Oxygen reduction reaction is considered a green and low-carbon approach for H2O2 production. Low space-time yield and high energy consumption are serious challenges to the implementation of a commercial scale now. A cost-efficient H2O2 electrosynthesis using a recycled gold catalyst is developed here. The carbon-supported gold catalyst is synthesized using electroplating gold wastewater, which indicates good catalysis performances for both sulfite oxidation and H2O2 production. The sulfite/air fuel cell adopting the bifunctional gold catalyst can directly produce 8.70±0.53 g L−1 H2O2 in 0.5 mol L−1 Na2SO4 solution, with a good current efficiency of 71.56 %±2.13 % and a remarkable space-time yield of 27.20±1.17 mg cm−2 h−1. Adopting the desulfurization solution from flue gas as the anodic sacrificial agent, the electricity costs for acidic and neutral H2O2 electrosynthesis are only 2.09–3.82 kWh kg−1. The reported H2O2 electrosynthesis performances, especially for power consumption, are also summarized and compared.

中文翻译：

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在酸性和中性溶液中经济高效地电合成过氧化氢


氧还原反应被认为是 H2O2 生产的一种绿色低碳方法。低时空产率和高能耗是目前实现商业规模的严峻挑战。这里开发了一种使用回收金催化剂的具有成本效益的 H2O2 电合成。碳负载金催化剂是使用电镀金废水合成的，这表明在亚硫酸盐氧化和 H2O2 生产方面具有良好的催化性能。采用双功能金催化剂的亚硫酸盐/空气燃料电池可在 0.5 mol L-1 Na2SO4 溶液中直接产生 8.70±0.53 g L-1 H2O2，具有良好的电流效率 71.56 %±2.13 %，时空产率高达 27.20±1.17 mg cm-2 h-1。采用烟气脱硫溶液作为阳极牺牲剂，酸性和中性 H2O2 电合成的电费仅为 2.09–3.82 kWh kg-1。本文还总结和比较了所报道的 H2O2 电合成性能，尤其是功耗性能。