Controlled Selenium Infiltration of Cobalt Phosphide Nanostructure Arrays from a Two-Dimensional Cobalt Metal–Organic Framework: A Self-Supported Electrode for Flexible Quasi-Solid-State Asymmetric Supercapacitors,ACS Applied Energy Materials

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Controlled Selenium Infiltration of Cobalt Phosphide Nanostructure Arrays from a Two-Dimensional Cobalt Metal–Organic Framework: A Self-Supported Electrode for Flexible Quasi-Solid-State Asymmetric Supercapacitors
ACS Applied Energy Materials ( IF 5.4 ) Pub Date : 2020-12-18 , DOI: 10.1021/acsaem.0c02340
Kisan Chhetri ₁ , Bipeen Dahal ₁ , Arjun Prasad Tiwari ₂ , Tanka Mukhiya ₁ , Alagan Muthurasu ₁ , Gunendra Prasad Ojha ₁ , Minju Lee ₁ , Taewoo Kim ₁ , Su-Hyeong Chae ₁ , Hak Yong Kim _{1,

3}

Affiliation

Various hybrid materials containing transitional metals (TMs) with selenium (Se) have been widely studied, but the controlled infiltration of Se in a cobalt phosphide nanostructured array (CPNA) derived from a two-dimensional cobalt metal–organic Framework (2D Co-MOF) is the different approach of material design for energy storage applications. In this work, 2D Co-MOF arrays are successfully grown on an activated carbon fiber textile (ACFT) and converted into Se_x@CPNA-ACFT through successive phosphidization and selenium infiltration processes under the optimized conditions. In the three-electrode system, Se_0.6@CPNA-ACFT shows a higher specific capacity of ∼302 mAh g^–1 and excellent cycling stability with a capacity retention of ∼93.8% after 10,000 cycles. The flexible quasi-solid-state asymmetric supercapacitor (ASC) based on Se_0.6@CPNA-ACFT as a positive electrode and FeS₂ decorated reduced graphene oxide at etched CFT (FeS₂@rGO-ECFT) as a negative electrode exhibits a maximum energy density of ∼70.6 Wh kg^–1 (volumetric energy density of ∼1.81 mWh cm^–3) and a maximum power density of 8.163 kW kg^–1 with remarkable stability. This work provides a good example of the rational modification of a 2D Co-MOF into an efficient Se_0.6@CPNA-ACFT electrode material for a high-performance quasi-solid-state flexible ASC for future energy storage applications.

中文翻译：

二维钴金属-有机骨架对磷钴纳米结构阵列的硒渗透控制：柔性拟固态非对称超级电容器的自支撑电极

含过渡金属（TMs）与硒（Se）的各种杂化材料已得到广泛研究，但是在二维钴金属-有机骨架（2D Co-MOF）衍生的磷化钴纳米结构阵列（CPNA）中，Se的受控渗透）是用于储能应用的材料设计的不同方法。在这项工作中，二维Co-MOF阵列成功地在活性炭纤维织物（ACFT）上生长，并在优化的条件下通过连续的磷化和硒渗透过程转化为Se _x @ CPNA-ACFT。在三电极系统中，Se _0.6 @ CPNA-ACFT显示出更高的比容量，约为302 mAh g ^–1优异的循环稳定性，在10,000次循环后的容量保持率约为93.8％。基于Se _0.6 @ CPNA-ACFT的柔性准固态不对称超级电容器（ASC）作为正电极，在蚀刻的CFT上以FeS ₂装饰的还原石墨烯氧化物（FeS ₂ @ rGO-ECFT ）作为负电极表现出最大的能量密度约为70.6 Wh kg ^–1（体积能量密度约为1.81 mWh cm ^–3），最大功率密度为8.163 kW kg ^–1，具有显着的稳定性。这项工作为将二维Co-MOF合理地修改为有效的Se _0.6提供了一个很好的例子。@ CPNA-ACFT电极材料，用于未来的储能应用中的高性能准固态柔性ASC。

更新日期：2021-01-25

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