定制 MoS2–WS2 (1T/1T, 2H/2H) 的多晶型异质结构以实现高效的析氢反应,ACS Sustainable Chemistry & Engineering

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定制 MoS2–WS2 (1T/1T, 2H/2H) 的多晶型异质结构以实现高效的析氢反应
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2023-01-03 , DOI: 10.1021/acssuschemeng.2c04949
Hyunho Seok ₁ , Minjun Kim ₁ , Jinill Cho ₂ , Eungchul Kim ₂ , Sihoon Son ₁ , Keon-Woo Kim ₃ , Jin Kon Kim ₃ , Pil J. Yoo _{1,

4} , Muyoung Kim ₅ , Hyeong-U Kim ₅ , Taesung Kim _{1,

2}

Affiliation

地球上储量丰富且廉价的过渡金属二硫化物 (TMDC) 具有现有的多晶型（金属 1T 相和半导体 2H 相）已被提议作为贵金属（例如 Pt、Ir 和 Ru）的替代品，以实现有效的析氢反应（HER ). 尽管 TMDCs (1T-TMDCs) 的 1T 相作为 HER 催化剂是必不可少的，但由于缺乏 1T-TMDC 的大规模生产和 1T/1T-TMDC 异质结构制造，尚未实现在 HER 中的实际应用方法。_{此处，针对 1T-MoS 2} /1T-WS ₂垂直异质结构 (1T/1T-MWH) 或 2H-MoS ₂ /2H-WS ₂，报告了 4 英寸晶圆规模的多晶型 TMDC–TMDC 异质结构冷等离子体条件和工艺温度下的垂直异质结构 (2H/2H-MWH)。同时离子轰击到基板上会产生一些具有不连续薄膜的纳米级晶界，从而导致暴露的边缘充当催化活性位点。_{比较了制备的多晶型物（MoS 2}和WS ₂的1T 或2H 相）和1T/1T-MWH 和2H/2H-MWH 的多晶型异质结构的电催化性能。1T/1T-MWH 由于其金属 1T 相和在异质界面处包含合金结构的异质结构而显示出最高的电催化性能。此外，1T/1T-MWH 的纳米颗粒在 1000 次 HER 循环后仍保持其原始状态，证明了它们的坚固性和耐用性。

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Tailoring Polymorphic Heterostructures of MoS2–WS2 (1T/1T, 2H/2H) for Efficient Hydrogen Evolution Reaction

Earth-abundant and inexpensive transition metal dichalcogenides (TMDCs) with existing polymorphisms (metallic 1T phase and semiconducting 2H phase) have been proposed as alternatives to noble metals (e.g., Pt, Ir, and Ru) to achieve an efficient hydrogen evolution reaction (HER). Although the 1T phase of TMDCs (1T-TMDCs) is essential as an HER catalyst, practical application in the HER has not been realized owing to the lack of any large-scale production of the 1T-TMDC and 1T/1T-TMDC heterostructure fabrication method. Here, polymorphic TMDC–TMDC heterostructures at a 4 in. wafer scale is reported for 1T-MoS₂/1T-WS₂ vertical heterostructures (1T/1T-MWH) or 2H-MoS₂/2H-WS₂ vertical heterostructures (2H/2H-MWH) under cold plasma conditions and process temperature. Simultaneous ion-bombardment onto substrates induces a few nanosized grain boundaries with discontinuous films, resulting in exposed edges that act as catalytically active sites. The electrocatalytic performances of the prepared polymorph (1T or 2H phases of MoS₂ and WS₂) and polymorphic heterostructures of 1T/1T-MWH and 2H/2H-MWH are compared. 1T/1T-MWH shows the highest electrocatalytic performance owing to its metallic 1T phase and heterostructures containing alloy structures at the heterointerface. Moreover, the nanosized grains of 1T/1T-MWH preserve their original phase after 1000 HER cycles, proving their robustness and durability.

更新日期：2023-01-03

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