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首页> 外文期刊>Journal of Catalysis >Efficient hydrogen production via urea electrolysis with cobalt doped nickel hydroxide-riched hybrid films: Cobalt doping effect and mechanism aspect
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Efficient hydrogen production via urea electrolysis with cobalt doped nickel hydroxide-riched hybrid films: Cobalt doping effect and mechanism aspect

机译：高效氢气通过尿素电解用钴掺杂氢氧化镍氢化杂交膜：钴掺杂效应和机制方面

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摘要

The exploration of earth-abundant catalysts that are highly active and robustly stable for urea electro-oxidation is critical for energy-efficient hydrogen production associated with urea-rich wastewater purification. Herein, Co-doped alpha-Ni(OH)(2) hybrid films with unique ultrafine nanoparticles assembled network structure are constructed as efficient bifunctional electrocatalysts for urea-assisted water electrolysis. By employing a facile potentiodynamic deposition route carried out in a deep eutectic solvent (Ethaline), ultrafine Ni-based nanoparticles with a alpha-Ni(OH)(2) rich surface doping by Co are in-situ grown on Cu foam substrate (Co-x-Ni(OH)(2) NPs/CF), creating an integrated electrode full of intimate contact interfaces. The doping of Co triggers a structural transition with electronic structure changes at the electrode surface and lowers the onset potential required for Ni(OH)(2)/NiOOH, which strongly enhances the urea electrolysis activity. Through potential conditioning procedure, the optimized Co-0.26-Ni(OH)(2) NPs/CF catalyst (with a Ni/Co proportion of 1:0.26) manifests excellent electrocatalytic performance for urea electrolysis in 1.0 M KOH with 0.5 M urea, presenting a low onset potential of 1.27 V vs. RHE for urea oxidation and an overpotential of 106 mV for the hydrogen evolution reaction at 10 mA cm(-2). Impressively, the constructed alkaline urea electrolyzer based on Co-0.26-Ni(OH)(2) NPs/CF delivers 10 mA cm(-2) at a stable output voltage of 1.42 V with robust durability over 38 h and high selectivity. (C) 2019 Elsevier Inc. All rights reserved.
机译：对尿素电氧化高度活性和强大稳定的地球丰富催化剂的探索对于与富含尿素的废水净化相关的能量有效的氢气产生至关重要。这里，具有独特超细纳米颗粒组装网络结构的共掺杂α-Ni（OH）（2）杂化膜被构造为尿素辅助水电解的有效双官能电催化剂。通过在深凝胶溶剂（金属化）中进行的体力沉积型途径，通过CO在Cu泡沫基材上以α-Ni（OH）（2）的富含表面掺杂的超细Ni的纳米颗粒（CO -X-Ni（OH）（2）NPS / CF），创建一个充满亲密接触接口的集成电极。 Co的掺杂触发具有电子结构在电极表面的构造过渡，并降低了Ni（OH）（2）/ NiOOH所需的发作电位，这强大地增强了尿素电解活性。通过潜在的调理程序，优化的CO-0.26-Ni（OH）（2）NPS / CF催化剂（Ni / Co比例为1：0.26）表现出优异的尿素电解的电催化性能，以0.5米的尿素为1.0m KOH，呈现1.27V与γ氧化的低发病电位，以及106mV的过电位，用于10mA cm（-2）的氢进化反应。令人印象深刻地，基于CO-0.26-Ni（OH）（2）NPS / CF的构建的碱性脲电解器在稳定的输出电压为1.42V的稳定输出电压下提供10mA cm（-2），具有超过38小时和高选择性的稳健耐久性。 （c）2019 Elsevier Inc.保留所有权利。

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