Anil Kumar Yedluri, Yadav Anuja A, Al-Asbahi Bandar Ali, Kang Seok-Won, Moniruzzaman Md
Department of Physics, United Arab Emirates University, Al Ain 15551, United Arab Emirates.
Department of Automotive Engineering, Yeungnam University, 280 Daehak-ro, Gyeongsan 38541, Gyeongbuk-do, Korea.
Molecules. 2022 Nov 2;27(21):7458. doi: 10.3390/molecules27217458.
Transition-metal sulfides exaggerate higher theoretical capacities and were considered a type of prospective nanomaterials for energy storage; their inherent weaker conductivities and lower electrochemical active sites limited the commercial applications of the electrodes. The sheet-like nickel cobalt sulfide nanoparticles with richer sulfur vacancies were fabricated by a two-step hydrothermal technique. The sheet-like nanoparticles self-combination by ultrathin nanoparticles brought active electrodes entirely contacted with the electrolytes, benefiting ion diffusion and charges/discharges. Nevertheless, defect engineers of sulfur vacancy at the atomic level raise the intrinsic conductivities and improve the active sites for energy storage functions. As a result, the gained sulfur-deficient NiCoS nanosheets consist of good specific capacitances of 971 F g at 2 A g and an excellent cycle span, retaining 88.7% of the initial capacitance over 3500 cyclings. Moreover, the values of capacitance results exhibited that the fulfilling characteristic of the sample was a combination of the hydrothermal procedure and the surface capacitances behavior. This novel investigation proposes a new perspective to importantly improve the electrochemical performances of the electrode by the absolute engineering of defects and morphologies in the supercapacitor field.
过渡金属硫化物具有更高的理论容量，被认为是一类有前景的储能纳米材料；但其固有的较弱导电性和较低的电化学活性位点限制了电极的商业应用。采用两步水热法制备了具有更丰富硫空位的片状镍钴硫化物纳米颗粒。片状纳米颗粒通过超薄纳米颗粒自组合，使活性电极与电解质完全接触，有利于离子扩散和充放电。然而，原子水平上硫空位的缺陷工程提高了本征电导率，并改善了储能功能的活性位点。结果，所制备的缺硫NiCoS纳米片在2 A g时具有971 F g的良好比电容和出色的循环寿命，在3500次循环后仍保留初始电容的88.7%。此外，电容结果表明，样品的性能是水热过程和表面电容行为的结合。这项新研究提出了一个新的视角，通过超级电容器领域中缺陷和形貌的精确工程，重要地提高电极的电化学性能。
