Enabling efficient hydrogen-evolution reaction over perovskite oxide electrocatalysts through phosphorus promotion. (21st September 2020)

• Record Type: Journal Article
• Authors: Zhang, Zhenbao; Zhou, Wulan; Yang, Ziwei; Jiang, Jiahui; Chen, Dengjie; Shao, Zongping
• Is Part Of: International journal of hydrogen energy. Volume 45:Number 46(2020)
• Page Start: 24859
• Page End: 24869
• Publication Date: 2020-09-21
• Subjects: Perovskite oxide -- Ba0.5Sr0.5Co0.8Fe0.2O3-δ -- Phosphorus modification -- Hydrogen evolution reaction; Hydrogen as fuel -- Periodicals; Hydrogène (Combustible) -- Périodiques; Hydrogen as fuel; Periodicals; 665.81
• DOI: 10.1016/j.ijhydene.2020.06.298
• Languages: English
• ISSNs: 0360-3199

Abstract

Abstract: In this work, we have demonstrated that by modifying Ba0.5 Sr0.5 Co0.8 Fe0.2 O3-δ (BSCF) via phosphorous (P) incorporation, the hydrogen evolution reaction (HER) activity was boosted. Such P incorporation was realized through the lattice doping via an in situ method, or bulk/surface co-modification via an ex situ approach. Under optimal conditions, the derived P-doped and bulk/surface-modified BSCF exhibited η 0 of ~205 and ~159 mV, and η 10 of ~333 and ~309 mV in 1.0 M KOH, respectively. Such attractive performance resulted from multiple aspects, including the improved electrochemical active surface area, accelerated charge transfer kinetics, increased high-oxidation state of the Co cation within the Co 3+ /Co 4+ redox couple, and enlarged amount of lattice oxygen species. Moreover, the presence of amorphous regions and structure distortion of P-modified BSCF from the ex situ method greatly facilitated the HER. Graphical abstract: Image 1 Highlights: Efficient perovskite electrocatalysts were developed for HER. P-modified BSCF were prepared in situ and ex situ. P-modified BSCF exhibited η 0 of ~159 mV and η 10 of ~309 mV. The greatly facilitated HER originates from multiple factors.