Open AccessElectrochemical trapping of metastable Mn 3+ ions for activation of MnO 2 oxygen evolution catalysts
Author(s) -
Zamyla Morgan Chan,
Daniil A. Kitchaev,
Johanelson Weker,
Christoph Schnedermann,
Kipil Lim,
Gerbrand Ceder,
William Tumas,
Michael F. Toney,
Daniel G. Nocera
Publication year - 2018
Publication title -
proceedings of the national academy of sciences
Language(s) - English
Resource type - Journals
eISSN - 1091-6490
pISSN - 0027-8424
DOI - 10.1073/pnas.1722235115
Subject(s) - homo/lumo , oxygen evolution , extended x ray absorption fine structure , chemistry , manganese , catalysis , electrochemistry , raman spectroscopy , comproportionation , absorption spectroscopy , xanes , crystallography , inorganic chemistry , photochemistry , spectral line , molecule , electrode , optics , astronomy , physics , quantum mechanics , biochemistry , organic chemistry
Significance Manganese oxide films are desirable oxygen evolution reaction (OER) catalysts due to their stability in acidic solutions and viability as earth-abundant materials. Enhanced catalytic activity of MnO2 incorporated with Mn3+ provides an imperative for understanding the structural and electronic effects giving rise to the superior OER catalysis. We show that (i ) Mn3+ is stabilized kinetically in tetrahedral sites and (ii ) its presence strains the oxide lattice, leading to a favorable disposition of oxide-based vs. metal-based energy levels that favors enhanced OER activity. The results herein offer a design concept of exploiting ion-induced lattice strain for creating superior metal oxide OER catalysts.
Accelerating Research
Robert Robinson Avenue,
Oxford Science Park, Oxford
OX4 4GP, United Kingdom
Address
John Eccles HouseRobert Robinson Avenue,
Oxford Science Park, Oxford
OX4 4GP, United Kingdom