Zheng Haiyan, Li Xiao, Xu Na, Wang Xinlong, Sun Chunyi, Su Zhongmin
Key Lab of Polyoxometalate Science of Ministry of Education, National & Local United Engineering Laboratory for Power Battery Institution, Northeast Normal University, Changchun, Jilin 130024 China.
Jilin Provincial Science and Technology Innovation Center of Optical Materials and Chemistry, School of Chemistry and Environmental Engineering, Changchun University of Science and Technology, Changchun 130022 China.
ACS Omega. 2019 Jun 14;4(6):10347-10353. doi: 10.1021/acsomega.9b00844. eCollection 2019 Jun 30.
The development of cost-efficient, highly active, and stable electrocatalysts toward hydrogen evolution reaction (HER) is vital for energy conversion and clean hydrogen production. Herein, the novel electrocatalyst, porous carbon-coated Ni/β-MoC (Ni/β-MoC@PC), possesses favorable hydrogen production performance and stability in a wide range of pH via a facile dicyandiamide-blowing and one-step synthesis method. The resultant Ni/β-MoC@PC displays pleasurable HER performance with low overpotentials of 123, 155, and 179 mV at 10 mA cm in 1 M KOH, 0.5 M HSO, and 1 M phosphate buffer solution (PBS), respectively. Furthermore, Ni/β-MoC@PC retains high durability with quite little decay after 24 h stability test, suggesting the excellent activity and stability of Ni/β-MoC@PC served as HER electrocatalysts. Otherwise, it is advantageous compared with Ni@PC, MoC@PC, and most other nonprecious metal electrocatalysts. Benefiting from the synergistic effect of the two popular active species, uniform distribution, and porous carbon coating, these porous nanoelectrocatalysts showcase satisfactory electrocatalytic activity, improving the charge transfer and kinetics during the reaction. This work possesses significant universality, which can be applicable to the synthesis of diverse nanostructured noble metal-free catalysts.
开发具有成本效益、高活性和稳定性的析氢反应（HER）电催化剂对于能量转换和清洁制氢至关重要。在此，通过简便的双氰胺吹气和一步合成法制备的新型电催化剂多孔碳包覆的Ni/β-MoC（Ni/β-MoC@PC）在广泛的pH范围内具有良好的产氢性能和稳定性。所得的Ni/β-MoC@PC在1 M KOH、0.5 M H₂SO₄和1 M磷酸盐缓冲溶液（PBS）中，在10 mA cm⁻²电流密度下的过电位分别低至123、155和179 mV，展现出优异的析氢性能。此外，经过24小时稳定性测试后，Ni/β-MoC@PC的耐久性很高，衰减很小，表明其作为析氢电催化剂具有优异的活性和稳定性。此外，与Ni@PC、MoC@PC和大多数其他非贵金属电催化剂相比，它具有优势。受益于两种常见活性物种的协同效应、均匀分布和多孔碳包覆，这些多孔纳米电催化剂展现出令人满意的电催化活性，改善了反应过程中的电荷转移和动力学。这项工作具有重要的通用性，可适用于多种纳米结构无贵金属催化剂的合成。
