Morphology‐Tuned Pt3Ge Accelerates Water Dissociation to Industrial‐Standard Hydrogen Production over a wide pH Range. Issue 30 (17th June 2022)

• Record Type: Journal Article
• Authors: Mondal, Soumi; Sarkar, Shreya; Bagchi, Debabrata; Das, Tisita; Das, Risov; Singh, Ashutosh Kumar; Prasanna, Ponnappa Kechanda; Vinod, C. P.; Chakraborty, Sudip; Peter, Sebastian C.
• Is Part Of: Advanced materials. Volume 34:Issue 30(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2022-06-17
• Subjects: electrochemistry -- hydrogen production -- intermetallics -- water electrolysis; Materials -- Periodicals; Chemical vapor deposition -- Periodicals; 620.11
• DOI: 10.1002/adma.202202294
• Languages: English
• ISSNs: 0935-9648

Abstract

Abstract: The discovery of novel materials for industrial‐standard hydrogen production is the present need considering the global energy infrastructure. A novel electrocatalyst, Pt3 Ge, which is engineered with a desired crystallographic facet (202), accelerates hydrogen production by water electrolysis, and records industrially desired operational stability compared to the commercial catalyst platinum is introduced. Pt3 Ge‐(202) exhibits low overpotential of 21.7 mV (24.6 mV for Pt/C) and 92 mV for 10 and 200 mA cm −2 current density, respectively in 0.5 m H2 SO4 . It also exhibits remarkable stability of 15 000 accelerated degradation tests cycles (5000 for Pt/C) and exceptional durability of 500 h (@10 mA cm −2 ) in acidic media. Pt3 Ge‐(202) also displays low overpotential of 96 mV for 10 mA cm −2 current density in the alkaline medium, rationalizing its hydrogen production ability over a wide pH range required commercial operations. Long‐term durability (>75 h in alkaline media) with the industrial level current density (>500 mA cm −2 ) has been demonstrated by utilizing the electrochemical flow reactor. The driving force behind this stupendous performance of Pt3 Ge‐(202) has been envisaged by mapping the reaction mechanism, active sites, and charge‐transfer kinetics via controlled electrochemical experiments, ex situ X‐ray photoelectron spectroscopy, in situ infrared spectroscopy, and in situ X‐ray absorption spectroscopy further corroborated by first principles calculations. Abstract : A novel electrocatalyst, Pt3 Ge, engineered with a desired crystallographic facet (202) accelerates the hydrogen production by water electrolysis and records industrially desired operational stability over a wide range of pH compared to the commercial catalyst platinum on carbon. The driving force behind this stupendous performance is envisaged by mapping the reaction mechanism, active sites, and charge‐transfer kinetics in various in situ and ex situ experiments corroborated by the first principles calculations.