Production of cost-efficient and robust electrocatalysts toward oxygen evaluation reaction (OER) is a challenging work. In this work, cellulose nanofibrils (CNF) obtained from natural plant fiber with distinctive three-dimensional networks are used as structural skeletons and conductive substrates for electrocatalytic materials. One-step pyrolysis of aerogel composed of CNF and nickel salt yields [email protected]₂P nanoparticles encapsulated in nitrogen-doped interconnected carbonized CNF and carbon nanotubes (denoted as [email protected]₂P/N-CNF-CN). Benefiting from the desirable characteristics conferred by the carbon substrates, such as large specific surface area, multitudinous mesopores, and favorable conductivity, the hybrid catalyst exhibits excellent catalytic performance toward OER with a low overpotential of 269 mV to reach a current density of 10 mA cm^–2 and a low Tafel slope of 65.0 mV dec^–1 in 1 M KOH solution. Furthermore, the as-prepared catalyst also reveals favorable stability with 1.7% decay after 20 h long-term chronopotentiometry testing. The approach to convert inexpensive and renewable biopolymers into high value-added carbon based electrocatalytic materials described in the present work provides novel, green, and broader opportunities for the utilization of biomass materials.

中文翻译：

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[电子邮件保护]相互连接的N掺杂碳化纤维素纳米纤维网络中的₂ P封装，可实现高效的放氧反应

向氧气评估反应（OER）生产具有成本效益且坚固的电催化剂是一项艰巨的工作。在这项工作中，从具有独特三维网络的天然植物纤维获得的纤维素纳米原纤维（CNF）被用作电催化材料的结构骨架和导电基质。由CNF和镍盐组成的气凝胶的一步热解过程产生[电子邮件保护的] ₂ P纳米颗粒，包裹在氮掺杂的互连碳化CNF和碳纳米管中（表示为[电子邮件保护的] ₂P / N-CNF-CN）。受益于碳基质赋予的理想特性，例如大的比表面积，众多的中孔和良好的导电性，该杂化催化剂对OER表现出优异的催化性能，具有269 mV的低过电势，可达到10 mA cm的电流密度^–2和1M KOH溶液中的65.0 mV dec ^–1的低Tafel斜率。此外，所制备的催化剂还显示出良好的稳定性，经过20小时长期计时电位测试后衰减为1.7％。本工作中描述的将廉价的可再生生物聚合物转化为高附加值的碳基电催化材料的方法为生物质材料的利用提供了新颖，绿色和广泛的机会。