Graphene-Modulated PDI/g-C3N4 All-Organic S-Scheme Heterojunction Photocatalysts for Efficient CO2 Reduction under Full-Spectrum Irradiation,The Journal of Physical Chemistry C

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Graphene-Modulated PDI/g-C3N4 All-Organic S-Scheme Heterojunction Photocatalysts for Efficient CO2 Reduction under Full-Spectrum Irradiation
The Journal of Physical Chemistry C ( IF 3.3 ) Pub Date : 2021-10-22 , DOI: 10.1021/acs.jpcc.1c07726
Rui Sun ₁ , Haochun Yin ₂ , Ziqing Zhang ₂ , Yilin Wang ₂ , Teng Liang ₂ , Shengyu Zhang _{1,

3} , Liqiang Jing _{1,

2}

Affiliation

Inspired by natural photosynthesis, exploring high-efficiency S-scheme heterojunction photocatalysts, especially with all-organic ones, for CO₂ reduction is of great significance to tackle energy and environment issues. Herein, the dimension-matched perylene diimide/graphene-g-C₃N₄ (PDI/G-CN) S-scheme nanosheet heterojunctions have been successfully constructed as an efficient full-spectrum responsive photocatalyst for converting CO₂ into CO and CH₄ with 16-time improvement compared with pristine CN nanosheets. On the basis of the steady and transient photoluminescence spectra, electron paramagnetic resonance signals, and kelvin probe measurement analyses, and so on, it is confirmed that the exceptional photoactivity is mainly ascribed to the interfacial modulation with G, by which the efficient S-scheme charge transfer and separation is strengthened and the optimized amount of highly dispersed PDI is increased via the π–π interactions. This work elucidates the potential practicability on all-organic CN-based S-scheme heterojunction photocatalysts for efficient solar-to-energy conversion by CO₂ reduction.

中文翻译：

石墨烯调制的 PDI/g-C3N4 全有机 S 型异质结光催化剂在全光谱照射下有效还原 CO2

受自然光合作用的启发，探索高效的 S 型异质结光催化剂，尤其是全有机光催化剂，用于还原CO ₂对解决能源和环境问题具有重要意义。在此，尺寸匹配的苝二酰亚胺/石墨烯-g- C ₃ N ₄ (PDI/G-CN) S 型纳米片异质结已成功构建为一种高效的全光谱响应光催化剂，用于将 CO ₂转化为 CO 和 CH ₄与原始 CN 纳米片相比提高了 16 倍。基于稳态和瞬态光致发光光谱、电子顺磁共振信号和开尔文探针测量分析等，证实特殊的光活性主要归因于与 G 的界面调制，由此有效的 S-scheme电荷转移和分离得到加强，高度分散的 PDI 的优化量通过 π-π 相互作用增加。这项工作阐明了全有机基于 CN 的 S 型异质结光催化剂通过 CO ₂还原进行高效太阳能到能源转换的潜在实用性。

更新日期：2021-11-04

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