北京大学马丁团队宣布他们探明了通过惰性纳米覆盖层屏蔽Pt/γ-Mo₂N，可以实现稳定的H₂生成。该项研究成果发表在2025年2月12日出版的《自然》上。

在这里，小组报告了一种新的策略来增加高活性界面催化剂的结构稳定性，通过主题化惰性纳米覆盖层来部分屏蔽和划分反应载体的表面。具体来说，该课题组研究人员证明了原子分散的惰性氧化物纳米覆盖层在高活性Pt/γ-Mo₂N催化剂上可以阻断γ-Mo₂N的冗余表面位点，这些位点负责反应载体的表面氧化并导致失活。这一策略产生了一种高效耐用的催化剂，用于甲醇重整反应制氢，催化剂的效率仅为0.26wt% Pt负载，显示出创纪录的周转率，据他们所知，15,300,000和显著的表观周转率为24500 molH₂ mol^-1_metal h^-1。这种创新的方法展示了减少贵金属消耗和延长寿命的前景，可以应用于设计有效和稳定的多相催化剂。

研究人员表示，通过将负载型金属催化剂中的竞争性反应物吸附-活化模式调整为非竞争性机制，活性载体分散金属物种的主题对于构建高效界面催化剂至关重要。然而，这些活性载体在催化过程中容易变质，限制了催化剂的使用寿命和潜在的实际应用。需要新的策略来同时保护活性载体和表面金属，而不影响其固有的催化性能。

附：英文原文

Title: Shielding Pt/γ-Mo2N by inert nano-overlays enables stable H2 production

Author: Gao, Zirui, Li, Aowen, Liu, Xingwu, Peng, Mi, Yu, Shixiang, Wang, Maolin, Ge, Yuzhen, Li, Chengyu, Wang, Tie, Wang, Zhaohua, Zhou, Wu, Ma, Ding

Issue&Volume: 2025-02-12

Abstract: The use of reactive supports to disperse metal species is crucial for constructing highly efficient interfacial catalysts, by tuning the competitive reactant adsorption–activation pattern in supported metal catalysts into a non-competitive mechanism1,2,3. However, these reactive supports are prone to deterioration during catalysis, limiting the lifespan of the catalyst and their potential practical applications4. New strategies are needed to simultaneously protect reactive supports and surface metal species without compromising the inherent catalytic performance. Here we report a new strategy to augment the structural stability of highly active interfacial catalysts by using inert nano-overlays to partially shield and partition the surface of the reactive support. Specifically, we demonstrate that atomically dispersed inert oxide nano-overlays on a highly active Pt/γ-Mo2N catalyst can block the redundant surface sites of γ-Mo2N responsible for surface oxidation of this reactive support and the resulting deactivation. This strategy yields an efficient and highly durable catalyst for hydrogen production by methanol-reforming reaction with a mere 0.26wt% Pt loading, exhibiting a record-high turnover number, to our knowledge, of 15,300,000 and a notable apparent turnover frequency of 24500 mol_H2 mol^-1_metal h^-1. This innovative approach showcases the prospects of reducing noble metal consumption and boosting longevity, which could be applied to design effective and stable heterogeneous catalysts.

DOI: 10.1038/s41586-024-08483-w

Source: https://www.nature.com/articles/s41586-024-08483-w