Details

Autor(en) / Beteiligte

• Peng, Ye‐Wang
• Shan, Changsheng
• Wang, Hong‐Juan
• Hong, Lu‐Ying
• Yao, Shuang
• Wu, Rui‐Juan
• Zhang, Zhi‐Ming
• Lu, Tong‐Bu

Titel

Polyoxometalate‐Derived Ultrasmall Pt2W/WO3 Heterostructure Outperforms Platinum for Large‐Current‐Density H2 Evolution

Ist Teil von

• Advanced energy materials, 2019-07, Vol.9 (26), p.n/a

Ort / Verlag

Weinheim: Wiley Subscription Services, Inc

Erscheinungsjahr

2019

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• Platinum (Pt)‐based catalysts with high Pt utilization efficiency for efficient H2 evolution are attracting extensive attention to meet the issues of energy exhaustion and environmental pollution. Herein, a one‐step electrochemical method is demonstrated to construct ultrafine heterostructure Pt2W/WO3 on reduced graphene oxide (RGO) by injecting multielectrons into the Preyssler anion [NaP5W30O110]14− to codeposit with anodic deliquescent Pt cations. The resulting Pt2W/WO3/RGO shows much higher performance than that of commercial Pt catalysts for large‐current‐density H2 evolution, which can deliver a large current density of 500 mA cm−2 with an overpotential of only 394 mV, much lower than that of 20% Pt/C (578 mV). Comparisons with control experiments and density functional theory (DFT) calculations both suggest that the much enhanced activity can be mainly attributed to the synergistic cooperation of different components to drive fast and continuous hydrogen desorption on Pt2W/WO3/RGO, while it could not run normally for 20% Pt/C under similar conditions due to the formation of huge bubbles on the electrode surface. The effective integration of high catalytic activity and hydrogen desorption ability into a single material can yield advanced materials for large‐current‐density H2 evolution with remarkable stability. A polyoxometalate‐derived ultrafine heterostructure Pt2W/WO3 is constructed via a one‐step electrochemical codeposition process. This heterostructure can act as an efficient hydrogen evolution reaction (HER) electrocatalyst with performance that can significantly outperform platinum for large‐current‐density H2 evolution. The effective integration of high catalytic activity and hydrogen desorption ability into a single material represents a promising way to yield advanced materials for large‐current‐density H2 evolution.