The traditional Pb-Ag anodes used in zinc electrowinning exhibit high overpotential for oxygen evolution reaction (OER) and poor mechanical strength, leading to high energy consumption. To overcome the shortcomings, Ti/SnO₂-Sb₂O₄/PbO₂-La-doped MnCo₂O_4.5 composite anode was prepared by this work. It demonstrated enhanced electrochemical performance, requiring 565 mV to reach the benchmark current density of 50 mA cm⁻², and the Tafel slop of 179.79 mV dec^–1 in the acidic media containing 50 g L^–1 Zn²⁺ and 150 g L^–1 H₂SO₄. According to the results of XPS, the content of Mn⁴⁺ and Co³⁺ increased, which was beneficial to promote the OER catalytic activity of the electrode. The current efficiency was improved by 1.7 % compared with traditional Pb-0.76 % Ag anode, resulting in a significant reduction in energy consumption of 477.46 kW∙h for producing one ton of zinc. Moreover, the Ti/SnO₂-Sb₂O₄/PbO₂-La-doped MnCo₂O_4.5 anode showed excellent corrosion resistance, and the accelerated service time was extended to 50 h at 2 A cm⁻². The service life of the electrode was extended thanks to the introduction of the intermediate layer and La-doped MnCo₂O_4.5 powder. Therefore, this work provided a novel strategy to prepare the anodes with enhanced electrochemical performance applied in zinc electrowinning and other aspects.

中文翻译：

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La掺杂MnCo2O4.5改性的Ti/SnO2-Sb2O4/PbO2负极增强锌电解沉积中的电化学性能


锌电解沉积中使用的传统 Pb-Ag 负极表现出较高的析氧反应 （OER） 过电位和较差的机械强度，导致高能耗。为了克服这些缺点，本工作制备了 Ti/SnO_{2-Sb 2}O₄/PbO_2-La掺杂的 MnCo₂O_4.5 复合阳极。它表现出增强的电化学性能，在含有 50 g ^L-1 Zn²⁺ 和 150 g ^L-1 H₂SO 4 的酸性介质中，需要 565 mV 才能达到 50 mA ^cm-2 的基准电流密度，以及 179.79 mV ^dec-1 的塔菲尔斜_率。XPS 结果表明，Mn⁴⁺ 和 Co³⁺ 的含量增加，有利于促进电极的 OER 催化活性。与传统的 Pb-0.76% Ag 负极相比，当前效率提高了 1.7%，从而显著降低了生产一吨锌的能耗 477.46 kW∙h。此外，Ti/SnO_{2-Sb 2}O₄/PbO_2-La掺杂的MnCo₂O_4.5负极表现出优异的耐腐蚀性，在2 A cm⁻²下加速使用时间延长至50 h。由于引入了中间层和 La-doped MnCo₂O_4.5 粉末，电极的使用寿命得以延长。因此，这项工作提供了一种新的策略，可以制备应用于锌电积等方面的具有增强电化学性能的阳极。