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Highly efficient and durable core-shell catalyst with dual functions: Tungsten nitride quantum dots encapsulated in ultra-thin graphene
Applied Catalysis B: Environment and Energy ( IF 22.1 ) Pub Date : 2021-09-08 , DOI: 10.1016/j.apcatb.2021.120692
Fan Gao 1 , Qiang Wan 1 , Jie Yuan 1 , Rui Lei 1 , Sen Lin 1 , Ping Liu 1
Affiliation  

An efficient and robust bifunctional catalyst that is comprised of tungsten nitride quantum dots encapsulated in ultrathin graphene (WN@C) is synthesized by in situ nitridation reduced pyrolysis method. The photocatalytic and co-catalytic effects of core-shell WN@C are systematically studied. After combining with typical semiconductor ZnIn2S4, the hydrogen evolution activity of the optimal WN@C/ZnIn2S4 composite exhibits 61 times larger than that of ZnIn2S4 and 12 times than that of WN-QDs@C under the visible light illumination (λ ≥ 400 nm). It can continuously produce hydrogen for 99 h without apparent reduction. The analysis and calculations suggest that the enhanced activity can be attributed to the synergistic effect of the lower overpotential of hydrogen evolution reaction (HER), the reduced apparent activation energy (Ea), the decreased Gibbs free energy of H adsorption (∆G*H) and the inhibited recombination of photocharges. This work opens an avenue of the synthesis on quantum dots core-shell structure with dual functions.



中文翻译:

具有双重功能的高效耐用核壳催化剂:封装在超薄石墨烯中的氮化钨量子点

通过原位氮化还原热解法合成了一种高效且坚固的双功能催化剂,该催化剂由封装在超薄石墨烯(WN@C)中的氮化钨量子点组成。系统地研究了核壳 WN@C 的光催化和共催化作用。与典型半导体ZnIn 2 S 4结合后,最佳WN@C/ZnIn 2 S 4复合材料的析氢活性比ZnIn 2 S 4大61倍在可见光照射下(λ≥400 nm)是WN-QDs@C的12倍。可连续产氢99小时而无明显还原。分析和计算表明,活性增强可归因于析氢反应 (HER) 较低的过电位、表观活化能 ( E a ) 降低、H 吸附吉布斯自由能 (Δ G * H ) 和抑制光电荷的复合。这项工作开辟了合成具有双重功能的量子点核壳结构的途径。

更新日期:2021-09-14
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