N,P co-doped carbon microsphere as superior electrocatalyst for VO2+/VO2+ redox reaction
N,P co-doped carbon microsphere as superior electrocatalyst for VO2+/VO2+ redox reaction
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N,P共掺杂碳微球作为VO2 /VO2氧化还原反应的优异电催化剂
DOI：
10.1016/j.electacta.2017.10.169
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发表时间：
2018-01-01
影响因子：
6.6
通讯作者：
Dai, Lei
中科院分区：
文献类型：
--
作者：
He, Zhangxing;Jiang, Yingqiao;Dai, Lei
本文研究了N，P共掺杂碳微球（CMS-NP）作为钒液流电池VO 2 + /VO 2+氧化还原反应的电催化剂。以（NH 4）（2）HPO 4为氮源和磷源，通过水热处理和煅烧制备了CMS-NP。X射线光电子能谱证实了N、P原子进入了碳微球的碳骨架，共掺杂对其形貌没有明显影响。与原始CMS和N单掺杂CMS相比，CMS-NP上的VO 2 + /VO 2+氧化还原反应表现出最好的电化学动力学。组装了以CMS为电催化剂的电池，并对其电化学性能进行了评价。CMS样品的加入改善了电池的综合储能性能，提高了电池的放电容量和能量效率。CMS-NP使电池在50 mA cm ~（-2）时的平均能量效率提高了5.1%。CMS-NP的上级电催化性能主要归因于其独特的结构特征所带来的活性中心杂原子总数的增加和N、P共掺杂的协同效应。研究表明，N、P共掺杂有利于碳骨架上VO 2 + /VO 2+氧化还原反应的电化学动力学，CMS-NP可作为上级电催化剂用于正极。(c)2017爱思唯尔有限公司版权所有
In this paper, N,P co-doped carbon microsphere (CMS-NP) was investigated as electrocatalyst for VO2+ / VO2+ redox reaction for vanadium redox flow batteries. CMS-NP was prepared by hydrothermal treatment followed by calcination with (NH4)(2)HPO4 as N and P sources. X-ray photoelectron spectroscopy confirms the incorporation of N and P atoms into carbon frameworks of carbon microsphere (CMS), and co-doping has no obvious influence on its morphology. The VO2+ / VO2+ redox reaction on CMS-NP exhibits the best electrochemical kinetics compared with pristine CMS and N mono-doped CMS. The cell using CMS samples as electrocatalyst was assembled and its electrochemical performance was evaluated. The comprehensive energy storage performances of the cell are improved by using CMS samples, leading to higher discharge capacity and energy efficiency. The average energy efficiency of the cell increases by 5.1% at 50 mA cm(-2) by using CMS-NP. The superior electrocatalytic properties of CMS-NP is mainly ascribed to the increased total number of heteroatoms as active sites and synergistic effect of N, P co-doping resulting from the unique structural features. Our study reveals that N, P co-doping is beneficial for the electrochemical kinetics of VO2+ / VO2+ redox reaction on carbon frameworks, and CMS-NP can be employed as superior electrocatalyst in positive electrode. (c) 2017 Elsevier Ltd. All rights reserved.