NiMoV and NiO-based catalysts for efficient solar-driven water splitting using thermally integrated photovoltaics in a scalable approach

İlknur Bayrak Pehlivan; Johan Oscarsson; Zhen Qiu; Lars Stolt; Marika Edoff; Tomas Edvinsson

doi:10.1016/j.isci.2020.101910

NiMoV and NiO-based catalysts for efficient solar-driven water splitting using thermally integrated photovoltaics in a scalable approach

iScience. 2020 Dec 9;24(1):101910. doi: 10.1016/j.isci.2020.101910. eCollection 2021 Jan 22.

Authors

İlknur Bayrak Pehlivan¹, Johan Oscarsson², Zhen Qiu¹, Lars Stolt², Marika Edoff³, Tomas Edvinsson¹

Affiliations

¹ Department of Materials Science and Engineering, Solid State Physics, Uppsala University, Box 534, 75121 Uppsala, Sweden.
² Solibro Research AB, Vallvägen 5, 75651 Uppsala, Sweden.
³ Department of Materials Science and Engineering, Solid State Electronics, Uppsala University, Box 534, 75121 Uppsala, Sweden.

Abstract

In this work, a trimetallic NiMoV catalyst is developed for the hydrogen evolution reaction and characterized with respect to structure, valence, and elemental distribution. The overpotential to drive a 10 mA cm^-2 current density is lowered from 94 to 78 mV versus reversible hydrogen electrode by introducing V into NiMo. A scalable stand-alone system for solar-driven water splitting was examined for a laboratory-scale device with 1.6 cm² photovoltaic (PV) module area to an up-scaled device with 100 cm² area. The NiMoV cathodic catalyst is combined with a NiO anode in alkaline electrolyzer unit thermally connected to synthesized (Ag,Cu) (In,Ga)Se₂ ((A)CIGS) PV modules. Performance of 3- and 4-cell interconnected PV modules, electrolyzer, and hydrogen production of the PV electrolyzer are examined between 25°C and 50°C. The PV-electrolysis device having a 4-cell (A)CIGS under 100 mW cm^-2 illumination and NiMoV-NiO electrolyzer shows 9.1% maximum and 8.5% averaged efficiency for 100 h operation.

Keywords: Chemistry; Electrochemistry; Energy Materials; Engineering; Materials Science.