Ji Yu, Hao Guang-Ping, Tan Yong-Tao, Xiong Wenqi, Liu Yu, Zhou Wenzhe, Tang Dai-Ming, Ma Renzhi, Yuan Shengjun, Sasaki Takayoshi, Lozada-Hidalgo Marcelo, Geim Andre K, Sun Pengzhan
Institute of Applied Physics and Materials Engineering, University of Macau, Macau, China.
State Key Laboratory of Fine Chemicals, School of Chemical Engineering, Dalian University of Technology, Dalian, Liaoning, China.
Nat Commun. 2024 Dec 4;15(1):10546. doi: 10.1038/s41467-024-54544-z.
Two dimensional (2D) crystals have attracted strong interest as a new class of proton-conducting materials that can block atoms, molecules and ions while allowing proton transport through the atomically thin basal planes. Although 2D materials exhibit this perfect selectivity, the reported proton conductivities have been relatively low. Here we show that vacancy-rich titania monolayers are highly permeable to protons while remaining impermeable to helium with proton conductivity exceeding 100 S cm at 200 °C and surpassing targets set by industry roadmaps. The fast and selective proton transport is attributed to an extremely high density of titanium-atom vacancies (one per square nm), which effectively turns titania monolayers into angstrom-scale sieves. Our findings highlight the potential of 2D oxides as membrane materials for hydrogen-based technologies.
二维（2D）晶体作为一类新型的质子传导材料引起了人们浓厚的兴趣，这类材料能够阻挡原子、分子和离子，同时允许质子通过原子级薄的基面进行传输。尽管二维材料具有这种完美的选择性，但报道的质子电导率相对较低。在此，我们表明富含空位的二氧化钛单层对质子具有高度渗透性，而对氦气则不可渗透，在200°C时质子电导率超过100 S cm，超过了行业路线图设定的目标。快速且选择性的质子传输归因于极高密度的钛原子空位（每平方纳米一个），这有效地将二氧化钛单层转变为埃级筛网。我们的发现突出了二维氧化物作为氢基技术膜材料的潜力。
