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Bimetallic Nickel‐Substituted Cobalt‐Borate Nanowire Array: An Earth‐Abundant Water Oxidation Electrocatalyst with Superior Activity and Durability at Near Neutral pH
Small ( IF 13.0 ) Pub Date : 2017-05-16 , DOI: 10.1002/smll.201700394 Min Ma 1, 2 , Fengli Qu 3 , Xuqiang Ji 1 , Danni Liu 1 , Shuai Hao 1 , Gu Du 4 , Abdullah M. Asiri 5 , Yadong Yao 2 , Liang Chen 6 , Xuping Sun 1
Small ( IF 13.0 ) Pub Date : 2017-05-16 , DOI: 10.1002/smll.201700394 Min Ma 1, 2 , Fengli Qu 3 , Xuqiang Ji 1 , Danni Liu 1 , Shuai Hao 1 , Gu Du 4 , Abdullah M. Asiri 5 , Yadong Yao 2 , Liang Chen 6 , Xuping Sun 1
Affiliation
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There is an urgent demand to develop earth‐abundant electrocatalysts for efficient and durable water oxidation under mild conditions. A nickel‐substituted cobalt‐borate nanowire array is developed on carbon cloth (Ni‐Co‐Bi/CC) via oxidative polarization of NiCo2S4 nanoarray in potassium borate (K‐Bi). As a bimetallic electrocatalyst for water oxidation, such Ni‐Co‐Bi/CC is superior in catalytic activity and durability in 0.1 m K‐Bi (pH: 9.2), with a turnover frequency of 0.33 mol O2 s−1 at the overpotential of 500 mV and nearly 100% Faradaic efficiency. To drive a geometrical catalytic current density of 10 mA cm−2, it only needs overpotential of 388 mV, 34 mV less than that for Co‐Bi/CC, outperforming reported non‐noble‐metal catalysts operating under benign conditions. Notably, its activity is maintained over 80 000 s. Density functional theory calculations suggest that the O* to OOH* conversion is the rate‐determining step and Ni substitution decreases the free energy on Co‐Bi from 2.092 to 1.986 eV.
中文翻译：
双金属镍取代硼酸钴纳米线阵列：富含地球的水氧化电催化剂，在近中性pH值下具有出色的活性和耐久性
迫切需要开发富含地球的电催化剂，以在温和的条件下有效且持久地进行水氧化。通过在硼酸钾（K-Bi）中对NiCo 2 S 4纳米阵列进行氧化极化，在碳布（Ni-Co-Bi / CC）上开发了镍取代的硼酸钴硼纳米线阵列。作为水氧化的双金属电催化剂，此类Ni-Co-Bi / CC在0.1 m K-Bi（pH：9.2）下具有优异的催化活性和耐久性，在超电势下的周转频率为0.33 mol O 2 s -1 500 mV的功率和接近100％的法拉第效率。驱动10 mA cm -2的几何催化电流密度，它仅需要388 mV的过电势，比Co-Bi / CC的过电势低34 mV，优于在良性条件下运行的报道的非贵金属催化剂。值得注意的是，它的活动保持在80 000 s以上。密度泛函理论计算表明，O *到OOH *的转化是决定速率的步骤，Ni取代将Co-Bi的自由能从2.092 eV降低到1.986 eV。
更新日期：2017-05-16
中文翻译：
双金属镍取代硼酸钴纳米线阵列：富含地球的水氧化电催化剂，在近中性pH值下具有出色的活性和耐久性
迫切需要开发富含地球的电催化剂，以在温和的条件下有效且持久地进行水氧化。通过在硼酸钾（K-Bi）中对NiCo 2 S 4纳米阵列进行氧化极化，在碳布（Ni-Co-Bi / CC）上开发了镍取代的硼酸钴硼纳米线阵列。作为水氧化的双金属电催化剂，此类Ni-Co-Bi / CC在0.1 m K-Bi（pH：9.2）下具有优异的催化活性和耐久性，在超电势下的周转频率为0.33 mol O 2 s -1 500 mV的功率和接近100％的法拉第效率。驱动10 mA cm -2的几何催化电流密度，它仅需要388 mV的过电势，比Co-Bi / CC的过电势低34 mV，优于在良性条件下运行的报道的非贵金属催化剂。值得注意的是，它的活动保持在80 000 s以上。密度泛函理论计算表明，O *到OOH *的转化是决定速率的步骤，Ni取代将Co-Bi的自由能从2.092 eV降低到1.986 eV。
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