Co-Doped MoS2 Nanosheets with the Dominant CoMoS Phase Coated on Carbon as an Excellent Electrocatalyst for Hydrogen Evolution

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• 作者：Xiaoping Dai ; Kangli Du ; Zhanzhao Li ; Mengzhao Liu ; Yangde Ma ; Hui Sun ; Xin Zhang ; Ying Yang
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2015
• 出版时间：December 16, 2015
• 年：2015
• 卷：7
• 期：49
• 页码：27242-27253
• 全文大小：803K
• ISSN：1944-8252

文摘

Highly active and low-cost catalysts for hydrogen evolution reaction (HER) are crucial for the development of efficient water splitting. Molybdenum disulfide (MoS₂) nanosheets possess unique physical and chemical properties, which make them promising candidates for HER. Herein, we reported a facile, effective, and scalable strategy by a deposition鈥損recipitation method to fabricate metal-doped (Fe, Co, Ni) molybdenum sulfide with a few layers on carbon black as noble metal鈥揻ree electrocatalysts for HER. The CoMoS phase after thermal annealing in Co-doped MoS₂ plays a crucial role for the enhanced HER. The optimized Co-doped MoS₂ catalyst shows superior HER performance with a high exchange current density of 0.03 mA路cm^鈥?, low onset potential of 90 mV, and small Tafel slope of 50 mV路dec^鈥?, which also exhibits excellent stability of 10000 cycles with negligible loss of the cathodic current. The superior HER activity originates from the synergistically structural and electronic modulations between MoS₂ and Co ions, abundant defects in the active edge sites, as well as the good balance between active sites and electronic conductivity. Thanks to their ease of synthesis, low cost, and high activity, the Co-doped MoS₂ catalysts appear to be promising HER catalysts for electrochemical water splitting.