Carbon quantum dots reinforced polypyrrole nanowire via electrostatic self-assembly strategy for high-performance supercapacitors

Modification of PPy‐NW Anode by Carbon Dots for High‐performance Mini‐microbial Fuel Cells

“…For CDs, the strong bands at 3,459 and 1,637 cm −1 are attributed to hydroxyl –OH and carbonyl C=O within –COOH, respectively . The spectrum of CDs/PPy‐NW exhibit 2 characteristic bands at 1,550 and 1,448 cm −1 , which are corresponding to C=C and C–N stretching vibration in the Py ring , . The characteristic bands locate at 1,290 and 1,162 cm −1 owing to =C–N in‐plane vibration , while the C–H in‐plane vibration appears at 1,025 and 849 cm −1 , respectively , .…”

Stable Copper Tin Sulfide Nanoflower Modified Carbon Quantum Dots for Improved Supercapacitors

“…In the TEM and corresponding EDX mapping results (Figure 2(g)), Cu, Sn, and S were homogeneously distributed. Besides, the CQDs were uniformly distributed throughout the nanoflower-like structures, which could considerably improve the electrochemical performance of supercapacitors [22,23]. Figure 3(a), the CV curves of CTSs at a scan rate of 50 mV·s −1 exhibited two pairs of significant redox peaks, demonstrating obvious pseudocapacitive behaviour.…”

Electrochemical Performance of Transition Metal‐Coordinated Polypyrrole: A Mini Review

“…have been applied to modify PPy, improving the conductivity and electrochemical stability 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 of PPy. [31][32][33][34]36,39,40,[72][73][74] Normally, conductive carbon modification using carbon quantum dots and graphene can effectively improve the cycling retention of PPy. Electroactive material modification using ruthenium oxide and cobalt nickel sulfide can improve capacitance and cycling retention of PPy.…”

“…In accordance with the valence bond theory, the lone pair of electron at N atom of Py and the empty orbit of transition metal ion (Fe 2 + , Ru 3 + , Cu 2 + or Co 2 + ) could form the coordinate covalent bond, accordingly forming the coordinated pyrrole monomer of PyÀFe, PyÀRu, PyÀCu or PyÀCo, respectively. The monometallic-coordinated pyrrole monomer and the doping agent (LiClO 4 ) then conduct the electrochemical polymerization reaction to form monometallic- Carbon quantum dots reinforced polypyrrole nanowire//1.0 M KCl [31] 306 F g À1 at 0.5 A g À1 66.8 % at 0.5 to 40 A g À1 85.2 % after 5000 cycles at 5 mAcm À2 Graphene wrapped double-layered polypyrrole/polyaniline nanotubes//1.0 M H 2 SO 4 [32] 542 F g À1 at 1 A g À1 60.5 % at 1 to 10 A g À1 92.1 % after 2000 cycles at 2 Ag À1 Sulfonated graphene/polypyrrole composite//1.0 M KCl [33] 310 F g À1 at 0.3 A g À1 61.3 % at 1 to 5 A g À1 71 % after 1500 cycles at 50 mV s À1 Carbon quantum dots modified polypyrrole loading in titania nanotube//1.0 M H 2 SO 4 [34] 849 F g À1 at 0.5 A g À1 62.8 % at 0.5 to 5 A g-1 89.3 % after 2000 cycles at 20 A g À1 Polypyrrole loading in titanium nitride nanotube//1.0 M H 2 SO 4 [35] 1265 F g À1 at 0.6 A g À1 61.0 % at 0.6 to 4.5 A g À1 72.6 % after 2000 cycles at 15 A g À1 Core-shell heterostructured polypyrrole @ cobalt nickel sulfide// 2.0 M KOH [36] 908.1 F g À1 at 1 A g À1 54.5 % at 1 to 20 A g À1 87.7 % after 2000 cycles at 20 A g À1 Ruthenium oxide/polypyrrole composite//0.1 M H 2 SO 4 [37] 642 F g À1 at 1 mA cm À2 88.6 % at 1 to 3 mA cm À2 87.2 % after 1000 cycles at 1 mAcm À2 Polypyrrole/cobalt molybdate composite//0.5 M Na 2 SO 4 [38] 230 F g À1 at 1 A g À1 null 74.6 % after 1000 cycles at 2 Ag À1 Nickel nanoparticle encapsulated polypyrrole nanofiber//1.0 M H 2 SO 4 [39] 488 F g À1 at 0.25 A g À1 66.0 % at 1 to 5 A g À1 56.0 % after 1000 cycles at 5 Ag À1 Polypyrrole/titanium carbide composite//6 M NaNO 3 [40] 333 F g À 1 at 2 mV s À1 59 % at 2 to 400 mV s À1 92 % after 10000 cycles at 0.1 V s À1 Ferrous coordinated polypyrrole//1.0 M H 2 SO 4 [41] 478 F g À1 at 1 A g À1 45. coordinated PPy (PPyÀFe, PPyÀRu, PPyÀCu, PPyÀCo). Two kinds of monometallic-coordinated pyrrole monomer (PyÀCu and PyÀCo) and doping agent (LiClO 4 ) could conduct electrochemical copolymerization reaction to form bimetallic-coordinated PPy (PPyÀCuCo).…”