钴-铂金属间化合物负载在吡啶型富氮碳上用于超低过电位酸性析氢催化,Materials Chemistry Frontiers

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钴-铂金属间化合物负载在吡啶型富氮碳上用于超低过电位酸性析氢催化
Materials Chemistry Frontiers ( IF 6.0 ) Pub Date : 2023-02-21 , DOI: 10.1039/d3qm00074e
Qiushi Xie ₁ , Jiankun Li ₁ , Keyu Wang ₁ , Shiyi Li ₁ , Weiyi Xu ₁ , Yixing Wang ₁ , Linfeng Lei ₁ , Siyao Li ₁ , Linzhou Zhuang ₁ , Zhi Xu ₁

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铂是酸性介质中析氢反应 (HER) 的高效催化剂，但其稀缺性和高成本严重阻碍了其广泛应用。在此，我们报告了通过简单的混合-煅烧策略制备负载在 N 掺杂碳纳米片 (NCS-CoPt) 上的CoPt _{3纳米粒子。}该策略可以同时实现金属纳米尺寸控制、杂原子协同作用和支持稳定性。NCS-CoPt 的 Ar 煅烧可以形成金属间化合物 CoPt ₃，这可能是高活性的 HER 催化位点，而 H ₂/具有较高还原能力的Ar气氛可以在高温（750°C）下将Co-Pt金属间化合物分解成非价金属纳米粒子。同时，对于 NCS-CoPt，碳基底上高含量的吡啶 N 有利于载体与 CoPt ₃纳米粒子的强相互作用，有助于提高其强大的 HER 活性和稳定性。^{因此，NCS-CoPt 在酸性介质中表现出出色的 HER 活性，需要 41 mV 的超低过电势才能实现 10 mA cm -2}的电流密度。此外，在 50 mV 的过电位下，其质量活性高达 3.17 A mg _Pt^{-1 ，是商业 20 wt% Pt/C 的 7.9 倍。}

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Cobalt–platinum intermetallic composite loaded on pyridinic N-enriched carbon for acidic hydrogen evolution catalysis with ultralow overpotential

Platinum is a highly efficient catalyst for the hydrogen evolution reaction (HER) in acidic media, but its widespread use has been seriously impeded by its scarcity and high cost. Herein, we report the preparation of CoPt₃ nanoparticles loaded on N-doped carbon nanosheets (NCS-CoPt) via a simple mixing-calcination strategy. This strategy could simultaneously achieve metal nanosize controlling, heteroatom synergy, and support stabilization. Ar calcination of NCS-CoPt could form intermetallic compound CoPt₃, which could be the highly active HER catalytic site, while the H₂/Ar atmosphere with higher reducing ability could decompose the Co–Pt intermetallic compound into non-valent metal nanoparticles at a high temperature (750 °C). Meanwhile, for NCS-CoPt, the high content of pyridinic N on the carbon substrate could benefit the strong interaction of the support and CoPt₃ nanoparticles and contribute to its robust HER activity and stability. Consequently, NCS-CoPt exhibits an outstanding HER activity in acidic media, requiring an ultralow overpotential of 41 mV to achieve a current density of 10 mA cm⁻². Moreover, its mass activity reaches up to 3.17 A mg_Pt⁻¹ at an overpotential of 50 mV, which is 7.9 times that of commercial 20 wt% Pt/C.

更新日期：2023-02-21

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