Nickel/Cobalt Molybdate Hollow Rods Induced by Structure and Defect Engineering as Exceptional Electrode Materials for Hybrid Supercapacitor

Abstract

Oxygen defects and hollow structures positively impact pseudocapacitive properties of diffusion/surface‐controlled processes, a component of critical importance when building high‐performance supercapacitors. Hence, we fabricated hollow nickel/cobalt molybdate rods with O‐defects (D−H−NiMoO4@CoMoO4) through a soft‐template and partial reduction method, enhancing D−H−NiMoO4@CoMoO4’s electrochemical performance, yielding a specific capacitance of 1329 F g−1, and demonstrating excellent durability with 95.8 % capacity retention after 3000 cycles. D−H−NiMoO4@CoMoO4 was used as the positive electrode to construct an asymmetric supercapacitor, displaying an energy density of up to 34.13 Wh kg−1 and demonstrating good predisposition towards practical applications. This work presents an effective approach to fabricate and use hollow nickel/cobalt molybdate rods with O‐defects as pseudocapacitor material for high‐performance capacitive energy storage devices.

High-Entropy Oxides Prepared by Dealloying Method for Supercapacitors

“…70.9/17.0/12.1 is the O L /O V /O C ratio, which indicates that the formation of high-entropy oxides by this method tends to form complete grains. The existence of oxygen vacancies can lead to better adsorption of OH – and become the electroactive center of the redox reaction, , thus improving the electrochemical performance.…”

Heterostructured CoFeP/CoP as an Electrocatalyst for Hydrogen Evolution in Alkaline Media

“…X-ray powder diffraction (XRD) was utilized to explore the interior structure evolution and crystallinity of the as-obtained materials. As seen in Figure 3a, the obvious characteristic peaks at 18.9, 34.1, 39.4, and 56.3°, which can be indexed to the 44,45 The peaks located at 783.16 eV (Co 2p 3/2 ) and 799.18 eV (Co 2p 1/2 ) are indexed to Co + . 46 As displayed in Figure 3c, the Fe 2p peak indicates a spin-obit doublet at 707.2 and 720.6 eV, namely Fe 2p 3/2 and Fe 2p 1/2 states of Fe species in Fe−P, respectively.…”

Approaching high performance Ni(Co) molybdate electrode materials for flexible hybrid devices

“…It is superior to some previous reports (Table 2). 33–38 EIS was further used to investigate the electrochemical performance of electrode materials in the frequency range from 100 kHz to 0.01 Hz. The corresponding Nyquist plots are shown in Fig.…”