Li Mengyang, Wang Mingran, Wang Qianwei, Cao Yang, Gao Jie, Wang Zhicheng, Gao Meiqi, Duan Guosheng, Cao Feng
Key Lab for Anisotropy and Texture of Materials (MoE), School of Materials Science and Engineering, Northeastern University, Shenyang 110819, China.
School of Safety Engineering, Shenyang Aerospace University, Shenyang 110136, China.
Materials (Basel). 2024 Sep 23;17(18):4670. doi: 10.3390/ma17184670.
Accessible and superior electrocatalysts to overcome the sluggish oxygen evolution reaction (OER) are pivotal for sustainable and low-cost hydrogen production through electrocatalytic water splitting. The iron and nickel oxohydroxide complexes are regarded as the most promising OER electrocatalyst attributed to their inexpensive costs, easy preparation, and robust stability. In particular, the Fe-doped NiOOH is widely deemed to be superior constituents for OER in an alkaline environment. However, the facile construction of robust Fe-doped NiOOH electrocatalysts is still a great challenge. Herein, we report the facile construction of Fe-doped NiOOH on Ni(OH) hierarchical nanosheet arrays grown on nickel foam (FeNi@NiA) as efficient OER electrocatalysts through a facile in-situ electrochemical activation of FeNi-based Prussian blue analogues (PBA) derived from Ni(OH). The resultant FeNi@NiA heterostructure shows high intrinsic activity for OER due to the modulation of the overall electronic energy state and the electrical conductivity. Importantly, the electrochemical measurement revealed that FeNi@NiA exhibits a low overpotential of 240 mV at 10 mA/cm with a small Tafel slope of 62 mV dec in 1.0 M KOH, outperforming the commercial RuO electrocatalysts for OER.
通过电催化水分解实现可持续和低成本制氢，获得可及且性能优异的电催化剂以克服缓慢的析氧反应（OER）至关重要。铁镍羟基氧化物配合物因其成本低廉、制备简便且稳定性强，被视为最具潜力的OER电催化剂。特别是，掺铁的氢氧化镍被广泛认为是碱性环境中OER的优良成分。然而，简便地构建稳定的掺铁氢氧化镍电催化剂仍然是一项巨大挑战。在此，我们报道了通过对源自氢氧化镍的铁镍基普鲁士蓝类似物（PBA）进行简便的原位电化学活化，在泡沫镍上生长的氢氧化镍分级纳米片阵列上简便地构建掺铁氢氧化镍（FeNi@NiA）作为高效OER电催化剂。所得的FeNi@NiA异质结构由于整体电子能态和电导率的调制而表现出高本征OER活性。重要的是，电化学测量表明，FeNi@NiA在1.0 M KOH中，在10 mA/cm²时具有240 mV的低过电位，塔菲尔斜率为62 mV/dec，优于用于OER的商业RuO₂电催化剂。
