Competitive‐Reduction Chemistry on Ni‐Doped FeS₂ Catalyst Reinforcing Acid‐Corrosion Resistance for Stable Hydrogen Evolution Reactions

Abstract

Transition‐metal chalcogenides are promising low‐cost hydrogen evolution reaction (HER) catalysts; however, they suffer from serious electrochemical corrosion in acidic environment. Herein, it is proposed that Ni‐doped FeS2 nanowire arrays (Ni‐FeS2 NWs) fabricated through a simple doping strategy show significantly enhanced antiacid stability during HER process relative to its FeS2 counterpart enabled by a S‐site competitive‐reduction chemistry. Transition‐state energy calculations indicate that Ni‐FeS2 and FeS2 show different HER catalytic active center at S and Fe sites, respectively. For Ni‐FeS2, this means more H+ preferentially adsorb on S sites for enhanced HER which simultaneously suppresses the competitive reduction of acid corrosion of FeS2 occurred at the same S sites. However, for FeS2 the corrosion reaction and HER occurred, respectively, at S and Fe sites are paralleled. Besides, density functional theory calculations also show that the Ni‐FeS2 exhibits the enhanced structural stability during the HER process after Ni2+ doping into FeS2.

Synthesis of Co, Ni-doped MoS 2 as durable and pH-universal catalyst for hydrogen evolution

“…When Co and Ni co-doping is performed, the overpotential is further reduced to 95.6 eV at 10 mA cm −2 . The overpotential is 191.8 eV when the current density reaches 100 mA cm −2 , which is lower than that observed in the majority of previously reported transition metal sulfides [32][33][34][35] . The Tafel slope can be one of the characteristics used to assess the effectiveness of an electrocatalyst, given its inverse relationship with the charge transfer coefficient.…”

MXene composite with Ni/Co sulfide for enhanced hydrogen evolution reaction

“…17 For the HER and OER, for instance, a Ni–FeS 2 lattice on Ni foam results in improved catalytic activity. 18…”

“…17 For the HER and OER, for instance, a Ni-FeS 2 lattice on Ni foam results in improved catalytic activity. 18 The electrocatalytic activity of TMDs can be enhanced by adding a conductive material to them, which leads to variations in the DGH* and the electrical conductivity, as determined using density functional theory (DFT) calculations. 16,19 In this regard, a variety of catalyst supports, such as reduced graphene oxide, 20 multi-walled carbon nanotubes, 21 and other carbonbased materials, 22 have been investigated.…”

Construction of Hierarchical PdAgAu Nanorings/MXene–GO Electrocatalysts for Efficient and Ultrastable Hydrogen Evolution Reaction

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As promising environmental-friendly technique realizes green hydrogen production, hydrogen evolution reaction (HER) has been paid increasing attention. [1,2] However, the sluggish kinetics and high overpotential of HER are strongly restricting the production of H 2 . [3] Recently, substantial efforts have been devoted to developing advanced electrocatalysts with the aim to improve the reaction kinetics in turn to facilitate the HER.

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