The fabrication of alkoxysilane-based nickel (Ni)–palladium (Pd) bimetallic nanoparticle catalysts with several compositions (Pd—0.001M and Ni—0.001–0.1M) was attempted for the first time; these materials were investigated for use as low-cost catalysts in the hydrogen evolution reaction (HER). Functional alkoxysilane [2-(3,4 epoxycyclohexyl)ethyltrimethoxysilane]-assisted conversion of Pd²⁺ to Pd⁰ was demonstrated. Palladium nanocrystallites with an average dimension 4.03 ± 1.29 nm were synthesized, which acted as seeds in the synthesis of Ni–Pd bimetallic nanoparticles. The effect of the nanoparticle catalysts on the HER in an alkaline environment was studied using linear sweep voltammetry and electrochemical impedance spectroscopy. A nanostructured thin film containing Ni₃PdNPs produced a 100 mA cm⁻² current density at an overpotential of −90 mV with a small Tafel slope of 25 mV dec⁻¹ at a catalyst loading of 0.1 mg cm⁻². The annealed Ni₃PdNPs catalyst further enhanced the current density to ∼ 240 mA cm⁻² at an overpotential of −56 mV.

中文翻译：

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较低贵金属浓度下有机三烷氧基硅烷介导的Ni-Pd纳米催化剂的合成：加快氢释放动力学的催化剂

首次尝试制备具有几种组成（Pd-0.001M和Ni-0.001-0.1M）的烷氧基​​硅烷基镍（Ni）-钯（Pd）双金属纳米颗粒催化剂；对这些材料进行了研究，以用作氢气析出反应（HER）中的低成本催化剂。证实了功能性烷氧基硅烷[2-（3,4-环氧环己基）乙基三甲氧基硅烷]辅助的Pd ²⁺转化为Pd ⁰。合成了平均尺寸为4.03±1.29 nm的钯纳米微晶，它们在合成Ni-Pd双金属纳米颗粒中充当种子。使用线性扫描伏安法和电化学阻抗谱研究了纳米颗粒催化剂对碱性环境中HER的影响。含镍的纳米结构薄膜_3个PdNP在-90 mV的超电势下产生100 mA cm ^-2的电流密度，在0.1 mg cm ^-2的催化剂负载量下Tafel斜率较小，为25 mV dec ^-1。经过退火的Ni ₃ PdNPs催化剂在-56 mV的超电势下将电流密度进一步提高至〜240 mA cm ^-2。