high rate dischargeability (HRD) above 86% while the alloy with large particle size could not discharge in the same potential region. The alloy with small original particle size also showed lower contact resistances and polarization resistance after full activation. Both the exchange current density and the hydrogen diffusion coefficient increased when the hydrogen concentration decreased. The charge-transfer reaction on the surface of alloy particles with different sizes should be mainly responsible for the differences in electrochemical properties, especially the HRD.

AB - Charge and discharge testing, linear polarization, electrochemical impedance spectroscopy (EIS) and potential step chronoamperometry (PSCA) were used to investigate the electrochemical properties of the Ce-rich mischmetal MmNi3.8Co0.75Mn0.4Al0.2 hydrogen storage alloy with different particle sizes. At a discharge current density of 900 mA/g, the alloy with small original particle size maintained a high rate dischargeability (HRD) above 86% while the alloy with large particle size could not discharge in the same potential region. The alloy with small original particle size also showed lower contact resistances and polarization resistance after full activation. Both the exchange current density and the hydrogen diffusion coefficient increased when the hydrogen concentration decreased. The charge-transfer reaction on the surface of alloy particles with different sizes should be mainly responsible for the differences in electrochemical properties, especially the HRD.

KW - Charge-transfer

KW - High rate dischargeability

KW - Hydrogen diffusion

KW - Hydrogen storage alloy

KW - Particle size

UR - http://www.scopus.com/inward/record.url?scp=64449085697&partnerID=8YFLogxK

U2 - 10.1016/j.ijhydene.2009.02.046

DO - 10.1016/j.ijhydene.2009.02.046

M3 - 文章

AN - SCOPUS:64449085697

SN - 0360-3199

VL - 34

SP - 3389

EP - 3394

JO - International Journal of Hydrogen Energy

JF - International Journal of Hydrogen Energy

IS - 8

ER -