Charge-Controlled Switchable CO2 Capture on Boron Nitride Nanomaterials

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• 作者：Qiao Sun ; Zhen Li ; Debra J. Searles ; Ying Chen ; Gaoqing (Max) Lu ; Aijun Du
• 刊名：The Journal of the American Chemical Society
• 出版年：2013
• 出版时间：June 5, 2013
• 年：2013
• 卷：135
• 期：22
• 页码：8246-8253
• 全文大小：438K
• 年卷期：v.135,no.22(June 5, 2013)
• ISSN：1520-5126

文摘

Increasing concerns about the atmospheric CO₂ concentration and its impact on the environment are motivating researchers to discover new materials and technologies for efficient CO₂ capture and conversion. Here, we report a study of the adsorption of CO₂, CH₄, and H₂ on boron nitride (BN) nanosheets and nanotubes (NTs) with different charge states. The results show that the process of CO₂ capture/release can be simply controlled by switching on/off the charges carried by BN nanomaterials. CO₂ molecules form weak interactions with uncharged BN nanomaterials and are weakly adsorbed. When extra electrons are introduced to these nanomaterials (i.e., when they are negatively charged), CO₂ molecules become tightly bound and strongly adsorbed. Once the electrons are removed, CO₂ molecules spontaneously desorb from BN absorbents. In addition, these negatively charged BN nanosorbents show high selectivity for separating CO₂ from its mixtures with CH₄ and/or H₂. Our study demonstrates that BN nanomaterials are excellent absorbents for controllable, highly selective, and reversible capture and release of CO_2. In addition, the charge density applied in this study is of the order of 10¹³ cm^鈥? of BN nanomaterials and can be easily realized experimentally.