MoC based Mott–Schottky electrocatalyst for boosting the hydrogen evolution reaction performance,Sustainable Energy & Fuels

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MoC based Mott–Schottky electrocatalyst for boosting the hydrogen evolution reaction performance
Sustainable Energy & Fuels ( IF 5.0 ) Pub Date : 2019-11-06 , DOI: 10.1039/c9se00897g
Xinyang Ji _{1,

2,

3,

4} , Kaixuan Wang _{1,

2,

3,

4} , Yao Zhang _{2,

3,

4,

5} , Haohao Sun _{4,

6,

7,

8} , Yuanyuan Zhang _{1,

2,

3,

4} , Tiange Ma _{1,

2,

3,

4} , Zhuo Ma _{2,

3,

4,

5} , PingAn Hu _{2,

4,

9,

10} , Yunfeng Qiu _{1,

2,

3,

4,

9}

Affiliation

Searching for promising HER electrocatalysts is an urgent task for the practical application of hydrogen production by water electrolysis. The Mott–Schottky effect between a metal with larger work function and n-type semiconductor with a higher Fermi level will facilitate the electron transfer from the semiconductor toward the metal. As a result, it is possible to design optimal H* adsorption active sites with thermoneutral hydrogen adsorption free energy (ΔG_H*). Herein, MoC nanoparticles with a diameter of about 3.4 nm embedded in N, P-codoped carbon were converted from well-defined polyoxometalates (around 1 nm) and polypyrrole nanocomposites by carbonization and further wrapped on the surface of CNTs. On the basis of improved electron transfer rate, increased carrier densities, and enhanced active site activities on MoC after lowering the work function due to the Mott–Schottky effect with n-type domains in N, P-codoped carbon, our electrocatalysts could drive the current density of 10 mA cm⁻² at 175 mV with a Tafel slope of 62 mV dec⁻¹ and TOF value of 1.49 s⁻¹ at 150 mV, as well as long-term H₂ production stability. The present study provides a new guideline for the design and preparation of Mott–Schottky HER electrocatalysts.

中文翻译：

基于MoC的Mott–Schottky电催化剂，可提高析氢反应的性能

对于水电解制氢的实际应用而言，寻找有前景的HER电催化剂是一项紧迫的任务。具有较大功函数的金属与具有较高费米能级的n型半导体之间的莫特-肖特基效应将促进电子从半导体向金属的转移。结果，可以设计具有热中性氢吸附自由能（ΔG _{H *}）。此处，直径约3.4 nm的MoC纳米颗粒嵌入N，P掺杂的碳中，通过碳化从定义明确的多金属氧酸盐（约1 nm）和聚吡咯纳米复合材料中转化而来，并进一步包裹在CNT的表面上。在提高了电子传输速率，增加了载流子密度并增强了MoC上的活性位点活性之后，由于N，P掺杂碳中的n型域具有Mott-Schottky效应，从而降低了功函，我们的电催化剂可以驱动为10mA厘米的电流密度^-2在175毫伏62毫伏分解的塔菲尔斜率^-1和1.49小号TOF值^-1在150毫伏，以及长项h ₂生产稳定。本研究为Mott–Schottky HER电催化剂的设计和制备提供了新的指导原则。

更新日期：2019-11-06

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