Ultrathin One-Dimensional Ni-MIL-77 Nanobelts for High-Performance Electrocatalytic Urea Evolution

Abstract

During all the electrochemical energy conversion processes, the urea (CO(NH 2 ) 2 ) oxidation reaction (UOR), acting as an anode reaction in the urea electrolyzer, takes only 0.37 V to reach the equilibrium potential. As a result, the urea oxidation reaction can form a more effective hydrogen generation pathway by the coupling cathode water decomposition reaction (HER) in theory. However, limited by the harsh reaction mechanism of six-electron transfer, it is still necessary to develop catalyst materials with excellent performance and low costs to carry out efficient UOR performance. In this work, we obtained ultrathin nickel-based organic framework (MOF) nanobelts using a one-step hydrothermal method. Because of growth restrictions, not all of the six coordination sites of nickel are occupied by carboxyl groups. These metal centers with unbalanced coordination will act as active centers of the catalytic reaction, oxidizing CO(NH 2 ) 2 and promoting the formation of CO 2 and N 2 .

One-Dimensional Ni-MIL-77 Metal–Organic Framework as an Efficient Electrode Nanomaterial for Asymmetric Supercapacitors

“…Due to their good sustainability and environmental friendliness, supercapacitors have emerged as attractive contenders in the field of electrochemical energy storage . Supercapacitors, having several advantages, like high power density (PD), short discharge/charge times, and exceptional cycling capability, are considered efficient renewable energy storage devices compared to other conventional energy storage devices. − Low energy density (ED), however, continues to be an obstacle to the widespread usage of supercapacitors . The performance of supercapacitors is expected to be most significantly enhanced by electrode materials.…”

“…2 Recent advancements in the search for an effective material for its application in supercapacitors led us to focus on nickel-based MOFs with a high surface area and excellent capacitance retention. To date, Ni-MIL-77 nanobelts have been synthesized and used in the field of electrolysis for the determination of glucose in human serum, 28 determination of urea in human body fluids, 29 as a bifunctional oxygen catalyst, 30 for electrocatalytic urea evolution, 10 for high sensitive detection of nitrite, 31 etc. However, the activity of Ni-MIL-77 is still not much explored in supercapacitor applications.…”

Study on Impact Test System of Manipulator Based on Six Axis Force Sensor and Intelligent Controller

“…Ge Yu of the Institute of intelligent machinery, Chinese Academy of Sciences, and others invented an ultrathin six-dimensional force/torque sensor based on cross beam and double E-shaped film, which is used to obtain force sensing information of underwater robot wrist [17][18][19]. In addition, because the cross beam sensor has the advantages of symmetrical structure, high sensitivity, and small-dimensional coupling, more and more scholars improve it in order to obtain a sixdimensional force sensor with better performance [20][21][22].…”

Coordination Polymers as Heterogeneous Catalysts for Water Splitting and CO2 Fixation

“…Interestingly, density functional theory Ultrathin nanobelts, based on nickel MOFs that are prepared by hydrothermal synthesis in one step, are shown by Pang and co-workers to catalyze the oxidation of urea and formation of CO 2 and N 2 . 5 In the relevant electrochemical energy conversion processes, the urea oxidation reaction (UOR) acting as an anode reaction in the urea electrolyzer requires only 0.37 V to reach the equilibrium potential. As a result, in principle, the urea oxidation reaction can form a more effective hydrogen generation pathway by coupling cathode water decomposition reaction (HER) at the cathode.…”

“…Ultrathin nanobelts, based on nickel MOFs that are prepared by hydrothermal synthesis in one step, are shown by Pang and co-workers to catalyze the oxidation of urea and formation of CO 2 and N 2 . In the relevant electrochemical energy conversion processes, the urea oxidation reaction (UOR) acting as an anode reaction in the urea electrolyzer requires only 0.37 V to reach the equilibrium potential.…”