Nanoplates and Nanospheres of Co3(VO4)2 as Noble Metal-free Electrocatalysts for Oxygen Evolution
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- 作者：Mingshu Xiao1 ; Dazhang Yang1 ; Yuhua Yan1 ; Yanping Tian1 ; Mao Zhou ; Meifeng Hao ; Rui Cheng ; Yuqing Miao ; yqmiao@usst.edu.cn" class="auth_mail" title="E-mail the corresponding author ; 837924666@qq.com" class="auth_mail" title="E-mail the corresponding author
- 关键词：Oxygen evolution reaction ; Co3(VO4)2 ; Electrocatalyst ; electrochemical water splitting
- 刊名：Electrochimica Acta
- 出版年：2015
- 出版时间：20 October 2015
- 年：2015
- 卷：180
- 期：Complete
- 页码：260-267
- 全文大小：1718 K
文摘
The Co3(VO4)2 multilayer nanoplates [Co3(VO4)2-MNs] and Co3(VO4)2 ultrafine particle-comprised nanospheres [Co3(VO4)2-UPNs] were prepared for the oxygen evolution reaction (OER). They are synthesized by a simple hydrothermal reaction using ethylenediaminetetraacetic acid and polyvinyl pyrrolidone as dispertants and pretectants. With the help of multi-walled carbon nanotubes (MWCNTs), the Co3(VO4)2-MNs and Co3(VO4)2-UPNs were immobilized respectivtly onto the surface of glassy carbon electrodes (GCEs). By comparison, the GCE–Co3(VO4)2-MN/MWCNT exhibits higher performance of OER electrocatalysis and better stablity than the GCE–Co3(VO4)2-UPN/MWCNT in the alkali electrolyte of 1 M KOH due to its higher surface roughness. The high surface free energy of Co3(VO4)2-MNs is helpful for their immobilization on elelctrode surface, leading a better stability. The work shows that the noble metal-free electrocatalysts can lower the energy barrier and improve the energy efficiency for electrochemical water splitting to generate hydrogen.