Ni–Mo modified metal–organic frameworks for high-performance supercapacitance and enzymeless H2O2 detection,CrystEngComm

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Ni–Mo modified metal–organic frameworks for high-performance supercapacitance and enzymeless H2O2 detection
CrystEngComm ( IF 2.6 ) Pub Date : 2020-07-06 , DOI: 10.1039/d0ce00666a
Yue Li _{1,

2,

3} , Kamdem Pascal _{4,

5,

6} , Xiao-Juan Jin _{1,

2,

3}

Affiliation

In this work, we synthesized A(B)-Ni_xMo_y-MOFs@AAC hybrids with different molar ratios of nickel and molybdenum through a liquid phase method and a hydrothermal method. The irregularly shaped Ni/Mo nanoparticles are closely anchored on the surface of the MOFs and the A(B)-Ni_xMo_y-MOFs are supported on the acidified activated carbon (AAC) with a size of ∼6 nm. Interestingly, the MOF particles are hexahedral under mild liquid conditions and present a cubic shape under hydrothermal conditions. The A(B)-Ni_xMo_y-MOFs@AAC hybrids were tested using transmission electron microscopy (TEM), contact angle measurements, X-ray photoelectron spectroscopy (XPS) and X-ray diffraction (XRD) analytical techniques. The prepared A(B)-Ni_xMo_y-MOFs@AAC hybrids were then used as electrode materials. In particular, the A(B)-Ni₁Mo_0.5-MOFs@AAC electrode exhibited excellent electrochemical properties, with a high specific capacitance (1178 F g⁻¹ at 0.5 A g⁻¹ for the A-Ni₁Mo_0.5-MOFs@AAC electrode and 1145.7 F g⁻¹ at 0.5 A g⁻¹ for the B-Ni₁Mo_0.5-MOFs@AAC electrode), and exceptional stability (83.40% maintenance of specific capacitance for the A-Ni₁Mo_0.5-MOFs@AAC electrode and 78.31% maintenance for the B-Ni₁Mo_0.5-MOFs@AAC electrode at 15 A g⁻¹). Meanwhile, the as-obtained A(B)-Ni₁Mo_0.5-MOFs@AAC//AAC achieved a high energy density of 85.83 W h kg⁻¹ to 54.05 W h kg⁻¹ (A-Ni₁Mo_0.5-MOFs@AAC//AAC) and from 68.26 to 36.07 W h kg⁻¹ (B-Ni₁Mo_0.5-MOFs@AAC//AAC) based on the total mass of active material at a current density in the range of 1 to 25 A g⁻¹. In addition, the A(B)-Ni_xMo_y-MOFs@AAC hybrids were also employed as nonenzymatic sensors for the electrochemical detection of H₂O₂, and exhibited high sensitivity (0.277 μA μM⁻¹ for the A-Ni₁Mo_0.5-MOFs@AAC sensor and 0.188 μA μM⁻¹ for the B-Ni₁Mo_0.5-MOFs@AAC sensor) and noteworthy low detection limits of 0.185 and 0.303 μM based on 3 signal–noise ratios, respectively. Therefore, we expect that the A(B)-Ni₁Mo_0.5-MOFs@AAC electrodes as electrode materials would have potential applications in supercapacitors and the nonenzymatic detection of H₂O₂.

中文翻译：

用于高性能超级电容和无酶H2O2检测的Ni-Mo修饰金属有机框架

在这项工作中，我们通过液相法和水热法合成了具有不同摩尔比的镍和钼的A（B）-Ni _x Mo _y -MOFs @ AAC杂化物。不规则形状的Ni / Mo纳米颗粒紧密地锚定在MOF的表面上，并且A（B）-Ni _x Mo _y -MOFs负载在大小约为6 nm的酸化活性炭（AAC）上。有趣的是，MOF颗粒在温和的液体条件下为六面体，在水热条件下呈立方体形状。A（B）-Ni _x Mo _y-MOFs @ AAC杂种使用透射电子显微镜（TEM），接触角测量，X射线光电子能谱（XPS）和X射线衍射（XRD）分析技术进行了测试。然后将制备的A（B）-Ni _x Mo _y -MOFs @ AAC杂化物用作电极材料。特别地，A（B）-Ni ₁ Mo _0.5 -MOFs @ AAC电极表现出优异的电化学性能，具有高的比电容（对于A-Ni ₁ Mo _0.5 -MOFs在0.5 A g ^-1时为1178 F g ^-1 @AAC电极和对于B-Ni ₁ Mo _0.5为0.5 A g ^-1时的1145.7 F g ^-1-MOFs @ AAC电极），和特殊的稳定性（对于A-镍比电容的83.40％维护₁沫_0.5 -MOFs @ AAC电极和78.31％维修为B-的Ni ₁沫_0.5 -MOFs @ AAC电极在15A g ^-1）。同时，如此获得的A（B）-Ni ₁ Mo _0.5 -MOFs @ AAC // AAC达到了85.83 W h kg ^-1至54.05 W h kg ^-1（A-Ni ₁ Mo _0.5 -MOFs @ AAC // AAC）和68.26至36.07 W h kg ^-1（B-Ni ₁ Mo _0.5-MOFs @ AAC // AAC），其基于在1至25 A g ^-1的电流密度下的活性材料的总质量。此外，A（B）-Ni _X沫_ý -MOFs @ AAC杂种也用作非酶传感器，用于H的电化学检测₂ Ò ₂，并且表现出高灵敏度（0.277μAμM ^-1为A的Ni ₁沫_0.5 -MOFs @ AAC传感器和0.188μAμM ^-1为B-的Ni ₁沫_0.5 -MOFs @ AAC传感器）和根据3信号噪声比，分别0.185 0.303和μM的值得注意的低的检出限。因此，我们期望A（B）-Ni ₁ Mo_0.5 -MOFs @ AAC电极作为电极材料将具有在超级电容器和潜在的应用H的非酶检测₂ Ò₂。

更新日期：2020-08-10

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