Triphenylphosphine-Assisted Exsolution Engineering on Ruddlesden–Popper Perovskites for Promoting Oxygen Evolution
Juan Bai , Jing Shang , Jun Mei , Dongchen Qi , Ting Liao , Ziqi Sun
Energy & Environmental Materials ›› 2024, Vol. 7 ›› Issue (4) : e12668
Triphenylphosphine-Assisted Exsolution Engineering on Ruddlesden–Popper Perovskites for Promoting Oxygen Evolution
Metal exsolution engineering has been regarded as a promising strategy for activating intrinsically inert perovskite oxide catalysts toward efficient oxygen evolution reaction. Traditional metal exsolution processes on perovskites are often achieved by using the reducing hydrogen gas; however, this is not effective for the relatively stable phase, such as Ruddlesden–Popper perovskite oxides. To address this issue, triphenylphosphine is proposed to be a reduction promotor for accelerating the reduction and migration of the target metal atoms, aiming to achieve the effective exsolution of metallic species from Ruddlesden–Popper-type parent perovskites. Upon oxygen evolution reaction, these exsolved metallic aggregates are reconstructed into oxyhydroxides as the real active centers. After further modification by low-percentage iridium oxide nanoclusters, the optimal catalyst delivered an overpotential as low as 305 mV for generating the density of 10 mA cm-2, outperforming these reported noble metal-containing perovskite-based alkaline oxygen evolution reaction electrocatalysts. This work provides a potential approach to activate catalytically inert oxides through promoting surface metal exsolution and explores a novel class of Ruddlesden–Popper-type oxides for electrocatalytic applications.
exsolution / oxygen evolution / perovskite / reconstruction / Ruddlesden–Popper
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2023 The Authors. Energy & Environmental Materials published by John Wiley & Sons Australia, Ltd on behalf of Zhengzhou University.
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