Bhosale Mrunal, Murugan Nagaraj, Kim Yoong Ahm, Thangarasu Sadhasivam, Oh Tae-Hwan
School of Chemical Engineering, Yeungnam University, Gyeongsan, 38541, South Korea.
Department of Polymer Engineering, Graduate School, School of Polymer Science and Engineering. Alan G. MacDiarmid Energy Research Institute, Chonnam National University, 77 Yongbong-ro, Buk-gu, Gwangju, 61186, Republic of Korea.
Small Methods. 2025 Mar;9(3):e2401492. doi: 10.1002/smtd.202401492. Epub 2024 Nov 17.
Here, integrated functional components into a hybrid heterostructure via highly stabilized network-like interconnected electronic nanoarchitecture of 1D N-doped holey-carbon nanotube (NHCNT) with 2D nickel─metal-organic framework (Ni─MOF) nanosheets are developed as high-performance electrocatalyst for overall water splitting. The NHCNT promoting electron transport pathways in electrocatalyst, and formation of holes in nanotubes further enables excellent diffusion of ions for promoting the overall reaction rate. An excellent combination of 1D/2D structure of NHCNT/Ni─MOF-4 electrocatalyst exhibits excellent oxygen evolution reaction (η = 207.8 mV, and Tafel = 62.6 mV dec) and reasonable hydrogen evolution reaction (η = 159.8 mV, and Tafel = 107.69 mV dec) activity with consistent and stable performance in a 1 m KOH. The highly interconnected network structure contains Ni and Ni species in the NHCNT/Ni─MOF-4 electrocatalyst, which possesses high specific surface area (SSA) (235.53 m g), electrochemically active surface area (ECSA) (796.2 cm), mass activity (4.76 mA mg), and turnover frequency (3.99 × 10 s), which provide remarkable electrocatalytic performance via generating synergy between the NHCNT and Ni─MOF. For overall water splitting, NHCNT/Ni─MOF-4 attains a low cell voltage (1.77 V@10 mA cm).
在此，通过一维氮掺杂多孔碳纳米管（NHCNT）与二维镍金属有机框架（Ni-MOF）纳米片形成的高度稳定的网络状互连电子纳米结构，将功能组件集成到混合异质结构中，开发出用于全水分裂的高性能电催化剂。NHCNT促进了电催化剂中的电子传输路径，并且纳米管中孔洞的形成进一步实现了离子的优异扩散，从而提高了整体反应速率。NHCNT/Ni-MOF-4电催化剂的一维/二维结构的出色组合表现出优异的析氧反应（η = 207.8 mV，塔菲尔 = 62.6 mV/dec）和合理的析氢反应（η = 159.8 mV，塔菲尔 = 107.69 mV/dec）活性，在1 m KOH中具有一致且稳定的性能。高度互连的网络结构在NHCNT/Ni-MOF-4电催化剂中包含Ni和Ni物种，其具有高比表面积（SSA）（235.53 m²/g）、电化学活性表面积（ECSA）（796.2 cm²）、质量活性（4.76 mA/mg）和周转频率（3.99×10⁻³ s⁻¹），通过在NHCNT和Ni-MOF之间产生协同作用提供了卓越的电催化性能。对于全水分裂，NHCNT/Ni-MOF-4实现了低电池电压（1.77 V@10 mA/cm²）。
