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Achieving Rich and Active Alkaline Hydrogen Evolution Heterostructures via Interface Engineering on 2D 1T‐MoS2 Quantum Sheets
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2020-04-29 , DOI: 10.1002/adfm.202000551
Wenshu Chen 1, 2 , Jiajun Gu 1 , Yongping Du 3 , Fang Song 1 , Fanxing Bu 4 , Jinghan Li 1 , Yang Yuan 1 , Ruichun Luo 1 , Qinglei Liu 1 , Di Zhang 1
Affiliation  

Large‐scale production of hydrogen from water‐alkali electrolyzers is impeded by the sluggish kinetics of hydrogen evolution reaction (HER) electrocatalysts. The hybridization of an acid‐active HER catalyst with a cocatalyst at the nanoscale helps boost HER kinetics in alkaline media. Here, it is demonstrated that 1T–MoS2 nanosheet edges (instead of basal planes) decorated by metal hydroxides form highly active edge 1T‐MoS 2 / edge Ni ( OH ) 2 heterostructures, which significantly enhance HER performance in alkaline media. Featured with rich edge 1T‐MoS 2 / edge Ni ( OH ) 2 sites, the fabricated 1T–MoS2 QS/Ni(OH)2 hybrid (quantum sized 1T–MoS2 sheets decorated with Ni(OH)2 via interface engineering) only requires overpotentials of 57 and 112 mV to drive HER current densities of 10 and 100 mA cm−2, respectively, and has a low Tafel slope of 30 mV dec−1 in 1 m KOH. So far, this is the best performance for MoS2‐based electrocatalysts and the 1T–MoS2 QS/Ni(OH)2 hybrid is among the best‐performing non‐Pt alkaline HER electrocatalysts known. The HER process is durable for 100 h at current densities up to 500 mA cm−2. This work not only provides an active, cost‐effective, and robust alkaline HER electrocatalyst, but also demonstrates a design strategy for preparing high‐performance catalysts based on edge‐rich 2D quantum sheets for other catalytic reactions.

中文翻译:

通过界面工程在2D 1T-MoS2量子片上实现丰富而活跃的碱性氢析出异质结构

氢析出反应(HER)电催化剂的动力学缓慢会阻碍水碱电解器大规模生产氢。酸性活性HER催化剂与助催化剂的纳米级杂交有助于提高碱性介质中的HER动力学。在这里,证明了由金属氢氧化物修饰的1T–MoS 2纳米片边缘(而不是基面)形成了高活性 边缘 1T-MoS 2 / 边缘 2 异质结构,可显着增强HER在碱性介质中的性能。特色丰富 边缘 1T-MoS 2 / 边缘 2 在现场,制造的1T–MoS 2 QS / Ni(OH)2混合材料(通过界面工程用Ni(OH)2装饰的量子尺寸的1T–MoS 2薄板)仅需要57和112 mV的超电势即可驱动10的HER电流密度分别为100 mA cm -2和100 mA cm -2,并且在1 m KOH中具有30 mV dec -1的低Tafel斜率。到目前为止,这是基于MoS 2的电催化剂的最佳性能,而1T–MoS 2 QS / Ni(OH)2杂化剂是已知性能最佳的非Pt碱性HER电催化剂之一。HER过程在电流密度高达500 mA cm -2的情况下可持续100小时。这项工作不仅提供了一种活性,成本效益高且坚固的碱性HER电催化剂,而且还展示了一种设计策略,该策略可基于富含边缘的2D量子片制备高性能催化剂用于其他催化反应。
更新日期:2020-06-18
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