Phosphate Species up to 70% Mass Ratio for Enhanced Pseudocapacitive Properties

Highly proportioned and well ‐dispersed phosphate species with superwettability and strong affinity for OH− in the electrolyte are leveraged to comprehensively enhance the redox reaction kinetics and capacitive contribution of the highly conductive mesoporous Ni ‐doped CoP nanowire matrix. The nanohybrids can deliver an ultrahigh specific capacity of 250 mAh g−1 at the high current density of 50 A g−1. AbstractThe emerging phosphate species on the surface or near ‐surface of electrode materials are versatile and have an intriguing ability for dramatically enhanced electrochemical performance. Unfortunately, the distribution/dispersion of phosphate species still keeps at levels on the exterior not within the interior surface of materials, and the micro‐/n anoscale tuning is commonly rarely concerned and its function remains poorly understood. Herein, for the first time, well‐dispersed phosphate species up to 70% mass ratio implanted within Ni‐doped CoP nanowire matrix are presented via an efficient low‐temperature phosphorization strategy. The resultant nanohybrids possess kinetics‐favorable open frameworks with abundant mesopores and a high degree covalency in the chemical bonds, thus leading to rapid mass transport/charge transfer and enhanced redox reaction kinetics. Remarkably, the phosphate species feature superwettability toward w ater and strong affinity for OH− in the electrolyte, evidenced by the shortened distance and reduced adsorption energy...
Source: Small - Category: Nanotechnology Authors: Tags: Full Paper Source Type: research