题目：

Phase Reconstruction-Directed Synthesis of Oxalate-Functionalized Nickel Hydroxide Electrocatalyst for High-Yield H₂O₂Generation at Industrial Currents

作者：

Zhiwei Liu¹, Weijie Yuan¹, Hongyuan Yang², Zhenhui Kang¹*, Mengjie Ma¹, Prashanth W. Menezes^2,3* & Ziliang Chen^1,3*

单位：

¹Institute of Functional Nano & Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Soochow University, 199 Ren’ai Road, Suzhou, Jiangsu 215123, China.

²Department of Chemistry: Metalorganics and Inorganic Materials Technische Universität Berlin, Straße des 17 Juni 135, Sekr. C2, 10623 Berlin, Germany.

³Material Chemistry Group for Thin Film Catalysis–CatLab Helmholtz-Zentrum Berlin für Materialien und Energie, Albert-Einstein-Str. 15, 12489 Berlin, Germany.

摘要：

The electrochemical oxygen reduction reaction (2e⁻ORR) offers a promising approach for H₂O₂production, yet developing highly active, selective, and stable electrocatalysts remains a challenge. In this work, a phase reconstruction strategy is presented to synthesize an oxalate-adsorbed nickel hydroxide electrocatalyst (Ni(OH)₂-C₂O₄) through the self-dissociation of nickel oxalate in an alkaline medium, leading to a notable enhancement in H₂O₂yield at elevated current densities. Remarkably, Ni(OH)₂-C₂O₄exhibits a 2e⁻selectivity exceeding 93% across a broad voltage range (0.0 to 0.5 V vs. RHE) in 0.1 M KOH, outperforming pristine Ni(OH)₂. When deployed as a gas diffusion electrode in a flow cell, the Ni(OH)₂-C₂O₄catalyst demonstrates stable operation for 50 h at 200 mA cm⁻², with a Faradaic efficiency surpassing 90% and a peak H₂O₂yield of 6.2 mol g⁻¹_cath⁻¹. Comprehensive advanced characterizations, including in situ Raman spectroscopy, transient photovoltage spectra, and transient potential scanning spectra, coupled with post-ORR analyses, reveal that surface-adsorbed oxalate groups on Ni(OH)₂enhance the interfacial reaction kinetics between active Ni sites and reactants by inducing a charge trapping effect and forming a hydrogen-bonded network, facilitating robust and high-yield H₂O₂production.

影响因子：

18.5

分区情况：

一区

链接：

https://doi.org/10.1002/adfm.202412198

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