数字农科院2.0

Interfacial Engineering of NiCo Nanocones to Promote NiOOH Formation via Enhanced Dehydrogenation for Efficient Urea Electrooxidation

文献类型： 外文期刊

作者： 马志辉;; 刘星宇;;王海涛;;谢良波;; 孙治国;; 展海银;; 秘雪岳;; 展思辉;; 周启星

关键词： interfacial regulation;;nanocone structure;;NiOOH;; ultralow onset potential;;urea oxidation reaction

期刊名称： Advanced Energy Materials

ISSN： 1614-6832

年卷期： 2025 年

页码：

收录情况： SCIE（2025版） ; ; EI（2025版）

摘要： Electrochemical urea oxidation reaction (UOR) is widely recognized as a promising approach for achieving energy-efficient hydrogen production and wastewater purification simultaneously. However, the formation of NiOOH reactive species, coupled with efficient CO2 desorption, remains a challenge for achieving superior UOR performance when employing Ni-based electrocatalysts. Herein, NixCo1-x nanocone catalysts were fabricated to enhance the UOR performances. The interfacial modification with Co atoms induced more α-Ni(OH)2 phase formation and electron migration from Ni to Co, thereby notably enhancing the dehydrogenation to generate NiOOH with enriched γ-NiOOH phase, as demonstrated by in situ characterization and computational studies. In addition, the local electric field enhancement and the optimized in-plane/out-of-plane capillary forces derived from the nanocone structure significantly facilitated CO2 desorption and reaction kinetics. Accordingly, the optimal Ni0.9Co0.1-NC electrode exhibited an ultralow onset potential of 1.30 V vs. RHE and a high current density of 332 mA/cm2 at 1.40 V vs. RHE, surmounting Ni-NC and Co-NC by 5.5 and 17 times, respectively. It also demonstrated an excellent durability (90 h), highlighting strong practical potential. This work provides a facile approach for fabricating high-performance Ni-based UOR catalysts and offers insights into interfacial regulation mechanisms of Co doping.

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