The Effect of an External Magnetic Field on the Electrochemical Capacitance of Nanoporous Nickel for Energy Storage

Abstract

This work investigates the effect of a magnetic field on the electrochemical performance of nanoporous nickel (np-Ni). We first compare the electrochemical capacitance of np-Ni electrodes, which were prepared using the chemical dealloying strategy under different magnetic flux densities (B = 0, 500 mT). Our experimental data show that np-Ni500 prepared under an external magnetic field of 500 mT exhibits a much better electrochemical performance, in comparison with that (np-Ni0) prepared without applying a magnetic field. Furthermore, the specific capacitance of the np-Ni0 electrode could be further enhanced when we increase the magnetic flux densities from 0 T to 500 mT, whereas the np-Ni500 electrode exhibits a stable electrochemical performance under different magnetic flux densities (B = 0 mT, 300 mT, 500 mT). This could be attributed to the change in the electrochemical impedance of the np-Ni0 electrode induced by an external magnetic field. Our work thus offers an alternative method to enhance the electrochemical energy storage of materials.

Recent developments, challenges and future prospects of magnetic field effects in supercapacitors

“…Furthermore, the study done by Zhang et al revealed the enhanced electrochemical performance of nanoporous nickel prepared with and without the help of a magnetic eld and the electrochemical study of the electrode under the inuence of the magnetic eld. 127 The nanoporous nickel prepared under a magnetic eld strength of 500 mT showed better electrochemical performance than the nanoporous nickel prepared without the interference of the magnetic eld. The electrode produced under the magnetic eld had a large pore size, large surface area and better morphology, which enhanced the contact between the electrode and electrolyte and improved the insertion/exertion of electrolyte ions into the electrode channels.…”

“…The nanoporous electrode prepared under the influence of a magnetic field did not show much activity under the external magnetic field, which is probably due to the high surface area and large pore size distribution. 127…”

Electrocatalyst design for the conversion of energy molecules: electronic state modulation and mass transport regulation

“…72,73,84,85 Similar results have also been reported for the presence of twins, steps, etc. [86][87][88] Moreover, unlike the more uniform stress distribution in the alloy, the defects exhibit a relatively short-range stress distribution, which facilitates coordination-like fine-tuning of the electronic structure around the active site. 89 Twinning can also generate local strain, which in turn affects the electrocatalytic performances of metal-based materials.…”

Noble Metal-Based Catalysts with Core-Shell Structure for Oxygen Reduction Reaction: Progress and Prospective

“…Moreover, the generated gas after the combustion of fossil fuels has caused serious pollution to the environment, resulting in a large number of natural disasters. Therefore, the development of a new type of sustainable clean energy and efficient utilization system is particularly important to solve the current problems such as environmental pollution and energy shortages [ 10 , 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20 ]. Different from the traditional internal combustion engine, which converts the chemical energy of fuel molecules into mechanical energy via combustion, a fuel cell is a device that converts the chemical energy of fuel molecules directly into electric energy through an electrochemical reaction.…”