The Gibbs free energy of MoS₂ for H⁺ absorption is near-zero, which is considered to be a promising cocatalyst for H₂ production. Nevertheless, the activity of MoS₂ for HER is greatly limited by the acidic environment. Herein, we study that Co-doped MoS₂ (Co-MoS₂) nanosheets can realize an extremely efficient photocatalytic H₂ production of g-C₃N₄ nanosheet (NSs) in alkalescent environment, such as triethanolamine (TEOA). The optimized Co-MoS₂/g-C₃N₄ hybrids exhibits extremely boosted photocatalytic H₂ evolution rate of 3193 μmol^-1 h^-1 g^-1, approximately 2.4, 6.0 and 42.0 times as much as MoS₂/g-C₃N₄ (1326 μmol^-1 h^-1 g^-1), CoS₂/g-C₃N₄ (530 μmol^-1 h^-1 g^-1) and pure g-C₃N₄ (76 μmol^-1 h^-1 g^-1), respectively. Besides, we calculated the apparent quantum efficiency (AQE) of all photocatalysts under the light at λ=370 nm, and the AQE of Co-MoS₂/g-C₃N₄ hybrids reaches 16.62%. DFT calculation and experimental data reveal that the outstanding HER activity of Co-MoS₂/g-C₃N₄ hybrids is ascribed to the Co doping inducing the distortion of MoS₂ crystal, which effectively reduces the H binding free energy for HER. The project of Co-MoS₂/g-C₃N₄ hybrids provides experience on the progress of low-cost and highly effective photocatalysts for photocatalytic H₂ evolution.

MoS ₂吸收H ⁺的吉布斯自由能接近于零，被认为是产生H ₂的有前途的助催化剂。然而，MoS ₂对HER的活性受到酸性环境的极大限制。在本文中，我们研究了共掺杂的MoS ₂（Co-MoS ₂）纳米片可以在碱性环境如三乙醇胺（TEOA）中实现gC ₃ N ₄纳米片（NSs）的非常高效的光催化H ₂产生。优化的Co-MoS ₂ / gC ₃ N ₄杂化物表现出极强的光催化H ₂含量演化速率为3193μmol ^-1 h ^-1 g ^-1，约为MoS ₂ / gC ₃ N ₄（1326μmol ^-1 h ^-1 g ^-1），CoS ₂ / gC ₃ N的2.4、6.0和42.0倍₄（530μmol ^-1 h ^-1 g ^-1）和纯gC ₃ N ₄（76μmol ^-1 h ^-1 g ^-1）， 分别。此外，我们计算了所有光催化剂在λ= 370 nm光下的表观量子效率（AQE），Co-MoS ₂ / gC ₃ N ₄杂化体的AQE达到16.62％。DFT计算和实验数据表明，Co-MoS ₂ / gC ₃ N ₄杂化物的优异HER活性归因于Co掺杂引起MoS ₂晶体的畸变，从而有效降低了HER的H结合自由能。Co-MoS ₂ / gC ₃ N ₄杂化项目为光催化H ₂低成本和高效光催化剂的发展提供了经验 进化。