Mesoporous NiO with a single-crystalline structure utilized as a noble metal-free catalyst for non-aqueous Li-O-2 batteries
Mesoporous NiO with a single-crystalline structure utilized as a noble metal-free catalyst for non-aqueous Li-O-2 batteries
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具有单晶结构的介孔NiO用作非水Li-O-2电池的无贵金属催化剂
DOI：
10.1039/c5ta03685b
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发表时间：
2015
影响因子：
11.9
通讯作者：
Zhou Haoshen
中科院分区：
文献类型：
--
作者：
Tong Shengfu;Zheng Mingbo;Lu Yong;Lin Zixia;Li Jun;Zhang Xueping;Shi Yi;He Ping;Zhou Haoshen
研究了具有单晶结构的介孔NiO纳米片作为非水Li-O2电池中的氧电极催化剂。NiO基Li-O2电池达到的再充电电压平台约为100 V。3.95 V，ca.与β-Ni（OH）2和乙炔黑相比，200 mV负移。对NiO基Li-O2电池充电过程中的反应机理进行了深入研究。X射线光电子能谱表征结果表明，在放电过程中生成了Li 2 O2和Li 2CO 3，充电后可分解。这表明NiO纳米片对Li 2 O2和Li 2CO 3具有良好的分解活性。此外，气相色谱-质谱测试的结果反映了补给过程的两个步骤，即，当电位低于4.0V时Li 2 O2的氧化以及当电位高于4.0V时Li 2 O2和Li 2CO 3的分解。此外，当容量被限制为500 mA h g-1时，即使在40次循环之后，在NiO基电池中也没有观察到明显的性能衰减，表明令人印象深刻的循环性能。
Mesoporous NiO nanosheets with a single-crystalline structure were investigated as an oxygen electrode catalyst in a non-aqueous Li–O2 battery. The recharge voltage plateau achieved for the NiO-based Li–O2 battery was ca. 3.95 V, ca. 200 mV negatively shifted compared with that for β-Ni(OH)2 and acetylene black. The reaction mechanism during the charge process for the NiO-based Li–O2 battery was intensively researched. The results of X-ray photoelectron spectroscopy characterization indicated that Li2O2 and Li2CO3 were formed during the discharge process, which can be decomposed after recharge. These demonstrated that the NiO nanosheet exhibited a good activity for the decomposition of Li2O2 and Li2CO3. Furthermore, the results of the gas chromatography-mass spectrometry test reflected two steps of the recharge process, i.e., the oxidation of Li2O2 when the potential was below 4.0 V and the decomposition of Li2O2 and Li2CO3 when the potential was above 4.0 V. Moreover, no obvious performance decay was observed in the NiO-based battery even after 40 cycles when the capacity was limited to 500 mA h g−1, indicating an impressive cycling performance.