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Ni-metalloid (B, Si, P, As and Te) alloys as water oxidation electrocatalysts

 
: Masa, Justus; Piontek, Stefan; Wilde, Patrick; Antoni, Hendrik; Eckhard, Till; Chen, Yen-Ting; Muhler, Martin; Apfel, Ulf-Peter; Schuhmann, Wolfgang

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Advanced energy materials 9 (2019), Nr.26, Art. 1900796, 8 S.
ISSN: 1614-6840
ISSN: 1614-6832
Deutsche Forschungsgemeinschaft DFG
390677874; EXC-2033
Germany’s Excellence Strategy
Fraunhofer-Gesellschaft FhG
097–602175; ATTRACT
Englisch
Zeitschriftenaufsatz
Fraunhofer UMSICHT Oberhausen ()
electrocatalysis; nickel arsenide; nickel phosphide; nickel-metalloid alloy; water oxidation

Abstract
Breakthroughs toward effective water‐splitting electrocatalysts for mass hydrogen production will necessitate material design strategies based on unexplored material chemistries. Herein, Ni‐metalloid (B, Si, P, As, Te) alloys are reported as an emergent class of highly promising electrocatalysts for the oxygen evolution reaction (OER) and insight is offered into the origin of activity enhancement on the premise of the surface electronic structure, the OER activation energy, influence of the guest metalloid elements on the lattice structure of the host metal (Ni), and surface‐oxidized metalloid oxoanions. The metalloids modify the lattice structure of Ni, causing changes in the nearest Ni–Ni interatomic distance (dNi–Ni). The activation energy Ea scales with dNi–Ni indicating an apparent dependence of the OER activity on lattice properties. During the OER, surface Ni atoms are oxidized to nickel oxyhydroxide, which is the active state of the catalyst, meanwhile, the surface metalloids are oxidized to the corresponding oxoanions that affect the interfacial electrode/electrolyte properties and hence the adsorption/desorption interaction energies of the reacting species.

: http://publica.fraunhofer.de/dokumente/N-549048.html