Synthesis and ORR electrocatalytic activity of mixed Mn–Co oxides derived from divalent metal-based MIL-53 analogues,Dalton Transactions

当前位置： X-MOL 学术 › Dalton Trans. › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

Synthesis and ORR electrocatalytic activity of mixed Mn–Co oxides derived from divalent metal-based MIL-53 analogues
Dalton Transactions ( IF 3.5 ) Pub Date : 2017-10-10 00:00:00 , DOI: 10.1039/c7dt03386a
Lili Yao _{1,

2,

3,

4,

5} , Wenxiu Yang _{2,

5,

6,

7,

8} , Huiling Liu _{9,

10,

11,

12,

13} , Jianbo Jia _{2,

3,

4,

5,

8} , Guohua Wu _{5,

14,

15,

16} , Dan Liu _{9,

10,

11,

12,

13} , Ting Liu _{1,

2,

3,

4,

5} , Taixing Tan _{1,

2,

3,

4,

5} , Cheng Wang _{9,

10,

11,

12,

13}

Affiliation

State Key Laboratory of Rare Earth Resource Utilization
Changchun Institute of Applied Chemistry
Chinese Academy of Sciences
Changchun
P. R. China
University of Chinese Academy of Sciences
Beijing
State Key Laboratory of Electroanalytical Chemistry
Tianjin Key Laboratory of Advanced Functional Porous Materials and Center for Electron Microscopy
Institute for New-Energy Materials & Low-Carbon Technologies
School of Materials Science and Engineering
Tianjin University of Technology
Tianjin 300084
College of Biotechnology
Jiangsu University of Science and Technology
Zhenjiang

The design of efficient mixed Mn–Co oxides as oxygen reduction reaction (ORR) electrocatalysts in alkaline media has been boosted nowadays. Recently, multivariant MOFs have been demonstrated as versatile precursors to construct these mixed metal oxides. Herein, we synthesized four mixed Mn–Co oxide samples via simply annealing their MIL-53 precursors with different Co/Mn molar ratios. These four samples were dominated by three kinds of Mn–Co spinel phases. The mixed Mn–Co oxides showed enhanced ORR performances compared with the single metal counterparts in alkaline media. In particular, the sample containing a pure MnCo₂O₄ phase exhibited the highest activity with a half-wave potential of 0.772 V (vs. RHE), only 40 mV negative compared with that of commercial Pt/C. The H₂O₂ yield was calculated to be below 12.1%, corresponding to the high diffusion-limited current density along with the high electron transfer number. The surface defects, active Mn⁴⁺/Mn³⁺ and electrochemically active surface area together affected the ORR performances of these mixed Mn–Co oxides. The present work highlights the facile controllability of divalent MIL-53 analogues for highly efficient mixed Mn–Co oxides in ORR electrocatalysis.

中文翻译：

源自二价金属基MIL-53类似物的Mn-Co混合氧化物的合成及ORR电催化活性

如今，在碱性介质中作为氧还原反应（ORR）电催化剂的高效混合Mn-Co氧化物的设计得到了加强。最近，多变量MOF已被证明是构建这些混合金属氧化物的通用前体。本文中，我们通过简单地退火具有不同Co / Mn摩尔比的MIL-53前体，合成了四个混合的Mn-Co氧化物样品。这四个样品主要由三种Mn-Co尖晶石相组成。与碱性介质中的单金属同行相比，混合的Mn-Co氧化物表现出更高的ORR性能。尤其是，含有纯MnCo ₂ O ₄相的样品表现出最高的活性，半波电位为0.772 V（vs.RHE），与商用Pt / C相比只有40 mV负值。计算出的H ₂ O ₂产率低于12.1％，这对应于高的扩散限制电流密度以及高的电子转移数。表面缺陷，活性Mn ⁴⁺ / Mn ³⁺和电化学活性表面积共同影响这些混合的Mn-Co氧化物的ORR性能。本工作强调了二价MIL-53类似物在ORR电催化中高效混合Mn-Co氧化物的简便可控性。

更新日期：2017-11-15

点击分享查看原文

点击收藏

阅读更多本刊最新论文本刊介绍/投稿指南11