Synthesis of High Metal Loading Single Atom Catalysts and Exploration of the Active Center Structure
Synthesis of High Metal Loading Single Atom Catalysts and Exploration of the Active Center Structure
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DOI：
10.1002/cctc.202001255
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发表时间：
2020-11
期刊：
影响因子：
4.5
通讯作者：
Kaiying Wang;Xiaofeng Wang;Xinhua Liang
中科院分区：
文献类型：
--
作者：
Kaiying Wang;Xiaofeng Wang;Xinhua Liang
单原子催化剂（SAC）最近作为催化领域的新前沿而兴起。由于最大的原子利用效率和可调节的电子结构，SAC 表现出与块状同类产品截然不同的催化性能。具有高金属负载量的SAC将有利于实际应用。为此，本次审查重点关注最大限度地提高金属装载量的最新策略。合适的基材（主要是杂原子掺杂碳材料）是避免合成过程中聚集或烧结的关键。采用配位位点构建和空间限制策略来制备高金属负载量的SAC。具有原子分辨率的先进表征技术对于识别 SAC 的精确结构是必不可少的。确实如此，特别是对于本综述中讨论的原子级原位/操作表征技术开发的应用和挑战。此外，从根本上有必要研究活性中心结构，这有助于设计能够最大化单原子催化活性的高效 SAC。此外，本次审查还强调了 SAC 发展的挑战和前景。
Single‐atom catalysts (SACs) have been rising recently as a new frontier in the catalysis field. Due to maximum atom utilization efficiency and tunable electronic structures, SACs exhibit highly distinctive catalytic performance from bulk counterparts. SACs with high metal loading will facilitate practical applications. To that end, this Review focuses on recent strategies to maximize metal loading. An appropriate substrate, mainly heteroatom‐doped carbon materials, is the key to avoiding aggregation or sintering during synthetic procedures. The coordination site construction and spatial confinement strategies are adopted to prepare SACs with high metal loading. Advanced characterization techniques with atomic resolution are indispensable for identification of the exact structure of SACs. This is true, especially for the applications and challenges in developing in situ/operando characterization techniques at the atomic level, which are discussed in this Review. Moreover, it is fundamentally necessary to investigate the active center structure, which facilitates any design of efficient SACs that can maximize single‐atom catalytic activity. Furthermore, this Review highlights challenges and prospects for development of SACs.