From Highly Purified Boron Nitride to Boron Nitride‐Based Heterostructures: An Inorganic Precursor‐Based Strategy

Abstract

The current approach used to fabricate hexagonal boron nitrides (h-BN) from boron trioxide and urea always results in contamination of the h-BN product with carbon/oxygen. Thus, discovering a facile way of mass producing high-purity h-BN remains a challenge. Herein, a simple yet highly efficient thermal treatment approach to large-scale fabrication of nanoporous h-BN with high yield, high purity, and high crystallinity is described using NaNH 2 and NaBH 4 as the oxygen-and carbon-free precursors. The unique properties of inorganic metal salts, i.e., high melting point and strong electrostatic interaction with carbon substrates, render this strategy suitable for the production of homogeneous h-BN/mesoporous carbon and h-BN/carbon nanotube heterostructures of high crystallinity, high h-BN dispersity, and with a strong interfacial effect. These unique features make This article is protected by copyright. All rights reserved. 3 them promising candidates for supercapacitor applications, resulting a significantly enhanced specific capacitance. This study provides new insight into the fabrication of high-purity h-BN and h-BN-based heterostructures, thus, expanding their application in the field of energy storage and transformation.

Recent Progress on Two-Dimensional Materials

“…So far, silicene/germanene are mainly synthesized on substrates due to the lack of thermodynamic stability, so an in-depth study remains at a theoretical stage and advanced synthesis strategies are needed. As for EDL capacitive 2D materials like BP, h-BN, and g-C3N4, the reduction of their large electronic bandgap can be realized through a controlled doping process or forming heterostructures with graphene to mitigate the poor conductivity and restacking issues effectively [1275][1276][1277] . In the domain of pseudocapacitor, we will exclude some 2D transition metal oxides such as LDHs as their pseudo-capacitive behavior is generally not intrinsic 1278,1279 .…”

Sinter-Resistant Nanoparticle Catalysts Achieved by 2D Boron Nitride-Based Strong Metal–Support Interactions: A New Twist on an Old Story

“… 44 − 47 (3) h-BN exhibits nanoporous architecture with high surface areas. 48 , 49 However, as a nonredox active support, h-BN-derived SMSI materials cannot be fabricated through the traditional impregnation/high-temperature treatment pathway. Thus, a key to success is rational design of the synthetic methodology.…”

“…For the Pd/h-BN-SMSI material, the bands at 2117 and 2171 cm –1 were attributed to gaseous CO, and the band at 2046 cm –1 was assigned to linearly adsorbed CO. 56 Comparatively, in the DRIFTS result of Pd/h-BN, besides linearly adsorbed CO, additional bands at 1914 and 1955 cm –1 appeared, ascribed to two types of bridged adsorption of CO species on the bare Pd NPs, 56 which completely disappeared for Pd/h-BN-SMSI. The presence of linear CO adsorption for Pd/h-BN-SMSI resulted from the nanoporous architecture of h-BN layer, 49 supplying channels for CO molecules to go through and interact with the inner Pd NPs. However, encapsulation with several layers of h-BN on Pd NPs made the space insufficient for the adsorption of bridged CO species, while in Pd/h-BN, there were no barriers around the rare Pd NPs.…”

“…Notably, for h-BN derived from NaBH 4 and NaNH 2 , only micropores in the range of 1–2 nm existed. 49 The introduction of additional mesopores in Pd/h-BN-SMSI was probably caused by the formation of Pd NPs between the interlayer space of h-BN sheets, leading to irregular stacking mode in local areas. The interaction between h-BN with the most exposed Pd (111) surface was explored via first-principles density functional theory (DFT) calculation (see Figure S3 for details).…”

High‐performance adsorptive desulfurization by ternary hybrid boron carbon nitride aerogel

“…Previous studies have pointed out that engineering the structure of BCN is an effective approach to improve its adsorption performance because a well‐defined structure is beneficial to expose more active sites and the accessibility of active sites to organic pollutants 29 . However, these common methods, templates, 24 hybrid, 30 chemical blowing, 31 and molten salt methods 32 were employed to tailor the structure of BCN generally suffer from some limitations, for instance, the requirement of explosive and hazardous precursors, and sophisticated synthesis techniques 33 . Therefore, it is highly desired to develop a novel and facile synthetic methodology for the fabrication of competitive cost‐ and high‐efficiency BCN adsorbent in the field of adsorptive desulfurization.…”