<br>原位构建具有光热和互催化效应的界面，用于高效太阳能驱动的 MgH2 可逆储氢,Advanced Science

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原位构建具有光热和互催化效应的界面，用于高效太阳能驱动的 MgH2 可逆储氢
Advanced Science ( IF 14.3 ) Pub Date : 2024-03-22 , DOI: 10.1002/advs.202400274
Xuechun Hu ₁ , Xiaowei Chen ₂ , Xiaoyue Zhang ₁ , Yang Meng ₁ , Guanglin Xia ₁ , Xuebin Yu ₁ , Dalin Sun ₁ , Fang Fang _{1,

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Affiliation

MgH ₂储氢是实现氢气安全储存的理想解决方案。然而，由于高热力学稳定性和动力学势垒，MgH ₂储氢需要高操作温度。在此，制备了由涂有TiN纳米颗粒的N掺杂TiO ₂纳米片均匀构建的花状微球，以在纳米尺度上集成光吸收剂和热化学催化剂，用于利用太阳能驱动MgH ₂的储氢。 N掺杂的TiO ₂在循环过程中原位转化为均匀分布在TiN基体内部的TiN _x O _y和Ti/TiH ₂ ，其中TiN和Ti/TiH _x对作为光吸收剂，表现出强烈的局域表面等离子体共振效应全光谱光吸收能力。另一方面，理论和实验证明TiH ₂和MgH ₂之间的紧密界面不仅可以在热力学和动力学上促进H ₂从MgH ₂中解吸，而且同时削弱Ti─H键，从而促进H ₂解吸。由弱化的 Ti─H 和 Ti─H 键结合而成。光热效应和催化效应的统一结合导致TiN产生的局部热量直接作用于引发催化效应，实现了在27个太阳光下容量为6.1wt.%的MgH ₂储氢。

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In Situ Construction of Interface with Photothermal and Mutual Catalytic Effect for Efficient Solar-Driven Reversible Hydrogen Storage of MgH2

Hydrogen storage in MgH₂ is an ideal solution for realizing the safe storage of hydrogen. High operating temperature, however, is required for hydrogen storage of MgH₂ induced by high thermodynamic stability and kinetic barrier. Herein, flower-like microspheres uniformly constructed by N-doped TiO₂ nanosheets coated with TiN nanoparticles are fabricated to integrate the light absorber and thermo-chemical catalysts at a nanometer scale for driving hydrogen storage of MgH₂ using solar energy. N-doped TiO₂ is in situ transformed into TiN_xO_y and Ti/TiH₂ uniformly distributed inside of TiN matrix during cycling, in which TiN and Ti/TiH_x pairs serve as light absorbers that exhibit strong localized surface plasmon resonance effect with full-spectrum light absorbance capability. On the other hand, it is theoretically and experimentally demonstrated that the intimate interface between TiH₂ and MgH₂ can not only thermodynamically and kinetically promote H₂ desorption from MgH₂ but also simultaneously weaken Ti─H bonds and hence in turn improve H₂ desorption from the combination of weakened Ti─H and Ti─H bonds. The uniform integration of photothermal and catalytic effect leads to the direct action of localized heat generated from TiN on initiating the catalytic effect in realizing hydrogen storage of MgH₂ with a capacity of 6.1 wt.% under 27 sun.

更新日期：2024-03-22

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