Kaipannan Subramani, Govindarajan Kaviarasan, Sundaramoorthy Santhoshkumar, Marappan Sathish
Functional Materials Division and Academy of Scientific and Innovative Research (AcSIR), CSIR-Central Electrochemical Research Institute, Karaikudi 630 003, Tamil Nadu, India.
ACS Omega. 2019 Sep 16;4(14):15798-15805. doi: 10.1021/acsomega.9b01337. eCollection 2019 Oct 1.
Electronic waste management is one of the key challenges for the green revolution without affecting the environment. The wide use of printer devices has brought a horde of discarded waste toner, which release ∼6000 tons of processed carbon powder into the atmosphere every year that would essentially pollute the atmosphere. Here, we propose a one-step thermal conversion of waste toner powder into carbon/FeO nanocomposites for energy storage applications. Recovered toner carbon (RTC) and toner carbon calcined at 300 °C (RTC-300) were characterized using various analytical tools. From the FE-SEM analysis, the presence of carbon particles with uniformly decorated FeO nanoparticles was confirmed. RTC-300 carbon was used as an electrode material for supercapacitors, and it exhibited a high specific capacitance of 536 F/g at a current density of 3 A/g, which is almost six times higher than that of the commercial mesoporous graphitized carbon black. RTC-300 showed excellent electrochemical stability of 97% over 5000 cycles at a high current density of 20 A/g. The fabricated symmetric cell using RTC-300 electrode materials in an aqueous electrolyte with a cell voltage of 1.8 V delivered a high energy and high-power density of 42 W h/kg and 14.5 kW/kg, respectively. The fabricated device is stable up to 20,000 cycles at a high current density of 20 A/g with a loss of 23% capacitance.
电子废物管理是绿色革命面临的关键挑战之一，且不影响环境。打印机设备的广泛使用产生了大量废弃的废碳粉，每年有大约6000吨经过处理的碳粉释放到大气中，这将严重污染大气。在此，我们提出将废碳粉一步热转化为用于储能应用的碳/FeO纳米复合材料。使用各种分析工具对回收的碳粉碳（RTC）和在300°C下煅烧的碳粉碳（RTC - 300）进行了表征。通过场发射扫描电子显微镜（FE - SEM）分析，证实了存在均匀装饰有FeO纳米颗粒的碳颗粒。RTC - 300碳用作超级电容器的电极材料，在电流密度为3 A/g时表现出536 F/g的高比电容，几乎是商业介孔石墨化炭黑的六倍。RTC - 300在20 A/g的高电流密度下经过5000次循环显示出97%的优异电化学稳定性。使用RTC - 300电极材料在具有1.8 V电池电压的水性电解质中制造的对称电池分别提供了42 W h/kg和14.5 kW/kg的高能量和高功率密度。所制造的器件在20 A/g的高电流密度下稳定运行高达20000次循环，电容损失为23%。
