Three‐Dimensional Graphene/Metal Oxide Nanoparticle Hybrids for High‐Performance Capacitive Deionization of Saline Water

Abstract

A novel and general method is proposed to construct three-dimensional graphene/metal oxide nanoparticle hybrids. For the first time, it is demonstrated that this graphene-based composite with open pore structures can be used as the high-performance capacitive deionization (CDI) electrode materials, which outperform currently reported materials. This work will offer a promising way to develop highly effective CDI electrode materials.

Hierarchical ultrathin NiAl layered double hydroxide nanosheet arrays on carbon nanotube paper as advanced hybrid electrode for high performance hybrid capacitors

“…On the other hand, among the carbonaceous materials, graphene nanosheet (GNS) has recently gained a substantial amount of attention owing to its good electrical conductivity, high theoretical specific surface area (SSA; 2630 m 2 g −1 per single layer), and excellent chemical stability and mechanical flexibility [27][28][29]. However, GNS tends to aggregate and restack together due to the van der Waals interaction among graphene layers, resulting in severe decrease of the electrochemically active surface area and the access of electrolyte ions to the surface of graphene sheets.…”

TiO2 nanorod-intercalated reduced graphene oxide as high performance electrode material for membrane capacitive deionization

“…Among the commonly utilized metal oxides, TiO 2 has the advantages of low cost, good chemical inertia, being eco-friendly, and ease of anchoring into the carbon structure; moreover it enhances the adsorption capacity in a CDI system [30][31][32][33]. Recently, a three-dimensional graphene/TiO 2 NP composite was proposed as an electrode for CDI [34]. In that study, the results indicated that the metal oxide NPs can beneficially inhibit the aggregation and demonstrate significant improvement in electrosorption capacity under cell only relatively high potential (1.2 V) [34].…”

Ultrathin platinum nanowires grown on single-layered nickel hydroxide with high hydrogen evolution activity

“…These pioneering works hold the promise that the sluggish kinetics of HER might be circumvented if rational fabrication of the hybrid materials could be accomplished and the synergetic interactions between noble metal and metal hydroxide are exploited. However, unlike many reports on successful deposition of noble metal nanoparticles (NPs) on 2D graphene oxide (GO) sheets [24][25][26][27] , controllable growth of noble metal NPs on the layered metal hydroxide sheets is rarely realized. The difficulty lies in the fact that, with respect to the GO sheets, much fewer surface functional groups (like carboxylic acid and carbonyl) result in the reduced adsorption of noble metal ions onto the metal hydroxide sheets, making it unfavourable for heterogeneous nucleation and growth of noble metal NPs on the surface of the layered metal hydroxides.…”