Highly efficient electrocatalytic water splitting by MXene supported CoP nanorods

doi:10.16085/j.issn.1000-6613.2023-0789

Abstract

Abstract:

Transition metal phosphide (TMP) shows great potential in catalyzing electrochemical water splitting for hydrogen (H₂) production. By combining the exceptional electrical conductivity of MXene and the high catalytic activity of TMP, this study aims to enhance the overall performance towards water electrolysis. Specifically, cobalt phosphide nanorods supported by MXene (CoP NRs/Ti₂C) were synthesized through a three-step procedure involving molten salt etching, hydrothermal treatment, and in-situ phosphidation. Under alkaline conditions (1mol/L KOH), CoP NRs/Ti₂C required significantly reduced overpotentials for both the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) to maintain a current density of 10mA/cm², with values of 105mV and 320mV, respectively. In comparison, CoP NRs required higher overpotentials (157mV for HER and 350mV for OER). Furthermore, CoP NRs/Ti₂C demonstrated more favorable reaction kinetics, by lower Tafel slopes (63.4mV/dec for HER and 54.6mV/dec for OER) when compared to CoP NRs (79.6mV/dec for HER and 60.8mV/dec for OER). In a two-electrode configuration employing CoP NRs/Ti₂C, a remarkably low external voltage of only 1.62V was sufficient to achieve 10mA/cm². Collectively, these findings verified the substantial enhancement in electrocatalytic performance facilitated by the Ti₂C support for CoP NRs. Consequently, this study put forth a viable strategy for further improving the catalytic capabilities of TMP, with the potential to supplant noble metal catalysts in hydrogen generation applications.

Key words: electrochemistry, catalysis, hydrogen production, catalyst support, cobalt phosphide

摘要：

过渡金属磷化物在电催化分解水制氢方面具备巨大的潜力，结合MXene优异的导电性能和过渡金属磷化物高效的催化性能，有望大幅提升电解水效能。本研究通过熔盐刻蚀、水热、原位磷化的方法合成了一种在MXene材料Ti₂C上生长的CoP纳米棒（CoP NRs/Ti₂C）。在碱性条件下（1mol/L KOH），反应电流密度为10mA/cm²时，CoP NRs/Ti₂C催化析氢反应（hydrogen evolution reaction，HER）和析氧反应（oxygen evolution reaction，OER）所需的过电位分别为105mV和320mV，远低于CoP纳米棒（157mV和350mV），且在HER和OER过程中具有更小的Tafel斜率（63.4mV/dec和54.6mV/dec）。在全解水过程中，CoP NRs/Ti₂C达到电流密度10mA/cm²时所需的外加电压仅为1.62V。综上，本文提供了一种高性能全解水电催化剂CoP NRs/Ti₂C，为促进过渡金属磷化物取代贵金属提供了一种新的策略。

关键词: 电化学, 催化作用, 制氢, 催化剂载体, 磷化钴

CLC Number:

O646

WAN Chengfeng, LI Zhida, ZHANG Chunyue, LU Lu. Highly efficient electrocatalytic water splitting by MXene supported CoP nanorods[J]. Chemical Industry and Engineering Progress, 2024, 43(6): 3232-3239.

万成凤, 李志达, 张春月, 路璐. MXene负载CoP纳米棒高效电催化分解水制氢[J]. 化工进展, 2024, 43(6): 3232-3239.

Figures/Tables 7

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催化剂	HER过电位/mV	OER过电位/mV	电流密度/mA·cm^-2	参考文献
SCNO@N-CNF	169	247	10	[29]
NiCoP@rGO	297	340	20	[30]
NiWO₄/TM	101	322	10	[31]
SrTiFe_0.9Pr_0.1O_6-δ	278	182	10	[32]
La_0.5Sr_0.5CoO_3-δ/MoSe₂	200	370	10	[33]
NiFeP@N-CS	186	216	10	[34]
CoP/NCNHP	115	310	10	[35]
CoP₂/RGO	88	300	10	[36]
MS-CoP _x -350	190	300	10	[37]
CoP NRs/Ti₂C	105	320	10	本研究

催化剂	HER过电位/mV	OER过电位/mV	电流密度/mA·cm^-2	参考文献
SCNO@N-CNF	169	247	10	[29]
NiCoP@rGO	297	340	20	[30]
NiWO₄/TM	101	322	10	[31]
SrTiFe_0.9Pr_0.1O_6-δ	278	182	10	[32]
La_0.5Sr_0.5CoO_3-δ/MoSe₂	200	370	10	[33]
NiFeP@N-CS	186	216	10	[34]
CoP/NCNHP	115	310	10	[35]
CoP₂/RGO	88	300	10	[36]
MS-CoP _x -350	190	300	10	[37]
CoP NRs/Ti₂C	105	320	10	本研究