Ultrathin Cu2P2O7 nanoflakes on stainless steel substrate for flexible symmetric all-solid-state supercapacitors

Multi‐walled carbon nanotubes supported copper phosphate microflowers for flexible solid‐state supercapacitor

“…Even at higher current density, the device still retains 10.9 Wh kg −1 of specific energy with a maximum specific power of 6.5 kW kg −1 . Ragone plot correlating the energy and power densities of the present device with previously reported phosphates devices is shown in Figure 10E, Clearly, the obtained energy density of 25.4 Wh kg −1 for as‐fabricated CuCNT device is considerably superior to earlier reported values for most of the phosphates based symmetric and asymmetric systems (see Table 1), including Mn 3 (PO 4 ) 2 //Mn 3 (PO 4 ) 2 (11.7 Wh kg −1 ), 14 Mn 3 (PO 4 ) 2 /PANI//AC (14.7 Wh kg −1 ), 15 Mn 3 (PO 4 ) 2 /GF//AC (7.6 Wh kg −1 ), 16 Cu 2 P 2 O 7 //Cu 2 P 2 O 7 (11.54 Wh kg −1 ), 42 Ni/NiHPO 4 //AC (26.8 Wh kg −1 ), 71 C‐Fe 2 P 4 O 12 //C‐Fe 2 P 4 O 12 (6.2 Wh kg −1 ), 72 MnPO 4 ∙H 2 O/GO//MnPO 4 ∙H 2 O/GO (5.78 Wh kg −1 ), 73 Na‐doped Ni 2 P 2 O 7 //Graphene (23.4 Wh kg −1 ), 74 TiP 2 O 7 //AC (13 Wh kg −1 ), 75 Mn 3 (PO 4 ) 2 //AC (16.64 Wh kg −1 ), 76 Mn 3 (PO 4 ) 2 //Mn 3 (PO 4 ) 2 (19.09 Wh kg −1 ), 76 Co 3 (PO 4 ) 2 ∙4H 2 O/GF//C‐Fe/PANI (24 Wh kg −1 ), 77 VOPO 4 ∙2H 2 O//VOPO 4 ∙2H 2 O (18.7 Wh kg −1 ) 78 . This fine supremacy of the device to store favorable amount of energy density even at high power operation can be attributed to the complementary constituents of composite electrode in addition to antique microstructural nanoflakes phosphate assembly.…”

“…Then, using an efficient controlled ion‐by‐ion deposition technique, SILAR, a thin film of nanostructured Cu 2 P 2 O 7 was coated onto MWCNT via two equimolar (0.1 M) aqueous precursors of cationic Cu(NO 3 ) 3 and anionic KH 2 PO 4. 42 Based on the adsorption of Cu 2+ cations on MWCNT followed by reaction with PO 4 3− anions, a light blue‐colored thin film of copper phosphate was formed after 60 cycles with immersions of 20 seconds in each precursor. The active mass loading of the CuCNT thin film was found to be 1.8 mg cm −2 , estimated by the gravimetric weight difference method using a sensitive microbalance.…”

“…In particular, successive ionic layer and adsorption reaction (SILAR) has been demonstrated to be a superlative approach to avoid homogeneous precipitation for material synthesis in thin‐film forms owing to its environmental benignity, simplicity, and cost‐effectiveness 36‐41 . As a pioneering work, our group very recently proposed a facile SILAR strategy to grow Cu 2 P 2 O 7 nanoflakes as binder‐free supercapacitor electrode 42 . Although it has shown improved storage performance, poor cyclic stability still hinders its commercial applicability.…”

“…[36][37][38][39][40][41] As a pioneering work, our group very recently proposed a facile SILAR strategy to grow Cu 2 P 2 O 7 nanoflakes as binder-free supercapacitor electrode. 42 Although it has shown improved storage performance, poor cyclic stability still hinders its commercial applicability. Henceforth, it motivated us to extend this work through the integration of redox-rich Cu 2 P 2 O 7 with robust MWCNT to develop Cu 2 P 2 O 7 /MWCNT (CuCNT) nano-hybrid that is more mechanically inert and can deliver exhilarated performance.…”

Recent advances in solid‐state supercapacitors: From emerging materials to advanced applications

“…A simple, inexpensive, and binder-free successive ionic layer adsorption and reaction (SILAR) method has been recently emerged to produce thin films. 297,[356][357][358][359][360][361] As discussed above, Gogotsi's group developed a low-cost and rapid stamping process a few years ago to fabricate SMSCs. 228,237 Hu et al developed the "dipping and drying" method to produce freestanding rGO foam with a well-ordered porous structure.…”