Rational design of efficient electrocatalysts for hydrogen production by water electrolysis at high current density

Abstract

Challenges and design strategies of electrocatalysts for high-current–density water electrolysis.

Design Strategies towards Advanced Hydrogen Evolution Reaction Electrocatalysts at Large Current Densities

“…Suitable morphology engineering of an electrocatalyst, such as nanoarray configuration, or porous structure, can provide abundant channels for electrolyte diffusion, reduce the mass transfer distance, and accelerate the gas bubble detachment, which is desirable for achieving fast mass transfer during HER. [115,116] Jiang and co-workers found that compared to flat MoS 2 film, nanostructured MoS 2 film with a superaerophobic surface can realize rapid removal of small gas bubbles. [117] Since then, surface wettability properties of the catalysts are well tailored to facilitate the mass diffusion.…”

“…[130] Nevertheless, to achieve high stability, both chemical stability and mechanical stability of an electrocatalyst need to be well considered. [115,131] Compared to powder electrocatalysts, which are generally coated on the substrate with the help of polymer binders, the in-situ growth of electrocatalysts on the substrate leads to a strong catalyst-substrate interface, which is beneficial for achieving excellent mechanical stability. Recently, Liu et al reported a dual interfacial engineering strategy to realize the high mechanical stability.…”

Vertically Aligned Amorphous NiCoMoP Nanosheets Inlaid with Crystalline NiCoMoP Nanoparticles for Enhanced Overall Water Splitting

“…Rational modulation of the catalyst morphology not only increases the exposed active sites to enhance the apparent activity but also accelerates the detachment of bubbles, thus improving the mass diffusion. 19 T h i s c o n t e n t i s…”

Nickel-Based Anode Electrocatalysts for Hydrogen Production

“…The optimization strategies for Ni-based catalysts encompass morphological engineering, electronic structure modulation, surface/interface engineering, etc. 20 For example, Yang et al used the magnetic-field-directed deposition strategy to synthesize NiFe alloy nanowire arrays. 21 The nanowire array exhibits an enhanced alkaline OER performance by facilitating electrolyte absorption and promoting the detachment of the O 2 bubble detachment.…”

“…The appropriate modification of the catalyst surface, as the site for electrocatalytic reactions, can profoundly influence the reaction rate, conversion of reactants, and selectivity of products. The optimization strategies for Ni-based catalysts encompass morphological engineering, electronic structure modulation, surface/interface engineering, etc . For example, Yang et al used the magnetic-field-directed deposition strategy to synthesize NiFe alloy nanowire arrays .…”