微波诱导的结构工程和6R-TaS2中的Pt捕集氢释放反应,Small

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微波诱导的结构工程和6R-TaS2中的Pt捕集氢释放反应
Small ( IF 13.0 ) Pub Date : 2020-11-23 , DOI: 10.1002/smll.202003372
Leyla Najafi _{1,

2} , Sebastiano Bellani _{1,

2} , Reinier Oropesa‐Nuñez _{2,

3} , Rosaria Brescia ₄ , Mirko Prato ₅ , Lea Pasquale ₅ , Cansunur Demirci ₆ , Filippo Drago ₆ , Beatriz Martín‐García ₁ , Jan Luxa ₇ , Liberato Manna ₆ , Zdeněk Sofer ₇ , Francesco Bonaccorso _{1,

2}

Affiliation

过渡金属二卤化物（TMDs）结构的纳米工程被广泛追求，以开发可行的催化剂来代替贵金属催化剂而进行氢释放反应（HER）。事实证明，第5类金属TMD在酸性介质中是HER的有效催化剂，从而使人们能够负担得起真正的质子交换膜水电解槽。它们的关键优势在于，其基面和边缘都对HER具有催化活性。在这项工作中，“重新发现”和设计了TaS ₂的6R阶段。液相微波处理可用于改变6R- TaS ₂的结构性能液相剥离产生的纳米薄片。纳米薄片的碎裂及其从单晶结构到部分多晶结构的演变提高了HER活性，将10 mA cm ^-2的阴极电流下的过电势从0.377 V降低到0.119V 。此外，6R ‐TaS ₂纳米薄片可为牢固地捕获Pt物种，这些物种在50 mV的超电势下达到10000 A g _Pt^-1的质量活度（MA在72 mV的超电势下达到20000 A g _Pt^-1），代表MA的20倍增长为Pt / C参考测得的Pt值，并接近Pt质量活动的最新水平。

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Microwave‐Induced Structural Engineering and Pt Trapping in 6R‐TaS2 for the Hydrogen Evolution Reaction

The nanoengineering of the structure of transition metal dichalcogenides (TMDs) is widely pursued to develop viable catalysts for the hydrogen evolution reaction (HER) alternative to the precious metallic ones. Metallic group‐5 TMDs have been demonstrated to be effective catalysts for the HER in acidic media, making affordable real proton exchange membrane water electrolysers. Their key‐plus relies on the fact that both their basal planes and edges are catalytically active for the HER. In this work, the 6R phase of TaS₂ is “rediscovered” and engineered. A liquid‐phase microwave treatment is used to modify the structural properties of the 6R‐TaS₂ nanoflakes produced by liquid‐phase exfoliation. The fragmentation of the nanoflakes and their evolution from monocrystalline to partly polycrystalline structures improve the HER‐activity, lowering the overpotential at cathodic current of 10 mA cm⁻² from 0.377 to 0.119 V. Furthermore, 6R‐TaS₂ nanoflakes act as ideal support to firmly trap Pt species, which achieve a mass activity (MA) up 10 000 A g_Pt⁻¹ at overpotential of 50 mV (20 000 A g_Pt⁻¹ at overpotentials of 72 mV), representing a 20‐fold increase of the MA of Pt measured for the Pt/C reference, and approaching the state‐of‐the‐art of the Pt mass activity.

更新日期：2020-12-17

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