Ni₂P₂O₇Nanoarrays with Decorated C₃N₄Nanosheets as Efficient Electrode for Supercapacitors

Abstract

Ni2P2O7-based composites grown on conductive substrate can efficiently promote the electrical transport during the electrochemical reactions in supercapacitors. However, Ni2P2O7 nanoarrays are easily peeled off from the substrate upon repeated electrochemical reaction. Herein, Ni2P2O7 nanoarrays grown on Ni foam with surficially decorated C3N4 thin nanosheets are achieved by a hydrothermal and in situ calcination strategy. The decorated C3N4 nanosheet network on the surface fully covers both Ni2P2O7 and Ni foam and efficiently prevents Ni2P2O7 nanoarrays from peeling off during the charge and discharge cycles. The optimized composites exhibit high pseudocapacitance and greatly enhanced cycling stability. The assembled asymmetric supercapacitor shows favorable specific capacitance and stability as energy storage devices. Such a strategy for fabricating C3N4-modified Ni2P2O7 nanoarrays is feasible and efficient, and can be therefore extended for constructing other electrodes with high capacitance and excellent stability.

Nano‐Micro‐Structured Nickel‐Cobalt Hydroxide/Ni2P2O7 Assembly on Nickel Foam: An Outstanding Electrocatalyst for Alkaline Oxygen Evolution Reaction

“…However, the metal‐organic incorporation strategy requires high‐temperature annealing, which is not energy efficient. Moreover, to achieve lower series resistance, numerous active sites are required for electrolyte penetration and for achieving noteworthy stability with good performance; thus, direct growth on the conductive substrate is preferred . Further, deposition of a conducting oxide such as Ni 2 P 2 O 7 in‐between the Ni foam and Ni−Co‐hydroxide can improve the conductivity and active surface area .…”

“…Moreover, to achieve lower series resistance, numerous active sites are required for electrolyte penetration and for achieving noteworthy stability with good performance; thus, direct growth on the conductive substrate is preferred . Further, deposition of a conducting oxide such as Ni 2 P 2 O 7 in‐between the Ni foam and Ni−Co‐hydroxide can improve the conductivity and active surface area . Moreover, as potential substitutes for IrO 2 and RuO 2 , Ni and Co have attracted much interest due to their earth‐abundance, environmental friendliness, low cost, and theoretically high catalytic activity, making them prospectively feasible for commercialization in oxygen evolution electrode technology …”

“…[17,24,25] Further, deposition of a conducting oxide such as Ni 2 P 2 O 7 in-between the Ni foam and NiÀ Co-hydroxide can improve the conductivity and active surface area. [24] Moreover, as potential substitutes for IrO 2 and RuO 2 , Ni and Co have attracted much interest due to their earth-abundance, environmental friendliness, low cost, and theoretically high catalytic activity, making them prospectively feasible for commercialization in oxygen evolution electrode technology. [26][27][28][29] Herein, a simple two-step chemical approach is developed for the preparation of efficient electroactive materials for OER application.…”

Hydrogen Production Improvement on Water Decomposition Through Internal Interfacial Charge Transfer in M3(PO4)2-M2P2O7 Mixed-Phase Catalyst (M = Co, Ni, and Cu)

“…Transmission electron microscopy (TEM) images are shown in Figure 2. In most studies [32,33], TEM images of M 2 P 2 O 7 are expressed in sheet form. We also interpreted them in the same context.…”

Nanofiber NiMoO4/g-C3N4 Composite Electrode Materials for Redox Supercapacitor Applications

“…This study further addressed the potential applications of this strategy in developing 3D rGO aerogel composite for high-performance supercapacitors. Moreover, Zhang et al [28] also developed Ni 2 P 2 O 7 nanoarrays with the incorporation of g-C 3 N 4 to yield efficient electrode materials, which retained 91% of SC efficiency after 1000 cycles.…”