Carbonized Wood Decorated with Cobalt-Nickel Binary Nanoparticles as a Low-Cost and Efficient Electrode for Water Splitting
Carbonized Wood Decorated with Cobalt-Nickel Binary Nanoparticles as a Low-Cost and Efficient Electrode for Water Splitting
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DOI：
10.1002/adfm.202010951
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发表时间：
2021-05-07
影响因子：
19
通讯作者：
Li, Jian
中科院分区：
文献类型：
--
作者：
Gan, Wentao;Wu, Lianping;Li, Jian
本文采用廉价且环保的木材基底，开发了一步煅烧方法以将存款Co-Ni二元纳米颗粒沉积到对齐的木材通道中，并制备了有效的木材（CW）电极（称为Co/Ni-CW）。通过木材表面羟基与浸渍金属阳离子之间的配位键，实现了Co-Ni纳米粒子的均匀分布。随后，高温煅烧促进了Co-Ni纳米粒子的成核和CW的形成。由于Co-Ni纳米粒子的均匀分布和木材的多孔结构，不仅具有高的活性表面积，而且增强了电子和质量扩散途径。因此，所制备的Co/Ni-CW在330和157 mV的低析氧和析氢过电位下分别提供10 mA cm（-2）的电流密度。值得注意的是，当木基双功能电催化剂同时用作阳极和阴极时，需要1.64 V的低电池电压以达到10 mA cm（-2）的电流密度。与双功能电催化剂中使用的大多数基底相比，木材基催化剂的丰富性、低成本、生态友好性和易于操作允许用于水裂解和许多其他能量存储装置的活性和可扩展的电极。
Using an inexpensive and eco-friendly wood substrate, herein, a one-step calcination method is developed to deposit Co-Ni binary nanoparticles into aligned wood channels and an effective carbonized wood (CW) electrode (termed as Co/Ni-CW) is fabricated. Well distributed Co-Ni nanoparticles are achieved by the coordination bonds between the hydroxyl groups on wood matrix and soaked metal cations. Subsequently, high-temperature calcination promotes the nucleation of Co-Ni nanoparticles and the formation of CW. With the uniform distribution of Co-Ni nanoparticles and porous wood structure, not only is a high active surface area, but also the electron and mass diffusion pathways are enhanced. Thus, the as-prepared Co/Ni-CW affords the current density of 10 mA cm(-2) at low overpotentials of 330 and 157 mV for oxygen and hydrogen evolution, respectively. Remarkably, when the wood-based bifunctional electrocatalyst is used as both the anode and cathode, a low cell voltage of 1.64 V is required to reach the current density of 10 mA cm(-2). Compared with most substrates used in bifunctional electrocatalysts, the abundance, low cost, eco-friendliness, and easy operation of wood-based catalysts allow for an active and scalable electrode for water splitting and many other energy storage devices.