The development of active single-atom catalysts for the alkaline hydrogen evolution reaction (HER) offers a promising strategy for lowering the cost of green hydrogen. Pt single atoms were in-situ anchored on layered double hydroxide (CoFeLDH) nanosheets using CV scanning electrodeposition with an optimal 40 cycles. The HAADF-STEM analysis confirmed the monoatomic dispersion of Pt in the CoFeLDH-Pt40cls catalyst, whereas XAFS showed that Pt was coordinated with four oxygens. Density functional theory calculation revealed a drop in the reaction energy barrier of the rate-limiting Volmer step during water splitting over the CoFeLDH-Pt40cls catalyst from 2.28 to 1.78 eV. Additionally, the free energy for hydrogen desorption decreased from 1.52 to −0.02 eV. The CoFeLDH-Pt40cls catalyst demonstrated excellent HER kinetics by achieving a −10 mA/cm2 current density at 45 mV overpotential. It also exhibited sustained high activity for around 100 h in stability studies.

中文翻译：

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Pt 单原子原位锚定在 CoFeLDH 上，用于高效析碱性氢反应


用于碱性析氢反应 （HER） 的活性单原子催化剂的开发为降低绿色氢的成本提供了一种有前途的策略。Pt 单原子使用 CV 扫描电沉积原位锚定在层状双氢氧化物 （CoFeLDH） 纳米片上，具有最佳的 40 次循环。HAADF-STEM 分析证实了 Pt 在 CoFeLDH-Pt40cls 催化剂中的单原子分散，而 XAFS 显示 Pt 与四种氧配位。密度泛函理论计算显示，在 CoFeLDH-Pt40cls 催化剂上分解水期间，限速 Volmer 步骤的反应能垒从 2.28 eV 下降到 1.78 eV。此外，氢解吸的自由能从 1.52 eV 降低到 -0.02 eV。CoFeLDH-Pt40cls 催化剂在 45 mV 过电位下实现了 −10 mA/cm2 的电流密度，表现出优异的 HER 动力学。在稳定性研究中，它还表现出约 100 小时的持续高活性。