Boosting oxygen evolution reaction by activation of lattice‐oxygen sites in layered Ruddlesden‐Popper oxide. Issue 2 (25th March 2020)

• Record Type: Journal Article
• Authors: Zhu, Yinlong; Tahini, Hassan A.; Hu, Zhiwei; Yin, Yichun; Lin, Qian; Sun, Hainan; Zhong, Yijun; Chen, Yubo; Zhang, Feifei; Lin, Hong‐Ji; Chen, Chien‐Te; Zhou, Wei; Zhang, Xiwang; Smith, Sean C.; Shao, Zongping; Wang, Huanting
• Is Part Of: EcoMat. Volume 2:Issue 2(2020)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2020-03-25
• Subjects: anion activation -- lattice‐oxygen sites -- oxygen evolution reaction -- Ruddlesden‐Popper oxide -- structure engineering; Materials -- Environmental aspects -- Periodicals; Clean energy -- Periodicals; 621.042
• DOI: 10.1002/eom2.12021
• Languages: English
• ISSNs: 2567-3173

Abstract

Abstract: Emerging anionic redox chemistry presents new opportunities for enhancing oxygen evolution reaction (OER) activity considering that lattice‐oxygen oxidation mechanism (LOM) could bypass thermodynamic limitation of conventional metal‐ion participation mechanism. Thus, finding an effective method to activate lattice‐oxygen in metal oxides is highly attractive for designing efficient OER electrocatalysts. Here, we discover that the lattice‐oxygen sites in Ruddlesden‐Popper (RP) crystal structure can be activated, leading to a new class of extremely active OER catalyst. As a proof‐of‐concept, the RP Sr3 (Co0.8 Fe0.1 Nb0.1 )2 O7‐δ (RP‐SCFN) oxide exhibits outstanding OER activity (eg, 334 mV at 10 mA cm −2 in 0.1 M KOH), which is significantly higher than that of the simple SrCo0.8 Fe0.1 Nb0.1 O3‐δ perovskite and benchmark RuO2 . Combined density functional theory and X‐ray absorption spectroscopy studies demonstrate that RP‐SCFN follows the LOM under OER condition, and the activated lattice oxygen sites triggered by high covalency of metal‐oxygen bonds are the origin of the high catalytic activity. Abstract : The lattice‐oxygen sites in Ruddlesden‐Popper (RP) crystal structure are first discovered to be activated for ultrafast oxygen evolution. The proof‐of‐concept RP Sr3 (Co0.8 Fe0.1 Nb0.1 )2 O7‐δ oxide exhibits outstanding oxygen evolution reaction activity with an extremely low overpotential of 334 mV at 10 mA cm −2 in 0.1 M KOH, outperforming the benchmark noble‐metal RuO2 and most state‐of‐the‐art oxide‐based catalysts reported to date.