Here, we report a facile strategy to synthesize MgCo₂O₄ with abundant oxygen vacancies (OV-MgCo₂O₄) using for the electrode materials of asymmetric supercapacitors (ACS). Benefiting from the NaBH₄ reduction treatment to offer oxygen vacancies, the specific capacitance of OV-MgCo₂O₄ was improved to 460 F g⁻¹ (1 A g⁻¹), much higher than untreated MgCo₂O₄ (340 F g⁻¹ at 1 A g⁻¹). We fabricated OV-MgCo₂O₄//AC ACS device to investigate the further application of OV-MgCo₂O₄. This hybrid ACS exhibits excellent specific capacity of 52.5 F g⁻¹ (0.4 A g⁻¹), with a great energy density of 18.7 Wh kg⁻¹ (320 W kg⁻¹). Our work demonstrates the important role of oxygen vacancies in improving the capacity of metal oxides.

在这里，我们报告了一种用于不对称超级电容器（ACS）电极材料的合成方法，该方法具有高的氧空位（OV-MgCo ₂ O ₄）来合成MgCo ₂ O ₄。受益于NaBH ₄还原处理提供的氧空位，OV-MgCo ₂ O ₄的比电容提高到460 F g ^-1（1 A g ^-1），远高于未处理的MgCo ₂ O ₄（340 F g）^-1在1 A g ^-1）。我们制造了OV-MgCo ₂ O ₄// AC ACS设备以研究OV-MgCo ₂ O ₄的进一步应用。该混合型ACS具有52.5 F g ^-1（0.4 A g ^-1）的出色比容量，并且具有18.7 Wh kg ^-1（320 W kg ^-1）的大能量密度。我们的工作证明了氧空位在提高金属氧化物容量方面的重要作用。