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Zhong, J. Hydrogen Evolution Reaction (HER). Encyclopedia. Available online: https://encyclopedia.pub/entry/60556 (accessed on 24 October 2026).
Zhong J. Hydrogen Evolution Reaction (HER). Encyclopedia. Available at: https://encyclopedia.pub/entry/60556. Accessed October 24, 2026.
Zhong, Jack. "Hydrogen Evolution Reaction (HER)" Encyclopedia, https://encyclopedia.pub/entry/60556 (accessed October 24, 2026).
Zhong, J. (2026, September 28). Hydrogen Evolution Reaction (HER). In Encyclopedia. https://encyclopedia.pub/entry/60556
Zhong, Jack. "Hydrogen Evolution Reaction (HER)." Encyclopedia. Web. 28 September, 2026.

Hydrogen Evolution Reaction (HER)

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Hydrogen evolution reaction (HER) is the cathodic half-reaction in which protons or water are reduced to molecular hydrogen at an electrode. On platinum the exchange current is high and the overpotential small; the search for cheaper catalysts therefore concentrates on earth-abundant transition metals and their compounds, and bifunctional materials that also drive the oxygen evolution reaction simplify the overall device [1]. Two-dimensional transition metal carbides and nitrides have been examined as a class with a tunable surface and metallic conductivity [2]. Nickel chalcogenides, nickel selenide among them, reach appreciable activity in alkaline media [3]. Which phase is actually present under operation is not always the one that was synthesised, and in situ and operando measurements on nickel-based catalysts have shown the near-surface region reconstructing under cathodic bias [4]. Doping a metal phosphide with a second cation modifies the electronic structure and the hydrogen binding energy together, which is how samarium-doped nickel phosphide is understood [5].

electrocatalyst overpotential volmer step hydrogen binding energy alkaline electrolysis water splitting earth-abundant metal
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References

  1. Jamesh, M.I. Recent progress on earth abundant hydrogen evolution reaction and oxygen evolution reaction bifunctional electrocatalyst for overall water splitting in alkaline media. Journal of Power Sources 2016, 333, 213-236. [CrossRef]
  2. Zhang, X.; Verma, R.; Bofang, H.; Verma, S.K.; Haiqiang, B.; Madhusudan, P. MXene-based electrocatalyst for the hydrogen evolution reaction: Innovations and advances – A review. International Journal of Hydrogen Energy 2026, 267, 157036. [CrossRef]
  3. Bhat, K.S.; Nagaraja, H. Nickel selenide nanostructures as an electrocatalyst for hydrogen evolution reaction. International Journal of Hydrogen Energy 2018, 43, 19851-19863. [CrossRef]
  4. Kenry; Liu, B. When In Situ Techniques Meet Nickel-Based Electrocatalyst in Hydrogen Evolution Reaction. Chem 2017, 3, 19-21. [CrossRef]
  5. Shahroudi, A.; Habibzadeh, S. Enhanced hydrogen evolution reaction activity through samarium-doped nickel phosphide (Ni2P) electrocatalyst. Scientific Reports 2024, 14, 16818. [CrossRef]
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Subjects: Green & Sustainable Science & Technology
Contributor MDPI registered users' name will be linked to their SciProfiles pages. To register with us, please refer to https://encyclopedia.pub/register : Jack Zhong
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Update Date: 28 Sep 2026
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