用于增强析氢反应的具有原位氧化铜泡沫的纳米图案化Pt基金属玻璃电催化剂
Nano-Patterned Pt-Based Metallic Glass Electrocatalysts with In-Situ Copper Oxide Foam for Enhanced Hydrogen Evolution
AI总结：
本研究探讨纳米图案化Pt基块体金属玻璃在析氢反应中的电催化性能，发现其在1000次循环后过电位和Tafel斜率显著降低，并原位形成CuO/Cu2O泡沫，提出无需铜盐的DHBT电沉积三步机制，为合成金属氧化物泡沫提供新策略。
摘要：
氢气是替代化石燃料的极具前景的能源载体，若使用具有低过电位和长期稳定性的电催化剂，通过析氢反应（HER）制氢是一种环境友好的选择。本研究探讨了具有平坦、微图案化和纳米图案化表面的$\mathrm{Pt_{57.5}Cu_{14.7}Ni_{5.3}P_{22.5}}$块体金属玻璃（BMG）在0.5 M H2SO4中HER的电催化性能。纳米图案化Pt-BMG展现出优异的长期稳定性和自我改善行为，在1000次线性扫描伏安法（LSV）循环后，最终过电位为150 mV，Tafel斜率为42 $\mathrm{mV dec^{-1}}$，分别比首次LSV循环降低了42%和37%。X射线光电子能谱（XPS）和俄歇电子能谱（AES）表明，在1000次LSV循环稳定性测试期间，纳米图案化表面顶部形成了一层CuO/Cu2O泡沫。本文提出了一种三步过程来解释CuxO泡沫的形成，即通过动态氢气泡模板（DHBT）电沉积，利用Pt-BMG中铜的溶解，无需使用铜盐。本研究提供了一种制备CuxO泡沫的方法，可用于多种应用。此外，结合DHBT沉积的纳米图案化BMG为合成金属或金属氧化物泡沫提供了可行策略。
英文摘要：
Hydrogen is a promising energy carrier for replacing fossil fuels, and hydrogen production via hydrogen evolution reaction (HER) is an environmentally friendly option if electrocatalysts with low overpotentials and long-term stability are used. In this work, the electrocatalytic performance of $\mathrm{Pt_{57.5}Cu_{14.7}Ni_{5.3}P_{22.5}}$ bulk metallic glass (BMG) with flat, micro-patterned, and nano-patterned surfaces for HER in 0.5 M H2SO4 is studied. The nano-patterned Pt-BMG demonstrates outstanding long-term stability and self-improving behavior with a final overpotential of 150 mV and a Tafel slope of 42 $\mathrm{mV dec^{-1}}$ after 1000 linear sweep voltammetry (LSV) cycles, which is respectively 42% and 37% lower than in the first LSV cycle. X-ray photoelectron spectroscopy (XPS) and Auger electron spectroscopy (AES) indicate the formation of a layer of CuO/Cu2O foam deposited on top of the nano-patterned surface during the stability test of 1000 LSV cycles. A three-step process is proposed to explain the formation of CuxO foam via dynamic hydrogen bubble templating (DHBT) electrodeposition from Cu dissolution of the Pt-BMG without using copper salt. This work provides a method to create CuxO foams that could be used for various applications. Moreover, nano-patterned BMGs with DHBT deposition offer a feasible strategy to synthesize metal or metal-oxide foams.
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