Soft-template derived Ni/Mo2C hetero-sheet arrays for large current density hydrogen evolution reaction.
Soft-template derived Ni/Mo2C hetero-sheet arrays for large current density hydrogen evolution reaction.
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DOI：
10.1016/j.jcis.2022.12.085
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发表时间：
2022-12
影响因子：
9.9
通讯作者：
Zhao Liu;Huawei He;Yuxuan Liu;Yi Zhang;Jiawei Shi;J. Xiong;Shunfa Zhou;Jing Li;L. Fan
中科院分区：
文献类型：
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作者：
Zhao Liu;Huawei He;Yuxuan Liu;Yi Zhang;Jiawei Shi;J. Xiong;Shunfa Zhou;Jing Li;L. Fan
实用的结构设计和电子调控对于合成高效的电催化剂具有重要意义。因此，以聚乙烯吡咯烷酮(PVP)为软模板，采用一种简便的软模板方法成功地在泡沫镍骨架(NS-Ni/Mo2C@NF)上制备了Ni/Mo2C异质结纳米片阵列。密度泛函理论计算表明，在NS-Ni/Mo2C@Nf中丰富的Ni/Mo2C异质结可以提供许多具有中等氢吸附自由能(ΔGH*，0.037 eV)的活性中心。由于这种纳米片状阵列结构和丰富的Ni/Mo2C异质结，NS-Ni/Mo2C@Nf催化剂可以有效地催化HER，特别是在大电流密度下。因此，只需要151和271 mV过电位就可以分别提供100 mA/cm2HER和1000 mA/cm2HER。更重要的是，以NS-Ni/Mo2C@Nf为工作电极的制氢试验表明，在工业水槽中常用的500 mA/cm2电流密度下，NS-Ni/Mo2C@Nf能稳定运行500h而不出现活性衰减，表明NS-Ni/Mo2C@Nf具有广阔的应用前景。
Practical structural design and electronic regulation are significant for synthesising efficient electrocatalysts. Therefore, a facile soft-template approach has been applied to successfully grow Ni/Mo2C heterojunction nanosheet arrays on nickel foam (NF) skeleton (NS-Ni/Mo2C@NF) using polyvinylpyrrolidone (PVP) as a soft template. The density functional theory (DFT) calculations reveal that abundant Ni/Mo2C heterojunction in NS-Ni/Mo2C@NF can provide many active sites with a moderate hydrogen adsorption free energy (ΔGH*, 0.037 eV). Benefiting from this nanosheet array structure and abundant Ni/Mo2C heterojunctions, the NS-Ni/Mo2C@NF catalyst can efficiently catalyze HER, especially at large current densities. As a result, only 151 and 271 mV overpotentials are needed to deliver 100 and 1000 mA/cm2HER, respectively. More importantly, the hydrogen production testing with NS-Ni/Mo2C@NF as the working electrode can run stably for 500 h without activity decay under the current density of 500 mA/cm2commonly used in industrial water electrolyzers, indicating that NS-Ni/Mo2C@NF has broad application prospects.