HER activity of MNi1- (M = Cr, Mo and W; x ≈ 0.2) alloy in acid and alkaline media

Jiang, Lili; Ji, Shen-Jing; Han, Xue; Suen, Nian-Tzu

doi:10.1016/j.ijhydene.2020.04.242

Cited by 24 publications

(17 citation statements)

References 33 publications

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“…Noted that the ΔGH ad on the surface of electrocatalyst is pivotal in both acid and alkaline media but the detail is slightly different (with the influence of OH or not) [6] . In our recent report of M x Ni 1‐x ( M =Cr, Mo and W) series, we have demonstrated that the neighboring adsorbed OH molecule on catalytic surface will influence the ΔGH ad substantially and rationalize the trend of HER activity of M x Ni 1‐x ( M =Cr, Mo and W) series in acid and alkaline media [7] …”

Section: Figuresupporting

confidence: 52%

Electrocatalytic Hydrogen Evolution Reaction of Rhenium Metal and Rhenium‐Based Intermetallic in Acid and Alkaline Media

Suen

2021

Eur J Inorg Chem

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Rhenium (Re) metal has been well known for the high corrosion resistance in strong acid and alkaline electrolyte, which makes it a potential electrocatalyst toward hydrogen evolution reaction (HER). However, the low HER activity (>100 mV @ 10 mA/cm2) is a fatal flaw and the reason Re metal does not receive much attention comparing to other noble metal such as Platinum (Pt), Iridium (Ir) and Ruthenium (Ru). To improve the HER activity of Re metal, in this work, we have incorporated a small amount of Zr atoms into Re lattice to form Re based intermetallic Zr5Re24. The large Zr atoms can expand the subunits of the structure and increase the Re−Re bond lengths while the low electronegativity of Zr atoms will donate electrons to Re atoms and fill more antibonding state of Re−Re bond. Both crystal‐structural and electronic‐structural factors will reduce the bond strength of Re−Re bond and thus weaken the corresponding hydrogen adsorption energy (ΔGHad). This can adjust the ΔGHad of Zr5Re24 to an optimal position and enhance the HER activity from Re metal (η10∼125 mV) to Zr5Re24 (η10∼90 mV). Moreover, it was realized that OH molecule on the surface of Zr5Re24 and Re metal will not occupy the most active site (i. e. poison effect) nor significantly influence the ΔGHad to the optimized position (i. e. 0 eV), which well elucidate the similar HER activity in acid or alkaline electrolyte.

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Section: Figuresupporting

confidence: 52%

Electrocatalytic Hydrogen Evolution Reaction of Rhenium Metal and Rhenium‐Based Intermetallic in Acid and Alkaline Media

Suen

2021

Eur J Inorg Chem

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“…2,3 A platinum-based catalyst is considered as a valid HER catalyst, but its scarce reserves and high price directly restrict its commercial applications. 1,4 As a result, searching and developing of rich reserves and stable non-precious metal catalysts have been deemed as the focus of scientific research.…”

Section: Introductionmentioning

confidence: 99%

Ru doped molybdenum-based nanowire arrays for efficient hydrogen evolution over a broad pH range

Yang

Duan-lin

et al. 2022

Dalton Trans.

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“…As inspired by the unique anti-corrosion property of chromium alloy and the applications as cathodes in the alkaline water electrolyzers, Cr is selected as the dopant for the construction of efficient TMPs HER catalysts according to the following considerations: 1) relatively low electronegativity of Cr weakens the bonding strength between H and TMPs; 2) high oxophilicity and the possible high valence prevent TMPs hosts from oxidation; 3) strong siderophile capacity makes the incorporation facile. Cr-doping has been proven to be a valid strategy for the construction of high-active HER catalysts in alkaline medium, [35][36][37] but has yet to be explored for the acidic HER. The nanorod array structure was beneficial for the removal of the generated H 2 on the electrode, with the advantages in mass transfer.…”

Section: Introductionmentioning

confidence: 99%

Cr‐Doped CoP Nanorod Arrays as High‐Performance Hydrogen Evolution Reaction Catalysts at High Current Density

Zhang

Fang

et al. 2021

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Developing highly efficient, low‐cost electrocatalysts with long‐time stability at high current density working conditions for hydrogen evolution reaction (HER) remains a great challenge for the large‐scale commercialization of hydrogen production from water electrolysis. Herein, the Cr‐doped CoP nanorod arrays on carbon cloth (Cr‐CoP‐NR/CC) is reported as high performance HER catalysts with overpotentials of 38 and 209 mV at the HER current densities of 10 and 500 mA cm−2, respectively, outperforming the performance of the commercial Pt/C at high current density. And its HER performance shows almost no loss after 20 h working at 500 mA cm−2. The high performance is attributed to the Cr doping, which optimizes the hydrogen binding energy of CoP and prevents its oxidation. The nanorod array structure helps the escaping of the generated hydrogen gas, which is suitable for working at high current density. The obtained Cr‐CoP‐NR/CC catalyst shows the potential to replace the costly Pt‐based HER catalysts in the water electrolyzer.

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HER activity of MNi1- (M = Cr, Mo and W; x ≈ 0.2) alloy in acid and alkaline media

Cited by 24 publications

References 33 publications

Electrocatalytic Hydrogen Evolution Reaction of Rhenium Metal and Rhenium‐Based Intermetallic in Acid and Alkaline Media

Electrocatalytic Hydrogen Evolution Reaction of Rhenium Metal and Rhenium‐Based Intermetallic in Acid and Alkaline Media

Ru doped molybdenum-based nanowire arrays for efficient hydrogen evolution over a broad pH range

Cr‐Doped CoP Nanorod Arrays as High‐Performance Hydrogen Evolution Reaction Catalysts at High Current Density

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