The electrocatalytic of 5-hydroxymethylfurfural oxidation reaction (HMFOR) is an alternative route for the green production of valuable oxygenated chemicals. Nickel hydroxides, which consist of hydroxide layers and interlayer charge-balancing anions, are a type of promising catalysts for HMFOR. Progresses have been made on elucidating the correlation between the hydroxide layer and HMFOR performance, while the effect of intercalated anions on the activity remains unclear. Herein, two self-supported nickel hydroxide catalysts (i.e., pristine Ni(OH)2/CP-F and deintercalated Ni(OH)2/CP-A) are employed for revealing the relationship between anion-deintercalation and HMFOR activity. Physical characterizations demonstrate that the deintercalation phenomenon can alter the d-band center and increase the electron density of the Ni site. This endows the deintercalated Ni(OH)2/CP-A with improved electrochemical properties (conversion = 99.99 %; FDCA yield > 99 %; FE > 99 %), enhanced adsorption strength for HMF, and increased intrinsic activity, compared to the pristine Ni(OH)2/CP-F. This work not only reports an excellent HMFOR electrocatalyst, but also manifests the crucial effect of deintercalation on the electrochemical oxidation performance of Ni(OH)2.

中文翻译：

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通过脱嵌促进氢氧化镍上 5-羟甲基糠醛的电氧化


5-羟甲基糠醛氧化反应 （HMFOR） 的电催化是绿色生产有价值的含氧化学品的替代途径。氢氧化镍由氢氧化物层和层间电荷平衡阴离子组成，是一种很有前途的 HMFOR 催化剂。在阐明氢氧化物层与 HMFOR 性能之间的相关性方面已经取得了进展，而插层阴离子对活性的影响仍不清楚。本文采用两种自支撑氢氧化镍催化剂（即原始 Ni（OH）2/CP-F 和脱嵌 Ni（OH）2/CP-A）来揭示阴离子脱嵌与 HMFOR 活性之间的关系。物理表征表明，脱嵌现象可以改变 d 带中心并增加 Ni 位点的电子密度。这使脱嵌的 Ni（OH）2/CP-A 具有更好的电化学性能（转化率 = 99.99 %;FDCA 产量 > 99 %;FE > 99 %），与原始 Ni（OH）2/CP-F 相比，HMF 的吸附强度更高，内禀活性更高。这项工作不仅报道了一种优良的 HMFOR 电催化剂，还展示了脱嵌对 Ni（OH）2 电化学氧化性能的关键影响。