Cost-efficient sunlight-driven thermoelectric electrolysis over Mo-doped Ni5P4 nanosheets for highly efficient alkaline water/seawater splitting

doi:10.1016/j.jmst.2024.05.019

Abstract

Abstract: Thermoelectric water spitting to hydrogen systems has great potential in the production of environment-friendly fuel using renewable solar energy in the future. In this work, we prepared porous nanosheet Mo doping Ni₅P₄ catalysts on nickel foam with efficient hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) performance in alkaline media. Density Functional Theory (DFT) calculations and experimental studies have shown that Mo doping deadeneds the interaction between H and O atomic orbitals of transition state water molecules, effectively weakening the activation energy of H₂O dissociation. Therefore, Mo doping is favorable for enhancing HER activity with overpotential at 10 mA cm^-2 of 93 mV and Tafel slope of 40.1 mV dec^-1 in 1 M KOH. Besides, it exhibits high alkaline OER activity with an ultra-low overpotential of 200 mV at 10 mA cm^-2. Moreover, this catalyst only needs 1.537 V in a dual-electrode configuration of the electrolytic cell, which is much lower than the commercial Pt/C-RuO₂ couple (1.614 V). In addition, we have developed and constructed a solar thermoelectric generator (TEG) that is capable of floating on water. This TEG has a continuous power output and an exceptionally long lifespan, providing a stable power supply to the synthesized catalyst electrolyzer. It can produce a maximum power output of over 90 mW, meeting the requirement of converting solar radiation heat into usable electricity. As a result, the system achieves productivity of 0.11 mL min^-1 H₂. This solar thermal energy conversion technology shows the possibility of large-scale industrial production of H₂ and provides a new idea for exploring heat source utilization.

Key words: Thermoelectric seawater spitting, Ni₅P₄, Mo doping, HER, OER

Peng Gao, Yanping Zhang, Min Wang, Wanfei Yu, Zihao Yan, Jianbao Li. Cost-efficient sunlight-driven thermoelectric electrolysis over Mo-doped Ni₅P₄ nanosheets for highly efficient alkaline water/seawater splitting[J]. J. Mater. Sci. Technol., 2025, 211: 134-144.

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Cost-efficient sunlight-driven thermoelectric electrolysis over Mo-doped Ni₅P₄ nanosheets for highly efficient alkaline water/seawater splitting

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