二维 PdIr₂合金纳米片的合成及碱性电解水析氢性能

Synthesis of Two-dimensional PdIr₂ Alloy Nanosheets for Enhanced Alkaline Hydrogen Evolution Reaction Performance

摘要

近年来， 电化学析氢反应（HER）已成为一种重要的制氢新途径. 在催化剂方面， Pd基材料被认为是替代贵金属Pt基催化剂的最具潜力的候选材料之一. 然而， Pd基催化剂对氢中间体的吸附过强， 制约了其析氢性能的有效发挥. 针对这一问题， 本文采用有机前体降解法制备了二维PdIr₂合金纳米片催化剂. 通过合金化策略调控Pd的电子结构， 从而提升其在碱性介质中的HER性能. 实验结果表明， 所制备的PdIr₂合金纳米片催化剂在 10 mA/cm²电流密度下的过电位仅为 19 mV， Tafel 斜率为 51.4 mV/dec， 性能显著优于商业铂碳（c-Pt/C）和商业钯碳（c-Pd/C）催化剂. 在稳定性方面， 该催化剂在长达136 h内电压衰减仅为63 mV， 平均衰减速率为0.46 mV/h， 且在最后116 h内， 电压衰减在10 mV以内， 显示出优于对比催化剂的稳定性.

Abstract

In recent years, the electrochemical hydrogen evolution reaction（HER） has emerged as a promising approach for sustainable hydrogen production. Among various catalysts, Pd-based materials are regarded as one kind of the most promising alternatives to Pt-based counterparts. However, the excessively strong adsorption of hydrogen intermediates on Pd surfaces limits their HER efficiency. In this study, the two-dimensional PdIr₂ alloy nanosheets was synthesized via an organic-precursor decomposition method. The formation of the alloy structure effectively modulates the electronic configuration of Pd, thereby enhancing its alkaline HER performance. Electrochemical measurements show that the PdIr₂ alloy nanosheet catalyst achieves an overpotential of only 19 mV at a current density of 10 mA/cm² and a Tafel slope of 51.4 mV/dec, significantly outperforming commercial Pt/C and commercial Pd/C catalysts. In addition, the catalyst exhibits excellent long-term stability, with a voltage decay of only 63 mV over 136 h（average decay rate of 0.46 mV/h）. Notably, the decay voltage remains within 10 mV over the final 116 h, demonstrating superior stability compared to the reference catalysts.

关键词

Pd基催化剂 / PdIr合金 / 二维纳米片 / 碱性析氢

Key words

Pd-based catalyst / PdIr Alloy / Two-dimensional nanosheet / Hydrogen evolution reaction（HER） in alkaline

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基金资助

安徽省自然科学基金(JZ2023AKZR0560)

安徽省自然科学基金(JZ2024AKZR0546)