High-efficiency Recovery of Palladium and Platinum using Black Phosphorus for In-Situ Synthesis of Long-term Stable Hydrogen Evolution Catalysts
High-efficiency Recovery of Palladium and Platinum using Black Phosphorus for In-Situ Synthesis of Long-term Stable Hydrogen Evolution Catalysts
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DOI：
10.1016/j.seppur.2023.123771
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发表时间：
2023-04
影响因子：
8.6
通讯作者：
Rui Gao;Xin Wang;Xue Zhang;Shumeng Zhang;Xinxin Li;Xue‐Feng Yu;Lichen Bai
中科院分区：
文献类型：
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作者：
Rui Gao;Xin Wang;Xue Zhang;Shumeng Zhang;Xinxin Li;Xue‐Feng Yu;Lichen Bai
钯(Pd)和铂(Pt)的储量稀缺，需要进行复杂的加工。在本研究中，建立了从废催化剂中回收钯和铂的三段黑磷回收工艺，为解决贵金属危机提供了一种很有前途的策略。经过两个阶段后，Pd的回收率为99.36%±0.08%，总回收能力为1426.11±1.73mgPd g−1BP，是最新技术的90倍。经过第三阶段(45℃，30min)，铂(II)的总回收率为98.62%(467.91 mg铂g−1个基点)。此外，在第二阶段(Pd：Pt=1：1)和第三阶段(Pd：Pt：−=1：11)产生的催化剂中，第一阶段(重量比：Pd：Pt=54.9：1)产生的最佳催化剂的电流密度最高(57.61mA/cm Rhe；过电势=0.70 mV vs.Rhe)。第一阶段生成的Pd/Pt-BP进一步实现了225h(10 mA/cm−2)的显著长期稳定性，并表现出最大的耐久性：2400h。由于BP对金属的能力降低和活化，固定化的Pd(II)和Pt(II)被回收并直接转化为长期稳定的析氢催化剂，而不需要复杂的处理。
The reserves of palladium (Pd) and platinum (Pt) are scarce and require sophisticated processing. Herein, a three-stage recovery process with black phosphorus (BP) is established in this study to recover Pd and Pt from spent catalysts, presenting a promising strategy for addressing the precious metals crisis. The recovery efficiency of Pd is 99.36 % ± 0.08 % after two stages, with a total recovery capacity of 1426.11 ± 1.73 mg Pd g−1BP, which is 90 times higher than that of the latest technologies. The overall recovery efficiency of Pt (II) is 98.62 % (467.91 mg Pt g−1BP) after the third stage (45 °C, 30 min). Furthermore, the current density of the optimal catalysts generated in the first stage (weight ratio: Pd:Pt = 4.9:1) is the highest (57.61 mA cm−1; overpotential = 70 mV vs. RHE) among the catalysts generated in the second (Pd:Pt = 1:1) and third (Pd:Pt = 1:11) stages. Pd/Pt–BP generated in the first stage further achieved remarkable long-term stability of 225 h (10 mA cm−2) and exhibited maximum durability of > 400 h. Owing to the reduced capability and activation of BP to metals, immobilized Pd (II) and Pt (II) are recovered and directly converted to long-term stable hydrogen evolution catalysts without complex processing.