Xu Maoping, Wang Rui, Bian Kan, Hou Chuang, Wu Yaxing, Tai Guoan
The State Key Laboratory of Mechanics and Control of Mechanical Structures, Laboratory of Intelligent Nano Materials and Devices of Ministry of Education, College of Aerospace Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, People's Republic of China.
School of Material Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, People's Republic of China.
Nanotechnology. 2021 Nov 22;33(7). doi: 10.1088/1361-6528/ac368a.
Recently, two-dimensional (2D) boron nanosheets have been predicted to exhibit exceptional physical and chemical properties, which is expected to be widely used in advanced electronics, optoelectronic, energy storage and conversion devices. However, the experimental application of 2D boron nanosheets in hydrogen evolution reactiuon (HER) has not been reported. Here, we have grown ultrathin boron nanosheets on tungsten foils via chemical vapor deposition. The prepared triclinic boron nanosheets are highly crystalline, which perfectly match the structure in the previous theoretical calculations. Notably, the boron nanosheets show excellent HER performance. The Tafel slope is only 64 mV decand the nanosheets can maintain good stability under long-time cycle in acidic solution. The improvement of performance is mainly due to the metal properties and a large number of exposed active sites on the boron nanosheets, which is confirmed by first-principle calculations.
最近，二维（2D）硼纳米片被预测具有优异的物理和化学性质，有望广泛应用于先进电子、光电子、能量存储和转换器件。然而，二维硼纳米片在析氢反应（HER）中的实验应用尚未见报道。在此，我们通过化学气相沉积法在钨箔上生长了超薄硼纳米片。制备的三斜硼纳米片具有高度结晶性，与先前理论计算中的结构完美匹配。值得注意的是，硼纳米片表现出优异的析氢反应性能。塔菲尔斜率仅为64 mV/dec，且该纳米片在酸性溶液中长时间循环下能保持良好的稳定性。性能的提升主要归因于硼纳米片的金属特性和大量暴露的活性位点，这一点通过第一性原理计算得到了证实。
