Three-Dimensional\nPorous Nickel Frameworks Anchored with Cross-Linked Ni(OH)₂ Nanosheets as a Highly Sensitive Nonenzymatic Glucose Sensor

Abstract

A facile and scalable\nin situ microelectrolysis nanofabrication technique is developed for\npreparing cross-linked Ni­(OH)₂ nanosheets on a novel three-dimensional\nporous nickel template (Ni­(OH)₂@3DPN). For the constructed\ntemplate, the porogen of NaCl particles not only induces a self-limiting\nsurficial hot corrosion to claim the “start engine stop”\nmechanism but also serves as the primary battery electrolyte to greatly\naccelerate the growth of Ni­(OH)₂. As far as we know, the\nmicroelectrolysis nanofabrication is superior to the other reported\nNi­(OH)₂ synthesis methods due to the mild condition (60\n°C, 6 h, NaCl solution, ambient environment) and without any\npost-treatment. The integrated Ni­(OH)₂@3DPN electrode with\na highly suitable microstructure and a porous architecture implies\na potential application in electrochemistry. As a proof-of-concept\ndemonstration, the electrode was employed for nonenzymatic glucose\nsensing, which exhibits an outstanding sensitivity of 2761.6 μA\nmM^–1 cm^–2 ranging from 0.46 to\n2100 μM, a fast response, and a low detection limit. The microelectrolysis\nnanofabrication is a one-step, binder-free, entirely green, and therefore\nit has a distinct advantage to improve clean production and reduce\nenergy consumption.