An active nanoporous Ni(Fe) OER electrocatalyst via selective dissolution of Cd in alkaline media
An active nanoporous Ni(Fe) OER electrocatalyst via selective dissolution of Cd in alkaline media
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DOI：
10.1016/j.apcatb.2017.11.053
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发表时间：
2018-06-05
影响因子：
22.1
通讯作者：
Mullins, C. Buddie
中科院分区：
文献类型：
--
作者：
Kim, Jun-Hyuk;Youn, Duck Hyun;Mullins, C. Buddie
尽管用于电化学析氧反应的电催化剂已经取得了重大进展，但由于其缓慢的4-电子转移机制，仍需要进一步突破。Ni被认为是碱性介质中代替贵金属进行析氧反应（OER）的潜在候选者，然而，Ni的效用受到所需的和相对较高的过电位的限制。在这项研究中，我们制作了一个纳米多孔镍结构的选择性和部分溶解的镉从镍镉复合材料（不使用有害的酸或碱）。纳米多孔镍的形成大大提高了OER性能，因为催化位点的数量增加。此外，Cd原子在Ni表面诱导的电催化剂上存在电子促进效应，催化剂的活性可被调控。此外，在多孔Ni-Cd结构上沉积Fe显著提高了OER活性，通过将过电位从eta = 382 mV（Fe沉积前）降低至eta = 290 mV（Fe沉积后）以达到10 mA cm（-2）。
Although there has been a significant progress regarding electrocatalysts for the electrochemical oxygen evolution reaction, further breakthroughs are still required due to its sluggish 4-electron transfer mechanism. Ni is considered as a potential candidate for the oxygen evolution reaction (OER) in alkaline media in lieu of noble metals, however, the utility of Ni has been limited by the required and relatively high overpotentials. In this study, we fabricated a nanoporous Ni structure by selective and partial dissolution of Cd from a NiCd composite (without using hazardous acids or bases). The formation of nanoporous Ni greatly enhanced OER performance because of the increased number of catalytic sites. Furthermore, there was a promotional electronic effect on the electrocatalyst induced by Cd atoms under the Ni surface tuning the catalytic reactivity could be tuned. Additionally, Fe deposition on the porous Ni-Cd structure significantly raised the OER activity via a reduction in the overpotential from a value of eta = 382 mV (before Fe deposition) to eta = 290 mV (after Fe deposition) to achieve 10 mA cm(-2).