Cobalt-doped MnO2 ultrathin nanosheets with abundant oxygen vacancies supported on functionalized carbon nanofibers for efficient oxygen evolution
Cobalt-doped MnO2 ultrathin nanosheets with abundant oxygen vacancies supported on functionalized carbon nanofibers for efficient oxygen evolution
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功能化碳纳米纤维上具有丰富氧空位的钴掺杂 MnO2 超薄纳米片，可有效析氧
DOI：
10.1016/j.nanoen.2018.10.008
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发表时间：
2018-12
期刊：
影响因子：
17.6
通讯作者：
Wang Guoxiu
中科院分区：
文献类型：
--
作者：
Zhao Yufei;Zhang Jinqiang;Wu Wenjian;Guo Xin;Xiong Pan;Liu Hao;Wang Guoxiu
开发低成本、高效率、高活性、高稳定性的析氧反应催化剂仍然是一个巨大的挑战。在此，我们报道了一种简单的自发氧化还原反应，在钴/氮共官能化碳纳米纤维（Co-MnO 2）上原位生长具有丰富的氧空位垂直排列的钴掺杂MnO 2纳米片|OV）作为有效的OER催化剂。证实了金属钴在氧化还原反应过程中形成长而宽的MnO 2纳米片中起着关键作用。此外，钴离子掺杂显著提高了MnO 2纳米片的催化活性。得益于掺杂策略、快速电荷转移动力学和强协同耦合效应的协同优势，Co-MnO 2| OV复合材料表现出优异的催化活性和良好的电化学水氧化耐久性，在279 mV的过电位下达到10 mA cm− 2。根据密度泛函理论（DFT）计算，催化活性的提高主要是由于掺杂Co提高了催化剂的电导率，降低了OH-在邻近O位和氧空位上的吸附能垒。我们的研究结果表明，控制材料的结构和组成可以实现高效的析氧电催化剂。
Developing low-cost and efficient catalysts for oxygen evolution reactions (OER) with both excellent activity and robust stability remains a great challenge. Herein, we report a facile spontaneous redox reaction to grow cobalt-doped MnO2ultrathin nanosheetsin situwith abundant oxygen vacancies vertically aligned on cobalt/nitrogen co-functionalized carbon nanofibers (Co-MnO2|OV) as an efficient OER catalyst. It is confirmed that metallic cobalt plays a critical role in the formation of long and ultrathin MnO2nanosheets during the redox reaction. Furthermore, the cobalt ions doped into MnO2significantly enhance the catalytic activity of MnO2nanosheets. Benefiting from the collaborative advantages of doping strategy, fast charge transfer kinetics and strong synergistic coupling effects, Co-MnO2|OVcomposites exhibit an excellent catalytic activity and a good durability for electrochemical water oxidation, reaching 10 mA cm−2at an overpotential of 279 mV. According to the density functional theory (DFT) calculations, the enhanced catalytic activity mainly originates from a better conductivity and the decreased adsorption energy barrier of OH-on the O sites neighboring the doped Co and oxygen vacancies. Our findings suggest that the control over the structure and composition of the materials can achieve highly efficient oxygen evolution electrocatalysts.
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影响因子：
17.1
作者：
通讯作者：
--
影响因子：
--
作者：
Yufei Zhao;Jinqiang Zhang;Xin Guo;H. Fan;Wenjian Wu;Hao Liu;Guoxiu Wang
通讯作者：
Yufei Zhao;Jinqiang Zhang;Xin Guo;H. Fan;Wenjian Wu;Hao Liu;Guoxiu Wang
超薄磁黄铁矿 Fe7S8 纳米片中的高活性 Fe 位点实现高效电催化析氧
影响因子：
18.2
作者：
Chen S;Kang Z;Zhang X;Xie J;Wang H;Shao W;Zheng X;Yan W;Pan B;Xie Y
通讯作者：
Xie Y
影响因子：
16.6
作者：
Lee, Sanghan;Nam, Gyutae;Cui, Yi
通讯作者：
Cui, Yi
影响因子：
32.5
作者：
Baicheng Weng;Fenghua Xu;Changlei Wang;Weiwei Meng;C. Grice;Yanfa Yan
通讯作者：
Baicheng Weng;Fenghua Xu;Changlei Wang;Weiwei Meng;C. Grice;Yanfa Yan