Three-Dimensional Mesoporous Phosphide-Spinel Oxide Heterojunctions with Dual Function as Catalysts for Overall Water Splitting

doi:10.1021/acsaem.9b02155

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	Three-Dimensional Mesoporous Phosphide-Spinel Oxide Heterojunctions with Dual Function as Catalysts for Overall Water Splitting
	Saad, Ali ; Shen, Hangjia ; Cheng, Zhixing ; Ju, Qjangjian ; Guo, Haichuan ; Munir, Muhammad ; Turak, Ayse ; Wang, Jiacheng ; Yang, Minghui
刊名	ACS APPLIED ENERGY MATERIALS
	2020
卷号	3 期号:2 页码:1684-1693
关键词	COBALT OXIDE EVOLUTION ELECTROCATALYSTS PERFORMANCE NANOSHEETS HYDROGEN REDUCTION NANOWIRE ARRAYS CO3O4
DOI	10.1021/acsaem.9b02155
英文摘要	Highly efficient electrocatalysts for oxygen evolution (OER) and hydrogen evolution reactions (HER) are critical in the development of efficient and sustainable alternative energy. Toward this goal, we report on the nanocasting synthesis of a three-dimensionally (3D) mesoporous CoP/CoCr2O4 heterojunction as efficient bifunctional electrodes for use in overall water splitting in alkaline media. The phosphorization of mesoporous CoCr2O4 nanocast from a KIT-6 hard silica template leads to phase transformation and separation, spontaneously forming a heterojunction between CoP and spine] CoCr2O4 with attractive nanostructured properties (large surface area of 83 m2/g with 4.8 nm diameter accessible mesopores). This phosphide-spinel oxide heterojunction catalyst yields excellent catalytic activity for both OER and HER with overpotentials of only 290 and 212 mV, respectively, to achieve the benchmark current density of 10 mA cm(-2) in a 1.0 M KOH electrolyte. Moreover, CoP/CoCr2O4 shows small Tafel slopes with outstanding durability and long-life stability in alkaline media. Finally, the bifunctionality of CoP/CoCr2O4 for both OER and HER was shown by producing symmetric electrodes in an alkaline water electrolyzer, resulting in a low cell voltage of 1.68 V with 24 h durability, making it among the best Co-based electrocatalysts for overall water splitting. Such bifunctionality suggests a cost-effective heterojunction-based system for water electrolysis using inexpensive earth-abundant metals. The simple route to achieving an effective bifunctional material, which can be applied to various transition-metal-based homo- or heterojunctions, offers a paradigm for templated bifunctional electrode materials.
学科主题	Chemistry ; Energy & Fuels ; Materials Science
内容类型	期刊论文
源URL	[http://ir.nimte.ac.cn/handle/174433/20031]
专题	2020专题
作者单位	1.Wang, JC (corresponding author), Chinese Acad Sci, State Key Lab High Performance Ceram & Superfine, Shanghai Inst Ceram, Shanghai 200050, Peoples R China. 2.Turak, A (corresponding author), McMaster Univ, Dept Engn Phys, Hamilton, ON L8S 4L7, Canada. 3.Wang, JC 4.Yang, MH (corresponding author), Univ Chinese Acad Sci, Ctr Mat Sci & Optoelect Engn, Beijing 100049, Peoples R China. 5.Yang, MH (corresponding author), Chinese Acad Sci, Ningbo Inst Mat Technol & Engn, Ningbo 315201, Peoples R China.
推荐引用方式 GB/T 7714	Saad, Ali,Shen, Hangjia,Cheng, Zhixing,et al. Three-Dimensional Mesoporous Phosphide-Spinel Oxide Heterojunctions with Dual Function as Catalysts for Overall Water Splitting[J]. ACS APPLIED ENERGY MATERIALS,2020,3(2):1684-1693.
APA	Saad, Ali.,Shen, Hangjia.,Cheng, Zhixing.,Ju, Qjangjian.,Guo, Haichuan.,...&Yang, Minghui.(2020).Three-Dimensional Mesoporous Phosphide-Spinel Oxide Heterojunctions with Dual Function as Catalysts for Overall Water Splitting.ACS APPLIED ENERGY MATERIALS,3(2),1684-1693.
MLA	Saad, Ali,et al."Three-Dimensional Mesoporous Phosphide-Spinel Oxide Heterojunctions with Dual Function as Catalysts for Overall Water Splitting".ACS APPLIED ENERGY MATERIALS 3.2(2020):1684-1693.