Chaitoglou Stefanos, Ma Yang, Ospina Rogelio, Farid Ghulam, Serafin Jarosław, Amade Rovira Roger, Bertran-Serra Enric
Department of Applied Physics, University of Barcelona, C/Martí i Franquès, 1, 08028 Barcelona, Catalunya, Spain.
ENPHOCAMAT Group, Institute of Nanoscience and Nanotechnology (IN2UB), University of Barcelona, C/Martí i Franquès, 1, 08028 Barcelona, Catalunya, Spain.
ACS Appl Nano Mater. 2024 Sep 25;7(19):22631-22639. doi: 10.1021/acsanm.4c03320. eCollection 2024 Oct 11.
Efficient and affordable electrocatalysts are fundamental for the sustainable production of hydrogen from water electrolysis. Here, an approach for the rapid production of laser-induced vertical graphene nanosheets (LIVGNs) through the exfoliation of the graphite foil under laser irradiation is presented. The density of the formed LIVGNs is ∼3 per 100 μm. On leveraging the inherent flexibility and conductivity of the graphite foil substrate, the resulting LIVGNs exhibit a 2.2-fold increase in capacitance, making them promising candidates for electrode applications. The laser-induced surface reconstruction introduces abundant sharp edges to the LIVGNs, enhancing their electrocatalytic potential for hydrogen evolution. In electrocatalytic hydrogen evolution tests in acidic media, the LIVGNs demonstrate superior performance with a remarkable decrease in the required overpotential at 10 mA cm, from -555 mV for the pristine graphite foil to -348 mV for LIVGNs. This improvement is attributed to the active sites provided by the sharp edges, facilitating hydrogen species adsorption. Furthermore, the hydrophilic behavior of LIVGNs is enhanced through the anchoring of oxygen-containing groups, promoting the rapid release of the produced hydrogen bubbles. Importantly, the modified LIVGN electrode exhibits long-term stability across a wide range of current densities during chronoamperometry tests. This research introduces a transformative strategy for the efficient preparation of vertical graphene sheets on conductive graphite foils, showcasing their potential applications in electrocatalysis and energy storage.
高效且经济实惠的电催化剂对于通过水电解可持续制氢至关重要。在此，我们提出了一种通过在激光照射下对石墨箔进行剥离来快速制备激光诱导垂直石墨烯纳米片（LIVGNs）的方法。所形成的LIVGNs的密度约为每100μm有3个。利用石墨箔基底固有的柔韧性和导电性，所得的LIVGNs的电容增加了2.2倍，使其成为电极应用的有前途的候选材料。激光诱导的表面重构为LIVGNs引入了大量尖锐边缘，增强了它们析氢的电催化潜力。在酸性介质中的电催化析氢测试中，LIVGNs表现出优异的性能，在10 mA cm时所需的过电位显著降低，从原始石墨箔的-555 mV降至LIVGNs的-348 mV。这种改善归因于尖锐边缘提供的活性位点，促进了氢物种的吸附。此外，通过锚定含氧基团增强了LIVGNs的亲水性，促进了产生的氢气泡的快速释放。重要的是，在计时电流法测试中，改性的LIVGN电极在很宽的电流密度范围内都表现出长期稳定性。这项研究为在导电石墨箔上高效制备垂直石墨烯片引入了一种变革性策略，展示了它们在电催化和能量存储中的潜在应用。
