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2D/2D Mo2CTx/g-C3N4 with a strong coupling interface via one-step NH4Cl-assisted calcination for enhanced photocatalytic hydrogen production
Catalysis Science & Technology ( IF 4.4 ) Pub Date : 2024-08-12 , DOI: 10.1039/d4cy00882k Haiting Zou , Miaomiao Pan , Ping Wang , Xuefei Wang , Feng Chen , Huogen Yu
Catalysis Science & Technology ( IF 4.4 ) Pub Date : 2024-08-12 , DOI: 10.1039/d4cy00882k Haiting Zou , Miaomiao Pan , Ping Wang , Xuefei Wang , Feng Chen , Huogen Yu
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Mo2CTx is regarded as a potential cocatalyst to substitute noble metals in photocatalytic hydrogen production owing to its good electrical conductivity and a large number of active sites. However, Mo2CTx-based photocatalysts by the conventional physical mixing method always display a weak coupling interface between Mo2CTx and photocatalysts due to the large block-layered structure of Mo2CTx, which results in slow photogenerated-electron transfer of photocatalysts, thereby leading to unsatisfactory hydrogen production efficiency. Considering that in situ construction and the 2D/2D structure can increase the contact area and enhance the coupling interface interaction, in this study, a strategy of constructing a 2D/2D Mo2CTx/g-C3N4 photocatalyst from pre-etched Mo2CTx and guanidine hydrochloride (CH6ClN3) through a one-step NH4Cl-assisted calcination method is realized by the gas-expansion exfoliation of Mo2CTx and in situ generation of thin g-C3N4 nanosheets. Experimental results unveiled that the 2D/2D Mo2CTx/g-C3N4 composite photocatalyst exhibits an exceptional H2-evolution activity (125 μmol h−1 g−1, AQE = 3.88%), which is almost 25 and 18 times greater than that of pure g-C3N4 and physically mixed Mo2CTx–g-C3N4, respectively. The enhanced photocatalytic H2-production efficiency is attributed to the robust coupling interface between Mo2CTx and g-C3N4 in 2D/2D Mo2CTx/g-C3N4, which promotes the fast photogenerated electron transfer from g-C3N4 to Mo2CTx and achieves an optimized Gibbs free energy. This study offers a novel perspective on preparing high-efficiency 2D/2D MXene-based photocatalysts.
中文翻译:
2D/2D Mo2CTx/g-C3N4 具有强耦合界面,通过一步 NH4Cl 辅助煅烧增强光催化产氢
Mo 2 CT x因其良好的导电性和大量的活性位点而被认为是光催化制氢中替代贵金属的潜在助催化剂。然而,由于Mo 2 CT x的大块层结构,传统物理混合方法制备的Mo 2 CT x基光催化剂在Mo 2 CT x和光催化剂之间总是表现出弱耦合界面,导致光生电子转移缓慢。光催化剂的影响,从而导致产氢效率不理想。 考虑到原位构建和2D/2D结构可以增加接触面积并增强耦合界面相互作用,在本研究中,采用预蚀刻Mo构建2D/2D Mo 2 CT x /gC 3 N 4光催化剂的策略2 CT x和盐酸胍(CH 6 ClN 3 )通过一步NH 4 Cl辅助煅烧方法通过Mo 2 CT x的气体膨胀剥离和原位生成薄gC 3 N 4纳米片实现。实验结果表明,2D/2D Mo 2 CT x /gC 3 N 4复合光催化剂表现出优异的H 2析出活性(125 μmol h −1 g −1 ,AQE = 3.88%),分别比纯 gC 3 N 4和物理混合的 Mo 2 CT x –gC 3 N 4提高了近 25 倍和 18 倍。光催化H 2生产效率的提高归因于2D/2D Mo 2 CT x /gC 3 N 4中Mo 2 CT x和gC 3 N 4之间强大的耦合界面,这促进了gC 3 N的快速光生电子转移4转化为 Mo 2 CT x并实现优化的吉布斯自由能。这项研究为制备高效 2D/2D MXene 基光催化剂提供了新的视角。
更新日期:2024-08-12
中文翻译:
![](https://scdn.x-mol.com/jcss/images/paperTranslation.png)
2D/2D Mo2CTx/g-C3N4 具有强耦合界面,通过一步 NH4Cl 辅助煅烧增强光催化产氢
Mo 2 CT x因其良好的导电性和大量的活性位点而被认为是光催化制氢中替代贵金属的潜在助催化剂。然而,由于Mo 2 CT x的大块层结构,传统物理混合方法制备的Mo 2 CT x基光催化剂在Mo 2 CT x和光催化剂之间总是表现出弱耦合界面,导致光生电子转移缓慢。光催化剂的影响,从而导致产氢效率不理想。 考虑到原位构建和2D/2D结构可以增加接触面积并增强耦合界面相互作用,在本研究中,采用预蚀刻Mo构建2D/2D Mo 2 CT x /gC 3 N 4光催化剂的策略2 CT x和盐酸胍(CH 6 ClN 3 )通过一步NH 4 Cl辅助煅烧方法通过Mo 2 CT x的气体膨胀剥离和原位生成薄gC 3 N 4纳米片实现。实验结果表明,2D/2D Mo 2 CT x /gC 3 N 4复合光催化剂表现出优异的H 2析出活性(125 μmol h −1 g −1 ,AQE = 3.88%),分别比纯 gC 3 N 4和物理混合的 Mo 2 CT x –gC 3 N 4提高了近 25 倍和 18 倍。光催化H 2生产效率的提高归因于2D/2D Mo 2 CT x /gC 3 N 4中Mo 2 CT x和gC 3 N 4之间强大的耦合界面,这促进了gC 3 N的快速光生电子转移4转化为 Mo 2 CT x并实现优化的吉布斯自由能。这项研究为制备高效 2D/2D MXene 基光催化剂提供了新的视角。