Synthesis of New Intergrowth and Nanostructured Metal Oxyhalide Photocatalysts

新型共生纳米结构金属卤氧化物光催化剂的合成

• 批准号: 2113536
• 负责人: Sara Skrabalak
• 金额: $ 51.51万
• 依托单位: Indiana University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2021
• 资助国家: 美国
• 起止时间: 2021-08-01 至 2025-07-31
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2113536&HistoricalAwards=false
• 关键词: Synthesis; New; Intergrowth; Nanostructured; Metal

Nontechnical summaryThere is a critical need for materials that absorb visible light so that such energy can be used to drive reactions at their surfaces, such a solar water splitting which promises to provide hydrogen as a clean fuel. Metal oxyhalides are an exciting class of such photocatalytic materials but often they will be converted to their corresponding metal oxide upon use, making them ineffective long-term. Recently, a subset of bismuth-containing metal oxyhalides was identified to be both visible light absorbing as well as durable during their use as photocatalysts. With this project, supported by the Solid State and Materials Chemistry program in the Division of Materials Research, Professor Sara Skrabalak and her research group at Indiana University will develop new materials that combine different bismuth-containing metal oxyhalides for uses in solar water splitting. The atomic level structure of these new materials are also characterized in detail to understand how their structure provides both visible light absorption and critical durability. These materials are also being synthesized as crystals with defined shapes so that the best crystal faces are expressed to facilitate the water splitting reaction. This work provides fundamental insight into the properties of materials, with potential to address material durability challenges associated with harnessing solar energy. The research is paired with broad educational and outreach activities that foster understanding about material science and solar energy to the general public.Technical summaryThis project, supported by the Solid State and Materials Chemistry program in the Division of Materials Research, will develop synthetic methods for the growth of new metal oxyhalide intergrowths of the form Bi4MO8X-Bi2LnO4X. The fundamental hypothesis of this work involves the idea that intergrowth formation and modulation of their stoichiometry enables engineering of their electronic structure and internal electric fields toward enhanced photocatalytic efficiency and photostability compared to the parent compounds. This synthetic work is coupled with detailed structural characterization by high resolution electron microscopy and X-ray total scattering experiments so that robust structure-property correlations are established. A final aim focuses on the synthesis of shape-controlled Bi4MO8X nanocrystals and the study of their faceting on photocatalytic performance. Collectively, this research advances the synthesis and design of durable metal oxyhalides by elucidating the roles of local and nanoscale structure on the optoelectronic properties and photocatalytic performance of these promising heteroanionic materials. The project will also support educational and outreach activities that introduce energy concepts to non-scientists through partnerships with Wonderlab (a children’s science museum in Bloomington, Indiana) and Indiana University’s ScienceFest.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

非技术摘要迫切需要吸收可见光的材料，以便利用这种能量来驱动其表面的反应，例如太阳能水分解，有望提供氢气作为清洁燃料。金属卤氧化物是一类令人兴奋的光催化材料，但它们在使用时通常会转化为相应的金属氧化物，使其长期无效。最近，含铋金属卤氧化物的一个子集被认为在用作光催化剂时既具有可见光吸收性又具有耐用性。通过这个项目，在材料研究部固态和材料化学项目的支持下，印第安纳大学萨拉·斯克拉巴拉克教授和她的研究小组将开发结合不同含铋金属卤氧化物的新材料，用于太阳能水分解。这些新材料的原子级结构也被详细表征，以了解它们的结构如何提供可见光吸收和临界耐久性。这些材料也被合成为具有特定形状的晶体，以便表现出最佳的晶面以促进水分解反应。这项工作提供了对材料特性的基本见解，有可能解决与利用太阳能相关的材料耐久性挑战。该研究与广泛的教育和外展活动相结合，促进公众对材料科学和太阳能的了解。技术摘要该项目得到材料研究部固态和材料化学项目的支持，将开发用于生长 Bi4MO8X-Bi2LnO4X 形式的新型金属卤氧化物共生体的合成方法。 这项工作的基本假设涉及这样的想法：共生形成和化学计量的调节使得能够对其电子结构和内部电场进行工程改造，从而与母体化合物相比提高光催化效率和光稳定性。这项合成工作与高分辨率电子显微镜和 X 射线全散射实验的详细结构表征相结合，从而建立了稳健的结构-性能相关性。最终目标集中于形状控制的 Bi4MO8X 纳米晶体的合成及其光催化性能的研究。总的来说，这项研究通过阐明局部和纳米级结构对这些有前景的杂阴离子材料的光电性能和光催化性能的作用，推进了耐用金属卤氧化物的合成和设计。该项目还将支持教育和外展活动，通过与 Wonderlab（印第安纳州布卢明顿的儿童科学博物馆）和印第安纳大学 ScienceFest 的合作，向非科学家介绍能源概念。该奖项反映了 NSF 的法定使命，并通过使用基金会的智力价值和更广泛的影响审查标准进行评估，被认为值得支持。

项目成果

Local structure analysis and structure mining for design of photocatalytic metal oxychloride intergrowths

• DOI: 10.1039/d2ta05663a
• 发表时间: 2022
• 期刊: Journal of Materials Chemistry A
• 影响因子: 11.9
• 作者: Kaustav Chatterjee;Nicolas P L Magnard;J. Mathiesen;K. Jensen;S. Skrabalak

Durable Metal Heteroanionic Photocatalysts

耐用金属杂阴离子光催化剂

• DOI: 10.1021/acsami.1c09774
• 发表时间: 2021
• 期刊: ACS Applied Materials & Interfaces
• 影响因子: 9.5
• 作者: Chatterjee, Kaustav;Skrabalak, Sara E.
• 通讯作者: Skrabalak, Sara E.

Crystal structures of three β-halolactic acids: hydrogen bonding resulting in differing Z ′

三种 β-卤代乳酸的晶体结构：氢键导致不同的 Z ∀2

• DOI: 10.1107/s2053229622002856
• 发表时间: 2022
• 期刊: Acta Crystallographica Section C Structural Chemistry
• 作者: Gordon, Matthew N.;Liu, Yanyao;Shafei, Ibrahim H.;Brown, M. Kevin;Skrabalak, Sara E.
• 通讯作者: Skrabalak, Sara E.