Abstract:
The synthesis of cobalt nanocrystal-graphene quantum dot-Ti3C2TX monolithic film electrode (Co-GQD-Ti3C2TX) is reported via self-assembly of Ti3C2TX nanosheets induced by protonated arginine-functionalized graphene quantum dot and subsequent reduction of cobalt (III). The resulting Co-GQD-Ti3C2TX shows good monolithic architecture, mechanical property, dispersibility and conductivity. The structure achieves excellent supercapacitor and sensing behavior. The self-charging supercapacitor produced by printing viscous Co-GQD-Ti3C2TX hydrogel on the back of flexible solar cell surface provides high specific capacitance (296 F g-1 at 1 A g-1), high-rate capacity (153 F g-1 at 20 A g-1), capacity retention (98.1% over 10,000-cycle) and energy density (29.6 W h kg-1 at 299.9 W kg-1). The electrochemical chip produced by printing Co-GQD-Ti3C2TX hydrogel on paper exhibits sensitive electrochemical response towards uric acid. The increase of uric acid between 0.01 and 800 μM causes a linear increase in differential pulse voltammetry signal with a detection limit of 0.0032 μM. The self-powered sensing platform integrating self-charging supercapacitor, electrochemical chip and micro electrochemical workstation was contentedly applied to monitoring uric acid in sweats and shows one broad application prospect in wearable electronic health monitoring device.
摘要:
报道了通过质子化的精氨酸功能化的石墨烯量子点诱导的Ti3C2TX纳米片的自组装以及随后的钴(III)还原,合成了钴纳米晶体-石墨烯量子点-Ti3C2TX单片膜电极(Co-GQD-Ti3C2TX)。所得的Co-GQD-Ti3C2TX显示出良好的单片结构,机械性能,分散性和导电性。该结构实现了优异的超级电容器和感测行为。通过在柔性太阳能电池表面的背面印刷粘性Co-GQD-Ti3C2TX水凝胶而产生的自充电超级电容器提供了高比电容(在1Ag-1时为296Fg-1),高速率容量(153Fg-1,20Ag-1),容量保持率(在10,000次循环中为98.1%)和能量密度(299.9Wkg-1时为29.6Whkg-1)。通过在纸上印刷Co-GQD-Ti3C2TX水凝胶生产的电化学芯片对尿酸表现出灵敏的电化学响应。尿酸在0.01至800μM之间的增加导致差分脉冲伏安信号的线性增加,检测限为0.0032μM。集成自充电超级电容器的自供电传感平台,电化学芯片和微型电化学工作站满足于汗液中尿酸的监测,在可穿戴式电子健康监测设备中显示出广阔的应用前景。