Avoiding Pitfalls in Comparison of Activity and Selectivity of Solid Catalysts for Electrochemical HMF Oxidation,ChemistryOpen

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Avoiding Pitfalls in Comparison of Activity and Selectivity of Solid Catalysts for Electrochemical HMF Oxidation
ChemistryOpen ( IF 2.5 ) Pub Date : 2021-05-24 , DOI: 10.1002/open.202100072
Sebastian Wöllner ₁ , Timothy Nowak ₁ , Gui-Rong Zhang ₁ , Nils Rockstroh ₂ , Hanadi Ghanem ₃ , Stefan Rosiwal ₃ , Angelika Brückner ₂ , Bastian J M Etzold ₁

Affiliation

Electrocatalytic oxidation of 5-hydroxymethylfurfural (HMF) offers a renewable approach to produce the value-added platform chemical 2,5-furandicarboxylic acid (FDCA). The key for the economic viability of this approach is to develop active and selective electrocatalysts. Nevertheless, a reliable catalyst evaluation protocol is still missing, leading to elusive conclusions on criteria for a high-performing catalyst. Herein, we demonstrate that besides the catalyst identity, secondary parameters such as materials of conductive substrates for the working electrode, concentration of the supporting electrolyte, and electrolyzer configurations have profound impact on the catalyst performance and thus need to be optimized before assessing the true activity of a catalyst. Moreover, we highlight the importance of those secondary parameters in suppressing side reactions, which has long been overlooked. The protocol is validated by evaluating the performance of free-standing Cu-foam, and CuCoO modified with NaPO₂H₂ and Ni, which were immobilized on boron-doped diamond (BDD) electrodes. Recommended practices and figure of merits in carefully evaluating the catalyst performance are proposed.

中文翻译：

避免电化学 HMF 氧化固体催化剂活性和选择性比较中的陷阱

5-羟甲基糠醛 (HMF) 的电催化氧化提供了一种可再生方法来生产增值平台化学品 2,5-呋喃二甲酸 (FDCA)。这种方法经济可行性的关键是开发活性和选择性电催化剂。然而，仍然缺乏可靠的催化剂评估方案，导致对高性能催化剂的标准得出难以捉摸的结论。在此，我们证明，除了催化剂特性外，工作电极导电基底材料、支持电解质浓度和电解槽配置等次要参数对催化剂性能也有深远影响，因此在评估真实活性之前需要进行优化的催化剂。此外，我们强调了这些次要参数在抑制副反应方面的重要性，而这一点长期以来一直被忽视。通过评估固定在掺硼金刚石 (BDD) 电极上的独立式铜泡沫和用 NaPO ₂ H ₂和 Ni 改性的 CuCoO 的性能来验证该协议。提出了仔细评估催化剂性能的推荐做法和品质因数。

更新日期：2021-05-25

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