Chao Fan, Kang Wang, Ruihang Hu and Yan-Qin Wang*,
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引用次数: 0
Abstract
The development of highly efficient nonprecious metal electrocatalysts for hydrogen evolution reaction (HER) is important and urgent. Herein, a heterostructured electrocatalyst Mo–CoP/Yb2O3 was fabricated between Mo-doped CoP and rare-earth oxide Yb2O3. Mo–CoP/Yb2O3 not only displays outstanding HER activity but also exhibits outstanding urea oxidation and hydrazine oxidation activity, for which the HER activity is indicated by the low overpotential values of 33 mV at 10 mA cm–2 and 100 mV at 100 mA cm–2, the urea oxidation performance with the potential of 1.449 V vs RHE at 100 mA cm–2, and the hydrazine oxidation performance with the potential of 0.153 V vs RHE at 100 mA cm–2. Further, when Mo–CoP/Yb2O3 was used as both the cathode and anode for urea-assisted hydrogen production (cell voltage of 1.513 V at 100 mA cm–2) and hydrazine oxidation-assisted hydrogen production (cell voltage of 0.253 V at 100 mA cm–2), it is economically advantageous. The results show that Mo-doped CoP plays a significant role in the catalytic process, while the incorporation of Yb2O3 can enhance the catalyst’s hydrophilicity and increase the water adsorption, potentially aiding in water splitting. Besides, the synergistic effect of Mo doping and heterostructure regulates the electronic structure and facilitates the electron transfer, thus improving the HER activity of Mo–CoP/Yb2O3.
开发高效的非贵金属析氢电催化剂具有重要的现实意义。本文在mo掺杂的CoP和稀土氧化物Yb2O3之间制备了异质结构的电催化剂Mo-CoP /Yb2O3。Mo-CoP /Yb2O3不仅表现出优异的HER活性,还表现出优异的尿素氧化和肼氧化活性,其中HER活性表现为在10 mA cm-2和100 mA cm-2下的过电位值分别为33 mV和100 mV,在100 mA cm-2下的尿素氧化性能为1.449 V vs RHE,肼氧化性能为0.153 V vs RHE。此外,当Mo-CoP /Yb2O3同时作为阴极和阳极用于尿素辅助制氢(电池电压为1.513 V, 100 mA cm-2)和肼氧化辅助制氢(电池电压为0.253 V, 100 mA cm-2)时,具有经济优势。结果表明,mo掺杂的CoP在催化过程中起着重要的作用,而Yb2O3的掺入可以增强催化剂的亲水性,增加吸水性,可能有助于水的分解。此外,Mo掺杂与异质结构的协同作用调节了电子结构,促进了电子转移,从而提高了Mo - cop /Yb2O3的HER活性。
期刊介绍:
ACS Applied Energy Materials is an interdisciplinary journal publishing original research covering all aspects of materials, engineering, chemistry, physics and biology relevant to energy conversion and storage. The journal is devoted to reports of new and original experimental and theoretical research of an applied nature that integrate knowledge in the areas of materials, engineering, physics, bioscience, and chemistry into important energy applications.