Boosting Oxygen Reduction Activity of Manganese Oxide Through Strain
Boosting Oxygen Reduction Activity of Manganese Oxide Through Strain
复制标题
通过菌株提高氧化锰的氧还原活性
DOI：
10.1002/smll.202105201
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发表时间：
2022
期刊：
影响因子：
13.3
通讯作者：
Lu Zunming
中科院分区：
文献类型：
--
作者：
Hao Yixin;Sun Shuo;Du Xihua;Qu Jiangtao;Li Lanlan;Yu Xiaofei;Zhang Xinghua;Yang Xiaojing;Zheng Rongkun;Cairney Julie M.;Lu Zunming
Transition‐metal oxides with a strain effect have attracted immense interest as cathode materials for fuel cells. However, owing to the introduction of heterostructures, substrates, or a large number of defects during the synthesis of strain‐bearing catalysts, not only is the structure–activity relationship complicated but also their performance is mediocre. In this study, a mode of strain introduction is reported. Transition‐metal ions with different electronegativities are intercalated into the cryptomelane‐type manganese oxide octahedral molecular sieves (OMS‐2) structure with K ions as the template, resulting in the octahedral structural distortion of MnO6and producing strains of different degrees. Experimental studies reveal that Ni‐OMS‐2 with a high compressive strain (4.12%) exhibits superior oxygen reduction performance with a half‐wave potential (0.825 V vs RHE) greater than those of other reported manganese‐based oxides. This result is related to the increase in the covalence of MnO6octahedral configuration and shifting down of theegband center caused by the higher compression strain. This research avoids the introduction of new chemical bonds in the main structure, weakens the effect ofegelectron filling number, and emphasizes the pure strain effect. This concept can be extended to other transition‐metal‐oxide catalysts.
