Sains Malaysiana 48(2)(2019): 407–417

http://dx.doi.org/10.17576/jsm-2019-4802-19

Elektrod Superkapasitor daripada Komposit Karbon Teraktif dan Grafen dengan Perekat PVDF-HFP

(Supercapacitor Electrode from Activated Carbon and Graphene Composite with PVDF-HFP Binder)

MOHAMAD REDWANI MOHD JASNI, MOHAMAD DERAMAN, ZALITA ZAINUDDIN*, CHIA CHIN HUA & RAMLI OMAR

School of Applied Physics, Faculty of Science and Technology, Universiti Kebangsaan Malaysia, 43600 UKM Bangi, Selangor Darul Ehsan, Malaysia

Diserahkan: 14 Julai 2018/Diterima: 10 Oktober 2018

ABSTRAK

Elektrod superkapasitor elektrokimia dwi-lapisan telah dihasilkan menggunakan serbuk karbon monolit teraktif (KMT) sebagai bahan pemula dan grafen sebagai bahan tambah. Elektrod telah disediakan dengan mencampurkan serbuk KMT dan grafen dengan peratus berat yang berbeza (0, 5, 10, 20 dan 40 % bt.) yang ditambah larutan poli-vinilidene fluorida-heksaafluoroprofilen (PVDF-HFP) sebagai agen perekat serta karbon hitam sebagai agen konduksian. Pencirian fizikal dijalankan ke atas elektrod dengan menggunakan kaedah pembelauan sinar-X (XRD) dan isoterma jerapan-nyahjerapan. Prestasi sel superkapasitor dengan elektrolit akueus 6 M KOH telah diuji menggunakan kaedah spektroskopi impedans elektrokimia (EIS), voltametri berkitar (CV) dan cas-discas galvanostatik (GCD). Sel superkapasitor dengan bahan tambah grafen 5 % bt. (KMT05) didapati mempunyai kapasitans tentu yang tertinggi (172 F g-1), tenaga tentu yang tertinggi (11 Wh kg-1), kuasa tentu yang tertinggi (196.13 W kg-1), masa gerak balas terendah (2 s) serta rintangan pemindahan cas terendah (2.4 Ω) berbanding sel-sel yang lain. Ini menunjukkan bahawa bahan tambah grafen 5 % bt. adalah optimum untuk meningkatkan prestasi sel. Hasil ini selaras dengan saiz mikrohablur serta luas permukaan khusus KMT05X yang lebih besar berbanding KMT tanpa bahan tambah grafen (KMT00X).

Kata kunci: Elektrolit akues; elektrod perekat; grafen; karbon monolit teraktif; serbuk karbon swa-merekat

ABSTRACT

Electrochemical double-layer supercapacitor electrodes were produced using an activated carbon monolith (ACM) powder as the precursor and graphene as the additive. Electrodes were prepared by mixing ACM powder and graphene with different weight percentage (0, 5, 10, 20 and 40 wt. %) which were added with poly-vinylidene fluoride-hexafluoropropylene (PVDF-HFP) solution as a binding agent and carbon black as a conductive agent. Physical characterization was carried out on the electrodes by using an X-ray diffraction (XRD) and adsorption-desorption isotherms methods. Supercapacitor cells performance using 6 M KOH aqueous electrolyte were tested using electrochemical impedance spectroscopy (EIS), cyclic voltammetry (CV) and galvanostatic charge discharges (GCD) methods. Supercapacitor cell with 5 wt. % graphene additive (KMT05) was found to have the highest specific capacitance (172 F g-1), highest specific energy (11 Wh kg-1), highest specific power (196.13 W kg-1), lowest response time (2 s), and lowest charge transfer resistance (2.4 Ω) compared to other cells. This showed that 5 wt. % graphene additive is optimum for improving the cell performance. These results are compatible with the larger microcrystallites size and specific surface area of KMT05X have a larger compared to the KMT with no graphene additive (KMT00X).

Keywords: Activated carbon monoliths; aqueous electrolyte;graphene; paste electrode; self-adhesive carbon grains

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*Pengarang untuk surat-menyurat; email: zazai@ukm.edu.my