Enhanced photoreduction CO2 activity on g-C3N4: By synergistic effect of nitrogen defective-enriched and porous structure, and mechanism insights
Enhanced photoreduction CO2 activity on g-C3N4: By synergistic effect of nitrogen defective-enriched and porous structure, and mechanism insights
复制标题
增强g-C3N4上的光还原CO2活性：通过氮缺陷富集和多孔结构的协同作用以及机制见解
DOI：
10.1016/j.cej.2020.124288
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发表时间：
2020-05-15
影响因子：
15.1
通讯作者：
Li, Songtian
中科院分区：
文献类型：
--
作者：
Ma, Wei;Wang, Na;Li, Songtian
采用原位掺杂和冷冻干燥法制备了一种新型的含氮缺陷的多孔结构g-C3N4光催化剂(DCN-P)，该催化剂具有较好的光还原性能，CO、CH4产率分别为19.7umol g(-1)、37.1 umol g(-1)，高于体相g-C3N4(B-CN)。实验和密度泛函理论(DFT)计算结果表明，独特的孔结构和DCN-P中的氮缺陷的协同作用可以增强g-C3N4对CO2的吸附，增加反应中心，改善光吸收，缩小禁带宽度，这一结果得到了实验和密度泛函理论计算的支持。更重要的是，这项工作为构建其他高性能的无金属光催化体系还原二氧化碳提供了新的思路。
A novel porous structure g-C3N4 with nitrogen defect photocatalysts (DCN-P) was successfully prepared by insitu doping strategy and freeze-dried method, it exhibits enhanced photo-reduction CO2 performance with satisfactory CO, CH4 productivity about 19.7 umol g(-1), 37.1 umol g(-1), which is more higher than that of bulk g-C3N4 (B-CN). Systematically characterization demonstrated that the synergistic effect of unique porous structure and the nitrogen defection in DCN-P can effect enhance CO2 adsorption, increase reactive sites, improve optical absorption and narrowed band gap of g-C3N4, which is supported by both experimental and density functional theory (DFT) calculations results. More importantly, this work provides a new ideas for constructing other highperformance metal-free photocatalytic systems for CO2 reduction.