原位多孔化 MoS2 纳米岛增强 HER/OER 双功能电催化,Small

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原位多孔化 MoS2 纳米岛增强 HER/OER 双功能电催化
Small ( IF 13.0 ) Pub Date : 2023-01-26 , DOI: 10.1002/smll.202207177
Bo Chen ₁ , Ping Hu ₁ , Fan Yang ₁ , Xingjiang Hua ₁ , Fairy Fan Yang ₁ , Fei Zhu ₁ , Ruiyan Sun ₁ , Ke Hao ₁ , Kuaishe Wang ₁ , Zongyou Yin ₂

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二维二硫化钼 (MoS ₂ ) 被开发为一种潜在的替代非贵金属电催化剂，用于能量转换。众所周知，2D MoS ₂具有三个主要相2H、1T和1T'。然而，与边缘位点相比，最稳定的 2H 相在其基面显示出较差的电催化作用。在这项工作中，报道了一种简单的一步水热驱动原位多孔化 MoS ₂成自支撑纳米岛，以最大限度地暴露 MoS _{2晶粒的边缘，从而有效利用 MoS}₂边缘的活性稳定位点。结果表明，这种活性、无聚集的纳米岛极大地增强了 MoS ₂的析氢反应 (HER) 和析氧反应 (OER) 双功能电催化活性。在 248 和 300 mV 的低过电势下，多孔 MoS ₂纳米岛可以在 HER 和 OER 中产生 10 mA cm ^-2的电流密度，这比典型的纳米片形态要好得多。令人惊讶的是，多孔 MoS ₂纳米岛甚至在 OER 中表现出比目前商业化的 RuO _{2催化剂更好的性能。}这一发现将是推动稳健的 2H 相代替 1T/1T' 相 MoS ₂实现高效耐用双功能 HER/OER 的另一种有效策略，有望在工业上进一步取代贵金属催化剂。

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In Situ Porousized MoS2 Nano Islands Enhance HER/OER Bifunctional Electrocatalysis

2D molybdenum disulfide (MoS₂) is developed as a potential alternative non-precious metal electrocatalyst for energy conversion. It is well known that 2D MoS₂ has three main phases 2H, 1T, and 1T′. However, the most stable 2H-phase shows poor electrocatalysis in its basal plane, compared with its edge sites. In this work, a facile one-step hydrothermal-driven in situ porousizing of MoS₂ into self-supporting nano islands to maximally expose the edges of MoS₂ grains for efficient utilization of the active stable sites at the edges of MoS₂ is reported. The results show that such active, aggregation-free nano islands greatly enhance MoS₂'s hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) bifunctional electrocatalytic activities. At a low overpotential of 248 and 300 mV, the porous MoS₂ nano islands can generate a current density of 10 mA cm⁻² in HER and OER, which is much better than typical nanosheet morphology. Surprisingly, the porous MoS₂ nano islands even exhibit better performance than the current commercial RuO₂ catalyst in OER. This discovery will be another effective strategy to promote robust 2H-phase, instead of 1T/1T′-phase, MoS₂ to achieve efficient endurable bifunctional HER/OER, which is expected to further replace precious metal catalysts in industry.

更新日期：2023-01-26

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