Tungsten-doped CoP nanoneedle arrays grown on carbon cloth as efficient bifunctional electrocatalysts for overall water splitting
Tungsten-doped CoP nanoneedle arrays grown on carbon cloth as efficient bifunctional electrocatalysts for overall water splitting
复制标题
在碳布上生长的掺钨 CoP 纳米针阵列作为整体水分解的高效双功能电催化剂
DOI：
10.1002/celc.201901417
复制
发表时间：
2019
期刊：
影响因子：
4
通讯作者：
Kaifu Huo
中科院分区：
文献类型：
--
作者：
Zhiguo Ren;Xiaochuan Ren;Liao Zhang;Cehuang Fu;Xiaofang Li;Yingxi Zhang;Biao Gao;Lijun Yang;Paul K. Chu;Kaifu Huo
开发高效廉价的双功能电催化剂具有高活性和耐久性，用于析氢反应（HER）和析氧反应（OER）是非常可取的，但具有挑战性。在本文中，我们报告了在导电碳布（W-CoP/CC）上的钨掺杂磷化钴纳米针阵列的设计和制备，作为用于整体水裂解的高效和稳定的HER和OER电催化剂。纳米针阵列提供富集的活性位点并促进离子扩散，并且3D导电CC骨架能够实现快速电荷传输。此外，钨掺杂提高了水吸附能力，优化了氢吸附能，并增加了电化学活性表面积，从而导致HER和OER催化活性大大提高。在电流密度为10 mA cm-2的0.5 M H2SO 4电解液中，W-CoP/CC复合材料的HER过电位为32 mV，在1 M KOH溶液中，HER和OER分别为77和252 mV，优于大多数先前报道的金属磷化物电催化剂。 采用W−CoP/CC作为阳极和阴极的全水分解电解槽在1.59 V的低槽电压下实现了10 mA cm− 2的稳定电流密度，即使在运行20 h后也没有明显的电压变化。 研究结果为设计和制备高性能非贵金属磷化物提供了一种新的策略。
The development of efficient and inexpensive bifunctional electrocatalysts with high activity and durability for both the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) are highly desirable but challenging. Herein, we report the design and preparation of tungsten‐doped cobalt phosphide nanoneedle arrays on conductive carbon cloth (W−CoP/CC) as highly efficient and stable HER and OER electrocatalysts for overall water splitting. The nanoneedle array provides enriched active sites and facilitates ion diffusion and the 3D conductive CC skeleton enables fast charge transport. Moreover, tungsten doping improves the water adsorption ability, optimizes the hydrogen adsorption energy, and increases the electrochemical active surface area thereby resulting in much improved HER and OER catalytic activity. The W−CoP/CC composite shows low overpotentials of 32 mV at a current density of 10 mA cm−2in 0.5 M H2SO4electrolyte for HER and 77 and 252 mV in 1 M KOH solution for HER and OER, respectively, outperforming most previously reported metal phosphide electrocatalysts. The electrolyzer for overall water splitting with W−CoP/CC as both the anode and cathode achieves a stable current density of 10 mA cm−2at a low cell voltage of 1.59 V with no obvious voltage change even after operation for 20 h. The results provide a new strategy to design and prepare high‐performance non‐noble metal phosphides for overall water splitting.