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高活性 NiO-Ni (OH) -Cr (O) /Ni 气进化电催化剂通过协同反应动力学

Chi-Huang Chuang¹, Pei-Hao Kang¹, Yung-Yu Lai¹

¹Research Center for Applied Sciences, Academia Sinica, 128 Sec. 2, Academia Rd, Nankang, Taipei, 115, Taiwan.

|July 8, 2023

概括

这项研究引入了一种新的非贵金属催化剂,用于演化反应 (HER). 这种先进的材料表现出高活性,使可再生气生产更容易获得.

科学领域:

电化学电化学电化学
材料科学材料科学材料科学
可再生能源可再生能源是可再生能源.

背景情况:

高活性催化剂对于有效的演化反应 (HER) 在将可再生电力转化为燃料方面至关重要.
开发无贵金属催化剂对于水电解的经济可行性至关重要.
目前的研究重点是确定具有与相似的催化活性的替代材料.

研究的目的:

报告一个新的非贵金属氧化物/金属催化剂HER.
评估开发的电催化剂的催化活性和性能.
阐明催化剂增强性能背后的协同机制.

主要方法:

合成和描述一个由NiO,Ni(OH) 2,Cr2O3和Ni金属组成的多组分催化剂.
在1.0m NaOH 电解质中进行电化学测试,以测量各种电流密度的超电位.
密度函数理论 (DFT) 计算以调查反应机制和表面相互作用.

主要成果:

NiO,Ni(OH) 2,Cr2O3 和Ni金属催化剂显示出较低的超电位 (27,103,153 mV 在10,100,200 mA cm-2).
催化剂的活性明显超过了单个成分 (NiOx/Ni或Cr2O3) 的活性,表明了协同效应.
DFT计算显示了降低解离能障碍和优化了Ni表面的H*吸附自由能量.

结论:

多个氧化物和金属组件之间的协同相互作用增强了H-OH键解离和H*到H2演变.
这种新型催化剂组合显示了HER的高活性,与基催化剂相比.
这些发现为设计高效,无贵金属的电催化剂用于生产提供了一个有希望的策略.

关键词:

不对称的亲缘关系双金属催化剂的使用电催化剂是一种电催化剂.气演化反应反应的反应有协同效应的效应.

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