Regenerative in situ formed Bi nanoparticles on Bi2O2CO3 nanosheets with Bi-vacancies for efficient and stable photocatalytic CO2 reduction to formate,Energy & Environmental Science

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Regenerative in situ formed Bi nanoparticles on Bi2O2CO3 nanosheets with Bi-vacancies for efficient and stable photocatalytic CO2 reduction to formate
Energy & Environmental Science ( IF 32.4 ) Pub Date : 2024-07-22 , DOI: 10.1039/d4ee02356k
Donglian Wen ₁ , Jie Zhao ₁ , Yang You ₁ , Liang Huang ₁ , Haoheng Zhu ₁ , Chuanghui Zhang ₁ , Donglei Bu ₁ , Shaoming Huang _{1,

2}

Affiliation

Photocatalytic CO₂ reduction to formate suffers from poor productivity, selectivity, stability and recyclability. To conquer these drawbacks, a new facile strategy has been utilized to create regenerative in situ formed Bi⁰ nanoparticles on Bi₂O₂CO₃ nanosheets for photocatalytic CO₂ reduction to formate by taking advantage of the self-photoreduction of Bi³⁺ to Bi⁰. It has been proven that Bi⁰ nanoparticles and Bi vacancies are in situ generated simultaneously and adjacently on Bi₂O₂CO₃ nanosheets under illumination (namely BOC-L) via in situ XPS, PXRD, AC-STEM, and FT-IR. Further mechanistic studies have revealed that the contacted corner between the Bi⁰ nanoparticles and Bi₂O₂CO₃ matrix serves synergistically as the catalytic center for CO₂ conversion to formate, while Bi vacancies boost CO₂ adsorption. As an integral result, high productivity (33.5 mmol g⁻¹ h⁻¹) and selectivity (99%) have been achieved. Notably, Bi₂O₂CO₃ can be easily regenerated from BOC-L via a wet chemical method and keep the initial productivity with little decline after 55 cycles with 5 hours per cycle. Moreover, the chemically stable Bi₂O₂CO₃ ensures the maintained performance of CO₂ conversion to formate even after over two months of storage in ambient conditions. This work provides a universal approach to construct highly efficient and robust photocatalysts towards desired reactions for practical applications.

中文翻译：

在具有双空位的 Bi2O2CO3 纳米片上原位再生形成 Bi 纳米颗粒，可高效稳定地光催化 CO2 还原生成甲酸盐

光催化CO ₂还原为甲酸盐的生产率、选择性、稳定性和可回收性较差。为了克服这些缺点，采用了一种新的简便策略，在Bi ₂ O ₂ CO ₃纳米片上创建可再生的原位形成的 Bi ⁰纳米颗粒，利用 Bi ³⁺的自光还原作用将 CO ₂光催化还原为甲酸。 ⁰ .通过原位XPS、PXRD、AC-STEM和FT-IR证明，Bi ⁰纳米颗粒和Bi空位在光照下（即BOC-L）的Bi ₂ O ₂ CO ₃纳米片上同时且相邻地原位生成。进一步的机理研究表明，Bi ⁰纳米颗粒和Bi ₂ O ₂ CO ₃基质之间的接触角协同作为CO ₂转化为甲酸盐的催化中心，而Bi空位则促进CO ₂吸附。总体而言，实现了高生产率（33.5 mmol g ^-1 h ^-1 ）和选择性（99%）。值得注意的是，Bi ₂ O ₂ CO ₃可以通过湿化学法很容易地从BOC-L中再生，并且在每个周期5小时的55个循环后保持初始生产率几乎没有下降。此外，化学稳定的Bi ₂ O ₂ CO ₃即使在环境条件下储存两个多月后也能确保CO ₂转化为甲酸盐的性能保持不变。这项工作提供了一种通用方法来构建高效且稳定的光催化剂，以实现实际应用中所需的反应。

更新日期：2024-07-22

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