A graphdiyne oxide composite membrane for active electrolyte enhanced supercapacitors with super long self-discharge time

Abstract

Activate electrolyte enhanced supercapacitors (AEESCs) are considered as promising tools for power capacity due to their high specific capacitance and simple creation form. However, there are many challenges, such as...

Graphynes and Graphdiynes for Energy Storage and Catalytic Utilization: Theoretical Insights into Recent Advances

“…246 Moreover, a GDYO/poly(vinyl alcohol) (PVA) composite membrane at the liquid/air interface was used to construct the active electrolyte-enhanced supercapacitors (AEESCs), showing ultrahigh self-discharge time (37160 s, 1.0−0.3 V) and excellent capacity retention of 95.1% after 8000 cycles. 247 To sum up, γ-GY and GDY have been successfully utilized to construct supercapacitors exhibiting excellent capacitance and cyclic stability due to the high specific surface area and carrier mobility of γ-GY and GDY. However, the band gap of pristine GYs and GDYs limits their performance to a certain extent, so that GYs and GDYs structures need to be functionalized or combined with other materials to exhibit better performance in supercapacitors.…”

“…In addition, a GDY oxide/MnO 2 (GDYO/MnO 2 ) hybrid nanostructure (Figure b) showed better supercapacitor performance than the GDY/MnO 2 composite with specific capacities, of 301 and 170 F g –1 at a discharge current densities of 0.2 and 10 A g –1 , respectively . Moreover, a GDYO/poly­(vinyl alcohol) (PVA) composite membrane at the liquid/air interface was used to construct the active electrolyte-enhanced supercapacitors (AEESCs), showing ultrahigh self-discharge time (37160 s, 1.0–0.3 V) and excellent capacity retention of 95.1% after 8000 cycles . To sum up, γ-GY and GDY have been successfully utilized to construct supercapacitors exhibiting excellent capacitance and cyclic stability due to the high specific surface area and carrier mobility of γ-GY and GDY.…”

MXene-based separators for redox-enhanced electric capacitors with a suppressed shuttle effect and self-discharge: the effect of MXene ageing

“…17,18 Therefore, the development of effective strategies to suppress the shuttling of I À /I 3 À ions in redox ECs and batteries with iodide-based electrolytes has drawn much research attention. [19][20][21][22] MXenes, a family of two-dimensional (2D) transition metal carbides or nitrides, were first discovered by Naguib in 2011. The chemical formula of an MXene can be described as M n+1 X n T x (M = early transition metal; X = C or N; T = -OH, -O, or -F; n = 1, 2, or 3).…”

“…17,18 Therefore, the development of effective strategies to suppress the shuttling of I − /I 3 − ions in redox ECs and batteries with iodide-based electrolytes has drawn much research attention. 19–22…”

A Conjugately Configured Supercapacitor with Suppressed Self-Discharge by Coupling Pairs of Presodiated Manganese Oxides

“…Currently, the mechanisms proposed for self-discharge include ohmic leakage, charge redistribution, and Faradaic reactions. ,,− Ohmic leakage refers to the loss due to incomplete isolation between positive and negative electrodes. ,, Charge redistribution refers to the loss caused by the transfer of absorbed charged ions due to the concentration gradient. , The Faradaic reaction is caused by the irreversible reaction between the electrodes and the impurities in the electrolytes. ,− So far, the research on the inhibition of self-discharge has mainly focused on improving the electrochemical stability of one component of the device such as the modification of the electrode surface, ,, electrode coating, , the improvement of the electrolyte, − or designing functional separators. − Theoretically, the self-discharge process of one electrode is accompanied with the desorption of ions and the dissipation of electrons, which is coupled with the electrochemical behavior of the counter electrode. − This indicates that the configuration of the device might have a decisive effect on the self-discharge behavior. , However, as far as we know, the viability to suppress self-discharge based on designing the configuration of the device remains unknown.…”