This work reports a study of the electrocatalytic properties and stability of nanostructured carbon electrodes by on-line differential electrochemical mass spectrometry (DEMS). A wide electrochemical characterization in 0.1 M NaHCO₃ involving anodic (carbon corrosion and oxygen evolution reaction, OER) and cathodic (CO₂ reduction and hydrogen evolution reaction, HER) key reactions in energy-conversion devices was performed. DEMS studies showed that the faradaic current from 1.3 to 1.6 V vs. RHE of carbons was only associated to CO₂ formation by corrosion and not to OER, the stability being improved by the graphitic character of carbon. H₂ evolution was also enhanced with graphitic carbon nanofilaments, even though metal traces might positively influence their catalytic activity. By comparison of the faradaic currents and the H₂ formation signals, in the absence and presence of CO₂, a high inhibition of the HER was established for all carbon electrodes due to the species adsorption from CO₂ reduction.

这项工作报告了通过在线差分电化学质谱法（DEMS）对纳米结构碳电极的电催化性能和稳定性的研究。在能量转换装置中，在0.1 M NaHCO _{3中进行了}涉及阳极（碳腐蚀和氧生成反应，OER）和阴极（CO ₂还原和氢生成反应，HER）关键反应的广泛电化学表征。DEMS研究表明，相对于碳的RHE，1.3至1.6 V的法拉第电流仅与腐蚀形成的CO ₂有关，而与OER无关，碳的石墨特性提高了稳定性。高₂即使金属痕迹可能会积极影响其催化活性，但石墨碳纳米丝也会促进碳纳米管的演化。通过比较法拉第电流和H ₂形成信号，在不存在和存在CO ₂的情况下，由于CO ₂还原引起的物质吸附，对所有碳电极都建立了对HER的高度抑制。