Feyie Endale Kebede, Tufa Lemma Teshome, Lee Jaebeom, Tadesse Aschalew, Zereffa Enyew Amare
Department of Applied Chemistry, Adama Science and Technology University, P.O. Box: 1888, Adama 1888, Ethiopia.
Research Institute of Materials Chemistry, Chungnam National University, Daejeon 34134, Republic of Korea.
ACS Omega. 2024 Feb 12;9(8):9452-9462. doi: 10.1021/acsomega.3c09008. eCollection 2024 Feb 27.
Copper tin sulfide, CuSnS (CTS), a ternary transition-metal chalcogenide with unique properties, including superior electrical conductivity, distinct crystal structure, and high theoretical capacity, is a potential candidate for supercapacitor (SC) electrode materials. However, there are few studies reporting the application of CuSnS or its composites as electrode materials for SCs. The reported performance of the CuSnS electrode is insufficient regarding cycle stability, rate capability, and specific capacity; probably resulting from poor electrical conductivity, restacking, and agglomeration of the active material during continued charge-discharge cycles. Such limitations can be overcome by incorporating graphene as a support material and employing a binder-free, facile, electrodeposition technique. This work reports the fabrication of a copper tin sulfide-reduced graphene oxide/nickel foam composite electrode (CTS-rGO/NF) through stepwise, facile electrodeposition of rGO and CTS on a NF substrate. Electrochemical evaluations confirmed the enhanced supercapacitive performance of the CTS-rGO/NF electrode compared to that of CTS/NF. A remarkably improved specific capacitance of 820.83 F g was achieved for the CTS-rGO/NF composite electrode at a current density of 5 mA cm, which is higher than that of CTS/NF (516.67 F g). The CTS-rGO/NF composite electrode also exhibited a high-rate capability of 73.1% for galvanostatic charge-discharge (GCD) current densities, ranging from 5 to 12 mA cm, and improved cycling stability with over a 92% capacitance retention after 1000 continuous GCD cycles; demonstrating its excellent performance as an electrode material for energy storage applications, encompassing SCs. The enhanced performance of the CTS-rGO/NF electrode could be attributed to the synergetic effect of the enhanced conductivity and surface area introduced by the inclusion of rGO in the composite.
硫化铜锡（CuSnS，CTS）是一种具有独特性能的三元过渡金属硫族化物，包括优异的导电性、独特的晶体结构和高理论容量，是超级电容器（SC）电极材料的潜在候选者。然而，很少有研究报道将CuSnS或其复合材料用作SCs的电极材料。据报道，CuSnS电极在循环稳定性、倍率性能和比容量方面的表现不足；这可能是由于在连续充放电循环过程中活性材料的电导率差、重新堆叠和团聚所致。通过引入石墨烯作为支撑材料并采用无粘结剂、简便的电沉积技术，可以克服这些限制。这项工作报告了通过在泡沫镍（NF）基底上逐步、简便地电沉积还原氧化石墨烯（rGO）和CTS来制备硫化铜锡-还原氧化石墨烯/泡沫镍复合电极（CTS-rGO/NF）。电化学评估证实，与CTS/NF相比，CTS-rGO/NF电极的超级电容性能得到了增强。CTS-rGO/NF复合电极在电流密度为5 mA cm时实现了显著提高的比电容820.83 F g，高于CTS/NF（516.67 F g）。CTS-rGO/NF复合电极在恒电流充放电（GCD）电流密度范围为5至12 mA cm时也表现出73.1%的高倍率性能，并在1000次连续GCD循环后具有超过92%的电容保持率，从而提高了循环稳定性；证明了其作为包括SCs在内的储能应用电极材料的优异性能。CTS-rGO/NF电极性能的增强可归因于复合材料中引入rGO所带来的导电性增强和表面积增大的协同效应。
