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Key activity descriptors of nickel-iron oxygen evolution electrocatalysts in the presence of alkali metal cations

Görlin, Mikaela (author)
Uppsala universitet,Stockholms universitet,Fysikum,Uppsala University, Sweden,Stockholm Univ, AlbaNova Univ Ctr, Dept Phys, SE-10691 Stockholm, Sweden.;Uppsala Univ, Angstrom Lab, Dept Chem, Box 538, SE-75121 Uppsala, Sweden.,Strukturkemi
Halldin Stenlid, Joakim (author)
Stockholms universitet,Fysikum,Stockholm Univ, AlbaNova Univ Ctr, Dept Phys, SE-10691 Stockholm, Sweden.
Koroidov, Sergey (author)
Stockholms universitet,Fysikum,Stockholm Univ, AlbaNova Univ Ctr, Dept Phys, SE-10691 Stockholm, Sweden.
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Wang, Hsin-Yi (author)
Stockholms universitet,Fysikum,Stockholm Univ, AlbaNova Univ Ctr, Dept Phys, SE-10691 Stockholm, Sweden.
Boerner, Mia (author)
Stockholms universitet,Fysikum,Stockholm Univ, AlbaNova Univ Ctr, Dept Phys, SE-10691 Stockholm, Sweden.
Shipilin, Mikhail (author)
Stockholms universitet,Fysikum,Stockholm Univ, AlbaNova Univ Ctr, Dept Phys, SE-10691 Stockholm, Sweden.
Kalinko, Aleksandr (author)
Univ Paderborn, Dept Chem, Warburger Str 100, D-33098 Paderborn, Germany.;Univ Paderborn, Ctr Sustainable Syst Design CSSD, Warburger Str 100, D-33098 Paderborn, Germany.;Deutsch Elektronen Synchrotron DESY, Notkestr 85, D-22607 Hamburg, Germany.
Murzin, Vadim (author)
Deutsch Elektronen Synchrotron DESY, Notkestr 85, D-22607 Hamburg, Germany.;Berg Univ Wuppertal, Gaussstr 20, D-42119 Wuppertal, Germany.
Safonova, Olga V. (author)
Paul Scherrer Inst, CH-5232 Villigen, Switzerland.
Nachtegaal, Maarten (author)
Paul Scherrer Inst, CH-5232 Villigen, Switzerland.
Uheida, Abdusalam (author)
KTH,Tillämpad fysik,KTH Royal Inst Technol, Sch Engn Sci, Dept Appl Phys, Funct Mat, Alfvens Vag 12, SE-11419 Stockholm, Sweden.
Dutta, Joydeep, Professor, 1964- (author)
KTH,Tillämpad fysik,KTH Royal Inst Technol, Sch Engn Sci, Dept Appl Phys, Funct Mat, Alfvens Vag 12, SE-11419 Stockholm, Sweden.
Bauer, Matthias (author)
Nilsson, Anders (author)
Stockholms universitet,Fysikum,Stockholm Univ, AlbaNova Univ Ctr, Dept Phys, SE-10691 Stockholm, Sweden.
Diaz-Morales, Oscar (author)
Stockholms universitet,KTH,Tillämpad elektrokemi,Stockholm Univ, AlbaNova Univ Ctr, Dept Phys, SE-10691 Stockholm, Sweden.;KTH Royal Inst Technol, Sch Chem Sci & Engn, Appl Electrochem, SE-10044 Stockholm, Sweden.,Fysikum,KTH Royal Institute of Technology, Sweden
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 (creator_code:org_t)
2020-12-02
2020
English.
In: Nature Communications. - : Springer Nature. - 2041-1723. ; 11:1
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  • Journal article (peer-reviewed)
Abstract Subject headings
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  • Efficient oxygen evolution reaction (OER) electrocatalysts are pivotal for sustainable fuel production, where the Ni-Fe oxyhydroxide (OOH) is among the most active catalysts for alkaline OER. Electrolyte alkali metal cations have been shown to modify the activity and reaction intermediates, however, the exact mechanism is at question due to unexplained deviations from the cation size trend. Our X-ray absorption spectroelectrochemical results show that bigger cations shift the Ni2+/(3+delta)+ redox peak and OER activity to lower potentials (however, with typical discrepancies), following the order CsOH>NaOH approximate to KOH>RbOH>LiOH. Here, we find that the OER activity follows the variations in electrolyte pH rather than a specific cation, which accounts for differences both in basicity of the alkali hydroxides and other contributing anomalies. Our density functional theory-derived reactivity descriptors confirm that cations impose negligible effect on the Lewis acidity of Ni, Fe, and O lattice sites, thus strengthening the conclusions of an indirect pH effect. It is commonly accepted that electrolyte alkali metal cations modify the catalytic activity for oxygen evolution reaction. Here the authors challenge this assumption, showing that the activity is actually affected by a change in the electrolyte pH rather than a specific alkali cation.

Subject headings

NATURVETENSKAP  -- Kemi (hsv//swe)
NATURAL SCIENCES  -- Chemical Sciences (hsv//eng)
NATURVETENSKAP  -- Kemi -- Fysikalisk kemi (hsv//swe)
NATURAL SCIENCES  -- Chemical Sciences -- Physical Chemistry (hsv//eng)
NATURVETENSKAP  -- Kemi -- Materialkemi (hsv//swe)
NATURAL SCIENCES  -- Chemical Sciences -- Materials Chemistry (hsv//eng)

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