In:
Advanced Materials, Wiley
Abstract:
The development of facile methods for constructing highly active, cost‐effective catalysts that meet ampere‐level current density and durability requirements for an oxygen evolution reaction is crucial. Herein, we posit a general topochemical transformation strategy: the M‐Co 9 S 8 single atom catalysts (SACs) are directly converted into M‐CoOOH‐TT (M = W, Mo, Mn, V) pair sites catalysts under the role of incorporating of atomically dispersed high valence metals modulators through potential cycling. Furthermore, in situ X‐ray absorption fine structure spectroscopy was used to track the dynamic topochemical transformation process at the atomic level. The W‐Co 9 S 8 breaks through the low overpotential of 160 mV at 10 mA cm −2 . A series of pair‐site catalysts exhibit a large current density approaching 1,760 mA cm −2 at 1.68 V versus RHE in alkaline water oxidation and achieve a ∼240‐fold enhancement in the normalized intrinsic activity compared to that reported CoOOH, and sustainable stability of 1,000 h. Moreover, we confirmed the O–O bond formation via a two‐site mechanism, supported by in situ synchrotron radiation infrared and DFT simulations, which breaks the limit of adsorption–energy scaling relationship on conventional single‐site. This article is protected by copyright. All rights reserved
Type of Medium:
Online Resource
ISSN:
0935-9648
,
1521-4095
DOI:
10.1002/adma.202302642
Language:
English
Publisher:
Wiley
Publication Date:
2023
detail.hit.zdb_id:
1474949-X
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