Hollow CeO_x/CoP Heterostructures Using Two‐dimensional Co−MOF as Template for Efficient and Stable Electrocatalytic Water Splitting

Abstract

Constructing heterostructures has been identified as an efficient means to optimize the catalytic activity and boost electrocatalytic performances. Herein, we designed a novel hollow CeOx/CoP heterostructure supported on nickel foam (NF) through two‐dimensional Co‐metal‐organic framework (Co−MOF) as template, which could be used in electrocatalytic water splitting The hollow CeOx/CoP/NF nanocatalyst demonstrated excellent activities toward oxygen evolution reaction (OER) in anode and hydrogen evolution reaction (HER) in cathode with relatively low overpotential (264 mV and 117 mV) at 10 mA cm−2. Besides, the battery potential was only 1.63 V toward electrocatalytic water‐splitting at 10 mA cm−2, and demonstrated excellent operational durability for 60 h. In this work, introducing CeOx significantly enhanced the inherent activity of monophase transition‐metal phosphides (TMPs). Thus, this work may provide a new standpoint for constructing heterostructures with high activity containing transition‐metal compounds and rare earth species for electrocatalytic water splitting.

Constructed Interfacial Oxygen‐Bridge Chemical Bonding in Core‐Shell Transition Metal Phosphides/Carbon Hybrid Boosting Oxygen Evolution Reaction

“…In recent years, extensive efforts have been carried out to design noble-metal-free durable and low-cost OER catalysts. [1][2][3][4][5][6][7][8] Cobaltbased phosphides are emerging as a new class of water oxidation catalysts with reports of high activity. [9][10][11][12][13][14][15][16][17] Nevertheless, the catalytic stability of those catalyst is less than desirable under extreme measurement conditions, and their catalytic activity is limited due to their poor intrinsic activity and low active site exposure.…”

Hollow CeO2@Co2N Nanosheets Derived from Co‐ZIF‐L for Boosting the Oxygen Evolution Reaction

“…The corresponding SEM images (Figure 1b; Figure S2a–c, Supporting Information) show that during hydrothermal treatment (in a Ce(NO 3 ) 3 ·6H 2 O and HMT solution), the Co‐ZIF‐L precursor is converted into CeO 2 @Co‐ZIF‐L hollow nanosheets that are caused by an etching process involving hydrolysis of Co 2+ and oxidation of Ce 3+ . [ 22 ]…”

A Review on Ceo2‐Based Electrocatalyst and Photocatalyst in Energy Conversion

“…Tang et al prepared hollow CeO x /CoP heterostructures supported on nickel foam through co‐based metal‐organic frameworks template. The potential toward water splitting at 10 mA cm −2 was only 1.63 V and the catalyst performed excellent stability within 60 h. [ 63 ] Most recently, Du et al synthesized superhydrophilic Co 4 N–CeO 2 hybrid nanosheet array on a graphite plate for overall water splitting. The cell voltage to drive 10 mA cm −2 was 1.54 V and long‐term durability at 500 mA cm −2 for 50 h. Doping CeO 2 into Co 4 N not only promotes the dissociation of H 2 O and adsorption of hydrogen but also improves the compositional stability, which boosting both OER and HER.…”