Reduced interfacial tension on ultrathin NiCr-LDH nanosheet arrays for efficient electrocatalytic water oxidation

Reduced interfacial tension on ultrathin NiCr-LDH nanosheet arrays for efficient electrocatalytic water oxidation
复制标题

降低超薄 NiCr-LDH 纳米片阵列的界面张力,实现高效电催化水氧化

DOI:
10.1039/d1ta03863j
复制
发表时间:
2021-06
影响因子:
11.9
通讯作者:
Wei Shiqiang
Wei Shiqiang
中科院分区:
材料科学2区
文献类型:
--
作者:
Zhang Xiuxiu;Sun Xuan;Li Yuanli;Hu Fengchun;Xu Yanzhi;Tian Jie;Zhang Hui;Liu Qinghua;Su Hui;Wei Shiqiang

文献摘要

参考文献

相似文献

降低固液界面张力对实现高效稳定的电催化具有重要作用。在此,我们提出了一种简单的两步水热法来合成超薄原子空位限制的nicr层状双氢氧化物(LDH)纳米片阵列(NiCr-LDH NSAs),以降低固液界面张力,从而获得优越的表面亲水性和极暴露的催化活性表面,用于高效的水氧化。设计的NiCr-LDH NSAs具有17°的静态接触角,与NiCr-LDH(33°)相比,显著降低了50%。结果表明,NiCr-LDH NSAs在20 mA cm-2条件下具有182 mV的超低过电位,在η = 316 mV (200 mA cm-2)条件下具有317.0 a gNi-1的高质量活性,是RuO2的20倍。通过x射线吸收精细结构和operando同步辐射红外光谱,我们在实验中观察到NiCr-LDH NSAs具有大量的配位不饱和NiO6-x活性中心,这有助于羟基的有效吸附,形成关键的*OOH中间体,从而加速四电子反应动力学。
Reducing the solid-liquid interfacial tension plays an important role in the realization of highly-efficient and stable electrocatalysis. Herein, we present a facile two-step hydrothermal method for the synthesis of ultrathin atomic-vacancy-confined NiCr-layered double hydroxide (LDH) nanosheets arrays (NiCr-LDH NSAs) to reduce the solid-liquid interfacial tension, which leads to a superior surface hydrophilicity and an extremely exposed catalytic active surface for highly-efficient water oxidation. The as-designed NiCr-LDH NSAs displays an unexceptionable static contact angle of 17°, which corresponds to a significant reduction of 50% compared to that of NiCr-LDH (33°). As a result, the NiCr-LDH NSAs exhibits an ultra-low overpotential (η) of 182 mV at 20 mA cm-2 and a high mass activity of 317.0 A gNi-1 at η = 316 mV (200 mA cm-2), which is 20 times that of RuO2. By using X-ray absorption fine structure and operando synchrotron radiation infrared spectroscopies, we observe in experiment that the NiCr-LDH NSAs owns numerous coordination-unsaturated NiO6-x active centers, which contributes to the effective adsorption of hydroxyl groups to form the key *OOH intermediates and then accelerates the four-electron reaction kinetics.
DOI: 10.1039/d0ta03470c
发表时间: 2020-07
影响因子: --
作者:
Ying-Hsi Pan;Yanfang Wu;H. Hsain;R. Su;C. Cazorla;Dewei Chu
通讯作者: Ying-Hsi Pan;Yanfang Wu;H. Hsain;R. Su;C. Cazorla;Dewei Chu
DOI: 10.1039/c8nr05974h
发表时间: 2018
期刊: Nanoscale
影响因子: 6.7
作者:
Ye Wen;Fang Xiaoyu;Chen Xuebo;Yan Dongpeng
通讯作者: Yan Dongpeng
DOI: 10.1002/anie.201905281
发表时间: 2019-08-19
影响因子: 16.6
作者:
He, Kai;Tsega, Tsegaye Tadesse;Qian, Xuefeng
通讯作者: Qian, Xuefeng
DOI: 10.1021/jacs.0c04231
发表时间: 2020-07-15
影响因子: 15
作者:
Su, Hui;Zhou, Wanlin;Liu, Qinghua
通讯作者: Liu, Qinghua
DOI: 10.1126/science.aaf5050
发表时间: 2016-09-02
期刊: SCIENCE
影响因子: 56.9
作者:
Seitz, Linsey C.;Dickens, Colin F.;Jaramillo, Thomas F.
通讯作者: Jaramillo, Thomas F.