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Bao L, Fang LJ, Xiao MY, Lu MQ, Chu B, Shi L, Gao S, Xiang QQ, Wang YT, Liu X, Ding YH, Xin Z, Chen Y, Wang MZ, Hu WK, Guo CY, Chen LY, Sun K. Validation of the IMPEDE VTE score for prediction of venous thromboembolism in Chinese patients with multiple myeloma: A single-center retrospective cohort study. Thromb Res 2024; 236:130-135. [PMID: 38430904 DOI: 10.1016/j.thromres.2024.02.011] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2023] [Revised: 02/11/2024] [Accepted: 02/13/2024] [Indexed: 03/05/2024]
Abstract
Multiple myeloma (MM) significantly increases the risk of venous thromboembolism (VTE) within 6 months of treatment initiation. The IMPEDE VTE score is a VTE risk prediction model which is recently incorporated into the National Comprehensive Cancer Network (NCCN) guidelines, but it lacks validation among Asians, including Chinese MM patients. We performed a retrospective chart review of 405 Chinese with newly diagnosed MM who started therapy at Beijing Jishuitan Hospital between April 2013 to October 2022. The 6-month cumulative incidence of VTE was 3.8 % (95 % CI:1.6-7.6), 8.6 % (95 % CI: 5.3-21.9) and 40.5 % (95 % CI: 24.9-55.7) in the low-, intermediate- and high-risk groups (P < 0.001), respectively. The C-statistic of the IMPEDE VTE scores for predicting VTE within 6 months of treatment initiation was 0.74 (95 % CI: 0.65-0.83). Of note, in this single-center cohort study, we propose that the anticoagulant LMWH may be more effective than the antiplatelet aspirin in potentially preventing VTE in newly diagnosed MM patients. Our findings suggest that the IMPEDE VTE score is a valid evidence-based risk stratification tool in Chinese patients with newly diagnosed MM.
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Affiliation(s)
- Li Bao
- Department of Hematology, Beijing Jishuitan Hospital, Capital Medical University, Beijing, China.
| | - Li-Juan Fang
- Department of Hematology, Beijing Jishuitan Hospital, Capital Medical University, Beijing, China
| | - Meng-Yu Xiao
- Peking University People's Hospital, Peking University Institute of Hematology, Collaborative Innovation Center of Hematology, National Clinical Research Center for Hematologic Disease, Beijing Key Laboratory of Hematopoietic Stem Cell Transplantation, Beijing, China
| | - Min-Qiu Lu
- Department of Hematology, Beijing Jishuitan Hospital, Capital Medical University, Beijing, China
| | - Bin Chu
- Department of Hematology, Beijing Jishuitan Hospital, Capital Medical University, Beijing, China
| | - Lei Shi
- Department of Hematology, Beijing Jishuitan Hospital, Capital Medical University, Beijing, China
| | - Shan Gao
- Department of Hematology, Beijing Jishuitan Hospital, Capital Medical University, Beijing, China
| | - Qiu-Qing Xiang
- Department of Hematology, Beijing Jishuitan Hospital, Capital Medical University, Beijing, China
| | - Yu-Tong Wang
- Department of Hematology, Beijing Jishuitan Hospital, Capital Medical University, Beijing, China
| | - Xi Liu
- Department of Hematology, Beijing Jishuitan Hospital, Capital Medical University, Beijing, China
| | - Yue-Hua Ding
- Department of Hematology, Beijing Jishuitan Hospital, Capital Medical University, Beijing, China
| | - Zhao Xin
- Department of Hematology, Beijing Jishuitan Hospital, Capital Medical University, Beijing, China
| | - Yuan Chen
- Department of Hematology, Beijing Jishuitan Hospital, Capital Medical University, Beijing, China
| | - Meng-Zhen Wang
- Department of Hematology, Beijing Jishuitan Hospital, Capital Medical University, Beijing, China
| | - Wei-Kai Hu
- Department of Hematology, Beijing Jishuitan Hospital, Capital Medical University, Beijing, China
| | - Cheng-Yu Guo
- Department of Hematology, Beijing Jishuitan Hospital, Capital Medical University, Beijing, China
| | - Ling-Yun Chen
- Department of Hematology, Beijing Jishuitan Hospital, Capital Medical University, Beijing, China
| | - Kai Sun
- Department of Hematology, Beijing Jishuitan Hospital, Capital Medical University, Beijing, China
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Fang LJ, Yao XD, Lu MQ, Chu B, Shi L, Gao S, Xiang QQ, Wang YT, Liu X, Ding YH, Chen Y, Wang MZ, Zhao X, Hu WK, Sun K, Bao L. [Comparison of the predictive value of Padua and the IMPEDE assessment scores for venous thromboembolism in patients with newly diagnosed multiple myeloma: A single institution experience]. Zhonghua Xue Ye Xue Za Zhi 2023; 44:395-400. [PMID: 37550189 PMCID: PMC10440615 DOI: 10.3760/cma.j.issn.0253-2727.2023.05.007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Received: 11/05/2022] [Indexed: 08/09/2023]
Abstract
Objective: To compare the predictive efficacy of the two thrombosis risk assessment scores (Padua and IMPEDE scores) in venous thromboembolism (VTE) within 6 months in patients with newly diagnosed multiple myeloma (NDMM) in China. Methods: This study reviewed the clinical data of 421 patients with NDMM hospitalized in Beijing Jishuitan Hospital from April 2014 to February 2022. The sensitivity, specificity, accuracy, and Youden index of the two scores were calculated to quantify the thrombus risk assessment of VTE by the Padua and IMPEDE scores. The receiver operating characteristics curves of the two evaluation scores were drawn. Results: The incidence of VTE was 14.73%. The sensitivity, specificity, accuracy, and Youden index of the Padua score were 100%, 0%, 14.7%, and 0% and that of the IMPEDE score was 79%, 44%, 49.2%, and 23%, respectively. The areas under the curve of Padua and IMPEDE risk assessment scores were 0.591 and 0.722, respectively. Conclusion: IMPEDE score is suitable for predicting VTE within 6 months in patients with NDMM.
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Affiliation(s)
- L J Fang
- Department of Hematology, Beijing Jishuitan Hospital, Beijing 100096, China
| | - X D Yao
- Department of Hematology, Beijing Jishuitan Hospital, Beijing 100096, China
| | - M Q Lu
- Department of Hematology, Beijing Jishuitan Hospital, Beijing 100096, China
| | - B Chu
- Department of Hematology, Beijing Jishuitan Hospital, Beijing 100096, China
| | - L Shi
- Department of Hematology, Beijing Jishuitan Hospital, Beijing 100096, China
| | - S Gao
- Department of Hematology, Beijing Jishuitan Hospital, Beijing 100096, China
| | - Q Q Xiang
- Department of Hematology, Beijing Jishuitan Hospital, Beijing 100096, China
| | - Y T Wang
- Department of Hematology, Beijing Jishuitan Hospital, Beijing 100096, China
| | - X Liu
- Department of Hematology, Beijing Jishuitan Hospital, Beijing 100096, China
| | - Y H Ding
- Department of Hematology, Beijing Jishuitan Hospital, Beijing 100096, China
| | - Y Chen
- Department of Hematology, Beijing Jishuitan Hospital, Beijing 100096, China
| | - M Z Wang
- Department of Hematology, Beijing Jishuitan Hospital, Beijing 100096, China
| | - X Zhao
- Department of Hematology, Beijing Jishuitan Hospital, Beijing 100096, China
| | - W K Hu
- Department of Hematology, Beijing Jishuitan Hospital, Beijing 100096, China
| | - K Sun
- Department of Hematology, Beijing Jishuitan Hospital, Beijing 100096, China
| | - L Bao
- Department of Hematology, Beijing Jishuitan Hospital, Beijing 100096, China
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Xiang QQ, Chu B, Lu MQ, Shi L, Gao S, Wang YT, Fang LJ, Ding YH, Zhao X, Chen Y, Wang MZ, Hu WK, Wang LF, Sun K, Bao L. Risk-benefit ratio of percutaneous kyphoplasty and percutaneous vertebroplasty in patients with newly diagnosed multiple myeloma with vertebral fracture: a single-center retrospective study. Ann Hematol 2023; 102:1513-1522. [PMID: 36997718 PMCID: PMC10182123 DOI: 10.1007/s00277-023-05202-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2022] [Accepted: 03/25/2023] [Indexed: 04/01/2023]
Abstract
The indications for percutaneous kyphoplasty (PKP) and percutaneous vertebroplasty (PVP) are painful vertebral compression fractures. Our study is to assess the risk-benefit ratio of PKP/PVP surgery in the patients with newly diagnosed multiple myeloma (NDMM) without receiving antimyeloma therapy. The clinical data of 426 consecutive patients with NDMM admitted to our center from February 2012 to April 2022 were retrospectively analyzed. The baseline data, postoperative pain relief, the proportion of recurrent vertebral fractures, and survival time were compared between the PKP/PVP surgical group and the nonsurgical group in the NDMM patients. Of the 426 patients with NDMM, 206 patients had vertebral fractures (206/426, 48.4%). Of these, 32 (32/206, 15.5%) underwent PKP/PVP surgery for misdiagnosis of simple osteoporosis prior to diagnosis of MM (surgical group), and the other 174 (174/206, 84.5%) did not undergo surgical treatment prior to definitive diagnosis of MM (non-surgical group). The median age of patients in the surgical and nonsurgical groups was 66 and 62 years, respectively (p = 0.01). The proportion of patients with advanced ISS and RISS stages was higher in the surgical group (ISS stage II + III 96.9% vs. 71.8%, p = 0.03; RISS stage III 96.9% vs. 71%, p = 0.01). Postoperatively, 10 patients (31.3%) never experienced pain relief and 20 patients (62.5%) experienced short-term pain relief with a median duration of relief of 2.6 months (0.2-24.1 months). Postoperative fractures of vertebrae other than the surgical site occurred in 24 patients (75%) in the surgical group, with a median time of 4.4 months postoperatively (0.4-86.8 months). Vertebral fractures other than the fracture site at the first visit occurred in 5 patients (2.9%) in the nonoperative group at the time of diagnosis of MM, with a median time of 11.9 months after the first visit (3.5-12.6 months). The incidence of secondary fractures was significantly higher in the surgical group than in the nonsurgical group (75% vs. 2.9%, p = 0.001). The time interval between the first visit and definitive diagnosis of MM was longer in the surgical group than in the nonsurgical group (6.1 months vs. 1.6 months, p = 0.01). At a median follow-up of 32 months (0.3-123 months), median overall survival (OS) was significantly shorter in the surgical group than in the nonsurgical group (48.2 months vs. 66 months, p = 0.04). Application of PKP/PVP surgery for pain relief in NDMM patients without antimyeloma therapy has a limited effect and a high risk of new vertebral fractures after surgery. Therefore, patients with NDMM may need to have their disease controlled with antimyeloma therapy prior to any consideration for PKP/PVP surgery.
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Affiliation(s)
- Qiu-Qing Xiang
- Department of Hematology, Beijing Jishuitan Hospital, Beijing, China
| | - Bin Chu
- Department of Hematology, Beijing Jishuitan Hospital, Beijing, China
| | - Min-Qiu Lu
- Department of Hematology, Beijing Jishuitan Hospital, Beijing, China
| | - Lei Shi
- Department of Hematology, Beijing Jishuitan Hospital, Beijing, China
| | - Shan Gao
- Department of Hematology, Beijing Jishuitan Hospital, Beijing, China
| | - Yu-Tong Wang
- Department of Hematology, Beijing Jishuitan Hospital, Beijing, China
| | - Li-Juan Fang
- Department of Hematology, Beijing Jishuitan Hospital, Beijing, China
| | - Yue-Hua Ding
- Department of Hematology, Beijing Jishuitan Hospital, Beijing, China
| | - Xin Zhao
- Department of Hematology, Beijing Jishuitan Hospital, Beijing, China
| | - Yuan Chen
- Department of Hematology, Beijing Jishuitan Hospital, Beijing, China
| | - Meng-Zhen Wang
- Department of Hematology, Beijing Jishuitan Hospital, Beijing, China
| | - Wei-Kai Hu
- Department of Hematology, Beijing Jishuitan Hospital, Beijing, China
| | - Li-Fang Wang
- Department of Epidemiology and Statistics, Beijing Jishuitan Hospital, Beijing, China
| | - Kai Sun
- Department of Hematology, Beijing Jishuitan Hospital, Beijing, China
| | - Li Bao
- Department of Hematology, Beijing Jishuitan Hospital, Beijing, China.
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Deng CH, Hu WK. [Septic shock induced by latent odontogenic orbital infection: a case report]. Zhonghua Yan Ke Za Zhi 2022; 58:380-382. [PMID: 35511666 DOI: 10.3760/cma.j.cn112142-20210829-00398] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
A 65-year-old patient was admitted to the hospital due to proptosis of the left eye accompanied with ophthalmodynia and toothache for two months. Ophthalmic examination revealed a palpable mass around the lateral orbit and temporal fossa, and maxillofacial CT suggested a malignant tumor invading the left orbital floor wall. One week later, the patient was diagnosed with left orbital cellulitis and septic shock due to peri-orbit redness, eyelid edema, chest tightness, nausea, vomiting, hypotension, and a marked increase in peripheral blood neutrophil count. The infection was well controlled after remission of shock, anti-infective therapy and surgical drainage. At 2 months after surgery, the surgical incision of the upper eyelid skin recovered well and the best corrected visual acuity of the left eye was 1.0.
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Affiliation(s)
- C H Deng
- Department of Ophthalmology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, China
| | - W K Hu
- Department of Ophthalmology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, China
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Hu WK, Liu J, Liu RX, Liu XW, Yin CH. Congenital bilateral cryptorchidism in an infant conceived after maternal breast cancer treatment: A case report. World J Clin Cases 2021; 9:2923-2929. [PMID: 33969078 PMCID: PMC8058667 DOI: 10.12998/wjcc.v9.i12.2923] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/18/2020] [Revised: 01/26/2021] [Accepted: 02/22/2021] [Indexed: 02/06/2023] Open
Abstract
BACKGROUND The incidence of breast cancer among women of reproductive age is increasing, as well as the desire for children at late childbearing age. Identifying factors that may be associated with fetal malformation and maternal and fetal prognosis has gained importance. We describe a 32-year-old woman with breast cancer who gave birth to a son with congenital bilateral cryptorchidism after treatment, with a literature review performed.
CASE SUMMARY A 32-year-old woman with breast cancer who had been treated by surgery and radiotherapy experienced recurrence and underwent a second surgery, adjuvant chemotherapy, and targeted therapy. Her tumor cells were negative for estrogen receptor (ER) α, progesterone receptor (PR), and p53; positive for ERβ, human epidermal growth factor receptor-2 (HER2), epidermal growth factor receptor (EGFR), and Ki67. She had pathogenic BRCA gene mutations. She became pregnant within 2 years and delivered a boy with congenital bilateral cryptorchidism. The boy underwent bilateral orchidopexy. As of this writing, the woman and her son are both healthy.
CONCLUSION HER2 overexpression, positivity for EGFR, Ki67, and ER, and PR negativity are associated with a poor prognosis in breast cancer. While no link has been established statistically between treatment for breast cancer and cryptorchidism in a subsequent pregnancy, this case suggests the possibility that ERβ and gene mutations may be contributing factors.
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Affiliation(s)
- Wei-Kai Hu
- Department of Internal Medicine, Beijing Obstetrics and Gynecology Hospital, Capital Medical University, Beijing 100026, China
| | - Jing Liu
- Department of Obstetrics, Beijing Obstetrics and Gynecology Hospital, Capital Medical University, Beijing 100026, China
| | - Rui-Xia Liu
- Central Laboratory, Beijing Obstetrics and Gynecology Hospital, Capital Medical University, Beijing 100026, China
| | - Xiao-Wei Liu
- Department of Obstetrics, Beijing Obstetrics and Gynecology Hospital, Capital Medical University, Beijing 100026, China
| | - Cheng-Hong Yin
- Department of Internal Medicine, Beijing Obstetrics and Gynecology Hospital, Capital Medical University, Beijing 100026, China
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Li HX, Xiang N, Hu WK, Jiao XL. Relation between therapy options for Graves' disease and the course of Graves' ophthalmopathy: a systematic review and meta-analysis. J Endocrinol Invest 2016; 39:1225-1233. [PMID: 27220843 DOI: 10.1007/s40618-016-0484-y] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/11/2016] [Accepted: 05/07/2016] [Indexed: 12/11/2022]
Abstract
BACKGROUND The relation between therapy options for Graves' disease (GD) and the course of Graves' ophthalmopathy (GO) are still controversial. Our aim was to compare the occurrence of development or worsening of GO in patients who were treated with antithyroid drugs (ATDs) or radioactive iodine (RAI) or thyroidectomy (TX). METHODS We conducted a comprehensive search of the Embase and PubMed database. Odds ratio (OR) was used as a measure of the effect of therapy options for GD on the risk of development or worsening of GO. The analysis was further stratified by factors that could affect the treatment effects. RESULTS Nine trials involving 1773 patients were included. RAI therapy showed a significant effect on the risk of development or worsening GO compared with ATD (OR 2.25; 95 % CI 1.61-3.14; P < 0.00001). Glucocorticoid prophylaxis was effective in preventing GO development or worsening (0.40; 0.23-0.68; P = 0.002); especially for patients with preexisting GO (0.41; 0.23-0.73; P = 0.002). At 3 months, showed GO to be improved in 17 TX and 21 total thyroid ablation (TTA) patients, with no significant difference between the two groups; between 6 and 12 months, TTA did show significant beneficial effect on the improvement of GO (6.02; 2.80-12.96; P < 0.00001); GO was found to be inactive in a significantly higher percentage of patients in the TTA (2.17; 1.04-4.52; P = 0.04). CONCLUSION Radioiodine therapy is a significant risk factor for development or worsening of GO in GD. But GO progression can be prevented by prophylactic glucocorticoids in patients with preexisting GO. Compared with TX alone, TTA induces an earlier and steadier GO improvement in patients with mild to moderate-severe and active GO. Whether this is sufficient to offer TTA to patients needs further investigation.
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Affiliation(s)
- H X Li
- Tianjin Eye Hospital, Clinical College of Ophthalmology, Tianjin Medical University, Tianjin, 300020, China
| | - N Xiang
- Department of Ophthalmology, Tong Ji Hospital, Tong Ji Medical College, Huazhong University of Science and Technology, No. 1095. Jiefang Rd, Hankou District, Wuhan, 430030, China.
| | - W K Hu
- Department of Ophthalmology, Tong Ji Hospital, Tong Ji Medical College, Huazhong University of Science and Technology, No. 1095. Jiefang Rd, Hankou District, Wuhan, 430030, China
| | - X L Jiao
- Tianjin Eye Hospital, Clinical College of Ophthalmology, Tianjin Medical University, Tianjin, 300020, China
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Xiang N, Liu R, Zhang SJ, Hu WK, Zhan XY, Luo B, Ai T. [A comparative study of lacrimal magnetic resonance hydrography and lacrimal endoscopy examination in the diagnosis and treatment of lacrimal duct obstructive diseases]. Zhonghua Yan Ke Za Zhi 2016; 52:117-22. [PMID: 26906707 DOI: 10.3760/cma.j.issn.0412-4081.2016.02.008] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
OBJECTIVE To evaluate the diagnostic value and treatment guidance of lacrimal magnetic resonance hydrography (LMRH) and lacrimal endoscopy examination in lacrimal duct obstruction. METHODS A retrospective analysis of clinical and imaging data of 59 patients with epiphora who had LMRH examination in Tongji Hospital during June 2013 and January 2014. Multiplanar reconstruction (MPR) and maximum intensity projection (MIP) were used to process the three dimensions T2-weighted images (T2WI). The size of lacrimal sac, lacrimal mucosal lesions and the obstructed plane of nasolacrimal duct were observed. The lacrimal irrigation results were used as gold standard. The sensitivity, specificity, accuracy of LMRH in diagnosis of lacrimal duct obstructive diseases and the consistency between the two methods were analyzed. In addition, 22 cases had lacrimal endoscopy examination in less than half month after MRD. The results of lacrimal endoscopy were compared with LMRH images. The treatment method was made according to the results of LMRH and lacrimal endoscopy. RESULTS According to the results of lacrimal irrigation, among 78 eyes of 59 patients, 2 eyes were diagnosed as lacrimal canalicular obstruction (2.6%, 2/78), 8 eyes were diagnosed as nasolacrimal duct stenosis (10.3%, 8/78), 24 eyes were diagnosed as nasolacrimal duct obstruction (30.8%, 24/78), 44 eyes were diagnosed as nasolacrimal duct obstruction accompanied with chronic dacryocystitis (56.4%, 44/78). The other 40 eyes were negative controls. LMRH had a high degree of consistency with lacrimal irrigation in diagnosis of lacrimal duct obstructive diseases. The value of Kappa was 0.963 (P= 0.026). The sensitivity of MRD in diagnosis of lacrimal duct obstructive diseases was 97.4%, the specificity was 100%, the accuracy was 98.3%, the positive predictive value was 100% and the negative predictive value was 95.2% . According to 40 eyes of the control group, the mean value of the maximum cross-sectional area of the lacrimal sac was: (10.9 ± 0.4) mm(2). Twenty-two eyes underwent lacrimal endoscopy examination and the endoscopic findings were consistent with LMRH diagnosis. The lesions in the lacrimal duct displayed more clearly and intuitively than the LMRH, while LMRH had its unique advantages in showing the size of lacrimal sac, the mucosal thickness of lacrimal duct, large foreign bodies and lesions around the lacrimal duct. According to the results of LMRH and lacrimal endoscopy, 2 eyes of canalicular obstruction, 8 eyes of nasolacrimal duct stenosis, 20 eyes of nasolacrimal duct obstruction underwent lacrimal probing and stent implantation. Four eyes of nasolacrimal duct obstruction had drug treatment under lacrimal endoscopy. Thirty-eight eyes of chronic dacryocystitis underwent endonasal dacryocystorhinostomy. The other 6 eyes of chronic dacryocystitis underwent stent removal combined with endonasal dacryocystorhinostomy. CONCLUSIONS LMRH is a noninvasive and reliable method to examine the lacrimal duct obstruction. It can better display the size of lacrimal sac, lacrimal mucosal thickness and surrounding soft tissues of lacrimal duct. It is also a good complementary method of lacrimal endoscopy and has guiding significance for individualized treatment in patients with lacrimal duct obstruction.
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Affiliation(s)
- N Xiang
- Department of Ophthalmology, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, China
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Hu WK, Gao XP, Geng MM, Gong ZX, Noréus D. Synthesis of CoOOH nanorods and application as coating materials of nickel hydroxide for high temperature Ni-MH cells. J Phys Chem B 2007; 109:5392-4. [PMID: 16851567 DOI: 10.1021/jp044514m] [Citation(s) in RCA: 85] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Studies on nanoscale materials have received great interest in both fundamental and applied aspects in recent years. In this letter, we report the synthesis of CoOOH nanorods and their possible applications as coating materials on nickel hydroxide for high-temperature nickel-metal hydride (Ni-MH) cells. The morphology and structure of CoOOH nanorods and coated nickel hydroxide particles are investigated by transmission electron microscopy, X-ray diffraction, and scanning electron microscopy, respectively. The electrochemical properties in the cylindrical AA size Ni-MH cells are evaluated. Our results show that the Ni-MH cells, where the positive electrodes are composed of such nanometer sized CoOOH coatings, have a higher capacity available and good performance at elevated temperatures of >50 degrees C.
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Affiliation(s)
- W K Hu
- Department of Structural Chemistry, Arrhenius Laboratory, Stockholm University, S-106 91 Stockholm, Sweden
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Chen X, Gao XP, Zhang H, Zhou Z, Hu WK, Pan GL, Zhu HY, Yan TY, Song DY. Preparation and Electrochemical Hydrogen Storage of Boron Nitride Nanotubes. J Phys Chem B 2005; 109:11525-9. [PMID: 16852412 DOI: 10.1021/jp050105u] [Citation(s) in RCA: 105] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Boron nitride (BN) nanotubes were synthesized through chemical vapor deposition over a wafer made by a LaNi5/B mixture and nickel powder at 1473 K. Scanning electron microscopy, transmission electron microscopy, energy-dispersive spectroscopy, X-ray diffraction, and X-ray photoelectron spectroscopy were performed to characterize the microstructure and composition of BN nanotubes. It was found that the obtained BN nanotubes were straight with a diameter of 30-50 nm and a length of up to several microns. We first verify that the BN nanotubes can storage hydrogen by means of an electrochemical method, though its capacity is low at present. The hydrogen desorption of nonelectrochemical recombination in cyclic voltammograms, which is considered as the slow reaction at BN nanotubes, suggests the possible existence of strong chemisorption of hydrogen, and it may lead to the lower discharge capacity of BN nanotubes. It is tentatively concluded that the improvement of the electrocatalytic activity by surface modification with metal or alloy would enhance the electrochemical hydrogen storage capacity of BN nanotubes.
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Affiliation(s)
- X Chen
- Institute of New Energy Material Chemistry, Department of Materials Chemistry, N & T Joint Academy, Nankai University, Tianjin 300071, China
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