Details

Autor(en) / Beteiligte

• Wu, Yili
• Zhou, Zixiang
• Yao, Qi
• Wang, Jinlian
• Tian, Yu
• Liu, Shuling
• Wang, Chao

Titel

Electrodeposition nanoarchitectonics of nickel cobalt phosphide films from methyltriphenylphosphonium bromide-ethylene glycol deep eutectic solvent for hydrogen evolution reaction

Ist Teil von

• Journal of alloys and compounds, 2023-05, Vol.942, p.169070, Article 169070

Ort / Verlag

Elsevier B.V

Erscheinungsjahr

2023

Link zum Volltext

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• Active hydrogen evolution electrocatalysts based on earth-abundant elements are essential in the widespread application of water electrolyzers. Nickel cobalt phosphide films (Ni-Co-P) are electrodeposited on to carbon cloth substrates from a methyltriphenylphosphonium bromide-ethylene glycol deep eutectic solvent using the potentiostatic method. The formation of Ni-Co-P follows the diffusion-controlled three-dimensional instantaneous nucleation and growth mechanism, and the deposited Ni-Co-P have rough surface and contain abundant pores. The Ni-Co-P are active towards hydrogen evolution, and the most active film reaches 10 mA cm−2 current densities with an overpotential of 93 mV in 1 M KOH, and with the Tafel slope at 48 mV dec−1. The high electrocatalytic activity is originated from the enhanced intrinsic activity induced by the electron interaction that accelerates the hydrogen adsorption process (Volmer step) at the electrochemically active sites. The Ni-Co-P can stably catalyze the HER. [Display omitted] •Ni-Co-P films are electrodeposited from deep eutectic solvent.•The instantaneous 3D nucleation and growth mechanism is followed.•93 mV overpotential is required to reach 10 mA cm−2 HER current densities.•The electronic effect could account for the observed high intrinsic HER activities.