Yazar "He, Guanjie" seçeneğine göre listele

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  • Küçük Resim
    Öğe
    Interfacial engineering of reduced graphene oxide for high-performance supercapacitor materials
    (Elsevier B.V., 2020) Hao, Huilian; Wang, Jianjun; Lv, Qiu; Jiao, Yiding; Li, Jing; Akpınar, Işıl; Shen, WenZhong; He, Guanjie
    To solve the problems related to the re-stacking of reduced graphene oxides (rGO) and further improve their surface chemical behaviors to satisfy supercapacitor demands. The rGO decorated with graphene quantum dots has been successfully prepared via a facile low-power ultrasonic method. It is demonstrated the graphene quantum dots/reduced graphene oxide electrode has a high specific capacitance of 312 F g?1, which is nearly three times higher than that of the reduced graphene oxide (132 F g?1). The enhanced super-capacitive performances of graphene quantum dots/reduced graphene oxide have been attributed to the introduction of graphene quantum dots, which effectively prevent the aggregation and restacking of reduced graphene oxide sheets, promoting its surface exposed to the electrolyte for sufficient mass transfer. Meanwhile, these features provide more pathways for the transportation of electrons between the interlayer of reduced graphene oxide sheets. Afterward, a detailed energy storage mechanism was analyzed.
  • Küçük Resim
    Öğe
    Realizing optimal hydrogen evolution reaction properties via tuning phosphorous and transition metal interactions
    (KeAi Publishing Communications Ltd., 2020) Jiang, Haishun; Zhao, Siyu; Li, Wenyao; Neville, Tobias P.; Akpınar, Işıl; Shearing, Paul Robert; Brett, Dan J.L.; He, Guanjie
    Hydrogen is one of the most attractive renewables for future energy application, therefore it is vital to develop cost-effective and highly-efficient electrocatalysts for the hydrogen evolution reaction (HER) to promote the generation of hydrogen from mild methods. In this work, Co–Mo phosphide nanosheets with the adjustable ratio of Co and Mo were fabricated on carbon cloth by a facile hydrothermal-annealing method. Owing to the unique nanostructures, abundant active surfaces and small resistance were achieved. Excellent electrocatalytic performances are obtained, such as the small overpotential of ?67.3 mV to realize a current density of 10 mA cm?2 and a Tafel slope of 69.9 mV dec?1. Rapid recovery of the current response under multistep chronoamperometry is realized and excellent stability retained after the CV test for 2000 cycles. The change of electronic states of different elements was carefully studied which suggested the optimal electrochemical performance can be realized by tuning phosphorous and metal interactions.