Ordered Mesoporous Intermetallic Trimetals for Efficient and pH-Universal Hydrogen Evolution Electrocatalysis,Advanced Energy Materials

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Ordered Mesoporous Intermetallic Trimetals for Efficient and pH-Universal Hydrogen Evolution Electrocatalysis
Advanced Energy Materials ( IF 24.4 ) Pub Date : 2022-06-22 , DOI: 10.1002/aenm.202201478
Yanzhi Wang ₁ , Hao Lv ₁ , Lizhi Sun ₁ , Fengrui Jia ₁ , Ben Liu ₁

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Ordered intermetallic platinum-zinc (I-PtZn) bimetals represent an emerging class of alloy electrocatalysts for water splitting and fuel cell electrocatalysis, but large-scale commercial implementation has still been hindered by their catalytic activity and stability. Here, ordered mesoporous I-PtZn bimetals are selectively substituted with 3d transition/main metals, termed MI-PtZnM trimetals, where M is scandium, vanadium, chromium, manganese, iron, cobalt, nickel, copper, or gallium. It is demonstrated that ordered MI-PtZnCo trimetals exhibit the best electrocatalytic performance for the hydrogen evolution reaction (HER) in an alkaline media, with a high mass activity of 1.77 A mg_pt^–1 and specific activity of 3.07 mA cm_pt^–2. More impressively, this electrocatalyst shows robust electrocatalytic stability with negligible activity decay even after 50 000 cycles. The MI-PtZnCo trimetals are also highly active and stable for HER electrocatalysis over a wide pH range (neutral and acidic media). Mechanistic studies suggest that Co-enabled Pt atoms in MI-PtZn with a more electron-rich surface, in addition to stable mesoporous and intermetallic structure, synergistically accelerate Tafel kinetics and thus enhance HER activity and stability of MI-PtZnCo trimetal electrocatalysts.

中文翻译：

用于高效和通用 pH 电催化析氢的有序介孔金属间化合物三金属

有序金属间化合物铂-锌 (I-PtZn) 双金属代表了一类新兴的用于水分解和燃料电池电催化的合金电催化剂，但其催化活性和稳定性仍然阻碍了大规模商业化实施。在这里，有序介孔 I-PtZn 双金属被 3 d过渡/主要金属选择性取代，称为 MI-PtZnM 三金属，其中 M 是钪、钒、铬、锰、铁、钴、镍、铜或镓。结果表明，有序 MI-PtZnCo 三金属在碱性介质中对析氢反应 (HER) 表现出最佳的电催化性能，质量活性为 1.77 A mg _pt^–1，比活性为 3.07 mA cm _pt^–2. 更令人印象深刻的是，这种电催化剂显示出强大的电催化稳定性，即使在 50 000 次循环后活性衰减也可以忽略不计。MI-PtZnCo 三金属在很宽的 pH 范围（中性和酸性介质）内对 HER 电催化也具有高活性和稳定性。机理研究表明，具有更富电子表面的 MI-PtZn 中的 Co 启用 Pt 原子，除了稳定的介孔和金属间化合物结构外，还能协同加速 Tafel 动力学，从而提高 MI-PtZnCo 三金属电催化剂的 HER 活性和稳定性。

更新日期：2022-06-22

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