NiPN/Ni 纳米颗粒装饰的碳纳米管森林作为一种高效的双功能电催化剂，用于碱性电解质中的整体水分解,ACS Applied Nano Materials

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NiPN/Ni 纳米颗粒装饰的碳纳米管森林作为一种高效的双功能电催化剂，用于碱性电解质中的整体水分解
ACS Applied Nano Materials ( IF 5.3 ) Pub Date : 2022-04-04 , DOI: 10.1021/acsanm.2c00326
Mengzhao Liu ₁ , Erdong Wang ₂ , Zhongkui Zhao ₁

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在这项工作中，碳布（NiPN/Ni/CC-CNT ²) 具有高电化学活性表面积是通过简单的两步法合成的，包括 CNT 森林生长和随后的受控磷化/氮化过程，其中最初负载的 Ni 物种（生长 CNT 森林的活性位点）作为前体用于在 CNT 森林上合成 NiPN/Ni NP 活性物质用于水电解。这是第一个将负载的用于CNT森林生长的Ni位点直接转化为电解水的活性物种而不是通过酸处理去除的例子，充分利用了Ni资源，同时避免了废酸对环境的污染。由于 CNT 森林结构促进了质量/电子转移，以及磷化镍-氮化镍和镍的多界面协同效应提高了内在活性，^图2显示了在碱性介质中对析氢反应（HER，η ₁₀ = 56 mV和η ₁₀₀ = 186 mV）和析氧反应（OER，η ₁₀ = 204 mV和η _{100 = 266 mV）的高活性。}此外，以 NiPN/Ni/CC-CNT ^{2为阳极和阴极的组装双电极电解槽在 10 和 100 mA cm}^–2下分别提供 1.49 和 1.74 V 的低电池电压，并具有出色的电催化耐久性用于整体水分解。开发的低成本双功能 NiPN/Ni/CC-CNT ²优于文献中报道的大多数电催化剂，甚至优于 Pt 和 RuO ₂在大电流密度下分别用于 HER 和 OER 的基准电催化剂。因此，制造的NiPN/Ni/CC-CNT ²显示出大规模商业生产绿色氢作为清洁和可再生燃料以支持碳中和战略的巨大潜力。

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NiPN/Ni Nanoparticle-Decorated Carbon Nanotube Forest as an Efficient Bifunctional Electrocatalyst for Overall Water Splitting in an Alkaline Electrolyte

In this work, a multi-interfacial nickel phosphide-nitride/nickel (NiPN/Ni) nanoparticle (NP)-decorated P,N-doped carbon nanotube (CNT) forest on carbon cloth (NiPN/Ni/CC-CNT²) with a high electrochemical active surface area was synthesized by a facile two-step approach involving the CNT forest growth with a subsequent controlled phosphorization/nitridation procedure, in which the initially loaded Ni species (active sites for growing CNT forest) serve as a precursor for synthesizing NiPN/Ni NP active species on CNT forest for water electrolysis. This is the first example that the loaded Ni sites for CNT forest growth were directly converted to active species for water electrolysis rather than be removed by acid treatment, which fully utilizes Ni resources and simultaneously avoids the waste acid environmental pollution. Thanks to the promoted mass/electron transfer by the CNT forest structure and the improved intrinsic activity by the multi-interfacial synergistic effect of nickel phosphide-nitride and nickel, the resultant NiPN/Ni/CC-CNT² shows high activity toward hydrogen evolution reaction (HER, η₁₀ = 56 mV and η₁₀₀ = 186 mV) and oxygen evolution reaction (OER, η₁₀ = 204 mV and η₁₀₀ = 266 mV) in an alkaline medium. In addition, the assembled two-electrode electrolyzer with NiPN/Ni/CC-CNT² as both the anode and cathode delivers low cell voltages of 1.49 and 1.74 V for 10 and 100 mA cm^–2, respectively, associated with an excellent electrocatalytic durability for overall water splitting. The developed low-cost bifunctional NiPN/Ni/CC-CNT² outperforms most of the reported electrocatalysts in literature and performs even better than the Pt and RuO₂ benchmark electrocatalysts for HER and OER, respectively, at a large current density. Therefore, the fabricated NiPN/Ni/CC-CNT² has shown great potential for large-scale commercial production of green hydrogen as a clean and renewable fuel to support the carbon neutralization strategy.

更新日期：2022-04-04

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